Trane VUVE VUV Vertical Unit Ventilator Installation, Operation, and Maintenance Manual

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UV-SVN03_.book Page 1 Thursday, January 24, 2013 5:27 PM

Installation, Operation, and Maintenance

Vertical Unit Ventilator

Classroom Unit Ventilator—Model VUV

Models

VUVE

“A” and later Design Sequence

750 cfm—1500 cfm

SAFETY WARNING

Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are attached to the equipment.

January 2013

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Warnings, Cautions and Notices

Warnings, Cautions, and Notices.

Note that warnings, cautions, and notices appear at appropriate intervals throughout this manual. Warnings are provide to alert installing contractors to potential hazards that could result in death or personal injury. Cautions are designed to alert personnel to hazardous situations that could result in personal injury, while notices indicate a situation that could result in equipment or property-damage-only accidents.

Your personal safety and the proper operation of this machine depend upon the strict observance of these precautions.

Read this manual thoroughly before operating or servicing this unit.

ATTENTION: Warnings, Cautions, and Notices appear at appropriate sections throughout this literature. Read these carefully:

WARNING

CAUTION s

NOTICE:

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury. It could also be used to alert against unsafe practices.

Indicates a situation that could result in equipment or property-damage only

Important

Environmental Concerns!

Scientific research has shown that certain man-made chemicals can affect the earth’s naturally occurring stratospheric ozone layer when released to the atmosphere. In particular, several of the identified chemicals that may affect the ozone layer are refrigerants that contain Chlorine, Fluorine and Carbon (CFCs) and those containing Hydrogen, Chlorine, Fluorine and

Carbon (HCFCs). Not all refrigerants containing these compounds have the same potential impact to the environment. Trane advocates the responsible handling of all refrigerants-including industry replacements for CFCs such as HCFCs and HFCs.

Responsible Refrigerant Practices!

Trane believes that responsible refrigerant practices are important to the environment, our customers, and the air conditioning industry. All technicians who handle refrigerants must be certified. The Federal Clean Air Act

(Section 608) sets forth the requirements for handling, reclaiming, recovering and recycling of certain refrigerants and the equipment that is used in these service procedures. In addition, some states or municipalities may have additional requirements that must also be adhered to for responsible management of refrigerants. Know the applicable laws and follow them.

WARNING

Contains Refrigerant!

System contains oil and refrigerant under high pressure. Recover refrigerant to relieve pressure before opening the system. See unit nameplate for refrigerant type. Do not use non-approved refrigerants, refrigerant substitutes, or refrigerant additives.

Failure to follow proper procedures or the use of nonapproved refrigerants, refrigerant substitutes, or refrigerant additives could result in death or serious injury or equipment damage.

WARNING

Proper Field Wiring and Grounding

Required!

All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in

NEC and your local/state electrical codes. Failure to follow code could result in death or serious injury.

WARNING

Personal Protective Equipment (PPE)

Required!

Installing/servicing this unit could result in exposure to electrical, mechanical and chemical hazards.

• Before installing/servicing this unit, technicians

MUST put on all PPE required for the work being undertaken. ALWAYS refer to appropriate MSDS sheets and OSHA guidelines for proper PPE.

• When working with or around hazardous chemicals,

ALWAYS refer to the appropriate MSDS sheets and

OSHA guidelines for information on allowable personal exposure levels, proper respiratory protection and handling instructions.

• If there is a risk of arc or flash, technicians MUST put on all PPE in accordance with NFPA 70E or other country-specific requirements for arc flash protection, PRIOR to servicing the unit.

Failure to follow instructions could result in death or serious injury.

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WARNING

Hazard of Explosion and Deadly Gases!

Never solder, braze or weld on refrigerant lines or any unit components that are above atmospheric pressure or where refrigerant may be present. Always remove refrigerant by following the guidelines established by the EPA Federal Clean Air Act or other state or local codes as appropriate. After refrigerant removal, use dry nitrogen to bring system back to atmospheric pressure before opening system for repairs. Mixtures of refrigerants and air under pressure may become combustible in the presence of an ignition source leading to an explosion. Excessive heat from soldering, brazing or welding with refrigerant vapors present can form highly toxic gases and extremely corrosive acids.

Failure to follow all proper safe refrigerant handling practices could result in death or serious injury.

Introduction

Important: Equipment is shipped FOB (Free On Board) at the manufacturer. Therefore, freight claims for damages against the carrier must be initiated by the receiver.

Warnings, Cautions and Notices

Trademarks

ComfortLink, EarthWise, Rover, Tracer, Tracer Summit,

Trane, and the Trane logo are trademarks or registered trademarks of Trane in the United States and other countries. All trademarks referenced in this document are the trademarks of their respective owners.

BACnet is a registered trademark of American Society of

Heating, Refrigerating and Air-Conditioning Engineers

(ASHRAE); Echelon, LonTalk, and L

ORKS

are registered trademarks of Echelon Corporation; Energizer is a registered trademark of Eveready Battery Company, Inc.;

National Electrical Code, National Fire Protection

Association, and NEC are registered trademarks of the

National Fire Protection Association.

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Electrical Wiring . . . . . . . . . . . . . . . . . . . . .42

Electric Heat (Option) . . . . . . . . . . . . . . . . .43

DX System . . . . . . . . . . . . . . . . . . . . . . . . .43

Split System Start-Up . . . . . . . . . . . . . . . .43

ECM Overview and Setup

. . . . . . . . . . . . . . . .45

Overview

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

General Information

. . . . . . . . . . . . . . . . . . .45

Trane BLDC Motor . . . . . . . . . . . . . . . . . . .45

ECM Engine Controller . . . . . . . . . . . . . . .45

Standard Adapter Board . . . . . . . . . . . . . .46

CSTI Adapter Board . . . . . . . . . . . . . . . . . .46

Installation and Initial Setup

. . . . . . . . . . . .47

Installation and Initial Setup . . . . . . . . . . .47

Adjustment and Configuration of the Engine

Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

Status Display . . . . . . . . . . . . . . . . . . . . . . .50

Initial Setup and Configuration . . . . . . . . .55

Configuration

. . . . . . . . . . . . . . . . . . . . . . . . .55

Configuring the ECM Engine Controller . .55

Configuring the ECM Engine Board . . . . .60

Time Clock

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

Setting the Time Clock . . . . . . . . . . . . . . . .65

Wired Controllers—Communication Wiring

Wiring Installation (ZN520)

. . . . . . . . . . . . .67

Device Addressing . . . . . . . . . . . . . . . . . . .67

Wiring Installation (Tracer UC400)

. . . . . . .67

Wiring Overview Outline . . . . . . . . . . . . . .68

General Instructions . . . . . . . . . . . . . . . . . .68

BACnet MS/TP Link . . . . . . . . . . . . . . . . . .68

Power Supply . . . . . . . . . . . . . . . . . . . . . . .69

Pre-Start

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

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Pre-Start-up Checklist . . . . . . . . . . . . . . . 71

Startup

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Tracer ZN520 Unit Startup . . . . . . . . . . . . 72

Tracer UC400 Unit Startup . . . . . . . . . . . 72

General Information . . . . . . . . . . . . . . . . . 72

Fan Mode Switch Operation . . . . . . . . . . 72

Tracer ZN520 Operation . . . . . . . . . . . . . 72

UC400 Controller Operation . . . . . . . . . . 73

Tracer ZN520 Sequence of Operation

. . . 73

Cooling Operation (Tracer ZN520) . . . . . 74

Fan Mode Operation (Tracer ZN520) . . . 75

UC400 Sequence of Operation

. . . . . . . . . 80

Power-up Sequence (UC400) . . . . . . . . . 80

Random Start (UC400) . . . . . . . . . . . . . . . 80

Occupancy Modes (UC400) . . . . . . . . . . . 80

Timed Override Control (UC400) . . . . . . 81

Zone Temperature Control (UC400) . . . . 81

Discharge Air Tempering (UC400) . . . . . 82

Heating or Cooling Mode (UC400) . . . . . 82

Entering Water Temperature Sampling Function (UC400) . . . . . . . . . . . . . . . . . . . . . . . 82

Fan Operation (UC400) . . . . . . . . . . . . . . 82

Exhaust Control (UC400) . . . . . . . . . . . . . 83

Valve Operation (UC400) . . . . . . . . . . . . . 83

Modulating Outdoor/Return Air Damper

(UC400) . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Two-position Control Of A Modulating Outdoor Air Damper (UC400) . . . . . . . . . . . . 85

Electric Heat Operation (UC400) . . . . . . . 85

Dehumidification Operation (UC400) . . . 85

Peer-to-peer Communication (UC400) . . 85

Unit Protection Strategies (UC400) . . . . . 85

Maintenance

. . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Service Access . . . . . . . . . . . . . . . . . . . . . 87

Periodic Maintenance . . . . . . . . . . . . . . . 87

Preventive Maintenance . . . . . . . . . . . . . 89

Diagnostics

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Troubleshooting Checklist . . . . . . . . . . . . 90

Output Testing and Diagnostics (Tracer

ZN520)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Output Testing and Diagnostics (UC400)

. 95

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Output Testing (UC400) . . . . . . . . . . . . . . .95

Diagnostics (UC400) . . . . . . . . . . . . . . . . .95

Troubleshooting (Wireless Controls)

. . . . .96

Troubleshooting (Tracer ZN520) . . . . . . .102

Troubleshooting (UC400) . . . . . . . . . . . .103

Troubleshooting (ECM) . . . . . . . . . . . . . .105

General Information (ECM) . . . . . . . . . . .106

Troubleshooting Information (ECM) . . .106

Replacing ECM Components

. . . . . . . . . . . .108

Circuit Modules Replacement Notes/Work Instructions . . . . . . . . . . . . . . . . . . . . . . . . .109

Softsetting the IMC Address of an ECM Engine Module . . . . . . . . . . . . . . . . . . . . . . .110

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Vertical Unit

Ventilator Model

Number

Digits 1, 2, 3 — Unit

Configuration

VUV= Vertical Unit Ventilator

Digit 4 — Development

Sequence

Digits 5, 6, 7 — Nominal Airflow

075 = 750 cfm

100 = 1000 cfm

125 = 1250 cfm

150 = 1500 cfm

Digit 8 — Voltage (Volts/Hz/

Phase)

0 = 115/60/1

1 = 208/60/1

2 = 230/60/1

3 = 208/60/3

4 = 460/60/3

7 = 277/60/1

8 = 230/60/3

Digit 9 — Open Digit = 0

Digits 10, 11 — Current Design

Sequence

Digit 12 — Face & Bypass

Y = Yes, Include Damper

N = No Damper

Digit 13 — Unit Arrangement

1 = Return Air Front / Fresh Air Back

2 = 100% Return Air Front

3 = 100% Fresh Air Back

4 = Dynamic Air Barrier

5 = ERS-Compatible w/RH

Connection

6 = ERS-Compatible w/LH

Connection

Digit 14 — Preheat / Reheat /

Changeover

A = 4-Pipe Preheat (RH Clg/LH Htg)

B = 4-Pipe Preheat (LH Clg/RH Htg)

C = 4-Pipe Reheat (RH Clg/LH Htg)

D = 4-Pipe Reheat (LH Clg/RH Htg)

E = 2-Pipe (RH Connections)

F = 2-Pipe (LH Connections)

Digit 15 — Cooling / 2-Pipe Coil

0 = None

B = 2-Row, 12 F.P.I.

C = 2-Row, 16 F.P.I.

D = 3-Row, 12 F.P.I.

E = 3-Row, 16 F.P.I.

F = 4-Row, 12 F.P.I.

G = 4-Row, 14 F.P.I.

H = 3-Row, 16 F.P.I, EarthWise™ Coil

J = 3-Row, DX (R-410A) Cooling Coil

Model Number Descriptions

Digit 16 — Heating Coil

0 = None

A = 1-Row, 12 F.P.I.

B = 2-Row, 12 F.P.I.

C = 2-Row, 16 F.P.I.

D = 3-Row, 12 F.P.I.

E = 3-Row, 16 F.P.I.

F = 4-Row, 12 F.P.I.

G = 4-Row, 14 F.P.I.

H = 3-Row, 16 F.P.I, EarthWise Coil

K = Steam Low

L = Steam High

M = Electric Heat - Low

N = Electric Heat - Med

P = Electric Heat - High

Digit 17 — Motor

0 = ECM

1 = ECM & Low Acoustic Option

2 = ECM & Low FLA Option

3 = ECM & Low Acoustic & Low FLA

Option

Digit 18 — Other Motor Items

A = None

B = Toggle

C = Circuit Breaker

Digit 19 — 2- or 3-Way Valve -

Cooling Changeover Coil

0 = None

2 = 2-Way; 3-Point Floating

3 = 3-Way; 3-Point Floating

4 = 2-Way; 2–10 Volt

5 = 3-Way; 2–10 Volt

6 = Isolation Valve; 2-Way

7 = Isolation Valve; 3-Way

Digit 20 — CV - Cooling or

Changeover Coil

0 = None

L = Low Cv

M = Medium Cv

H = High Cv

Digit 21 — 2- or 3-Way Valve -

Preheat or Reheat Heating Coil

0 = None

2 = 2-Way; 3-Point Floating

3 = 3-Way; 3-Point Floating

4 = 2-Way; 2–10 Volt

5 = 3-Way; 2–10 Volt

6 = Isolation Valve; 2-Way

7 = Isolation Valve; 3-Way

Digit 22 — CV - Preheat or

Reheat Heating Coil

0 = None

L = Low Cv

M = Medium Cv

H = High Cv

Digit 23 — Discharge

Arrangement

0 = Opening Only, No Grille

A = Discharge Grille

B = Double Deflection Discharge

Grille

C = Grille Discharge with Wire Mesh

Digit 24 — Outside Air Damper

Control

0 = None

A = 3-Wire Actuator

B = 2–10 Volt Actuator

Digit 25 — Face and Bypass

Damper Control

0 = None

A = 3-Wire Actuator

B = 2–10 Volt Actuator

Digit 26 — Controls

0 = None, Unit-Mounted Speed

Switch

2 = Customer Supplied Terminal

Interface (CSTI)

3 = CSTI w/Low Temp Detection

4 = Tracer™ ZN520

5 = Tracer ZN520 w/Time Clock

6 = Tracer ZN520 w/Fan Status

8 = Tracer UC400 w/Time Clock

Digit 27 — Unit- or Wall-

Mounted Controls

0 = None

1 = Unit-Mounted

2 = Wall-Mounted

3 = Unit-Nounted Fan Speed

Switch & Wall-Mounted

Temperature Sensor

4 = Wireless Zone Sensor

Note: The wall-mounted room sensor is ordered as separate line item in

Job Configurator.

Digit 28 — Internal or External

Set Point

0 = None

1 = Internal

2 = External

3 = Digital Display

Digit 29 — Timed Override

0 = No

1 = Yes

Digit 30 — Exhaust Control

A = No Exhaust Control with

3-Speed Supply Fan

B = Exhaust Control with 2-Speed

Supply Fan

C = No Exhaust Control with 1-Speed

Supply Fan (DX/EH Units)

D = Exhaust Control with 1-Speed

Supply Fan (DX/EH Units)

Digit 31 — DDC Programming

0 = None

1 = Humidity Sensor Programming

2 = CO

Sensor Programming

Note: The humidity and CO

sensor must be ordered as a separate line item in Job Configurator.

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Model Number Descriptions

Digit 32 — Unit Depth

A = Standard (16-5/8 in.)

B = 21-1/4 in. Depth with Baffle

C = 21-1/4 in. Depth with Full Sheet

Metal Back and Baffle

D = 21-1/4 in. Depth with 25 in. High

Falseback

E = 21-1/4 in. Depth with 26 in. High

Falseback

F = 21-1/4 in. Depth with 27 in. High

Falseback

G = 21-1/4 in. Depth with 28 in. High

Falseback

H = 21-1/4 in. Depth with 29 in. High

Falseback

J = 21-1/4 in. Depth without Baffle

Note: Selection “J” should be applied if

OA opening is raised above standard baffle location.

Digit 33 — End Covers

0 = None

1 = 16-5/8 in. Depth without Cutouts

2 = 16-5/8 in. Depth with 3 x 7-1/4 in.

Cutout

4 = 21-1/4 in. Depth without Cutouts

5 = 21-1/4 in. Depth with 3 x 7-1/4 in.

Cutout

6 = 21-1/4 in. Depth with 3-1/4 in. x

16-7/8 in. Cutout

Digit 34 — Front Panel

1 = Standard Front Panel

2 = Heavy Gauge Front Panel

Digit 35 — Subbase

0 = No Subbase

2 = 2 in. Subbase

4 = 4 in. Subbase

6 = 6 in. Subbase

Digit 36 — Piping Package

0 = None

1 = Ball Valves & P/T Ports

2 = Ball Valve & Circuit-Setter with

P/T Ports

3 = Ball Valve, Circuit-Setter with

P/T Ports & Strainer

Digit 37 — Flow Control -

Cooling/Changeover Coil

0 = None

Digit 38 — Flow Controls -

Heating Coil

0 = None

Digit 39 — Auxiliary Drain Pan -

Piping

Y = Yes, Auxiliary Drain Pan

N = No Auxiliary Drain Pan

Digit 40 — Crossover Piping

0 = None

1 = Internal

2 = External 1-3/8 in. Crossover

Piping

3 = External 2-1/8 in. Crossover

Piping

Digit 41 — Filter

1 = Standard Throwaway Filter

2 = MERV 8 Filter

3 = MERV 13 Filter

Digit 42 — Color

1 = Deluxe Beige

2 = Cameo White

3 = Soft Dove

4 = Stone Gray

5 = Driftwood Gray

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General Information

Unit Description

Unit Nameplate.

The unit nameplate is located in the left hand end pocket, behind the control box. It includes the unit model number, serial number, electrical characteristics, and other pertinent unit data.

Factory Shipment.

Before shipment, each unit is leaktested and run-tested for proper control operation.

Access.

A three-panel front access of the unit ventilator allows for speedy set-up during field commissioning. This design allows for the end pocket of the unit ventilator to be open while the fan (airside) section stays closed.

End Pockets.

Access for piping and controls is made through the unit ventilator’s end pockets.

Coil Connections.

The coil headers and drain connections are made within the unit chassis to allow a tight seal and help prevent air leakage around the coil. The connection sizes vary dependent upon type of coil combination specified.

Coil type

Hydronic cooling (main) coil or

Heating/cooling changeover coil

Heating (auxiliary) coil

Steam heating coil

Direct expansion coil

Size (in.)

3/4 in. nominal

7/8 in. ID

1/2 in. nominal

5/8 in. ID

1 in. FNPT

3/8 in. OD liquid

7/8 in. OD suction

Unit Drain Pan.

The drain pan is dual-sloped for effective condensate removal. It is made from a noncorrosive material to help eliminate issues associated to leaking or standing water. It may be easily removed for cleaning. The drain pan connection size for all Trane VUVE models is 7/8 in. OD.

Motor.

Motors for the VUVE model do not include an external fan bearing on the end of the fan shaft. This helps avoid issues related to fan bearing maintenance (oiling is not needed), and/or bearing replacement.

Filters.

Filter sizing for the unit ventilator are an off-theshelf design to reduce or help eliminate local stocking of the filters. Options include throwaway filters, MERV 8, and

MERV 13 filters.

Sliding Fan Deck.

Convenient access to the fan motor and wheels for maintenance and serviceability may be made through Trane’s easy-slide fan deck design.

Note: Ground wire must be reconnected if removed for service of fan deck.

Outside-Air/Return-Air Dampers.

The outside-air/ return-air damper is a one piece, linkage free design resulting in a superior air-tight seal.

Options

**Field-Installed Controls (Option).**

The unit comes equipped with a fan speed switch, damper blade (only), and an optional low temperature detection.

Customer Supplied Terminal Interface (CSTI)

(Option).

Units containing the end device control design will incorporate a pre-wired, selected control components to a terminal strip for wiring a field-provided controller and temperature sensor.

Note: For controller operation malfunction of any non-

Trane, field installed controls, consult the literature or technical support of the controls manufacturer.

**Tracer ZN520 Control Package (Option).**

The Tracer

ZN520 electronic digital controller is a factory installed, tested and commissioned LonTalk ® certified design. It may be used in a stand-alone control scheme, or as part of a building automation system. The controller is pre-wired to Trane selected control components best suited for room comfort. For more information on the Tracer ZN520 unit controller operation and service issues, refer to

CNT-SVX04A-EN (Installation, Operation, and

Programming Guide: Tracer ZN520 Unit Controller), or the most recent version.

Tracer UC400 Control Package (Option).

The Tracer

UC400 electronic digital controller is a factory installed, tested and commissioned BACnet ® certified design. The

Tracer UC400 operates as a single zone VAV controller and ramps fan speed based on space load. It may be used in a stand-alone control scheme, or as part of a building automation system. The controller is mounted, pre-wired, and pre-programmed to selected control components best suited for room comfort. For more information on the

Tracer UC400 unit controller operation and service issues, refer to BAS-SVX48B-EN (Installation, Operation, and

Programming Manual: Tracer UC400 Programmable

Controller), or the most recent version.

OA/RA Actuator (Option).

The OA/RA actuator provides true spring-return operation for positive close-off of the OA/RA damper. The spring return system of the actuator closes the outside damper if power is lost to the building. When ordered with factory controls, the actuator is a 3-point floating design. A 2 to 10 Vdc actuator is available when other than Trane controls are specified.

Refer to

Table 1, p. 9

for OA/RA technical data.

Note: Because the damper actuator is a spring return type an inner spring will close the damper upon loss of power. If the need to service or replace the actuator is required, the spring must be “loaded” for the damper to function properly. The term loaded means that the blade must be held in the return air position upon replacement of the actuator.

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General Information

Face and Bypass Actuator (Option).

The face and bypass damper actuator incorporates a direct couple design. It provides electronic protection against overload.

A limit switch is not included, nor required as part of the design. When reaching the damper end position, the actuator automatically stops. The gears can be manually disengaged with a button on the housing. Refer to

Table 2, p. 9

for face and bypass actuator specifications.

Modulating Water Valves (Option).

The modulating control valve provides optimum control of hot and chilled water flow in various heating and cooling applications.

They are designed to provide sinusoidal valve actuator travel and operate silently, resisting water hammer.

The actuator on the valve is a 24V, 3-point floating type.

Refer to Table 3 for modulating water valve specifications.

Isolation Valve (Option).

The isolation valve is a two position 24V, spring return type valve. It provides added control in heating and cooling applications when used in conjunction with the face and bypass damper.

On heating coils, and two-pipe changeover applications, the valve is normally open to help prevent the coil from freezing in-case of power loss.

For cooling, the valve is normally closed and opens when

there is a call for cooling. Refer to Table 4, p. 9 for isolation

valve specifications.

Table 1.

OA/RA actuator specification

Table 2.

Face-bypass actuator specification

Power supply 24 Vac

20% 50/60 Hz

24 Vac

10%

Power consumption 2 W

Transformer sizing 3 VA (class 2-power source)

Angle of rotation Maximum 95-degree

Adjustable with mechanical stop

Torque 35 in./lb

Direction of rotation Reversible with switch L/R

Position indication

Manual override

Noise level

Control signal

Clip-on indicator

External push button

Less than 35 dB

3-point floating

Table 3.

Mod. water valve specification

Power supply 24 Vac ±20% 50/60 Hz

24 Vac ±10%

Power consumption Running: 2.5 W

Holding: 1 W

Transformer sizing 5 VA (class 2-power source)

Overload protection Electronic throughout 0° to 95° rotation

Control signal

Angle of rotation

2 to 10 Vdc

3-point floating with Trane controls

Maximum 95°

Adjustable with mechanical stop

Torque 35 in·lb

Direction of rotation Spring return reversible with cw/ccw mounting

Position indication

Noise level

Visual indicator, 0° to 95°

Running: 30 dB

Power supply

Power consumption

Max. duty cycle

24 Vac

4 W

15%

50/60 Hz

Operating ambient temp.

0 to 65°C

32 to 150°F

Min./max. fluid temp.

1 to 95°C

34 to 203°F

Operating pressure differential

Pressure rating

Max. - 4 bar (60 psi)

Flow characteristic

Static - 20 bar (300 psi)

Burst - 100 bar (1500 psi)

Linear

Table 4.

Isolation valve specification

Power supply

Power consumption

Max. fluid temp.

Min. fluid temp.

Max. operating pressure

Max. close-off pressure

24 Vac

50/60 Hz

5 W

94°C

200°F

1°C

34°F

300 psi

1/2 in. = 30 psi

3/4 in. = 20 psi

1 in. = 15 psi

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ECM Application Notes

The new Trane BLDC system has some notable differences to traditional designs.

RPM Mode

The motors are programmed from the factory to run in rpm mode and will not change rpm based on external static pressure, except at the performance limits of the motor/controller. For ducted units, the units are shipped with the rpm set for 0.2 in. ESP for High, Medium, and Low speeds. The speeds can for high, medium, and low operation, but should not be changed for the electric heat actuation speeds.

Generally, the fans deliver less cfm for the same rpm, if the static is increased and the power will decrease. The fan will deliver more cfm for the same rpm, if the static is decreased and the fan power will increase. A unit with high static configuration should not be used to free-deliver air

(i.e., with no ducting attached).

Field Power Wiring

Note: This product uses an electronic variable speed motor control, which includes a line reactor to minimize power line harmonic currents. It is recommended that good wiring practices be followed to manage building electrical power system harmonic voltages and currents to avoid electrical system problems or other equipment interaction.

Performance Boundaries

While the speeds of the fan motors can be adjusted, never program a fan speed higher than 1700 rpm, or lower than

450 rpm. In many cases, units configured for high-static operation will not achieve the desired rpm if the ESP of the unit is too low, or the unit is allowed to “free-discharge.”

The ECM engine contains settings that will limit the output power of the motor under these overload conditions. If the motors cannot achieve rpm close to the target for a specific period of time, the unit will disable electric heat and fanstatus indicators.

MCA/MFS and Power Draw

The Trane BLDC motors have variable output but are shipped at specific settings to deliver proper performance and reliability. The power draw indicated in the catalogue indicates the power consumed when applied properly (as shipped and with the nominal ESP applied). However, the nameplate of the unit indicates the maximum input draw of the motor, as the motor settings can be changed to draw more power.

Electric Heat Relays

For quiet operation, the new BLDC units employ power relays instead of definite purpose contactors for electric heat actuation. The coils of multiple relays are hooked in parallel to simulate a multi-pole contactor, as shown in

Figure 1 . In Figure 1 , two sets of three relays are used to

10 perform the function of a two 3-pole contactors.

Figure 1.

Sample arrangement: electric heat relay

Troubleshooting Other Unit Functions

In some cases, the normal or abnormal operation of the

BLDC system may interact with other components in the system. Generally, verification of the engine and adapter boards’ wiring and configuration should be checked if there are unexplained abnormalities in other areas of the unit:

Valve operation

2. Electric Heat operation

3. Changeover sensor operation

4. Damper operation

5. Condensate overflow switch

A high degree of protection is provided on electric heat units. If electric heat fails to actuate, it may be because of one of the following events:

Fans are failing to meet target speed. If a second motor is not present, all settings for speeds for Motor 2 should be set to 0000.

2. Hot water may be available in the changeover coil.

3. The connection to analogue input 1 on the Tracer ZN controller may be reversed in polarity.

4. Target speeds for motors may be set too high: a. The



parameter may be set incorrectly.

b. The



parameter may be set incorrectly.

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Dimensions and Weights

Unit Location and Clearances

Locate the unit in an indoor area. The ambient temperature surrounding the unit must not be less than

45°F. Do not locate the unit in areas subject to freezing.

NOTICE:

Equipment Damage!

Do not locate the unit in areas subject to freezing. Pipes could burst at lower temperature resulting in equipment damage.

Attention should be given to service clearance and technician safety. The unit should contain enough space for service personnel to perform maintenance or repair.

Provide sufficient room to make water, and electrical connection(s).

Table 5.

VUVE general data

Description

Unit length w/o end covers (in.)

Unit depth - standard (in.)

Unit depth - with false back (in.)

Unit height - standard (in.)

Shipping weight (lb)

Nominal filter size (in.) and quantity

0750

16-5/8

21-1/4

320

14 x 20 x 1 (2)

Dynamic air filter nominal size (in.) and quantity 7 x 42 x 1 (1)

Drain connection size (in.) 7/8 I.D. hose

Fan type / quantity

Motor data

FC / 2

Quantity 1

Horsepower (each) 1/4

Coil volume (gal)

Coil type A 0.178

B 0.311

C 0.311

D 0.444

E 0.444

F 0.610

G 0.610

H 0.395

Table 6.

Control Methodology

FSS

CSTI

Fan Speed

3 or infinite (a)

ZN520 3

UC400 Infinite

(a) With a field-supplied 2–10 Vdc controller.

WARNING

Electrocution and Fire Hazards with

Improperly Installed and Grounded Field

Wiring!

Improperly installed and grounded field wiring poses

FIRE & ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/state electrical codes. All field wiring MUST be performed by qualified personnel.

Failure to follow these requirements could result in death or serious injury.

A 36-inch clearance at the unit front is sufficient for maintenance and service of the equipment.

1/4

0.228

0.410

0.571

0.809

0.593

1000

16-5/8

21-1/4

405

14 x 24 x 1 (1)

14 x 30 x 1 (1)

7 x 54 x 1 (1)

7/8 I.D. hose

FC / 2

Unit size

1250

16-5/8

21-1/4

450

14 x 20 x 1 (2)

14 x 24 x 1 (1)

7 x 66 x 1 (1)

7/8 I.D. hose

FC / 4

1/4

0.277

0.510

0.704

1.014

0.742

Table 7.

Control Sequences

Fan Speeds

DX operation (a)

Electric heat operation

Sidewall Exhaust

ERSA (b)

(b)

(a)

(a) Fan speed during sequence operation.

(b) Unit Ventilator when operating with option.

1/4

0.327

0.610

0.931

1.213

0.837

1500

105

16-5/8

21-1/4

470

14 x 24 x 1 (2)

14 x 30 x 1 (1)

7 x 78 x 1 (1)

7/8 I.D. hose

FC / 4

UV-SVN03F-EN 11

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Dimensions and Weights

Figure 2.

Standard depth unit

(4)K.O. FOR PIPING

OR ELECTRICAL

5 3/4"

22 5/8"

12 1/2"

2 1/4" 9"

13 1/2"

FRESH AIR OPENING

(OPTIONAL)

BACK VIEW

(2)9" x 9"[229mm x 229mm]

KNOCKOUTS IN BOTTOM

16 5/8"

2 1/4"

13"

TOP VIEW

GRILLE

UNIT MOUNTED

FAN SWITCH

(OPTIONAL)

16 5/8"

2 3/8"

7/8" O.D.

DRAIN CONN.

8 1/8"

12 1/4"

3 3/4"

5 1/4"

3/4"

11"

14 3/8"

SIDE VIEW

PIPE

CHASE

30"

7/8" O.D.

AUX.

DRAIN CONN.

(optional)

2 1/2"

2 1/4"

3 3/4"

10 7/8"

RETURN AIR

(OPTIONAL)

FRONT OF UNIT

UNIT SIZE NO. FANS

075

100

125

150

69"

81"

93"

105"

42"

54"

66"

78"

NOTE:

1. THE UNIT LENGTH DOES NOT INCLUDE 5/8" END PANELS.

2. THE POWER CONNECTION IS MADE IN THE LEFT HAND

END POCKET FOR ALL OPTIONS BUT ELECTRIC HEAT.

3. THE POWER CONNECTION FOR ELECTRIC HEAT OPTION

IS MADE IN THE RIGHT HAND END POCKET.

12 UV-SVN03F-EN

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Dimensions and Weights

Figure 3.

Falseback unit

22 5/8"

12 1/2"

5 3/4"

2 1/4" 9"

13 1/2"

13"

2 1/4"

TOP VIEW

STEP-DOWN

FALSEBACK

21 1/4"

16 5/8"

2 3/8"

(4)K.O. FOR PIPING

OR ELECTRICAL

7/8" O.D.

DRAIN CONN.

7/8" O.D.

AUX.

DRAIN CONN.

(optional)

FRESH AIR OPENING

(OPTIONAL)

BACK VIEW

(2)9" x 9"[229mm x 229mm]

KNOCKOUTS IN BOTTOM

FALSEBACK

3 3/4"

8 1/8"

12 1/4"

3/4"

STEP-DOWN

IS IN 1"

INCREMENTS

11"

14 3/8"

SIDE VIEW

21 1/4"

16 5/8"

2 3/8"

2 1/4"

FALSEBACK

FRONT OF UNIT

RETURN AIR

(OPTIONAL)

3 3/4"

18"

10 7/8"

2 1/2"

14 3/8"

SIDE VIEW

Depicting Step-down

Falseback

2 1/4"

UNIT SIZE NO. FANS A B C

69" 42" 25" to 29" 075

100

2 81" 54" 25" to 29"

125

150

93"

105"

66"

78"

25" to 29"

30"

STEP-DOWN

FALSEBACK

FOR RETROFIT

APPLICATIONS

WHERE WINDOW

SEAL MAY INTERFERE

WITH UNIT INSTALLATION

(OPTIONAL)

NOTE:

1. THE UNIT LENGTH DOES NOT INCLUDE 5/8" END PANELS.

2. THE POWER CONNECTION IS MADE IN THE LEFT HAND

END POCKET FOR ALL OPTIONS BUT ELECTRIC HEAT.

3. THE POWER CONNECTION FOR ELECTRIC HEAT OPTION

IS MADE IN THE RIGHT HAND END POCKET.

4. THE UNIT SHOWN INCLUDES THE INSULATED HORIZONTAL

BAFFLE OPTION.

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Dimensions and Weights

Figure 4.

Dynamic air barrier unit

(4)K.O. FOR PIPING

OR ELECTRICAL

22 5/8"

12 1/2"

5 3/4"

2 1/4"

13 1/2"

RETURN AIR OPENING

FRESH AIR OPENING

BACK VIEW

(2)9" x 9"[229mm x 229mm]

KNOCKOUTS IN BOTTOM

2 1/4"

FALSEBACK

21 1/4"

16 5/8"

7/8" O.D.

DRAIN CONN.

PIPE

7/8" O.D.

AUX.

DRAIN CONN.

(optional)

8 1/8"

12 1/4"

3 3/4"

3/4"

5 1/4"

11"

14 3/8"

SIDE VIEW

2 1/4"

3 3/4"

10 7/8"

13"

FALSEBACK

TOP VIEW

UNIT SIZE NO. FANS

075

100

125

150

69"

81"

93"

105"

42"

54"

66"

78"

NOTE:

1. THE UNIT LENGTH DOES NOT INCLUDE 5/8" END PANELS.

2. THE POWER CONNECTION IS MADE IN THE LEFT HAND

END POCKET FOR ALL OPTIONS BUT ELECTRIC HEAT.

3. THE POWER CONNECTION FOR ELECTRIC HEAT OPTION

IS MADE IN THE RIGHT HAND END POCKET.

BARRIER

14 UV-SVN03F-EN

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Figure 5.

End covers

Dimensions and Weights

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Dimensions and Weights

Figure 6.

Wall boxes

16 UV-SVN03F-EN

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Figure 7.

Crossover piping

16 5/8" DEPTH UNIT

FLUSH

21 1/4" DEPTH UNIT

FLUSH

TOP VIEW

Note: 1-3/8 in. OD and 2-1/8 in. ID crossover piping

Crossover piping is available for all 2- or 4-pipe coils selections. Trane provides the crossover for the hot water only. The crossover pipe is factory insulated with

3/8 in.-thick insulation.

2. Expansion compensation between the factory piping package and the crossover piping is achieved using a flex hose rated at 250 psi working pressure. Flex hose is only available with factory mounted piping packages.

3. Expansion compensation for the crossover piping must be handled external to the unit ventilator.

4. Crossover connections terminate in the same end pocket as the heating coil on all 2- and 4-pipe coils.

Dimensions and Weights

S R

7/8" I.D. FIELD

CONN. W/ SHUT

OFF VALVE

1 1/2"

3 1/2"

4 1/2"

RETURN

SUPPLY

19 3/8"

24"

SIDE VIEW

3 5/8"

5 3/8"

S R

7/8" I.D. FIELD

CONN. W/ SHUT

OFF VALVE

1 1/4"

RETURN

SUPPLY

19 3/8"

24"

3 1/2"

4 1/2"

8 1/4"

10"

SIDE VIEW

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Receiving and Handling

The unit ventilator is packaged in clear stretch wrap and protective cardboard.

Note: Before unwrapping, make a visual inspection of the unit for any damage that may have occurred during shipping. All orders are shipped FOB (Freight on

Board) from the factory, therefore any claims must be made with the delivering carrier.

Following visual inspection, carefully begin the following procedures:

Carefully remove the stretch wrap and the top cardboard cover.

2. Remove remaining cardboard blocking.

3. Remove the bottom access panel with a 7/32-in. Allen wrench.

4. Verify nameplate sales order number is correct.

5. Remove shipping bracket from the lower rear corners of the unit and shipping skid. Access to the screws holding unit to the skid is obtained inside the unit.

Figure 8.

Shipping skid removal

6. Rotate fan wheels manually. Wheels should move freely and be in proper alignment. Visually inspect the fan area for obstructions or shipping damage.

Remove all applicable knock-outs for coil piping and electrical connections (see

Figure 2, p. 12 through

Figure 4, p. 14 ).

18 UV-SVN03F-EN

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Pre-Installation

Jobsite Inspection

Always perform the following checks before accepting a unit:

Verify that the nameplate data matches the data on the sales order and bill of lading (including electrical data).

2. Verify that the power supply complies with the unit nameplate specifications.

3. Visually inspect the exterior of the unit, for signs of shipping damage. Do not sign the bill of lading accepting the unit(s) until inspection has been completed. Check for damage promptly after the unit(s) are unloaded. Once the bill of lading is signed at the jobsite, the unit(s) are now the property of the

SOLD TO party and future freight claims MAY NOT be accepted by the freight company.

Jobsite Storage

This unit is intended for indoor use only. To protect the unit from damage due to the elements, and to prevent possible

IAQ contaminant sources from growing.

Place the unit(s) on a dry surface or raise above the ground to assure adequate air circulation beneath the unit.

2. Cover the unit(s) with a water proof tarp to protect them from the elements.

NOTICE:

Microbial Growth!

Wet interior unit insulation can become an amplification site for microbial growth (mold), which may cause odors and damage to the equipment and building materials. If there is evidence of microbial growth on the interior insulation, the insulation should be removed and replaced prior to operating the system.

3. Make provisions for continuous venting of the covered units to prevent moisture from standing on the unit(s) surfaces.

4. Do not stack units.

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Installation—Mechanical

Wall Box Installation

The following instructions are general recommendations for installing wall intake boxes. Consult the architectural plans for specific requirements.

Additional materials required to complete any specific installations (such as duct connections, metal mounting plates, or flanges) are not furnished by Trane.

For best results, all air intake boxes should be removable from outside of the building. Weep holes must be at the bottom to permit free drainage. A positive air and moisture seal should be provided around all edges.

General Instructions.

Trane wall boxes are illustrated in the dimensional section of this manual. Dimensions are actual, and may be used to define the wall opening.

Vertical louvers in the wall intake box provide extra strength for a high load bearing capacity. The lintel may be omitted on masonry wall installations.

Weep holes are provided in the outside face of the bottom channel in the wallbox frame. Install all wall boxes to permit free drainage through the weep holes to the outside of the building.

All wallboxes are furnished with diamond pattern expanded aluminum bird screen.

Note: V1 and V2 (vertical) wall models are all unflanged.

H2, V3, and V6 are flanged.

Installation in Masonry Walls.

A typical method of installing the wall box in a masonry wall opening is shown in

Figure 9

Grout the top and bottom of the wall box frame as noted.

A sloped water dam located in the space between the unit and wall facilitates moisture drainage. Grouting at the ends of the intake box will complete the seal between the wall box frame and the masonry opening.

Installation in Curtain Walls.

In all cases, the wall intake box should be caulked to provide a tight, weatherproof seal (see

Figure 10 ).

Note: A minimum of 2-1/8 in. of clearance must be maintained between the exterior wall and back of the unit. Failure to provide this gap will not allow the wall box to fit properly.

Figure 9.

Masonry wall installation

Interior Wall w/ sheetrock

Outside

Wall

Unit

Weep

Holes

Water dam sloped toward exterior

Figure 10.

Flanged wall box installation in 2-in. curtain wall

Interior Wall w/ sheetrock

Outside

Wall Unit

Caulking

Rubber

Seals

Flanged wallbox

Weep

Holes

Grout

Rubber

Seals

Floor

Water dam sloped toward exterior

General Installation Checks

The checklist below is a summary of the steps required to successfully install a unit. This checklist is intended to acquaint the installing personnel with procedures required in the installation process. It does not replace the detailed instructions called out in the applicable sections of this manual.

Carefully remove the stretch wrap and top cardboard cover. Check the unit for shipping damage and material shortage; file a freight claim and notify appropriate sales representation. If end panels have been ordered,

the panel will already be mounted to the unit.

Note: The unit ventilator is packaged in clear stretch wrap to allow for immediate visual inspection.

A protective cardboard cover helps prevent scratching and other cosmetic blemishes during transport.

2. Remove remaining cardboard blocking.

3. Remove the unit’s left front panel to verify nameplate/ sales order number is correct. It is located behind the control box.

UV-SVN03F-EN

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4. Remove shipping bracket from the lower rear corners of the unit to separate the unit from the skid. Access to the screws holding the bracket to the skid is obtained inside the unit.

5. Rotate the fan wheels manually. The wheels should move freely and be in proper alignment. Visually inspect the fan area for obstructions or shipping damage.

6. Remove all applicable knockouts for coil piping and electrical connections.

Location Considerations

Selecting the appropriate location for installing a unit is very important. The following factors should be considered:

WARNING

Heavy Object!

Floor structure must be strong enough to support the weight of the unit. Consult the structural plans, and have a structural engineer ensure the floor can withstand the weight of the unit. Inadequate structural support could result in unit falling.

Failure to follow recommendations could result in death or serious injury.

Floor design must have sufficient structure to withstand the weight of the unit while allowing for openings in the floor for a return air duct, electrical and piping supply lines fed through the floor. Refer to

“Dimensions and Weights,” p. 11 for unit weights.

2. Wall space design should allow the unit to be mounted to the wall securely. The wall surface behind the unit should be smooth and level. Wall and floor moldings should be removed prior to installation. A wall slightly out of level may cause problems with unconditioned air leaking into the room. Remove any object projecting more then 1/8 in. (0.3175 cm) from the wall surface.

Note: Additional gasket or furr strips may be installed to accommodate for an uneven wall.

3. There are two removable knock-outs in the rear of the unit, on either end, for piping and electrical supply lines. A pipe chase is located in the upper back portion of the unit for crossover piping. The outside air opening is located in the lower back of the unit and the path to the wallbox on the outside wall should be unobstructed.

4. The physical layout of the room should accommodate any accessories ordered with the unit. Conditioned air is distributed through the grille on top of the unit and returned through the return air grille on the bottom of the unit. Avoid placing any objects that may obstruct either grille or interfere with airflow.

Installation—Mechanical

5. Internal access to the unit is provided by the removable front panel. Sufficient space should be allowed to lift the panel for maintenance purposes.

6. Ensure the floor surface is level.

Note: The unit leveling legs can be adjusted to accommodate slight out-of-level installation surfaces.

Unit Mounting

Note: All wall intake boxes should be installed prior to

mounting the unit ventilator. Refer to p. 20

for wall box installation instructions.

The 1/2 in. mounting or anchoring holes are located on the

back of the unit on each end (see Figure 11, p. 22 ).

Note: All mounting fasteners are to be provided by the installer.

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Installation—Mechanical

Figure 11.

Mounting hole location

E F

A D

075

100

125

150

Standard unit (no falseback)

Standard falseback

29 in. stepdown falseback

28 in. stepdown falseback

27 in. stepdown falseback

26 in. stepdown falseback

25 in. stepdown falseback

Standard unit (no falseback)

Standard falseback

29 in. stepdown falseback

28 in. stepdown falseback

27 in. stepdown falseback

26 in. stepdown falseback

25 in. stepdown falseback

Standard unit (no falseback)

Standard falseback

29 in. stepdown falseback

28 in. stepdown falseback

27 in. stepdown falseback

26 in. stepdown falseback

25 in. stepdown falseback

Standard unit (no falseback)

Standard falseback

29 in. stepdown falseback

28 in. stepdown falseback

27 in. stepdown falseback

26 in. stepdown falseback

25 in. stepdown falseback

WARNING

Improper Unit Lift!

13.50

2.13

13.50

2.13

13.50

2.13

13.50

2.13

1.31

1.00

1.31

1.00

1.31

1.00

1.31

1.00

Test lift unit approximately 24 inches to verify proper center of gravity lift point. To avoid dropping of unit, reposition lifting point if unit is not level. Failure to properly lift unit could result in death or serious injury or possible equipment or property-only damage.

Set the unit into selected location and adjust leveling legs if necessary to ensure level fit.

Note: Care should be taken when handling the unit to ensure that the front return air grille does not bend.

8. Push the unit tightly against the wall to compress the seal on the back edge of the unit and intake opening.

Anchor the unit by using the 1/2 in. mounting holes in both end pockets.

Units containing a falseback: The falseback unit ventilator contains mounting holes located on the

2.75

26.00

24.44

23.44

22.44

21.44

20.44

2.75

26.00

24.44

23.44

22.44

21.44

20.44

2.75

26.00

24.44

23.44

22.44

21.44

20.44

2.75

26.00

24.44

23.44

22.44

21.44

20.44

66.39

67.00

78.39

79.00

90.39

91.00

102.39

103.00

10.38

10.00

10.38

10.00

10.38

10.00

10.38

10.00

45.64

47.00

57.64

59.00

69.64

71.00

81.64

83.00

falseback metal. Use these holes rather than the holes located in the unit’s end pockets.

Note: Ensure the unit is level. Coils and drain pans inside the unit are pitched properly for draining before shipment.

9. Ensure the unit rests tightly against the wall. Check for proper seal and that air does not leak underneath the unit.

Subbase (Option)

A subbase may be used to increase the unit height and aid in leveling the unit. The subbase is shipped separately for field installation. Slots and leveling screws are provided on the subbase.

Remove the leveling legs provided with the unit (see

Figure 12

22 UV-SVN03F-EN

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Figure 12.

Subbase with leveling legs

Unit Base

Weld

Nuts

2"- 6"

Subbase

For leveling legs

2. Set the unit on the subbase and fasten with four, 3/8 in. x 16 ft x 1 in. hex head cap screws and 3/8 in. lock washers.

Note: Hex screws and lock washers are provided by the factory. They are located in a baggy and are used to attach the base to the unit ventilator.

Pre-drilled slots in the subbase flange will line up with the weld nuts in the bottom of the unit.

3. The bottom of the subbase has weld nuts in four slots.

Place the leveling legs in those slots and level the unit.

End Panels

When ordered as an option, end covers ship already attached to the vertical unit ventilator. The following section is for installing end covers purchased as an addon.

It is recommended end panels be installed on the unit ventilator after all piping, wiring and accessory installation is completed. To install the end panel:

Insert the four factory provided metal studs into the four pre-mounted nuts on the inside of the panel.

2. Align each stud with the four pre-drilled holes on the side of the unit.

3. Secure the panel to the unit by fastening with the four factory provided nuts.

4. Do not overtighten screws.

NOTICE:

Equipment Damage!

Do not run units for any length of time without all panels and filters properly installed. Failure to do so could result in equipment failure.

Installation—Mechanical

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Installation—Piping

Piping Installation

Before installation of piping package, the shipping bracket holding the piping in place, must be removed.

Proper installation of piping is necessary to provide efficient coil operation and to prevent damage during operation. Follow standard piping practices and include all accessories as necessary.

Piping connection knockouts are shown in “Dimensions and Weights,” p. 11

. Field connection types and sizes for

unit coils are listed in Table 8

. These sizes are provided for field piping connection.

Table 8.

Coil data for field piping

Coil type

4-pipe chilled water / hot water

Connection location

Left or right (opposite ends)

2-pipe changeover coil Left or right

Field connection size

7/8 in. OD / 5/8 in. OD

7/8 in. OD

Hot water only

Steam

Left or right

Chilled water / electric heat

Left cooling

7/8 in. OD

1 in. MPT

7/8 in. OD

Chilled water / steam Left or right

DX Left

DX / hot water

DX / steam

DX / electric heat

Left cooling / right heating

7/8 in. OD / 1 in. MPT

7/8 in. suction, 3/8 in.

7/8 in. suction,

3/8 in. / 5/8 in. OD

7/8 in. suction,

3/8 in. / 1 in. MPT

7/8 in. suction,

3/8 in. / NA

A 7/8 in. OD condensate drain connection is provided on the chilled water supply end of the unit.

Attach a flexible condensate drain hose over the drain pan connection and secure with a hose clamp.

The drain pan on the vertical is vacuum-molded with a drain connection and P-trap on the cooling coil, connection side.

Note: Condensate removal to the main system should be made through the bottom of the unit ventilator. If other location for condensate removal is desired, a specific field cut-out for the connection should be made in the back of the unit ventilator. To help avoid cold air infiltration, the field cut-out should only be large enough to allow for the condensate hose to exit the unit.

To field reverse the slope of a vertical unit drain pan:

2. Slide out fan deck (disconnecting the condensate line

and fan plug will release fan deck for sliding).

3. Remove pipe clamp that hold the p-trap to the drain pan.

4. Remove clips that hold the drain pan in-place.

5. Lift and rotate the drain pan.

6. Reconnect p-trap to the drain pan and replace clips to secure the pan to the fan deck.

After the condensate drain piping has been completed, check water flow to ensure the system properly carries and away all condensate accumulation.

Note: A P-trap is factory supplied in every vertical unit ventilator.

**Trane Piping Packages (Option).**

Trane Standard

Piping Package includes a 2- or 3-way valve with bypass balance valve, ball valves, Pete’s plugs and unions. A strainer and circuit balancing valve are optional.

All union connections should be tightened in the field.

Units are shipped with union connections hand tightened only in the factory.

Note: All connections made in the field should be sweat connections.

Piping packages are not shipped insulated. Any insulation should be provided in the field by the installing contractor.

The auxiliary drain pan (optional) is the main condensate connection to the unit when specified. The chilled water or

DX coil drain pan will empty into the auxiliary drain pan if a factory-installed, auxiliary pan is ordered. All field-piping condensate connections should be made at the auxiliary drain pan.

Installation Crossover Piping

Crossover piping is available for all hydronic coils. It is either 1-3/8 in. \[34.9\] or 2-1/8 in. \[54\] in diameter (OD) as specified by the customer. Crossover piping can be found in either the left or right hand end pocket. Refer to

“Dimensions and Weights,” p. 11

for dimensional data.

On 4-pipe coils, crossover piping connects to the main cooling coil.

Factory insulation is provided on all crossover piping.

When a Trane piping package is ordered, it is installed with the connections made to the supply and return of both the coil and the crossover piping. However, supply and return connections must be made in the field when a piping package is furnished by the installer.

The crossover piping is located at the back of the unit along the wall and the ends of the piping are flush with the end of the unit.

Expansion compensation between the piping package and the crossover piping is achieved using flex hoses rated at

250 psi working pressure. Expansion compensation for the crossover piping must be handled external to the unit ventilator.

Split System Units

The following refrigerant piping and interconnecting wiring instructions apply to unit ventilators with direct expansion type cooling coils used in conjunction with aircooled condensing units. Reference must also be made to

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Note: The ETL listing mark applied to a unit ventilator does not apply to any associated refrigerant condensing unit.

Refrigerant Piping

Installation—Piping

There are detailed methods for determining condensate load under various operating conditions. However, in most cases this is not necessary if the coils are piped as shown in

Figure 13

. Follow the procedure documented in the ASHRAE Systems Handbook, Steam Systems.

Figure 13.

Steam piping

Temp. Regulating Valve

WARNING

Hazard of Explosion and Deadly Gases!

Failure to follow all proper safe refrigerant handling practices could result in death or serious injury.

Unit ventilators with direct expansion cooling contain a nitrogen holding charge in the evaporator coils.

Connections are “pinched-off” at the factory.

To connect the condensing unit lines, cut off the stubouts and swage. The condensing unit lines can then be brought into the swage and brazed. Trane recommends the use of nitrogen purge when brazing refrigerant lines to prevent formation of oxides in the lines.

Install the refrigerant suction and liquid lines as described in the condensing unit installation instructions. The TXV is factory installed on the unit ventilator. Piping should be run straight out through the back of the unit. Access piping knockouts are located in the rear panels of the unit, as

shown “Dimensions and Weights,” p. 11 .

Recommended refrigerant line connections for various

unit combinations are given in Table 8, p. 24

. Typical

Superheat Charging Charts are shown in the Trane Service

Facts found in the condensing unit section manual.

Refrigerant charge weights can also be determined with your local Trane sales engineer using a valid Trane

Selection Program.

Steam Piping

When air, water or another product is heated, the temperature or heat transfer rate can be regulated by a modulating steam pressure control valve. Since pressure and temperature do not vary at the same rate as load, the steam trap capacity, which is determined by the pressure differential between the trap inlet and outlet, may be adequate at full load, but not some lesser load.

Coil

To Condensate return H= 12" minimum

Vacuum Equalizer

F&T Trap

See text for sizing

Gravity flow to vented receiver

Modulating Water Valves (Option)

The actuator on the valve is a 24V, 3-point floating valve.

The actuator can be easily removed from the valve body by pressing in on the locking tab and rotating the actuator

45° counter-clockwise (see Figure 14

). The 2-way valves are bi-directional flow; the 3-way valves can be mixing or

diverting (see Figure 15, p. 26 ).

Note: The actuator must be removed if soldering is being conducted near the valve. High heat may cause damage to the actuator’s plastic body/ mechanisms.

Figure 14.

Remove modulating valve actuator by pressing in tab (inset) and turning actuator

45° counterclockwise

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Installation—Piping

Figure 15.

Steam piping: 2- and 3-way valves

2-way valve 3-way valve

Closed AB<->B

Open

AB<->A

Plumbing the Valve

The valve may be plumbed in any angle but preferably not with the actuator below horizontal level of the body. Make sure there is enough room around the actuator for servicing or replacement.

For use in diverting applications, the valve is installed with the flow water entering through the bottom AB port and diverting through end ports A or B. In mixing applications the valve is installed with inlet to A or B and outlet through

AB.

Mount directly to the tube or pipe. Do not grip the actuator while making or tightening plumbing connections. Either hold valve body by hand or attach an adjustable spanner

(38 mm/1-1/2”) across the hexagonal or flat faces on the

valve body (see Figure 17

Figure 17.

Proper plumbing technique for modulating valves

On applications without the optional, factory installed piping packages, it is important to remove the cartridge assembly from the valve body with the provided tool (see

Figure 16 ).

Figure 16.

Cartridge removal tool

Use the following steps to complete cartridge assembly removal:

Remove valve actuator.

2. Remove the cartridge assembly from the valve body with the enclosed tool.

3. Solder the valve in accordance with normal soldering practices.

4. Re-install the cartridge after soldering by tightening until it bottoms out. The top surface of the cartridge will be flush with the top edge of the body casting.

NOTICE:

Over-tightening!

Do not over-tighten. Maximum torque is 40 in·lb.

Overtightening could result in equipment damage.

5. Replace valve actuator and wire in accordance with instructions.

Manually Opening Valve

The manual opener can be manipulated only when in the up position. The A port can be manually opened by firmly pushing the white manual lever down to the midway position and pushing the lever in. In this position, both A and B ports are open. This “manual open” position may be used for filling, venting and draining the system or opening the valve during power failure.

The valve can be closed by depressing the white lever lightly and then pulling the lever outward. The valve and actuator will return to the automatic position when power is restored.

Note: If the valve is powered open, it cannot be manually closed, unless the actuator is removed.

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Wiring the Valve

WARNING

Electrocution and Fire Hazards with

Improperly Installed and Grounded

Field Wiring!

Improperly installed and grounded field wiring poses

Failure to follow these requirements could result in death or serious injury.

A controller and a separate transformer is required to operate each valve (see

Figure 18 and Figure 19, p. 27

Port A “open” and “closed” denote valve open and closed positions.

Figure 18.

Wiring for modulating valve actuator

Figure 19.

Wiring for modulating valve actuator

Installation—Piping

enough room to remove actuator cover for servicing.

Mount the valve on the tube or pipe.

Note: Ensure the flow through the valve is in the direction indicated by the arrow stamped on the valve body.

Figure 20.

Proper mounting for isolation valves

Servicing/Removal of Valves

The actuator can be removed from the valve body.

Removing the actuator is recommended if soldering is being conducted near the valve. To remove the actuator:

Place the manual operating lever to the Open position

(see Figure 21, p. 27 ).

2. Depress the locking button and lift actuator until it separates from the valve body.

To install the actuator to the valve body:

3. Align the slot on the shaft of the valve with the valve

body notch on side of body (see Figure 22, p. 28

Figure 21.

Removing valve actuator

The typical floating controller is an SPDT controller with a center-off position. On a change in temperature from the set point, the controller will close the normally open (NO) or normally closed (NC) contacts, driving the valve to an intermediate position until a further change at the controller.

The valve is set between the limits of the controller to satisfy various load requirements. In the event of power failure, the valve will stay in the position it was in before loss of power. When power is restored, the valve will again respond to controller demand.

Isolation Valves Installation

The valve can be mounted in any position on a vertical line.

If the valve is mounted horizontally, the actuator must be even with or above the center line. Make sure there is

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Installation—Piping

Figure 22.

Installing isolation valve

Figure 23.

Preparation for soldering

4. Install body valve into pipe.

WARNING

Electrocution and Fire Hazards with

Improperly Installed and Grounded Field

Wiring!

Improperly installed and grounded field wiring poses

Failure to follow these requirements could result in death or serious injury.

5. Wiring connections may be made either before or after actuator installed on body.

6. Place the manual operating lever on the actuator in the

OPEN position.

Align actuator coupling to slot on the shaft of the valve body and fit the head onto the valve body to ensure the shaft seats correctly (see

Figure 20, p. 27

8. Press the actuator and valve body until it secures together.

Soldering Procedures

Remove actuator as stated earlier.

2. Place valves on the pipe. Rotate valve stem so the shaft slot points at the notch in the side of the body (90° to flow direction). This protects the plug inside the valve

by removing it from the seat (see Figure 23

3. Sweat the joints, keeping outer surface free from solder.

Note: Do not use silver solder due to high temperature requirements.

Heating Coils with Direct Expansion

Cooling

Heating options for direct expansion cooling in the unit ventilator are hot water, steam or electric heat.

These coils facilitate direct expansion cooling with standard capacities. The supply and return connections are located in the right-hand end pocket. Hot water field connections are made with a 5/8 in. \[15.9\] OD male sweated joint, while steam coils have a 1 in. \[25.4\] male pipe thread (MPT) connection. Refer to

Table 8, p. 24 for

coil connection sizes.

Electric heat coils provide a third way to supply heating to the direct expansion cooling. The coil utilizes three to six preheat elements which are factory-wired.

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Installation—Sensors

Control Options

Figure 24.

Unit mtd temp sensor

(SP, OCC/UNOCC, OALMH)

(Electric heat with auto and off speeds)

X13790844-01 (unit)

Figure 28.

Wall mtd display sensor

(SP, OCC/UNOCC, COMM)

X13790886-04 (wall; 3-speed)

Figure 25.

Unit mtd display sensor

(SP, OCC/UNOCC, COMM)

X13790886-04 (unit; 3-speed)

Figure 29.

Wall mtd display sensor

(SP, OCC/UNOCC, COMM)

X13790886-03 (wall; 2-speed)

Figure 26.

Unit mtd display sensor

(SP, OCC/UNOCC, COMM)

X13790886-03 (unit; 2-speed)

Figure 30.

Unit mtd FSS (OALMH), wall mtd temp sensor

(SP, OCC/UNOCC, COMM)

X13511527-01 (wall)

X13790849-01 (unit)

X13651467-01 (comm)

Figure 27.

Wall mtd temp sensor

(SP, OCC/UNOCC, OALMH, COMM)

X13790842-02 (wall)

X13651467-01 (comm)

Figure 31.

Unit mtd FSS (OALMH), wall mtd display temp sensor

(SP, OCC/UNOCC, COMM)

X13790886-04 (wall)

X13790841-02 (unit)

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Installation—Sensors

Figure 32.

Unit mtd FSS (OLH), wall mtd display temp sensor

(SP, OCC/UNOCC, COMM)

X13790886-03 (wall)

X13790475-01 (unit)

Installing Wall-Mounted Wired

Sensors

Reference the wall-mounted zone sensor dimensions in

Figure 36, p. 30 . Position the sensor on an inside wall three

to five feet above the floor and at least 18 inches from the nearest outside wall. Installing the sensor at a lower height may give the advantage of monitoring the temperature closer to the zone, but it also exposes the sensor to airflow obstructions. Ensure that air flows freely over the sensor.

Figure 36.

Wall-mounted wired and wireless zone sensor dimensions

Figure 33.

Wireless temp sensor

(SP, OCC/UNOCC, OALMH, COMM)

X13790492-01 (wall)

X13790855-01 (unit)

Figure 34.

Wireless temp sensor with display

(SP, OCC/UNOCC, COMM)

X13790822-04 (wall)

X13790855-01 (unit; 3-speed)

Figure 35.

Wireless temp sensor with display

(SP, OCC/UNOCC, COMM)

X13790822-01 (wall)

X13790855-01 (unit; 2-speed)

0.31 in

TYP R.07 in (R1.9)

TYP 0.24 in)

2.9 in

1.08 in

0.12 in

3.39 in

4.68 in

2.48 in

10. 0.63 in

11.

1.45 in

12. 2.62 in

Sensor

When selecting a sensor location, avoid the following:

• Areas of direct sunlight

• Areas in the direct airstream of air diffusers

• Exterior walls and other walls that have a temperature differential between the two sides

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• Areas that are close to heat sources such as sunlight, appliances, concealed pipes, chimneys, or other heatgenerating equipment

• Drafty areas

• Dead spots behind doors, projection screens, or corners

• Walls that are subject to high vibration

• Areas with high humidity

• High traffic areas (to reduce accidental damage or tampering)

• Metal barriers between the receiver and the sensor (for example, plastered walls with metal lathe or metal roof decks)

• Thick, solid concrete walls between the receiver and the sensor

• Placing the sensor inside metal enclosures

Height Requirements

It is recommended that you mount the back plate a maximum distance of 54 inches above the floor. If a parallel approach by a person in a wheelchair is required, reduce the maximum height to 48 inches.

Note: Consult section 4.27.3 of the 2002 ADA (Americans with Disability Act) guideline, and local building codes, for further details regarding wheelchair requirements.

Mounting Surfaces

Using the hardware provided, mount the back plate of the sensor to a flat surface such as sheetrock or plaster, or an electrical junction box. The sensor must be mounted plumb for accurate temperature control and to ensure proper air movement through the sensor.

• If mounting onto sheetrock or plaster, use the plastic threaded anchors (pre-drilling holes is not usually necessary) and the two M3.5 x 20 mm mounting screws.

• For mounting onto an electrical junction box, use the two 6-32 x 3/4 in. screws.

Before beginning installation, consider the location considerations below. Also, refer to the unit wiring schematic for specific wiring details and point connections.

Location Considerations

Avoid mounting the sensor in an area subject to the following conditions:

• Dead spots, such as behind doors or in corners that do not allow free air circulation.

• Air drafts from stairwells, outside doors, or unsectioned hollow walls.

• Radiant heat from the sun, fireplaces, appliances, etc.

Installation—Sensors

• Airflow from adjacent zones or other units.

• Unheated or uncooled spaces behind the controller, such as outside walls or unoccupied spaces.

• Concealed pipes, air ducts, or chimneys in partition spaces behind the controller.

Location Considerations for Wireless zone sensors

Placement of the sensor is critical to proper operation (the receiver is factory mounted on fan-coil units). For most installations, barriers limit proper radio signal strength more than distance. For best radio transmission range and reliability, mount the receiver and sensor in line of sight.

Where this is not possible, try to minimize the number of barriers between the pair of devices. In general, sheetrock walls and ceiling tiles offer little restriction to the transmission range for the sensor is as follows:

• Open range: 2,500 ft (packet error rate = 2%)

• Usable range: 200 ft

• Typical range: 75 ft

Fan Mode Switch Installation

The fan mode switch ships loose inside the unit accessory bag. Follow the steps below to install the fan mode switch.

Items needed:

2 x 4 electrical junction box

Remove the brown wire if not using a field-supplied damper.

2. Remove the terminals, cut and strip wires as required for installation.

3. Level and position a 2 x 4 electrical junction box.

4. Follow the instructions given in “Wall-Mounted

Control Interconnection Wiring,” p. 42

and route the wires as shown in the wiring diagram. Refer to the typical wiring diagram or to the unit specific diagram on the unit.

5. Position the fan mode switch over the junction box with the two screws supplied.

Zone Sensor Installation

Follow the procedure below to install the wired zone sensor module.

Note the position of the setpoint adjustment knob and gently pry the adjustment knob from the cover using the blade of a small screwdriver.

2. Insert the screwdriver blade behind the cover at the top of the module and carefully pry the cover away from the base.

3. To mount the sensor back plate: a. Hold the back plate against the mounting surface and mark the screw locations.

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Installation—Sensors

b. Secure the back plate against the mounting surface using included hardware.

4. To install the zone sensor module to a standard junction box: a. Level and install a 2 x 4-in. junction box (installer supplied) vertically on the wall.

b. Pull the control wires through the cutout. Attach the module to the wall using the screws provided.

5. Strip the insulation on the interconnection wires back

0.25-inch and connect to TB1 (for wired sensors).

6. Screw down the terminal blocks (for wired sensors).

To replace the cover: a. Hook the cover over the top of the back plate. Apply light pressure to the bottom of the cover until it snaps in place.

b. Install the security screw into the bottom of the cover (if desired).

If installing a Tracer ZN520 zone sensor, see

“Control

Options,” p. 29 for more information.

Figure 37.

Figure 38.

Security screw

Wireless Sensors

Notes:

• Receivers ship installed on the unit. To remove the receiver, press in the retention tabs on the underside of the receiver enclosure and push upward.

• For more detailed information for wireless sensors,

please refer to BAS-SVX04E-EN (Installation,

Operation, and Maintenance: Wireless Sensors,

Models WTS, WZS, and WDS), or the most recent revision.

Address Setting

The process of establishing communication between a receiver and sensor is referred to as association. The following limitations apply:

• Each associated receiver/sensor set that communicates within the reception range of the wireless system must have a unique address.

It is not possible to associate more than one sensor to a receiver, nor is it possible to associate more than one receiver to a sensor.

To associate a receiver and sensor, the two devices must have their rotary address switches set to the same address.

Important: Set the addresses before applying power to the receiver and before removing the insulation strip (

Figure 39 ) from the sensor.

To set the receiver and sensor addresses:

Using a small screwdriver, set the three rotary address switches (locations S1, S2, S3) on the receiver to an

address between 001 and 999 (see Figure 39

). You do

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Note: Do not use 000 as an address. An address of

000 returns the receiver outputs to their factory defaults (zone temperature and setpoint outputs: 72.5°F, removes all association knowledge, and prevents association with a sensor.

Figure 39.

Setting the rotary address switches on the receiver and the sensor

Installation—Sensors

Note: Do not use 000 as an address. An address of

000 removes all association knowledge, reverts the sensor to a low-power hibernation mode, and sends a disassociation request to the receiver.

3. Record the address and location of the receiver and sensor pair.

Observing the Receiver for Readiness to

Associate

After initial power up, the receiver conducts a channel scan for 20 seconds. During this time, the receiver selects from

16 available channels the clearest channel on which to operate. LED1, LED2, and LED3 flash rapidly in succession

(round-robin style) while the channel scan is in progress, as shown in part 1 of the illustration.

Important: Do not attempt association (leave the insulation strip in place) until the channel scan is finished.

LED1

LED2

LED3

SIGNAL

LED5

S1 S2

POWER

C33 C34

HEATING SET

FAN/SYSTEM

SETPOINT

ZONE

GND

24VAC/DC

GND

COMM +

COMM -

Receiver

Do not remove the insulation strip yet.

C35

R77 associated with a sensor (see part 2 of the following figure).

Sec.

B1 +

Pb-FREE

LED1

LED2

LED3

SIGNAL

LED5

BATTERY

STATUS

S1 S2

ADDRESS

STATUS

WIRELESS

INSTALL

LED3

Sensor

2. Set the three rotary address switches (locations S1, S2,

S3) on the sensor to the same address as the receiver

(see Figure 39 ).

Associating the Sensor to the Receiver

To associate the sensor to the receiver:

Remove the sensor cover by firmly pressing the thumb tab at the bottom of the cover and pulling the cover away from the back plate.

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Installation—Sensors

2. Verify that the sensor is set to the same address as the receiver it is to be associated with.

3. Power the sensor by removing the insulation strip from between the two batteries.

Model WZS sensor

LED1

LED2

LED3

LED5

Push firmly, then release

Test button

Association is automatically initiated between the sensor and the receiver. When LED3 on the receiver stops blinking, association has been established.

If the first association attempt is unsuccessful, the sensor automatically re-attempts association with the receiver every 10 minutes.

Note: An associated sensor that has lost communication with the receiver will transmit an association request every 50 minutes. You can manually initiate association (see

“Manual Association

(Wireless Controls),” p. 99 ”).

Testing Signal Strength and Battery Status

To verify that the association process was successful and that the batteries have adequate charge:

Firmly press and release the Test button on the bottom of the sensor (as illustrated below).

2. For model WZS, view LED1, LED2, and LED3 to determine the signal strength. View LED5 to determine the battery status (see the following figure for model

WZS sensors).

Note: The LEDs will turn Off after 5 seconds to conserve battery strength.

For model WDS, determine the signal strength and battery status by viewing the symbols on the sensor display (see the following figure for model WDS sensors).

3. Record the results in your commissioning statement.

Note: For more information, see

“Testing Signal Strength

(Wireless Controls),” p. 97 and

“Testing Battery

Status (Wireless Controls),” p. 98

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Installation—Sensors

Model WDS sensor

Configuration button

The display will change to configuration mode. When the sensor is in configuration mode, a wrench symbol appears on the display and the menus are separated by lines, as illustrated below.

Test button

Push firmly, then release

Configuring the Wireless Display Sensor

(Model WDS only)

Note: Sensors shipped with the fan-coil are preconfigured for three speeds.

The configuration of the sensor determines which system features can be accessed and changes can be made by the tenant (for example, changes to cooling/heating mode, setpoint, or fan speed. Verify system and associated unit features before configuring the sensor.

The building owner or operator may choose to limit tenant access to certain features. This can be done through configuration. Or, if a sensor is configured to match all control capabilities of the building automation system, the locking feature can be used to restrict the tenant from making changes.

Configuration Procedure

To configure settings on the model WDS sensor, follow this procedure in the order presented.

Press the configuration button for 3 seconds.

2. Press the center button on the keypad to begin the configuration process.

Center button

3. Configure the sensor options in the order shown in the table.

• Press or to scroll to the next selection (as illustrated).

• Press or illustrated).

to move to the next menu (as

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Installation—Sensors

Setting

Temperature

• Choose Fahrenheit or Celsius

• Choose the degree resolution

(whole degrees, half degrees, or tenths of degrees).

Configuration Options

Setpoint

no setpoint single setpoint dual setpoint

System

Fan

Note: Not all fan options are available for all systems.

no system options enabled auto/off auto/off/ low/high

(Default) auto/off/low med/high

Occupancy (timed override) off/high (on) off/low/high off/low/ med/high no fan options enabled

4. Review the display to ensure that you have selected the correct configuration.

5. To return the display to operating mode, press the configuration button (see

Step 1

p. 35 ).

Note: The sensor will revert to operating mode if no buttons are pressed for 10 minutes.

Optional Features

Displaying Setpoint or Temperature.

You can configure the sensor to display either the temperature

(default) or setpoint. To select either option:

Verify that the sensor is in operating mode and at the home screen.

2. Press the up and down arrows for 3 seconds. The arrow indicates setpoint display, as shown in the figure.

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Arrow indicates setpoint is shown on display

Locking or Unlocking Settings.

You can lock or unlock the setpoint, system, or fan setting to prevent changes.

To lock or unlock a setting:

Verify that the sensor is in operating mode and at the home screen.

2. Choose a setting to lock or unlock:

• Select the setpoint by pressing the up or down arrow.

Setpoint

• From the system menu press the down arrow to select the fan menu. Use the left or right arrow to choose the setting.

Fan menu

3. Press the left and right arrows for 4 seconds.

Note: If you try to access a feature that is locked, the locked symbol will appear on the display.

If you press a keypad button to try change a locked setting, the locked symbol will flash.

Installation—Sensors

Sensor Operations

Temporary Occupancy (Timed Override)

Temporary occupancy (timed override) is available on model WDS. Temporary occupancy is selected for afterbusiness-hours adjustment of temperature setting, fan settings, or heat/cool settings, when the system has changed to unoccupied mode. System control will revert to unoccupied after a pre-determined time period.

Note: Not all systems support the occupancy function.

Model WDS Sensor

To request and cancel temporary occupancy on a model

WDS sensor, see

“Requesting Temporary Occupancy,” p. 39 .

End-of-Range Temperature Values

Receiver: The end-of-range temperature limits of the receiver for all models are 32°F to 122°F. The receiver cannot replicate temperature values outside this range. If the sensor transmits a temperature value to the receiver that is out of the receiver replication range, the receiver will “freeze” the output at the end-of-range values. This value will remain frozen until the transmitted temperature moves to between the end-of-range temperature limits.

Sensor: The end-of-range temperature setpoint limits for the model WDS sensor is 50°Fto 89.6°F.

Receiver Power-up Sequence

When power is applied to the receiver, one of the following sequences occurs. The sequence is dependent on the address setting and the association status of the receiver.

Address set to 000 and receiver is not associated with a sensor

• LED5 is constantly On, indicating power is applied and the receiver is functional.

• All models: Zone temperature and cooling setpoint default to 72.5°F.

WDS only: The heating setpoint defaults to 70.5°F and the fan/system output will be 2230

Ω (see “Output

Values—Failure and Default Modes of Operation

(Wireless Controls),” p. 101

• Status LED3 will display a 2-blink pattern diagnostic

(

Table 35, p. 97

Address set from 001 to 999 and receiver is not associated with a sensor

• LED5 is constantly On, indicating power is applied and the receiver is functional.

• All models: Zone temperature and cooling setpoint default to 72.5°F.

WDS only: The heating setpoint defaults to 70.5°F and the fan/system output will be 2230

Ω (see “Output

Values—Failure and Default Modes of Operation

(Wireless Controls),” p. 101

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Installation—Sensors

• The receiver conducts an energy scan for 20 seconds to determine the clearest channel on which to operate.

• LED3 flashes On every 2 seconds when it is ready to accept a sensor association request. When an association request is made by a sensor, the receiver instructs the sensor on which power level to operate.

Then the receiver and sensor begin operation at the appropriate channel and power level (see

“Observing the Receiver for Readiness to Associate,” p. 33 ).

Address set from 001 to 999 (and not changed since most recent power-up) and receiver is associated with a sensor

• LED5 is constantly On, indicating power is applied and the receiver is functional.

• Zone temperature and setpoint default to 72.5°F. WDS only: Heating setpoint defaults to 70.5°F, Fan = Auto,

System = Off.

• The receiver waits for a broadcast transmission from its associated sensor. When a transmission is received, the receiver positions its zone temperature and setpoint outputs appropriately.

• If the receiver does not receive a communicated signal from its associated sensor within 35 minutes, zone temperature and setpoint outputs fail, generating a unit controller alarm (see

“Output Values—Failure and

Default Modes of Operation (Wireless Controls),” p. 101

Note: Once a receiver communicates to a WZS sensor, the receiver disables (opens) its zone setpoint output indefinitely.

Sensor Transmission Time and Temperature

Variables

Sensor transition time variables are as follows:

• The maximum time between sensor temperature transmissions is 15 minutes.

• The minimum time between sensor temperature transmissions is 30 seconds.

• The minimum time for transmitting temperature setpoint changes is 10 seconds.

Note: If a sensor transmits a message to the receiver and the receiver does not reply, the sensor will retransmit the message to the receiver every 30 seconds until communication to the receiver is reestablished.

Sensor temperature time variables are as follows:

• The minimum change in zone temperature required to force a sensor transmission is:

– 0.2°F when the temperature range is between 60°F and 80°F

– 0.5°F when the temperature range is between 32°F and 60°F or between 80°F and 122°F

• The minimum change in temperature setpoint required to force a sensor transmission is:

– 0.1°C for a model WDS sensor

Operating Mode (Model WDS)

This section describes how to operate the Trane wireless

sensor, model WDS. Figure 40

shows an example of a model WDS that has been configured and is in operating mode.

Figure 40.

Wireless sensor (model WDS) in operating mode

Temperature

System settings (not available for fan-coil or Force-Flo units)

Fan settings

Test symbols (appear only when Test button is pushed

Keypad

Test button

Changing Room Temperature

This symbol shows the current room temperature, or your setpoint selection while you are making an adjustment.

When you select a setpoint, this symbol appears.

To increase the room temperature, press

To decrease the room temperature, press

2. To confirm, press or wait 5 seconds.

The display will return to the home screen.

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Changing Heating and Cooling Room Temperature

Settings (applies to some systems)

Some systems allow you to select both heating and cooling room temperature settings. If your system has this option, this symbol appears when you adjust the temperature setting.

When you adjust the cooling setting, the top arrow and snowflake flash.

When you adjust the heating setting, the bottom arrow and flame flash.

Press or select the heating/ cooling setting.

2. If in cooling mode, press to change to heating mode. If in heating mode, press to change to cooling mode.

3. Press or select the heating/ cooling setting.

4. To confirm, press wait 5 seconds. The home screen will appear.

Changing the Fan Setting

Indicates that the fan will operate as needed to reach the selected temperature.

From the home screen, activate the fan setting menu by pressing and then .

Indicates that the fan setting is On.

The number of arrows indicates fan speed

(3: high, 2: medium, 1: low).

The example shown indicates a fan on high speed.

Not all systems offer all three speeds.

the desired fan setting.

3. When the symbol for the desired setting appears, confirm your choice by

•

Pressing home screen will appear), or

Pressing

Indicates that the fan setting is Off.

(the next menu will appear), or

• Waiting five seconds.

Installation—Sensors

Requesting Temporary Occupancy

Select to request occupancy

Select to cancel occupancy

• If you need heating or cooling after normal business hours, you can

“request” temporary occupancy by pressing and holding it for

2 seconds. The occupied symbol remains on the screen and the unoccupied symbol disappears.

After 30 seconds, the unoccupied symbol will re-appear.

• To cancel temporary occupancy, press and hold for 2 seconds. The unoccupied symbol will remain on the screen and the occupied symbol will disappear. After 30 seconds, the occupied symbol will re-appear.

Error Codes

Indicates an error code

If an error code (E0–E7) is displayed, technical assistance may be required.

Lock Symbol

Indicates that a setting is locked

The lock symbol appears if you try to adjust a setting that cannot be changed.

Testing Signal Strength

Indicates excellent signal strength

Indicates satisfacto ry signal strength

Indicate s poor signal strength

Press the Test button to display the signal strength symbols.

Testing Battery Status

Indicates full battery power

Indicates

50% of battery life left.

Indicates 25% of battery life left. Replace batteries.

Flashing symbol indicates that approximately 14 days of operation remain.

Press the Test button to display the battery status symbols.

Use only UL-listed non-rechargeable 1.5 V lithium AA batteries

(Trane p/n X13770035010 or equivalent).

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Installation—Sensors

Wireless Sensor Specifications

The following table presents specifications for all models of the wireless sensor sets.

Sensor operating temperature 32°F to 122°F

Receiver operating temperature -40°F to 158°F

Storage temperature -40°F to 185°F

Storage and operating humidity range

5% to 95%, non-condensing

Accuracy

Resolution

0.5°F over a range of 55ºF to 85°F

0.125°F over a range of 60°F to 80°F

0.25°F when outside this range

Setpoint functional range (WDS only)

50°F to 89.6°F

Receiver voltage

Receiver power consumption

Housing

Mounting

24 V nominal ac/dc ±10%

<1 VA

Polycarbonate/ABS blend, UV protected, UL 94-5VA flammability rating, suitable for application in a plenum

3.24 in (8.26 cm) for 2 mounting screws (supplied)

Sensor battery

Range (a)

(2) AA, 1.5 V, 2800 mAh, lithium,

5-year life, UL listed

Open range: 2,500 ft (762 m)

(packet error rate = 2%)

Usable: 200 ft (61 m)

Typical: 75 ft (23 m)

Output power

Radio frequency

Radio channels

Address range

100 mW

2.4 GHz (IEEE Std 802.15.4-2003 compliant)

(2405 to 2480 MHz, 5 MHz spacing)

000 to 999

Minimum time between transmissions

Maximum time between transmissions

30 seconds

15 minutes

(a) Range values are estimated transmission distances for satisfactory operation. Actual distance is job specific and must be determined during site evaluation.

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Installation—Sensors

The following table presents agency compliance information for wireless sensor set models as shown.

United States compliance

(all models)

Canada compliance

(all models)

IEEE compliance for radio frequency range

(all models)

UL listed: UL 94-5VA Flammability rating

UL 916: Energy management equipment

FCC CFR47, Section 15.247 & Subpart E Digital Modulation Transmission with no SAR (FCC Identification TFP-

13651127)

This device complies with Part 15 of the FCC Rules.

Operation is subject to the following two conditions:

1. This device may not cause harmful interference, and

2. This device must accept any interference received,

including interference that may cause undesired operation.

Warning:

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

20 cm separation distance:

To comply with FCC’s RF exposure limits for general population/uncontrolled exposure, the antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter.

CSA22.2 No. 205-M1983 Signal Equipment

Industry Canada (Certification no: IC: 6178A-13651127)

Industry Canada statement: the term “IC” before the certification/registration number signifies only that the Industry Canada technical specifications were met.

Section 14 of RSS-210:

The installer of this radio equipment must ensure that the antenna is located or pointed such that it does not emit RF field in excess of Health Canada limits for the general population.

IEEE 802.15.4-2003, IEEE Standard for Information Technology—Telecommunications and information exchange between systems—Local and metropolitan area networks—Specific requirements, Part 15.4:

Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications for Low Rate Wireless

Personal Area Networks (LR-WPANs)

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Installation—Electrical

Wiring

Motor data can be found in

Table 5, p. 11

WARNING

Electrocution and Fire Hazards with

Improperly Installed and Grounded Field

Wiring!

Improperly installed and grounded field wiring poses

Failure to follow these requirements could result in death or serious injury.

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

NOTICE:

Equipment Damage!

Wiring diagrams provided in this manual are for reference only. Actual wiring for particular options/ units could vary. Refer to the diagram provided on the equipment for specific information. Failure to follow recommendations above could result in premature motor failures or equipment damage.

Do not remove or alter the wiring of the time delay relay (DL). Failure to do so could result in equipment failure.

WARNING

Fire Hazard!

When installing field provided controls, do not alter or remove any built-in unit safeties. Tampering with unit safeties could cause unit overheating and possible fire hazard which could result in death or serious injury.

Control Power.

Unit ventilator controls and control wiring can be factory mounted or field installed.

Wiring diagrams illustrate the standard unit motors with one or more speed controls. Terminal wiring is provided by Trane and the actual components used for a particular installation may differ. Control and line diagrams for the exact control system used are provided with each unit.

NOTICE:

Use Copper Conductors Only!

Unit terminals are not designed to accept other types of conductors. Failure to use copper conductors could result in equipment damage.

Electrical Wiring

Unit Wiring Diagrams.

Specific unit wiring diagrams, based on unit options ordered, are provided inside each unit and can be easily removed for reference. Use these diagrams for connections or trouble analysis. Wiring diagrams are attached on the inside of the front panel of the unit.

Supply Power Wiring.

Refer to the unit nameplate to obtain the minimum circuit ampacity (MCA) and maximum fuse size (MFS) or maximum circuit breaker

(MCB) to properly size field supply wiring and fuses or circuit breakers. Refer to the unit operating voltage listed on the unit wiring schematic, submittal, or nameplate.

Reference the wiring schematic for specific wiring connections.

Note: All field wiring should conform to NEC and all applicable state and local code requirements. The control panel box is always on the end opposite the piping connections. Access the control box by removing the two screws that secure the front cover. This will allow the panel to be removed, to provide access to the electrical components.

If the unit does not have a disconnect switch, the power leads and capped ground wire are inside the control panel.

If the unit has a disconnect switch, the power leads are wired to the junction box switch on the control panel. Pull the capped ground wire into the junction box.

Electrical Grounding Restrictions.

All sensor and input circuits are normally at or near ground (common) potential. When wiring sensors and other input devices to the Tracer controller, avoid creating ground loops with grounded conductors external to the unit control circuit.

Ground loops can affect the measurement accuracy of the controller.

All input/output circuits (except isolated relay contacts and optically isolated inputs) assume a grounded source, either a ground wire at the supply transformer to control panel chassis, or an installer supplied ground.

Wall-Mounted Control Interconnection Wiring.

The installer must provide interconnection wiring to connect wall-mounted devices such as a fan mode switch or zone sensor module. Refer to the unit wiring schematic for specific wiring details and point-to-point wiring connections. Dashed lines indicate field wiring on the unit wiring schematics. All interconnection wiring must conform to NEC Class 2 wiring requirements and any state

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Important: Do not bundle or run interconnection wiring in parallel with or in the same conduit with any high-voltage wires (110 V or greater).

Exposure of interconnection wiring to high voltage wiring, inductive loads, or RF transmitters may cause radio frequency interference (RFI). In addition, improper separation may cause electrical noise problems. Therefore, use shielded wire

(Belden 83559/83562 or equivalent) in applications that require a high degree of noise immunity. Connect the shield to the chassis ground and tape at the other end.

Note: Do not connect any sensor or input circuit to an external ground connection.

Supply Power.

Power supply wiring is to be connected to terminals 1 and 2 at the junction box in the left end pocket, below the discharge air grille.

NOTICE:

Use Copper Conductors Only!

Unit terminals are not designed to accept other types of conductors. Failure to use copper conductors could result in equipment damage.

Electric Heat (Option)

Installation—Electrical

Note: The supply neutral wire must be connected to the neutral terminal block.

Operational controls and an electric heating safety device are factory mounted. The safety device is a high temp cutout which de-energizes electric heating elements through the K1 safety contactor.

DX System

A typical unit ventilator with DX coil includes an outside air thermostat, a frost prevention thermostat, and a 24 V transformer for condensing unit control.

Wire sizing is the same as given for the thermostat wiring in the condensing unit installation instructions, or may be obtained from the nameplate. The condensing unit must be controlled by the same room thermostat that also controls the unit ventilator.

WARNING

Hazardous Voltage!

Supply Power.

Supply power wiring is to be connected to the following line terminals in the right-hand end pocket:

• 208V or 240V, 3-phase, 3-wire system: L1, L2, and L3.

• 480V, 3-phase, 4-wire system: L1, L2, L3, and N

(neutral)

See “Wiring Diagrams,” p. 84 for a typical unit line and interconnecting wiring diagram for electric heat coils.

NOTICE:

Equipment Damage!

480 V/3-Wire is NOT compatible with Trane Classroom

Unit Ventilator equipment. There must be a 4-wire system with a separate ground. Failure to provide a 4wire system could result in equipment damage.

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Installation—Electrical

Split System Start-Up

After all piping and wiring has been completed, follow the instructions provided with the condensing unit for control testing and system start-up. If sweat type field-piped systems are being used, then pressure testing, evacuation, and refrigerant charging will be required.

Two bulbs will also be shipped with a split system unit:

• Frost stat bulb

• TXV valve (used with R-410A)

Both components are to be field installed using the installation kit shipped with the unit. For complete installation instructions and locations, refer to the tag attached to the coil. Refer to

Figure 41, p. 44 for an

example of the installation tag.

Figure 41.

Frost stat / TXV valve installation tag

IMPORTANT:

INSTALLER MUST MOUNT THERMAL

EXPANSION VALVE BULB AND FROST

PROTECTION BULB (if suppled) TO

SUCTION LINE AFTER CONNECTION

OF FIELD REFRIGERANT PIPING

X39001939010A

MOUNT BULB IN

HORIZONTAL PLANE

9:00 9 3 3:00

8:00 6

4:00

RECOMMENDED

BULB PLACEMENT

Note: Depending on the controls package ordered with the unit, not all installations will require mounting the frost stat bulb.

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ECM Overview and Setup

Overview

This section changes to vertical unit ventilator units, integrating new Trane Brushless DC motors and controllers. This exciting new series delivers outstanding comfort, safety, and performance with greatly reduced energy consumption compared to traditional units with permanent split capacitance AC motors.

The new series of units will provide a long service life with proper installation and operation. The new system provides a high degree of flexibility and configurability, but the simplicity of customized factory configuration appropriate to most installations.

Very little intervention is needed by service and installation personnel in most applications; however, installers must read through the entire document before beginning installation of the new equipment.

This literature focuses on unit motors and controls, including three new circuit modules developed specifically for this series.

General Information

There are four primary components that enable the technology on your product:

Trane BLDC Motor

2. ECM Engine Board

3. Adapter Board

4. CSTI Adapter Board

The motors and modules are combined as systems, and cannot work without each other.

Trane BLDC Motor

Figure 42.

Trane BLDC motor

• The BLDC motor has integrated electronics, overload protection and short circuit protection. The motor contains no user-serviceable components inside.

NOTICE:

Equipment Damage!

The motor harness attached to the single plug to which the motor mates contains the very important motor voltage jumper and should not be modified or substituted. Failure to follow this instruction could result in equipment damage.

• The motor mates to the unit electrically via a single plug that contains both the operating voltage and the control signals that are needed for correct operation.

• The BLDC motor comes in a double shaft configuration for all vertical unit ventilator sizes (075, 100, 125, 150).

Note: Sizes 125 and 150 have two motors installed.

• The BLDC motor has two voltage variations, 115/

208-230V and 277V. Units with three-phase and neutral have motors wired to the L-N (as opposed to L-L). The

115/208-230V is configured for voltage by use of an external jumper. If the jumper is present the motor will be configured for use with 115V. The jumper must NOT be present for use with 208-230V.

ECM Engine Controller

Figure 43.

ECM engine controller

Note: Display and Menu/

Enter, Increase, and

Decrease Buttons

High Efficiency Brushless DC (BLDC) Motor Core

Motor Base Housing Potted Electronics Package

UV-SVN03F-EN

• The ECM engine controls and reports the performance of up to two Trane BLDC motors.

• The engine also co-ordinates the operation of the fan in response to electric heat behavior, and electric heat behavior in response to hydronic heat behavior and fan behavior.

• The engine incorporates a user interface that allows adjustment of certain unit parameters and provides constant feedback on motor operation.

• The engine integrates service and troubleshooting tools, including high-precision tachometers, fan status, and electric heat-enable indicators.

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ECM Overview and Setup

• The engine integrates a versatile configurable auxiliary temperature sensor.

• The engine incorporates various safety and lockout features, such as maintaining proper fan speeds, if electric heat is called for.

Standard Adapter Board

Figure 44.

Adapter board

Note: Customer Low-

Voltage

Interface for

Fan Speeds,

Variable Fan

Speed, and

24 Vac Supply

CSTI Adapter Board

Figure 45.

CSTI adapter board

• The adapter allows direct customer interfacing through the use of terminal strips. Standard interfacing includes:

– Fan Speeds (H, M, L) (for wall mounted fan speed switches)

– Variable speed (0–10V) inputs

• The standard adapter board eliminates many separate wiring harnesses in the panel and allows simple, mistake-proofed single-plug interfacing of:

– The ECM engine controller

– Transformers

– Motors

– Valves

– Dampers

– Electric heat control

– Fan speed switches

– Main Power (except electric heat).

• Electric heat lockout circuits and fan proving circuits for electric heat are standard, and are pre-configured at the factory.

Customer Low-Voltage Interface for Valves, Electric Heat, Dampers, Fan

Speeds, Variable Fan Speed, and 24 Vac Supply

Valve(s), Electric Heat, and Changeover Configuration Switches (Factory-

Set)

• Performs all the functions of the standard adapter module, but in addition, provides convenient field connections to factory mounted end devices, including:

– Valves

– Dampers

– Electric Heat

• Performs courtesy “inversion” of thermostatic inputs to match selected valves:

– Standard thermostats put out only “on” signals, however customer may select a normally open valve. A selectable switch allows the customer to invert the thermostat outputs for correct operation.

These switches are set at the factory, but can be adjusted in the field.

– Sophisticated changeover function when used with a thermistor, that replaces traditional bi-metallic disc temperature switches:

• Board will automatically honor only the appropriate customer request (Heat/Cool) depending on sensed water temperature.

• Feature can be enabled or disabled with a selector switch—however, it is set correctly at the factory, based on customer choice of coil.

• The bi-metallic disc temperature switch emulation is programmable, and dead-band range can be adjusted.

• Electric heat lockout circuits and fan proving circuits for electric heat are standard, and are pre-configured at the factory.

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ECM Overview and Setup

Installation and Initial Setup

WARNING

Hazardous Voltage w/Capacitors!

Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors. Verify with an appropriate voltmeter that all capacitors have discharged. Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury.

UV-SVN03F-EN

WARNING

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

• The BLDC motors contain capacitors which store residual energy. Please keep clear of the fan wheels for 5 minutes after the power has been removed from the system, as a power request with the motor powered off, could result in a very short period of actuation.

• All settings take effect immediately, including fan startup and enabling of electric heat. Caution should be taken to stay clear of hazardous voltages, moving parts and electric heat elements while making adjustments to the ECM engine board. If it is not practical to stay clear of these areas during adjustment of the ECM engine board, please contact

Trane Global Parts for configuration kit that allows easy powering of the engine board outside of the unit with a 9V battery.

• The adapter boards contain high voltage.

Configuration adjustments to the ECM engine board should be made through the SMALLER of the two low-voltage lids on the front of the control panel, through the low-voltage insulation/shielding.

• Changes to switch settings on the CSTI adapter board take effect immediately. Changes should be made to the CSTI configuration switches with the power off.

• Initial hookups to the CSTI and Standard Adapter board, including low voltage interconnections, must be made with the power off.

• Do not make connections to the motors or the adapter boards while power is ON. Do not remove connections to the motor or the adapter boards while the power is ON.

• Do not free spin the fan wheels with your hands while the unit is powered on. The system is constantly scanning and responding to the operational status of the motors.

Installation and Initial Setup

Note: Normally, the Trane BLDC motors are configured for soft ramps and transitions between speeds.

However, to aid in commissioning of the unit, for approximately 10–15 minutes, the ramps will be shortened to quickly observe proper unit behavior and response to speeds.

For new installations, all boards and motors are preinstalled and pre-configured according to the unit configuration, indicated by its model number.

Under normal and intended operation, the only required intervention specific to the new BLDC units is the wiring of:

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ECM Overview and Setup

• Wall-mounted low-voltage fan speed switch inputs to the adapter boards’ terminal strips and 24 Vac tap to field-installed fan speed switch.

• Field-supplied controllers/thermostats to the adapter boards’ terminal strips and 24 Vac power tap to field-supplied controller/thermostat.

• Adjustment and calibration of the variable speed inputs (VSP/0–10V) on the system.

• Adjustment, calibration or disabling of the optional auto-changeover function on CSTI units.

Otherwise, proceed with the mechanical, electrical and controls installations as defined in other sections of this manual

Proceed with the power on after installation, as defined in the other sections of this manual.

Wall Mounted Low Voltage Fan Speed Switch/

Customer-Supplied Controller/Thermostat

Instructions

WARNING

Hazardous Voltage w/Capacitors!

WARNING

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

• Hook ups to the adapter boards should be made only with the power off to the unit.

• Only connect Class 2 voltages to the terminal blocks on the adapter boards that share a common with the unit mounted low-voltage transformer.

• Secure low voltage connections firmly to terminal strips, and strain-relieve all low voltage connection to prevent accidental detachment and possible shortcircuiting of high voltage components. Care should be taken to avoid contact of low voltage wiring to the back side of the adapter boards, which contain high voltage.

Note: Specifications subject to change without notice.

Consult the unit submittals and unit schematics before determining hookup requirements to the fan-coil unit. Terminal block positions, polarities and assignments are determined for specific unit configurations only. Signal assignments are indicated, for reference only.

Both adapter boards come equipped with integrated terminal blocks to hook up to the field supplied/mounted

Fan Speed Switches and external controls. Connections should be made to the screw terminals with wires between

16 AWG and 24 AWG, with a ~4–5-mm wire strip length.

The terminal blocks have 5-mm spacing, and are equipped with 3-mm screws. The field-supplied wires should have an insulation rating of 600V.

Standard Adapter Board Field Connections

Figure 46.

Standard adapter board field connections

3 2 1 5 4 3 2 1

VSP 10V

VSP 0–10V

VSP DC COM

24 Vac Y (gnd)

24 Vac B (com)

High

Medium

Low

All customer connections to the two adapter boards are made to the terminal strips on both adapter boards.

Screw terminal blocks provide convenient access to fan controls for High, Medium, Low, and Variable speed. In addition, a courtesy 10 Vdc supply is provided for use with an external potentiometer or rheostat. The 10 Vdc supply supports up to 10 mA draw.

TB3 (right five positions) is normally used to provide 24V hookup to a wall mounted fan speed switch, and to accept the returns from the switch for High, Medium, and Low requests.

TB4 (left three positions) is normally used to control the system with a 0–10 Vdc output from a thermostat/ controller, or a fan control rheostat/potentiometer.

The terminal block functional assignments and polarity are shown for reference only, and the schematics that ship with each unit should be consulted before wiring. Wiring assignments are configured for each unit.

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Adjustment and Configuration of the

Engine Board

ECM Overview and Setup

CSTI Adapter Board Field Connections

Figure 47.

CSTI adapter board field connections

3 2 1 13 12 11 10 9 8 7 6 5 4 3 2 1

VSP 10V

VSP 0–10V

VSP DC COM

24 Vac Y (hot)

Damper Open

24 Vac Y (gnd)

High

Medium

Low

V1Op/Cooling

Not used

10. V1C1 (not std)

11.

V2Op/EH1St/Heating

12. V2C1/EH2St (not std)

13. Dmp Cl (not std)

The CSTI adapter board provides all the hookups of the standard adapter board, but in addition provides hookups for valve control (main and auxiliary coils), electric heat control and damper control.

Screw terminal blocks provide convenient access to fan controls and to end device control. In addition, a courtesy

10 Vdc supply is provided for use with an external potentiometer or rheostat. The 10 Vdc supply supports up to 10 mA draw.

TB3 (right 13 positions) is normally used to provide:

24 Vac supply to a wall fan speed switch or

2. 24 Vac supply to a field-installed unit-mounted controller, or a wall-mounted controller or thermostat

3. Inputs (returns) for thermostatic fan control: High,

Medium, and Low

4. Inputs (returns) for cooling/heating requests

5. Inputs (returns) for electric heat requests

6. Inputs (returns) for damper operation requests

TB4 (left three positions) is normally used to control the system with a 0–10 Vdc input from a thermostat/controller with a variable speed output, or a fan control rheostat.

WARNING

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

Trane Global Parts for configuration kit that allows easy powering of the engine board outside of the unit with a 9V battery.

• Configuration adjustments to the ECM engine board should be made through the SMALLER of the two low-voltage lids on the front of the control panel, through the low-voltage insulation/shielding.

CAUTION

Burn Hazard!

On electric heat units, certain parameter values are locked out to prevent overheating of the unit. These functions will appear to be saved; however, they will not be accepted if the Electric Heat Protection setting is

“On”. Do not change the Electric Heat Protection setting to “Off” and make changes to the protected settings unless you are programming an unconfigured service replacement board to match the unit settings on a ECM configuration label. Failure to follow this instruction could result in the unit overheating and becoming hot to the touch, which could result in minor or moderate injury, and/or equipment damage.

Note: The engine board functions and unit specific settings are summarized on the ECM engine configuration label affixed to the back side of the control panel low voltage lid on every unit.

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ECM Overview and Setup

Figure 48.

ECM engine label

The ECM engine board features a nested menu integrated user interface (UI) that supports:

Status display for instant touch-free confirmation of unit operation.

2. Configuration parameter and value display and modification changes (using integrated menu/set buttons).

3. Error code prioritized reporting.

Status Display

Figure 49.

Status display

The ECM engine board contains a four-digit, sevensegment display that is used to present information in a format close to real-world language, while having a smallform factor. Most characters are immediately recognizable; however, please consult

Table 9 and

Table 10 for the graphical representation of each

alphanumeric character.

Table 9.

Screen representation of alphabetical characters

A B C D E F G H I J K L M

            

N O P Q R S T U V W X Y Z

            

To check status, configuration, or to change settings on the engine board with the power on the unit, detach the low voltage access lid and look or reach through the low voltage access panel.

2. The ECM engine label is affixed to the back or front of the low voltage access lid.

Table 10.

Screen representation of numeric characters

1 2 3 4 5 6 7 8 9 0

         

Note: Characters on the ECM engine board display appear in red, on a black background.

The display contains decimal positions as well that change position with each parameter, as appropriate. Under normal conditions (i.e., with no error code displayed), the status will loop the following message:

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ECM Overview and Setup

RPM Mode

RUNNING/ FAN STATUS

CONTINUOUS LOOP

Displayed when:

1) No error codes are present

2) Motor has completed ramping



 → 



 → 





/





Indicates the current rpm of Motor 1 in the system. “0” rpm here indicate that no fan speed has been requested.

Indicates the current rpm of Motor 2 in the system. “0” rpm here indicate a fan off condition OR a fan “missing” condition (a) .

Indicates the status being calculated or Fan Motor 1. If “off,” this indicates that either:

1) No fan speed is being requested or

2) The fan performance is failing to meet the request; refer to

“Troubleshooting (ECM),” p. 105 for additional

information.

If “on,” this indicates that the fan is performing correctly and will be used to report fan status correctly, depending on



mode.

Indicates the status being calculated or Fan Motor 2. If “off,” this indicates that either:

1) No fan speed is being requested or

2) The fan performance is failing to meet the request; refer to

“Troubleshooting (ECM),” p. 105 for additional

information.

3) If the target speed for Motor 2 is “0,” this is used to

indicate a missing motor (a) .



/







/



If “on,” this indicates that the fan is performing correctly and will be used to report fan status correctly, depending on



mode.

Indicates that the temperature sensing circuit has calculated a logical “on” based on the settings of the following parameters:



/



/

(a) Motor 1 is the only motor in unit sizes 075 and 100; unit sizes 1250 and 1500 contain two motors.



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ECM Overview and Setup

Configuration parameter and value display and modification changes

The ECM engine board’s on-board user interface is easy to use and supports:

Verification/auditing of on-board parameter settings

(read-only)

2. Adjustment of the on-board settings (write)

Figure 50. User interface input buttons

The user interface has three input buttons, from left to right:

“Menu/Set”

2. “Decrement”

3. “Increment”

Each button has several different actuation levels depending on length of press, and what the UI is currently displaying.

Table 11.

Button actuation levels

Button

Short Press in

Status Display

Short Press in

Configuration

Display

Long Press/Hold in Status Display

Long Press/Hold in Configuration

Display

Duration

<1 sec

>3 sec

Menu/Set

Action

None

Toggles between parameter name and value without saving

(abandons value if changed).

Enters the configuration menu

If on a parameter name, toggles to the value. If on a parameter value, saves the value settings and returns to the parameter name as confirmation.

Button

Short Press in

Status Display

Short Press in

Configuration

Display

Long Press/Hold in Status Display

Long Press/Hold in Configuration

Display

Duration

<1 sec

>3 sec

Decrement

Action

None

Scrolls through parameter names, or decreases value of parameter.

N/A

Faster scroll through parameter name, or faster decrease of values of parameters.

Button

Short Press in

Status Display

Short Press in

Configuration

Display

Long Press/Hold in Status Display

Long Press/Hold in Configuration

Display

Duration

<1 sec

>3 sec

Increment

Action

None

Scrolls through parameter names, or increases value of parameter.

N/A

Faster scroll through parameter name, or faster increase of values of parameters.

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ECM Overview and Setup

Configuration Use Examples

Example 1.

To view the value of parameters without saving. In this case we wish to verify that the “Low Speed

Value” for Motor 1 is set correctly to 800 rpm.

We start with the ECM engine scrolling status display and proceed as follows:

It would appear that the value has been changed, but if we check the value, we notice that the original value has been retained.

Example 2.

We wish to change the change the value of

Low Speed to 820 rpm:

We will continue from the previous example as shown below, using a long press to “save” the new desired value.

Note: If the display has timed out and returned to the status loop, repeat Example 1 to arrive back at this example’s starting point.

Example 3.

We wish to double check to see if the value of

“820 rpm” has been saved.

Note: If the display has timed out and returned to the status loop, repeat Example 1 and Example 2 to arrive back at this example’s starting point.

Priority / Error Display

Under special conditions, the status display will interrupt briefly to prioritize display of events:

Notes:

• During error displays, the user interface will be disabled, until the error is removed or resolved.

• If changes are made to parameters and saved, most settings take effect immediately. Any change to fan speeds will take effect and cause the configuration menu to exit immediately to begin tracking speeds via the on-board tachometer.

• Where practical, the unit will offer “limp-in” performance, but to ensure safe operation, certain unit functions will be disabled. For example, if one motor fails, the unit will display an error code, but the second motor (if present) will continue to operate. However, to ensure safe operation, the electric heat (if present) will be disabled.

• If a error occurs while the configuration menu is in effect, all unsaved values will be discarded and the error codes will be displayed.

Example 4.

We wish to change the value of a protected value on an electric heat unit.

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ECM Overview and Setup

Error Codes

Displayed during abnormal operation.



















 → 

 → 



Indicates a locked rotor condition of Motor 1. The motor will be locked out until the cause has been resolved, and the power cycled; refer to

refer to “Troubleshooting (ECM),” p. 105

for resolution details.

Motor 2 will continue to operate, but will not be monitored. Fan Status function, if being used, will report an inoperative motor. Electric heat and changeover heat will be shut down.

Indicates a locked rotor condition of Motor 2. The motor will be locked out until the cause has been resolved, and the power cycled; refer to

“Troubleshooting (ECM),” p. 105

for resolution details.

Motor 1 will continue to operate, but will not be monitored. Fan Status function, if being used, will report an inoperative motor. Electric heat and changeover heat will be shut down.

Indicates that Motor 1 has experienced a run-away or over speed condition, and has been shutdown. The unit will offer limited “limp-in” performance, and Motor 2 will continue to operate, but will not be monitored. Fan Status function, if being used, will report an inoperative motor.

Refer to

“Troubleshooting (ECM),” p. 105

: to reset, the cause must be resolved and the power to the unit cycled. Electric heat and changeover heat will be shut down.

Indicates that Motor 2 has experienced a run-away or over speed condition, and has been shutdown. The unit will offer limited “limp-in” performance, and Motor 1 will continue to operate, but will not be monitored. Fan Status function, if being used, will report an inoperative motor.

Refer to

“Troubleshooting (ECM),” p. 105

: to reset, the cause must be resolved and the power to the unit cycled. Electric heat and changeover heat will be shut down.

Indicates the motor is transitioning between speeds, ramping up or down. The message “RAMP” is briefly displayed, followed by the target speed for “Motor 1” only. Once the target speed has been reached, the status display will resume operation.

On power on, the version of software is briefly displayed, followed by the results of a POST (power on self test).

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ECM Overview and Setup

Initial Setup and Configuration

After connections of power and hookup of customer installed controls/fan speed switches and under normal/ operative conditions the only adjustments needed to be made to the ECM engine board during commissioning of the unit are:

• Adjustment and calibration of the variable speed inputs (VSP/0–10V) on the system, where applicable.

• Adjustment, calibration or disabling of the optional auto-changeover function on CSTI units, where applicable.

In addition, the CSTI adapter board offers configurability that can be used in special cases to adjust the following operation of the unit:

• Courtesy cooling/main valve logic inversion relays for use with normally open valves

• Courtesy heating/auxiliary valve logic inversion relays for use with normally open valves

• Changeover function for use with changeover coils (in conjunction with the ECM engine board)

The switches are factory-set based on the model number configuration as ordered; however, the information is provided below to aid in the understanding of the operation of the system.

Configuration

Configuring the ECM Engine Controller

Adjustment and Calibration of the Variable

Speed Inputs (VSP/0–10V)

WARNING

Hazardous Voltage w/Capacitors!

UV-SVN03F-EN

WARNING

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

• The adapter boards contain high voltage.

Connections to the adapter boards/changes to the

CSTI configuration switches should be made only with the power to the unit disconnected.

• The adapter boards contain high voltage.

Configuration adjustments to the ECM engine board should be made through the SMALLER of the two low-voltage lids on the front of the control panel, through the low-voltage insulation/shielding.

Trane Global Parts for configuration kit that allows easy powering of the engine board outside of the unit with a 9V battery.

CAUTION

Burn Hazard!

NOTICE:

Equipment Damage!

You MUST follow all recommendations below. Failure to do so could result in equipment damage.

• Care should be taken in the system to use a single

24 Vac supply system to avoid damage to equipment.

• Care should be taken to observe proper polarity and grounding in the hookup of the 0–10V system to avoid damage to equipment.

Notes:

• The 0–10V (variable speed) inputs are available for use, but are not mandatory. The Trane Brushless DC system

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ECM Overview and Setup

comes standard with three to five field-accessible thermostatic inputs (with adjustable speed), so the use of the 0–10V inputs is optional.

• All inputs are independently configurable and simultaneously accessible, and the ECM engine will choose the highest user (configured and requested) speed. However, care should be taken with customer controls to avoid contention of signals.

The ECM engine and adapter boards offer standard, normalizing 0–10V Variable speed fan inputs for use with field supplied controllers or thermostats. These inputs can be used as the only input to the system, used in addition to the thermostatic (H, M, L) inputs, or not used at all. The inputs are accessible via 1TB4 on the adapter boards.

The ECM engine is factory configured to drive the unit to a minimum speed (catalogue “low speed” value), defined as



and



once the analog (0–10V) input is honored. As a default, the noise floor/threshold is set to

3 percent (0.3V). At 0.3V, the system will drive the motors to the speeds defined in defined as



and



. If the analogue input goes to 10V, the ECM engine will drive the motor to maximum speed (normally catalogue “high speed” value), defined as



and



, and will change speed in response.

Although the ECM engine board ships with settings that will work with most 0–10 Vdc outputs, calibration should be performed to maximize response range and controller authority. Typically, the only settings needed for the VSP inputs are calibration of the signal to ensure that the system obeys the following rules:

The minimum output from the field supplied controller is met with a positive fan response. That is, we do not want the



setting on the ECM engine board to be higher than the minimum output of the field supplied controller, as the ECM engine will “ignore” a portion of the usable range of the customer fan variable speed output.

2. The minimum output from the field supplied controller is not significantly greater than the floor setting

 floor. If the minimum output of the controller is significantly greater than the floor setting, the first point that the motor will turn on will be above the



and



value. The full range of motor control will not be fully utilized in this case, as the motor will never reach the low speed motor analogue input scaling value for Motor 1 and Motor 2 (



and



)

3. The maximum output of the controller needs to be 10V, or if lower, needs to be compensated using the analog input scaling value,



to normalize the operational range. As a default, the scaling value is set to 1.00 (so a voltage of 5V will be graded as 5V); however, to compensate for long runs or lower max voltages (i.e., lower than 10.00), the scaling value can be increased accordingly to maximize operational range.

For example, if the voltage is only reaching a value of

9.0V at the adapter boards, then the



parameter should be set to (10/9=)

 .



. If left un-calibrated, the unit will never attain maximum speeds, defined as



and



4. The ECM engine can accept slightly over-biased inputs up to 12 Vdc, and the



parameter can be set to a value less than 1.0 to compensate.

VSP Setup Examples

Example 1:



set too high and



set too high

Example 2:



set too high but



set correctly

Example 3:



set correctly and



set correctly

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ECM Overview and Setup

Use of Potentiometer/Rheostat For VSP

WARNING

Hazardous Voltage w/Capacitors!

Figure 51.

Typical connection

WARNING

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

• The adapter boards contain high voltage.

Connections to the adapter boards/changes to the

CSTI configuration switches should be made only with the power to the unit disconnected.

• All settings take effect immediately, including fan startup, enabling of electric heat. Caution should be taken to stay clear of hazardous voltages, moving parts and electric heat elements while making adjustments to the ECM engine board. If it is not practical to stay clear of these areas during adjustment of the ECM engine board, please contact

Trane Global Parts for configuration kit that allows easy powering of the engine board outside of the unit with a 9V battery.

A courtesy 10-Vdc supply is provided that can support a

10-mA draw. The use of a 1K or a 10K potentiometer is recommended, and only a stand-alone potentiometer (not shared with any other electrical system) should be employed. When a simple potentiometer is used as

depicted in Figure 51

, the



setting will define a nullzone (off).

The typical connection is depicted in

Figure 51 ; however,

please consult the unit schematic for the most updated instruction, as

Figure 51 is provided as reference only.

Adjustment or Disabling of Optional Auto-

Changeover Function on CSTI Units

WARNING

Hazardous Voltage w/Capacitors!

WARNING

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

• The adapter boards contain high voltage.

Connections to the adapter boards should be made only with the power to the unit disconnected.

Trane Global Parts for configuration kit that allows easy powering of the engine board outside of the unit with a 9V battery.

UV-SVN03F-EN 57

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ECM Overview and Setup

•

The ECM engine board provides additional temperature controlled logic to help coordinate certain electric-heat and valve logic functions:

• On units with electric heat and a changeover coil, the engine board and adapter boards are pre-configured to cause hydronic heat and electric heat to be mutually exclusive:

– On units with ComfortLink™ controls (Tracer ZN controllers), the Tracer ZN board will serve as the primary logic to select the electric heat only if hot water is not available, but the engine board will service as a backup lockout.

– On units with Customer Supplied Controllers (CSTI units), the engine board and CSTI board will serve as the primary lockout.

• On CSTI units selected with a changeover coil configuration, the engine board is factory configured to work in conjunction with the CSTI adapter board to provide a useful auto-changeover function.

Traditionally, a fixed setpoint bi-metallic disc temperature switch is used to provide changeover with customer controls; however, the engine board has defeatable and configurable bi-metallic disc temperature switch emulation when combined with the CSTI adapter board. The ECM engine is preconfigured for typical values, so changeover settings do not necessarily need to be changed.

– An NTC thermistor is supplied and affixed to the supply pipes where applicable. The ECM engine has several settings that affect the operation of the changeover function:

•



parameter should normally be set to

 or



to use the changeover functions.



parameter should be chosen if the unit has a changeover coil without electric heat.



parameter should be chosen if the unit has a changeover coil with electric heat.

Generally, this will perform the same as the

 parameter but in addition, will disable heating function on electric heat and on the changeover coil if there are fan failures. The auxillary heating coil function will continue to operate and respond to the customer heating request.



parameter should be set to



for CSTI units and to



for ComfortLink controller units.



parameter defines the temperature at which the engine board will close the triac onboard the ECM engine (if



parameter is set correctly).



parameter defines the temperature at which the engine board will open the triac onboard the ECM

Engine (if



parameter is set correctly). By leaving a “gap” between the make and break value, we will simulate hysteresis of a real bi-metallic disc temperature switch.

• When combined with the CSTI adapter board, the bimetallic disc temperature switch emulation and the electric heat lockout function will work when the switches are set correctly.

Adjustment and Configuration of the CSTI

Adapter Board

CAUTION

Burn Hazard!

If SW4 is turned off, the factory/customer controller/ thermostat will be able to actuate the electric heat while hot water is available or if the fans have failed.

This switch should NOT be turned off if the unit schematic indicates that it should be on, to prevent overheating of the unit (due to simultaneous electric heat and hydronic heat actuation, or failure of the fan) and to use the preferred hydronic heating over electric heat. Failure to follow this instruction could result in the unit overheating and becoming hot to the touch, which could result in minor or moderate injury, and/or equipment damage.

For CSTI units, the board mounted switches have to be set appropriately to enable the desired functionality.

Figure 52.

CSTI adapter board: board-mounted switches

Table 12. CSTI adapter board: switch functions

Switch

(L-R)

Function

UP position

(towards terminal strip)

DOWN position

(towards black relays)

SW1

Valve one operation logic

Normally

Open Valve

SW2

Valve two operation logic

Normally

Open Valve

SW3

Changeover

Function

Changeover

Function ON

SW4

Electric Heat /

Fan Proving

Function

Electric Heat /

Fan Proving

Function

Normally

Closed Valve

Normally

Closed Valve

Changeover

Function OFF

Electric Heat /

Fan Proving

Function

Notes:

• All switches are factory-set based on customer configuration of the unit model number. The unit will function correctly as shipped; however, the switch functions and positions are depicted for customer convenience and for service and troubleshooting aids.

• SW3 and SW4 work in conjunction with settings on the

ECM engine controller. Simple activation of

UV-SVN03F-EN

UV-SVN03_.book Page 59 Thursday, January 24, 2013 5:27 PM changeover and electric heat lockout function may not work correctly unless the ECM engine board is configured to perform these functions.

• Customers are advised to locate the changeover coil temperature sensor on the bypass line if possible, to avoid measuring standing water temperature.

• If a 4-pipe unit with changeover function is selected, the heating input will drive the main coil if hot water is detected, but will always drive the auxiliary coil or electric heat (where available).

• Where electric heat is available with a changeover coil, the electric heat is factory-configured to be deactivated if there is hot water available and if there is a fan failure.

The CSTI board comes with courtesy valve inversion relays that allow both normally open and normally closed two-position valves to be used with simple thermostats that do not have the configurability to adapt to the customer choice of valves. Independent switches, SW1 and SW2, are provided for 2-pipe or 4-pipe units, or 2-pipe units with an optional reheat coil. The functions of SW1 and SW2 is downstream of the changeover function (SW3 and ECM engine board). Decisions made by the changeover circuits will be flowed to the inversion circuits, if they are selected.

SW3 enables or disables the changeover function for

2-pipe changeover coil units, or 4-pipe units where the coil has both a heating/cooling circuit and a heating circuit piped internally. If SW3 is turned off, the changeover function will be disabled, and the unit will then be configured as a cooling only coil, a heating only coil, or a combination of cooling only/heating only coil. Thus, customer cooling requests will drive the main valve, and heating requests will drive the auxiliary valve.

The changeover function is designed to work with customer controllers that request heating or cooling

(based on customer request), but have coil water temperatures that are “changed over” from heating to cooling (or cooling to heating) depending on the season and the building equipment available. Customer thermostats MUST be hooked to the correct terminal strip locations (V1 and V2) for the changeover function to work.

Cooling

In general, the (CSTI) changeover function will provide cooling if:

A unit is factory configured with a changeover coil

(cooling/heating) as the only coil or as the main coil portion.

2. SW3 on the CSTI adapter board is turned on, and the



parameter set to





to use the changeover functions.



parameter should be chosen if the unit has a changeover coil without electric heat.



parameter should be chosen if the unit has a changeover coil with electric heat. Generally, this

UV-SVN03F-EN

ECM Overview and Setup

will perform the same as the



parameter but will in addition, disable the heating function on electric heat and on the changeover coil heat if there are fan failures. The auxiliary heating coil valve will continue to respond to customer heating requests.

3. The ECM engine has sensed that there is cold water available on the supply/bypass line for the changeover coil. In this case, “cold” water is inferred by the ECM engine if: a. A 10K NTC thermistor (similar to Trane part number

X13790374010) is wired properly to the engine board, through the crossover cables and CSTI adapter boards.

b. The input impedance of the thermistor circuit must be set correctly (the



parameter should be set to



for CSTI units).

c. The temperature sensed is lower than the

 parameter.

d. The



parameter is higher than the

 parameter.

e. The temperature is not in the dead-band between the



parameter and the



parameter (in this case, previous state will be retained).

4. The customer thermostat is properly hooked up the input strip 1TB3, and is requesting cooling input (V1) based on the customer cooling setpoint being lower than the space temperature.

Heating

In general, the (CSTI) changeover function will provide heating if:

A unit is factory-configured with a changeover coil

(cooling/heating) as the only coil or as the main coil portion.

2. SW3 on the CSTI adapter board is turned on, and the



parameter set to





to use the changeover functions.



parameter should be chosen if the unit has a changeover coil without electric heat.



parameter should be chosen if the unit has a changeover coil with electric heat. Generally, this will perform the same as the



3. The ECM engine has sensed that there is hot water available on the supply/bypass line for the changeover coil. In this case, “hot” water is determined if: a. A 10K NTC thermistor (similar to Trane part number

X13790374010) is wired properly to the engine board, through the crossover cables and CSTI adapter boards.

UV-SVN03_.book Page 60 Thursday, January 24, 2013 5:27 PM

ECM Overview and Setup

b. The input impedance of the thermistor circuit must be set correctly (the



parameter should be set to



for CSTI units).

c. The temperature sensed is higher than the

 parameter.

d. The



parameter is higher than the

 parameter.

e. The temperature is not in the dead-band between the



parameter and the



parameter (in this case, previous state will be retained).

4. The customer thermostat is properly hooked up the input strip 1TB3, and is requesting heating input (V2) based on the customer heating set point being higher than the space temperature.

5. The heating input on 1TB3 will drive the main changeover coil IF conditions 1–4 are satisfied, but will always drive the auxiliary coil valve (if present).

Electric heat will be locked out (where present) if hot water is available since SW4 will be factory set to “ON” in these units.

SW4 selects the electric heat lockout function, where we will lock out the electric heat circuit based on either:

The presence of hot water in the changeover coil section (if the



parameter is set to



2. Abnormal behavior of the fan/s (if the



parameter is set to



3. Or a combination of both the presence of hot water or abnormal behavior of the fan/s (if the



parameter is set to



4. The preceding three examples depend on the inference of the engine board that hot water is present.

In this case, “hot” water is determined if: a. The temperature sensed is higher than the

 parameter.

b. The



parameter is higher than the

 parameter.

c. The temperature is not in the dead-band between the



parameter and the



parameter (in this case, previous state will be retained).

d. The input impedance of the thermistor circuit must be set correctly (the



parameter should be set to



for CSTI units).

Configuring the ECM Engine Board

Every Trane Fan-Coil or Cabinet Heater unit with BLDC motors will have modules specifically configured at the factory for the operation of that unit. The ECM engine configuration label is affixed to the low-voltage access lid

on the outside of the control panel (see Figure 48, p. 50

and Figure 53, p. 60 ). The ECM engine label may be on the

back-side of the low voltage access lid, depending on the unit configuration.

The serial number of each unit and the custom configuration settings specific to that unit will be printed on the label for convenient matching of labels/settings to specific units. Programming a unit with the settings from another unit will result in abnormal operation. The label contains four important sections:

How to enter the configuration menu

2. The description and meaning of the Error Codes

3. The description and meaning of the status display

4. The parameter names and values specific to that unit

Figure 53.

ECM engine label

Note: This label is provided for reference only, as an example, and should not be used to configure the unit.

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Configuration Settings of the ECM Engine

Board

WARNING

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

All settings take effect immediately, including fan startup and enabling of electric heat. Caution should be taken to stay clear of hazardous voltages, moving parts and electric heat elements while making adjustments to the ECM engine board. If it is not practical to stay clear of these areas during adjustment of the ECM engine board, please contact Trane Global Parts for configuration kit that allows easy powering of the engine board outside of the unit with a 9V battery.

The adapter boards contain high voltage. Configuration adjustments to the ECM engine board should be made through the SMALLER of the two low-voltage lids on the front of the control panel, through the low-voltage insulation/shielding.

ECM Overview and Setup

3. If the format setting for rpm values are not correct (i.e., not four-digit: XXXX), please check the operation mode of the ECM engine board signal output format



and





and



and motor

CAUTION

Burn Hazard!

NOTICE:

Equipment Damage!

Do not change the PWM output voltage settings as motor damage could occur.

Note: The engine board functions and unit specific settings are summarized on the ECM engine configuration label affixed to the back side of the control panel low voltage lid, on every unit.

The following table lists the parameter names and typical settings of the ECM engine board, for reference only.

Additional Notes:

This list is applicable only to Fan-coil and Force-Flo products.

2. Do not change the electric heat protection settings if your unit has electric heat.

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ECM Overview and Setup

Table 13. Configuration settings of the ECM engine board

Description on

Unit Label

Mtr 1 High Spd

Mtr 1 Med Spd

Mtr 1 Low Spd

EHStg1 Mtr1 Spd

EH Stg 2 Mtr 1 Spd

AI High Spd Mtr 1

AI Low Spd Mtr 1

Mtr 2 Hgh Spd

Mtr 2 Med Spd

Mtr 2 Low Spd

EHStg1 Mtr2 Spd

EH Stg 2 Mtr 2 Spd

AI High Spd Mtr 2

AI Low Spd Mtr 2

Op Mode Mtr 1

Op Mode Mtr 2

Mtr 1 Out Format

Mtr 2 Out Format

Mtr 1/2 PWM Freq.

Mtr 1 PWM Volt

Mtr 2 PWM Volt

Mt1 Hgh PWM Lt

Mt1 Low PWM Lt

Mt2 Hgh PWM Lt

Mt2 Low PWM Lt

Mt1 Ovspd RPM

User

Interface

Name









Typical

User

Interface

Value









Description

Sets the high-speed rpm for Motor 1.

Sets the medium-speed rpm for Motor 1.

Sets the low-speed rpm for Motor 1.

















Assigns an rpm to be associated with a call for 1 st stage electric heat, for Motor 1 (only on units equipped with electric heat).

Assigns an rpm to be associated with a call for 2 nd stage electric heat, for Motor 1

(only on electric heat equipped units).

Sets the maximum rpm for Motor 1 for the maximum input value of the analog input.

Sets the minimum turn-on rpm for

Motor 1, when the analog input becomes active.

Sets the high-speed rpm for Motor 2.

Sets the medium-speed rpm for Motor 2.





















































Sets the low-speed rpm for Motor 2.

Assigns an rpm to be associated with a call for 1 st stage electric heat, for Motor 2 (only on electric heat equipped units).

Assigns an rpm to be associated with a call for 2 nd stage electric heat, for Motor 2

(only on electric heat equipped units).

Sets the maximum rpm for Motor 2 for the maximum input value of the analog input.

Sets the minimum turn-on rpm for

Motor 2, when the analog input becomes active.

Sets the operational mode for Motor 1.

Sets the operational mode for Motor 2.

Sets the interface type for Motor 1.

Sets the interface type for Motor 2

Sets the PWM frequency, for cases when the PWM outputs are used.

Sets the PWM voltage, for cases when the

PWM outputs are used.

Sets the PWM voltage, for cases when the

PWM outputs are used.

Sets the maximum output % that the controller will request from Motor 1.

Sets the minimum maximum output % that the controller will request from

Motor 1.

Sets the maximum output % that the controller will request from Motor 2.

Sets the minimum maximum output % that the controller will request from

Motor 2.

Selects the rpm above which the Motor 1 will be assumed to be in an overspeed condition and will need to be shut down.

Notes:

These notes are provided for reference only, and the ECM engine label must be used as the ultimate guide for setting up an engine board on specific units.

Do not exceed 1700 rpm.

Do not set under 450 rpm.

On units with two motors, the single shafted motor is designated as Motor 1.

If the unit has only one motor, all seven speed settings for the second motor (















) should be set to zero.

Analog inputs below the



setting will be rejected.

Note:









settings are locked out on units with electric heat.

Must be set to



for fan-coil products.

Must be set to



for fan-coil products.

Must be set to



for fan-coil products.

Must be set to



for fan coil products.

On fan-coil units, the



must not be changed.

This setting must NOT be changed, as damage to the motor may occur!

This envelope protection value should not be altered.

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ECM Overview and Setup

Table 13. Configuration settings of the ECM engine board (continued)

Description on

Unit Label

Mt2 Ovspd RPM

Fan Proving Fct

AI Boost Amp

AI Floor

PulsePerRev

P Value Mtr 1

I Value Mtr 1

P Value Mtr 2

I Value Mtr 2

Ht Sens Mk Val F

Ht Sens Bk Val F

Ht Sens Resistor

Mt 1 Ramp %/sec

Mt 2 Ramp %/sec

EH Rmp Accel

Ramp MAX Time

EH Fan off delay

Lck Rtr Protect

























 .



 .



 .



 .

















User

Interface

Name



Typical

User

Interface

Value

















 .







Description

Selects the rpm above which the Motor 2 will be assumed to be in an overspeed condition and will need to be shut down.

Selects which mode should be assigned to the Binary output circuit, depending on unit type.

Boosts or attenuates the analog input signal to compensate for long wire runs.

Notes:

These notes are provided for reference only, and the ECM engine label must be used as the ultimate guide for setting up an engine board on specific units.

This envelope protection value should not be altered.

This setting has to be correct for proper unit operation of electric heat and changeover units.

A value of



should be used if no voltage level compensation is needed (i.e., voltage peak is at

10 Vdc).

Rejects noise on the analog input lines and sets up the engine board to turn on if the thermostat or controller is commanding its analog outputs on.

Sets up the tachometer function to be compatible with the on-board motor and for correct speed calculation and calibration.

Sets up the on board closed loop control to control Motor 1 with proper stability.

Sets up the on board closed loop control to control Motor 2 with proper stability.

Sets the make value for the engine board triac output based on the thermistor input.

Sets the break value for the engine board triac output based on the thermistor input.

Sets the input impedance of the thermistor input.

Sets the ramp rate for Motor 1, in % per second.

Sets the ramp rate for Motor 2, in % per second

Sets the acceleration factor for the electric heat inputs.

Sets the maximum ramp time for both

Motor 1 and Motor 2 (in seconds).

Selects how long the fan needs to stay on after an electric heat request has been turned off.

Selects whether to use the on-board locked rotor protection function.

Do not change this setting as this is critical to proper unit operation.

Do not change this setting.

Operation also depends on





, and



settings.

Operation also depends on





, and



settings.

Should be pre-set to “OUT” for Tracer ZN controllers.

Is used to force faster ramps when electric heat is requested.

Overrides the ramp rates



and



if the calculated ramp time exceeds

Not used on fan-coil unit.



This will shut down the affected motor, if rotational response is not detected.

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ECM Overview and Setup

Table 13. Configuration settings of the ECM engine board (continued)

Description on

Unit Label

Protect Funct

Rmp dft (auto rst)

Soft Rev

User

Interface

Name







Typical

User

Interface

Value



Description

This function protects settings on the board that affect the safety of the electric heat system.

 This function shortens the ramps for faster unit commissioning and auto-resets to off after approximately 15 minutes of poweron operation.

 .

 Displays the software version.

















Notes:

These notes are provided for reference only, and the ECM engine label must be used as the ultimate guide for setting up an engine board on specific units.

Do NOT change this setting. This setting locks out the following parameters from being changed, for safe operation of the unit.











To aid in commissioning of the unit, for approximately 10–15 minutes, the ramps will be shortened to quickly observe proper unit behavior and response to speeds.

Fan Speed Response Verification

After performing controller specific commissioning, observe the display on the ECM engine board with the power on, to the unit. The ECM engine display should display a looping status indicator as follows:



 →



→  →  →  →  → 

 →





→ 

Notes:

• The



indicator is unit-specific and may indicate

“Off” at this point; refer to thermistor function for more information.

• A representative fan speed of “1050” rpm are shown in the following example. Each unit is factory-configured differently and will have different settings for different fan speeds.

2. While the unit remains on, exercise the fan controls on the unit, either directly or indirectly through request for unit heat/cool. Observe the fan spinning, and then observe the fan display on the ECM engine board. It should display a looping status indicator as follows:

For a size 075 or 100 unit (using typical unit operating fan speeds):



→



 →







→  → 

 →  → 

For a size 125 or 150 unit (using typical unit operating fan speeds):



 →



→  →  →  → 

 → 

 → 

→ 

Note: The



indicator is unit-specific and may indicate “Off” at this point; refer to thermistor function for more information.

3. OPTIONAL:

While the fan is running, if practical, change the fan speeds and observe the display temporarily indicate:



Exercise all fan speeds to ensure positive unit response and to validate any field wiring.

Congratulations! Your new Trane BLDC Engine/Motor system is performing properly.

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Time Clock

Setting the Time Clock

The Time Clock must be programmed for the unit to operate. If not programmed, the unit may not run in the correct occupied/unoccupied state until timing instructions are received from the Time Clock.

Note: Power must be supplied to the unit for the time clock to be set.

The following procedure covers:

• setting the time format

• setting the current time and day

• setting the program ON / OFF settings (events)

• pre set program selections

• deleting programs

• daylight savings setting

• overriding programs (manually)

Figure 54.

Time clock

Set the Time Format, Time, and Day

(Program to 24 hr or am/pm format.)

Press the Menu button until the display screen is blank

(time not showing) and 24h or am/pm is blinking in the upper left corner of the screen.

2. Use the + and/or - buttons to select the desired setting and then press OK.

3. The hour display begins to blink—use the + and/or - buttons to select the desired setting and then press

OK.

4. The minute display begins to blink—use + / - to select the desired setting and press OK.

5. The day display (on the left side of the display screen) begins to blink—use + / - to select the desired setting and press OK.

Set the Program

Note: The Time Clock should be used to program the unit for the UNOCCUPIED mode—the periods of time when the unit will not be in operation. The mode you are programming is shown on the LED display:

: The Timer is in operation (ON). The unit is in

UNOCCUPIED mode.

: The Timer is not in operation (OFF). The unit is in OCCUPIED mode.

Note: Odd number programs activate the timer ON function (the unit is in UNOCCUPIED mode) and even number programs activate the timer OFF function (the unit is in OCCUPIED mode).

Set the Switching ON Time

Figure 55.

Setting the switching ON time

Time format display

2. Day display

3. LED display

The time clock (see

Figure 54 ) is located behind the access

door of a Unit Ventilator.

Reset the Time Clock

To clear any programs that may exist from the factory, press the reset button (Res.).

Note: The time clock uses Standard Time. If you are programming during Daylight Savings Time, one hour should be subtracted from times needed (see

“Daylight Savings Time,” p. 66

For example, if the Daylight Savings Time is 2:30, the time setting for the clock should be 1:30.

Press OK until prog 01 is visible on the LED display

(see Figure 55 ).

Note: When prog 01 is visible, 01 should be blinking and the ON symbol, , should be displayed in the LED window. Press OK again.

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Time Clock

2. The hour display begins to blink—use the + and/or - buttons to select the desired setting and then press

OK.

3. The minute display begins to blink—use + / - to select the desired setting and press OK.

4. The day display (on the left side of the display screen) begins to blink—use + / - to select the desired setting and press OK.

Note: After you set the switching ON time, the prog number should increase by one (for example, from

prog 01 to prog 02). The number should be blinking and the OFF symbol, , should be displayed in the LED window. Set the switching

OFF time.

Set the Switching OFF Time

The hour display begins to blink—use the + and/or - buttons to select the desired setting and then press

OK.

2. The minute display begins to blink—use + / - to select the desired setting and press OK.

3. The day display (on the left side of the display screen) begins to blink—use + / - to select the desired setting and press OK.

Note: Repeat the steps for setting the switching ON/OFF times for each additional programming needed.

You can set a maximum of 20 times: 10 switching

ON times, and 10 switching OFF times.

Preset Program Selections

When selecting daily programming, preset selections can be used (see

Figure 56

Figure 56.

Preset program selection options

•

Press the +1h button (see Figure 57

) to add 1 hour to the current time. Press the +1h button again to subtract

1 hour from the current time.

Figure 57.

Daylight Savings Time

Override Program (Manual)

To override the program, press the OVR (+) button (see

Figure 58

Toggle between the unoccupied and occupied states by pressing the OVR (+) button.

Figure 58.

Manual program override

Note: When you override the program, the override remains in effect until the next programming event or until you press OVR again.

Deleting Programs

Press the Menu button and then press OK until the ON hour time display of the program you want to delete is blinking.

2. Use the + / - to select -- and then press OK.

Important: Switching programs must be deleted in

ON-OFF pairs. When you delete a single ON instruction, you must also delete the corresponding OFF instruction.

Daylight Savings Time

Note: Use +1h button to make the change to and from

Daylight Savings Time.

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Wired Controllers—Communication Wiring

Wiring Installation (ZN520)

Tracer ZN520 controllers are LonTalk ® devices that interface with the Trane Tracer Summit building management system. Reference the unit wiring diagram or submittals.

Ground shields at each Tracer ZN520, taping the opposite end of each shield to prevent any connection between the shield and anther ground. Refer to the most recent version of Trane publication CNT-SVX04A-EN (Tracer ZN520 Unit

Controller: Installation, Operation and Programming

Guide) for the communication wiring diagram.

Communication wire must conform to the following specification:

Shielded twisted pair 18 AWG

2. Capacitance 23 (21–25) picofarads (pF) per foot

3. Listing/Rating—300 V 150C NEC 725-2 (b) Class 2 Type

CL2P

4. Trane Part No. 400-20-28 or equivalent, available through Trane BAS Buying Group Accessories catalog.

Note: Communication link wiring is a shielded, twisted pair of wire and must comply with applicable electrical codes.

Follow these general guidelines when installing communication wiring on units with a Tracer ZN520 controller:

• Maintain a maximum 5000 ft. aggregate run.

• Install all communication wiring in accordance with the NEC and all local codes.

• Solder the conductors and insulate (tape) the joint sufficiently when splicing communication wire. Do not use wire nuts to make the splice.

• Do not pass communication wiring between buildings because the unit will assume different ground potentials.

• Do not run power in the same conduit or wire bundle with communication link wiring.

Note: You do not need to observe polarity for LonTalk communication links.

Device Addressing

LonTalk devices are given a unique address by the manufacturer. This address is called a Neuron ID. Each

Tracer ZN520 controller can be identified by its unique

Neuron ID, which is printed on a label on the controller’s logic board. The Neuron ID is also displayed when communication is established using Tracer Summit or

Rover service tool. The Neuron ID format is

00-01-64-1C-2B-00.

Wire Characteristics

Controller communication-link wiring must be low capacitance, 18-gage, shielded, twisted pair with stranded, tinned-copper conductors. For daisy chain configurations, limit the wire run length to 5,000 ft. Truck and branch configurations are significantly shorter. LonTalk wire length limitations can be extended through the use of a link repeater.

Recommended Communication Wiring

Practices

The following guidelines should be followed while installing communication wire.

• LonTalk is not polarity sensitive. Trane recommends that the installer keep polarity consistent throughout the site.

• Only strip away two inches maximum of the outer conductor of shielded cable.

• Make sure that the 24 Vac power supplies are consistent in how they are grounded. Avoid sharing

24 Vac between LonTalk UCMs.

• Avoid over-tightening cable ties and other forms of cable wraps. A tight tie or wrap could damage the wires inside the cable.

• Do not run LonTalk cable alongside or in the same conduit as 24 Vac power.

• In an open plenum, avoid lighting ballasts, especially those using 277 Vac.

• Do not use a trunk and branch configuration, if possible. Trunk and branch configurations shorten the distance cable can be run.

Wiring Installation (Tracer UC400)

This section provides information about wiring the UC400 controller. For more detailed information, refer to BAS-

SVX02D-EN (Installation, Operation, and Maintenance:

Tracer UC400 Programmable Controller), or the most recent revision.

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Wired Controllers—Communication Wiring

Wiring Overview Outline

General

Instructions

(

p. 68 )

BACnet MS/TP

Link

Power Supply

Setting the

Address ( p. 68 )

Wiring

Requirements

(

p. 70

)

Connection

Wiring ( p. 69

)

Power ON Check

(

p. 70

)

General Instructions

Conformance to Regulatory Standards

All wiring must comply with the National Electrical Code™

(NEC™) and local electrical codes.

Connecting Wires to Terminals

To connect wires to the UC400 controller or the expansion modules:

Strip the wires to expose 0.28 inch (7 mm) of bare wire.

2. Insert the wire into a terminal connector.

3. Tighten the terminal screw to 0.5 to 0.6 N-m (71 to

85 ozf-in or 4.4 to 5.3 lbf-in.).

4. Tug on the wires after tightening the screws to ensure all wires are secure as shown on the right.

BACnet MS/TP Link

Setting the Address

The rotary address dials on the UC400 controller serve one or two purposes depending upon the network: they are always used for the MAC Address, which is sometimes all

68 or part of the BACnet Device ID (refer to the illustration below).

IMC

VAC

XFRM

AO1

BI 4

AO2

BI 5

UI 1 UI 2

P 1 P 2

LINK IMC

SERVICE

SERVICE TOOL

0 x100

ADDRESS

0 0 x10 x1

BO1 BO2 BO3 BO4 BO5 BO6 BO7 BO8 BO9

BO1

NC C NO

RELAYS

BO2

NC C NO

BO3

NC C

CONNECT AC POWER TO THE TRAIC SUPPLY TO POWER THE TRIACS

TRIAC SUPPLY

A B

BO4 BO5 BO6

TRIACS

BO7 BO8

BO9

Use a 1/8 inch (3.2 mm) flathead screwdriver to set rotary address dials. Dials rotate in either direction.

MAC Address.

The MAC Address is required by the RS-

485 communication protocol on which BACnet operates. A

UC400 controller can use a MAC Address from 001 to 120.

Important: Each device on the link must have a unique

MAC Address/Device ID. The controller rotary addresses should be sequentially set, with no gaps in the numbering, starting with

001 on each link (for example 001, 002, 003,

004 and so on). A duplicate address or a 000 address setting will interrupt communications and cause the Tracer SC device installation process to fail.

BACnet Device ID.

The BACnet Device ID is required by the BACnet network. Each device must have a unique number from 001 to 4094302.

BACnet networks without a Tracer SC system controller

On BACnet networks without a Tracer SC system controller, the Device ID can be assigned one of two ways:

• It can be the same number as the MAC Address, determined by the rotary address dials on the UC400 controller. For example, if the rotary address dials are set to 042, both the MAC Address and the BACnet

Device ID are 042.

• It can be soft set using the Tracer TU service tool. If the

BACnet Device ID is set using the Tracer TU service tool, the rotary address dials only affect the MAC

Address, they do not affect the BACnet Device ID.

BACnet networks with a Tracer SC system controller

On BACnet networks with a Tracer SC system controller, the Device ID for the UC400 controller is always soft set by the system controller using the following scheme illustrated below.

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Note: The BACnet Device ID is displayed as the Software

Device ID on the Tracer TU Controller Settings page in the Protocol group.

UC400

VDC

AI AI AI

LINK

IMC

P P

LINK IM

SERVI

SERVICE TOOL

UC400

VDC

AI AI AI

LINK

IMC

P P

LINK IM

SERVI

SERVICE TOOL

UC400

VDC

AI AI AI

LINK

IMC

P P

LINK IM

SERVI

SERVICE TOOL

UC400

Wired Controllers—Communication Wiring

Power Supply

Please read all of the warnings, cautions, and notices below before proceeding with this section.

WARNING

Hazardous Voltage!

8 8

56 56

0 1

2 2

4 4

ADDRESS

0 1

2 2

4 4

8 8

56 56

4 4

2 2

Tracer SC

Zone

Sensor

8 8

56 56

4 4

2 2

ADDRESS

0 1

2 2

4 4

8 8

56 56

4 4

2 2

BACnet

Device ID for this UC400

= 0012001

The first three digits are determined by the address rotary dials on the Tracer SC system controller.

The fourth digit is determined by the link number to which the

UC400 controller is attached.

The last three digits are determined by the rotary address dials on the UC400 controller.

Connection Wiring

Field-supplied BACnet MS/TP link wiring must be installed in compliance with NEC and local codes. The wire must be low-capacitance, 18-gauge, stranded, tinned-copper, shielded, twisted-pair. The illustration below shows an example of BACnet link wiring with multiple UC400 controllers.

Note: For more details, refer to Wiring Guide: Unit

Controller Wiring for the Tracer SC™ System

Controller (BAS-SVN03D-EN, or the most recent revision).

Zone

Sensor

Zone

Sensor

Zone sensor communications jack wiring

CAUTION

Personal Injury and Equipment Damage!

After installation, make sure to check that the 24 Vac transformer is grounded through the controller. Failure to check could result in personal injury and/or damage to equipment. Measure the voltage between chassis ground and any ground terminal on the UC400 controller. Expected result: Vac £ 4.0 V

NOTICE:

Avoid Equipment Damage!

Sharing 24 Vac power between controllers could cause equipment damage.

A separate transformer is recommended for each UC400 controller. The line input to the transformer must be equipped with a circuit breaker sized to handle the maximum transformer line current.

If a single transformer is shared by multiple UC400 controllers:

• The transformer must have sufficient capacity.

• Polarity must be maintained for every UC400 controller powered by the transformer.

Important: If the polarity is inadvertently reversed between two controllers powered by the same transformer, a difference of 24Vac will occur between the grounds of each controller, which can result in:

• Partial or full loss of communication on the entire BACnet MS/TP link

• Improper function of the UC400 controller outputs

• Damage to the transformer or a blown transformer fuse

Trane BACnet

Terminator

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Wired Controllers—Communication Wiring

Transformer Recommendations

A 24Vac power supply must be used for proper operation of the binary inputs, which requires 24Vac detection. In addition, the spare 24Vac outputs may be used to power relays and TRIACS.

• AC transformer requirements: UL listed, Class 2 power transformer, 24Vac ±15%, device max load 24VA. The transformer must be sized to provide adequate power to the controller (12VA) and outputs (maximum 12VA

per binary output).

• CE-compliant installations: The transformer must be

CE marked and SELV compliant per IEC standards.

Wiring Requirements

To ensure proper operation of the UC400 controller, install the power supply circuit in accordance with the following guidelines:

• A dedicated power circuit disconnect switch must be near the controller, easily accessible by the operator, and marked as the disconnecting device for the controller.

• 18 AWG (0.823 mm 2 ) copper wire is recommended for the circuit between the transformer and the controller.

Important: The controller must receive AC power from a dedicated power circuit; failure to comply

may cause the controller to malfunction. DO

NOT run AC power wires in the same wire bundle with input/output wires; failure to comply may cause the controller to malfunction due to electrical noise.

Connecting Wires

To connect the wires:

Disconnect power to the transformer.

2. Connect the 24Vac secondary wires from the transformer to the 24Vac and terminals on the

UC400 controller (refer to the illustration below).

3. Do one of the following to ensure the controller is adequately grounded:

• Connect a grounding pigtail at some point along the secondary wire that runs between the controller terminal and the transformer.

• Ground one of the terminals on the controller to the enclosure (if the enclosure is adequately grounded) or to an alternate earth ground.

24Vac transformer

A pigtail connection may be necessary between earth ground and/or enclosure ground if the device is not grounded through one leg of the transformer wiring.

IMC

Alternate ground method.

VAC

XFRM

AO1

BI 4

VAC

AO2

BI 5

VAC

UI 1

BI 1

UI 2

BI 2

AI 1

BI 3

AI 2 AI 3 AI 4

LINK

AI 5

IMC

+ 24

VDC

IMC

LINK IMC

SERVICE

SERVICE TOOL

ADDRESS

BO1 BO2 BO3 BO4 BO5 BO6 BO7 BO8 BO9 x1

BO1

NC C NO

RELAYS

BO2

NC C NO

BO3

NC C

CONNECT AC POWER TO THE TRAIC SUPPLY TO POWER THE TRIACS

TRIAC SUPPLY

A B

BO4 BO5 BO6

TRIACS

BO7 BO8

BO9

Power ON Check

To perform a Power ON check:

Verify that the 24Vac connector and the chassis ground are properly wired.

2. Remove the lockout/tagout from the line voltage power to the electrical cabinet.

3. Energize the transformer to apply power to the UC400 controller.

4. Observe the UC400 controller when power is applied to verify the power check sequence as follows: a. The power LED lights red for 1 second b. The power LED lights green

• If the sequence above is completed as described, the controller is properly booted and ready for the application code.

If the power LED flashes red, a fault condition exists.

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Pre-Start

Pre-Start-up Checklist

Before energizing the unit, the following system devices must be checked:

 Is the high voltage power supply correct and in accordance with the nameplate ratings?

 Is the field wiring and circuit protection the correct size?

 Is the low voltage control circuit wiring correct per the unit wiring diagram?

 Is the piping system clean/complete and correct?



Is unit serviceable? (See “Dimensions and Weights,” p. 11 .)

 Are all the unit access panels secure and in place?

 Is the water flow established and circulating through all the units?

 Is the condensate line properly sized, run, trapped and pitched?

 Does the indoor blower turn freely without rubbing?

 Has all work been done in accordance with applicable local and national codes?

 Has heat transfer fluid been added in the proper mix to prevent freezing if required?

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Startup

Tracer ZN520 Unit Startup

Refer to the most recent version of Trane publication CNT-

SVX04A-EN (Tracer ZN520 Unit Controller: Installation,

Operation and Programming Guide). The factory preprograms the ZN520 with default values to control the temperature and unit airflow. Use Tracer Summit building automation system or Rover™ software to change the default values.

Follow the procedure below to operate the ZN520 in a stand-alone operation:

Turn power on at the disconnect switch option.

2. Position the fan mode switch to either high, medium, low, or the auto position.

3. Rotate the setpoint dial on the zone sensor module to

55°F for cooling or 85°F for heating.

The appropriate control valve will actuate assuming the following conditions:

Room temperature should be greater than 55°F and less than 85°F.

2. For a 2-pipe fan-coil unit with an automatic changeover sensor, the water temperature input is appropriate for the demand placed on the unit. For example, cooling operation is requested and cold water (5° lower than room temperature) flows into the unit.

3. Select the correct temperature setpoint.

Note: Select and enable zone sensor temperature settings to prevent freeze damage to unit.

Tracer UC400 Unit Startup

Refer to the most recent version of Trane publication BAS-

SVX48B-EN (Installation, Operation, and Programming:

Tracer UC400 Programmable Controller) for Tracer UC400 unit ventilator. The factory pre-programs the Tracer UC400 unit ventilator with default values to control the temperature and unit airflow. Use Tracer SC building automation system or Tracer TU software to change the default values.

Follow the procedure below to operate the Tracer UC400 in a stand-alone operation:

Turn power on at the disconnect switch option.

2. Position the fan mode switch to either high, medium, low, or the auto position.

3. Rotate the setpoint dial on the zone sensor module to

55°F for cooling or 85°F for heating.

The appropriate control valve will actuate assuming the following conditions:

Room temperature should be greater than 55°F and less than 85°F.

2. For a 2-pipe fan-coil unit with an automatic changeover sensor, the water temperature input is appropriate for the demand placed on the unit. For example, cooling

72 operation is requested and cold water (5° lower than room temperature) flows into the unit.

3. Select the correct temperature setpoint.

Note: Select and enable zone sensor temperature settings to prevent freeze damage to unit.

General Information

Manual Fan Speed Switch

The manual fan mode switch is available with a fourposition switch (off-hi-med-lo) allows manual fan mode selection and is available unit- or wall-mounted. See

Figure 59

Figure 59.

Fan speed switch

The fan speed switch can be used to provide simultaneous fan speed customer requests in addition to external controller fan speed request. The wall-mounted option is low-voltage and has three 24-volt relays using a factorywired transformer and relays to control the fan motor.

Fan Mode Switch Operation

Off

Fan is turned off, two-position damper option springreturns closed.

Hi, Med, Lo

Fan runs continuously at the selected speed. The twoposition damper option opens to an adjustable mechanical stop position.

Tracer ZN520 Operation

Off

Fan is off; control valve options and fresh air damper options close. The low air temperature detection option is still active.

Auto

Fan speed control in the auto setting allows the modulating (3-wire floating point) or 2–position control valve option and three-speed fan to work cooperatively to meet precise capacity requirement, while minimizing fan

UV-SVN03F-EN

UV-SVN03_.book Page 73 Thursday, January 24, 2013 5:27 PM speed (motor/energy/acoustics ) and valve position (pump energy, chilled water reset ). As the capacity requirement increases at low fan speed, the water valve opens. When the low fan speed capacity switch point is reached, the fan switches to medium speed and the water valve repositions to maintain an equivalent capacity. The reverse sequence takes place with a decrease in required capacity.

Low/Med/High

The fan runs continuously at the selected speed and the valve option will cycle to meet setpoint.

UC400 Controller Operation

Off

Fan is off; control valve options and fresh air damper options close. The low air temperature detection option is still active.

Auto

Fan speed control in the auto setting allows the modulating (3-wire floating point) or 2-position control valve option and 1-, 2-, 3- or variable-speed fan to work cooperatively to meet precise capacity requirement, while minimizing fan speed (motor/energy/acoustics) and valve position (pump energy, chilled water reset). As the capacity requirement increases, the water valve opens.

When the fan speed capacity switch points are reached, the fan speed ramps up and the water valve repositions to maintain an equivalent capacity. The reverse sequence takes place with a decrease in required capacity.

Low/Med/High

The fan runs continuously at the selected speed and the valve option will cycle to meet setpoint.

Startup

Tracer ZN520 Sequence of

Operation

The Tracer ZN520 operates the fan in the following modes:

occupied

2. unoccupied

3. occupied standby

4. occupied bypass

5. Tracer Summit with supply fan control

Occupied (Tracer ZN520)

When the controller is in the occupied mode, the unit attempts to maintain the space temperature at the active occupied heating or cooling setpoint, based on the measured space temperature, the discharge air temperature, the active setpoint, and the proportional/ integral control algorithm. The modulating control algorithm used when occupied or in occupied standby is described in the following sections. Additional information related to the handling of the controller setpoints can be found in the previous Setpoint operation section.

Unoccupied Mode (Tracer ZN520)

When the controller is in the unoccupied mode, the controller attempts to maintain the space temperature at the stored unoccupied heating or cooling setpoint, based on the measured space temperature, the active setpoint and the control algorithm, regardless of the presence of a hard-wired or communicated setpoint. Similar to other configuration properties of the controller, the locally stored unoccupied setpoints can be modified using Rover service tool.

In unoccupied mode, a simplified zone control algorithm is run. During the cooling mode, when the space temperature is above the cool setpoint, the primary cooling capacity operates at 100 percent. If more capacity is needed, the supplementary cooling capacity turns on (or opens to 100 percent). During the heating mode, when the space temperature is below the heat setpoint, the primary heating capacity turns on. All capacity is turned off when the space temperature is between the unoccupied cooling and heating setpoints. Note that primary heating or cooling capacity is defined by unit type and whether heating or cooling is enabled or disabled. For example, if the economizer is enabled and possible, it will be the primary cooling capacity. If hydronic heating is possible, it will be the primary heating capacity.

Occupied Standby Mode (Tracer ZN520)

The controller can be placed into the occupied standby mode when a communicated occupancy request is combined with the local (hard-wired) occupancy binary input signal. When the communicated occupancy request is unoccupied, the occupancy binary input (if present)

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Startup

does not affect the controller’s occupancy. When the communicated occupancy request is occupied, the controller uses the local occupancy binary input to switch between the occupied and occupied standby modes.

During occupied standby mode, the controller’s economizer damper position goes to the economizer standby minimum position. The economizer standby minimum position can be changed using Rover service tool.

In the occupied standby mode, the controller uses the occupied standby cooling and heating setpoints. Because the occupied standby setpoints typically cover a wider range than the occupied setpoints, the Tracer ZN520 controller reduces the demand for heating and cooling the space. Also, the outdoor air economizer damper uses the economizer standby minimum position to reduce the heating and cooling demands.

When no occupancy request is communicated, the occupancy binary input switches the controller’s operating mode between occupied and unoccupied. When no communicated occupancy request exists, the unit cannot switch to occupied standby mode.

Occupied Bypass Mode (Tracer ZN520)

The controller can be placed in occupied bypass mode by either communicating an occupancy request of Bypass to the controller or by using the timed override On button on the Trane zone sensor.

When the controller is in unoccupied mode, you can press the On button on the zone sensor to place the controller into occupied bypass mode for the duration of the bypass time (typically 120 minutes).

Occupancy Sources (Tracer ZN520)

There are four ways to control the controller’s occupancy:

• Communicated request (usually provided by the building automation system or peer device)

• By pressing the zone sensor’s timed override On button

• Occupancy binary input

• Default operation of the controller (occupied mode)

A communicated request from a building automation system or another peer controller can change the controller’s occupancy. However, if communication is lost, the controller reverts to the default operating mode

(occupied) after 15 minutes (configurable, specified by the

“receive heartbeat time”), if no local hard-wired occupancy signal exists.

A communicated request can be provided to control the occupancy of the controller. Typically, the occupancy of the controller is determined by using time-of-day scheduling of the building automation system. The result of the time-of-day schedule can then be communicated to the unit controller.

Tracer Summit with Supply Fan Control

(Tracer ZN520)

If the unit is communicating with Tracer Summit and the supply fan control programming point is configured for

Tracer (the factory configures as local), Tracer Summit will control the fan regardless of the fan mode switch position.

When the fan mode switch is set to Off or when power is restored to the unit, all Tracer ZN520 lockouts (latching diagnostics) are manually reset. The last diagnostic to occur is retained until the unit power is disconnected.

Refer to Trane publication, CNT-SVX04A-EN (Tracer ZN520

Unit Controller: Installation, Operation and Programming

Guide) for specific instructions regarding the procedure for running the Tracer ZN520.

Cooling Operation (Tracer ZN520)

The heating and cooling setpoint high and low limits are always applied to the occupied and occupied standby setpoints. During the cooling mode, the Tracer ZN520 controller attempts to maintain the space temperature at the active cooling setpoint. Based on the controller’s occupancy mode, the active cooling setpoint is one of the following:

• Occupied cooling setpoint

• Occupied standby cooling setpoint

• Unoccupied cooling setpoint

The controller uses the measured space temperature, the active cooling setpoint, and discharge air temperature along with the control algorithm to determine the requested cooling capacity of the unit (0 percent–

100 percent). The outputs are controlled based on the unit configuration and the required cooling capacity. To maintain space temperature control, the Tracer ZN520 cooling outputs (modulating hydronic valve, two-position hydronic valve, or outdoor air economizer damper) are controlled based on the cooling capacity output.

The cooling output is controlled based on the cooling capacity. At 0 percent capacity, all cooling capacities are off and the damper is at minimum position. Between

0 percent and 100 percent capacity, the cooling outputs are controlled according to modulating valve logic

(modulating valves) or cycled on (2-position valves). As the load increases, modulating outputs open further and binary outputs are energized longer. At 100 percent capacity, the cooling valve or damper is fully open

(modulating valves) or on continuously (and 2-position valves).

Unit diagnostics can affect fan operation, causing occupied and occupied standby fan operation to be defined as abnormal. Refer to

“Troubleshooting (Wireless

Controls),” p. 96 for more information about abnormal fan

operation.

The Tracer ZN520 controller operates the supply fan continuously when the controller is in the occupied and occupied standby modes, for either heating or cooling.

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The controller only cycles the fan off with heating and cooling capacity in the unoccupied mode.

The economizer is used for cooling purposes whenever the outdoor temperature is below the economizer enable setpoint and there is a need for cooling. The economizer is used first to meet the space demand, and other forms of cooling are used if the economizer cannot meet the demand alone. See modulating outdoor air damper operation for additional information.

Cascade cooling control initiates a discharge air tempering function if the discharge air temperature falls below the discharge air temperature control low limit, all cooling capacity is at minimum, and the discharge control loop determines a need to raise the discharge air temperature.

The controller then provides heating capacity to raise the discharge air temperature to its low limit.

Discharge Air Tempering (Tracer ZN520)

The discharge air tempering function enables when cold outdoor air is brought in through the outdoor air damper, causing the discharge air to fall below the discharge air temperature control low limit. The controller exits the discharge air tempering function when heat capacity has been at 0 percent for five minutes.

Heating Operation (Tracer ZN520)

During heating mode, the Tracer ZN520 controller attempts to maintain the space temperature at the active heating setpoint. Based on the occupancy mode of the controller, the active heating setpoint is one of the following:

• Occupied heating

• Occupied standby heating

• Unoccupied heating

During dehumidification in the heating mode, the controller adjusts the heating setpoint up to the cooling setpoint. This reduces the relative humidity in the space with a minimum of energy usage.

The controller uses the measured space temperature, the active heating setpoint, and discharge air temperature, along with the control algorithm, to determine the requested heating capacity of the unit (0 percent–

100 percent). The outputs are controlled based on the unit configuration and the required heating capacity.

Unit diagnostics can affect the Tracer ZN520 controller operation, causing unit operation to be defined as abnormal. Refer to

“Diagnostics,” p. 90 for more

information about abnormal unit operation.

The heating output is controlled based on the heating capacity. At 0 percent capacity, the heating output is off continuously. Between 0 percent and 100 percent capacity, the heating output is controlled according to modulating valve logic (modulating valves) or cycled on

(two-position valves). As the load increases, modulating outputs open further and binary outputs are energized

UV-SVN03F-EN

Startup

longer. At 100 percent capacity, the heating valve is fully open (modulating valves) or on continuously (twoposition valves).

The Tracer ZN520 fan output(s) normally run continuously during the occupied and occupied standby modes, but cycle between high and off speeds with heating/cooling during the unoccupied mode. When in the occupied mode or occupied standby mode and the fan speed is set at the high, medium, or low position, the fan runs continuously

at the selected speed. Refer to “Diagnostics,” p. 90

for more information on abnormal fan operation.

When the unit’s supply fan is set to auto, the controller’s configuration determines the fan speed when in the occupied mode or occupied standby mode. The fan runs continuously at the configured heating fan speed or cooling fan speed. For all fan speed selections except off, the fan cycles off during unoccupied mode.

The economizer outdoor air damper is never used as a source of heating. Instead, the economizer damper (when present) is only used for ventilation; therefore, the damper is at the occupied minimum position in the occupied mode. The damper control is primarily associated with occupied fan operation.

Fan Mode Operation (Tracer ZN520)

For multiple fan speed applications, the Tracer ZN520 controller offers additional fan configuration flexibility.

Separate default fan speeds for heating and cooling modes can be configured. The fan runs continuously for requested speeds (off, high, medium, or low). When the fan mode switch is in the Auto position or a hard-wired fan mode input does not exist, the fan operates at the default configured speed. See

Table 14, p. 75 for default fan

configuration for heat and cool mode. During unoccupied mode, the fan cycles between high speed and off with heating and cooling fan modes. If the requested speed is off, the fan always remains off.

Table 14. Fan configuration (Tracer ZN520)

Heating

Cooling

Auto Fan Operation

Continuous

Fan Speed Default

Off

Low

Medium

High

Off

Low

Medium

High

During dehumidification, when the fan is on Auto, the fan speed can switch depending on the error. Fan speed increases as the space temperature rises above the active cooling setpoint.

Additional flexibility built into the controller allows you to enable or disable the local fan switch input. The fan mode request can be either hard-wired or communicated to the

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Startup

controller. When both are present, the communicated request has priority over the hard-wired input. See

Table 15

Table 16 , and Table 17

Table 15. Local fan switch enabled (Tracer ZN520)

Communicated Fan Speed

Input

Fan Switch

(Local)

Fan

Operation

Off

Low

Medium

High

Auto

Low

Medium

High

Auto

Ignored

Off

Low

Medium

High

Auto (configured default, determined by heat/cool mode)

Off

Low

Medium

High

Table 16. Fan operation in heating and cooling modes

(Tracer ZN520)

Fan Mode

Off

Low

Medium

High

Auto

Occ.

Off

Low

Med

High

Default fan sp.

Heating Cooling

Unocc.

Occ. Unocc.

Off Off

Off/high Low

Off/high Med

Off

Off/high

Off/high High

Off/high Default fan sp.

Off/high

Table 17.

Local fan switch disabled or not present (Tracer

ZN520)

Communicated Fan Speed Input Fan Operation

Off

Low

Off

Low

Medium

High

Auto (or not present)

Medium

High

Auto (fan runs at the default speed)

Continuous Fan Operation (Tracer ZN520)

During occupied and occupied standby modes, the fan normally is on. For multiple speed fan applications, the fan normally operates at the selected or default speed (off, high, medium, or low). When fan mode is auto, the fan operates at the default fan speed.

During unoccupied mode, the controller controls the fan off. While unoccupied, the controller heats and cools to maintain the unoccupied heating and cooling setpoints. In unoccupied mode, the fan is controlled on high speed only with heating or cooling.

The unit fan is always off during occupied, occupied standby, and unoccupied modes when the unit is off due to a diagnostic or when the unit is in the off mode due to

76 the local zone sensor module, a communicated request, or the default fan speed (off).

If both a zone sensor module and communicated request exist, the communicated request has priority.

Fan Cycling Operation (Tracer ZN520)

Tracer ZN520 does not support fan cycling in

occupied mode. The fan cycles between high speed and off in the unoccupied mode only. The controller’s cascade control algorithm requires continuous fan operation in the occupied mode.

Fan Off Delay (Tracer ZN520)

When a heating output is controlled off, the Tracer ZN520 controller automatically holds the fan on for an additional

30 seconds. This 30-second delay gives the fan time to blow off any residual heat from the heating source, such as a steam coil. When the unit is heating, the fan off delay is normally applied to control the fan; otherwise, the fan off delay does not apply.

Fan Start on High Speed (Tracer ZN520)

On a transition from off to any other fan speed, the Tracer

ZN520 controller automatically starts the fan on high speed and runs the fan at high speed for 0.5 seconds. This provides the ample torque required to start all fan motors from the off position.

Entering Water Temperature Sampling

Function (Tracer ZN520)

Only units using the main hydronic coil for both heating and cooling (2-pipe changeover and 4-pipe changeover units) use the entering water temperature sampling function. Two-pipe changeover and 4-pipe changeover applications allow the main coil to be used for heating and for cooling; therefore, these applications require an entering water temperature sensor.

When three-way valves are ordered with a Tracer ZN520 control, the controller is factory-configured to disable the entering water temperature sampling function, and the entering water sensor is mounted in the proper location.

Disabling entering water temperature sampling eliminates unnecessary water flow through the main coil when three-way valves are used.

The controller invokes entering water temperature sampling only when the measured entering water temperature is too cool to heat or too warm to cool.

Entering water is cold enough to cool when it is five degrees below the measured space temperature. Entering water is warm enough to heat when it is five degrees above the measured space temperature.

When the controller invokes the entering water temperature sampling function, the unit opens the main hydronic valve for no more than three minutes before considering the measured entering water temperature. An initial stabilization period is allowed to flush the coil. This period is equal to 30 seconds plus half of the valve stroke

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UV-SVN03_.book Page 77 Thursday, January 24, 2013 5:27 PM time. Once this temperature stabilization period has expired, the controller compares the entering water temperature against the effective space temperature

(either hard-wired or communicated) to determine whether the entering water can be used for the desired heating or cooling. If the water temperature is not usable for the desired mode, the controller continues to compare the entering water temperature against the effective space temperature for a maximum of three minutes.

The controller automatically disables the entering water temperature sampling and closes the main hydronic valve when the measured entering water exceeds the high entering water temperature limit (110°F). When the entering water temperature is warmer than 110°F, the controller assumes the entering water temperature is hot because it is unlikely the coil would drift to a high temperature unless the actual loop temperature was very high.

If the entering water temperature is unusable—too cool to heat or too warm to cool—the controller closes the hydronic valve and waits 60 minutes before initializing another sampling. If the controller determines the entering water temperature is valid for heating or cooling, it resumes normal heating/cooling control and effectively disables entering water temperature sampling until it is required.

Electric Heat Operation (Tracer ZN520)

The Tracer ZN520 controller supports one or two-stage electric heat operation for heating. To control the space temperature, electric heat is cycled to control the discharge air temperature. The rate of cycling is dependent upon the load in the space and the temperature of the incoming fresh air from the economizer (if any).

Two-pipe changeover units with electric heat use the electric heat only when hot water is not available.

Manual Fresh Air Damper (Tracer ZN520)

Units with the manual fresh air damper option ship with the damper in the closed position, which is adjustable from zero to 100 percent in 25 percent increments. To adjust the position, first remove the air filter to expose the damper stop screw on the control panel end. Relocate the stop screw to the appropriate position. Then loosen the stop screw wingnut and adjust the linkage.

Economizer Damper Option (Tracer ZN520)

With a valid outdoor air temperature (either hard-wired or communicated), Tracer ZN520 uses the modulating economizer damper as the highest priority source of cooling. Economizer operation is only possible through the use of a modulating damper.

Economizing is possible during the occupied, occupied standby, unoccupied, and occupied bypass modes.

The controller initiates the economizer function if the outdoor air temperature is cold enough to be used as free cooling capacity. If the outdoor air temperature is less than

UV-SVN03F-EN

Startup

the economizer enable setpoint (absolute dry bulb), the controller modulates the outdoor air damper (between the active minimum damper position and 100 percent) to control the amount of outdoor air cooling capacity. When the outdoor air temperature rises 5°F above the economizer enable point, the controller disables economizing and moves the outdoor air damper back to its predetermined minimum position based on the current occupancy mode or communicated minimum damper position.

Table 18.

Relationship between outdoor temperature sensors and damper position (Tracer ZN520)

Outdoor Air

Temp.

Modulating Outdoor Air Damper

Occupied or

Occupied

Bypass

None or invalid Open to occupied minimum position

Occupied Standby

Open to occupied standby minimum position

Unoccupied

Closed

Failed Open to occupied minimum position

Open to occupied standby minimum position

Closed

Present and economizing feasible

Present & economizing not feasible

Economizing minimum postion to

100%

Open to occupied minimum position

Economizing between occupied standby minimum position to

100%

Open to occupied standby minimum position

Open & economizing when unit is operating, closed

Closed

Dehumidification (Tracer ZN520)

Dehumidification is possible when mechanical cooling is available, the heating capacity is located in the reheat position, and the space relative humidity setpoint is valid.The controller starts dehumidifying the space when the space humidity exceeds the humidity setpoint.

The controller continues to dehumidify until the sensed humidity falls below the setpoint minus the relative humidity offset.The controller uses the cooling and reheat capacities simultaneously to dehumidify the space. While dehumidifying, the discharge air temperature is controlled to maintain the space temperature at the current setpoint.

A typical scenario involves high humidity and high temperature load of the space.The controller sets the cooling capacity to 100 percent and uses the reheat capacity to warm the discharge air to maintain space temperature control. Dehumidification may be disabled via Tracer or configuration.

Note: If the unit is in the unoccupied mode, the dehumidification routine will not operate.

Data Sharing (Tracer ZN520)

Because this controller utilizes L

ORKS®

technology, the controller can send or receive data (setpoint, heat/cool mode, fan request, space temperature, etc.) to and from other controllers on the communication link, with or

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without the existence of a building automation system.

This applies to applications where multiple unit controllers share a single space temperature sensor (for rooms with multiple units but only one zone sensor) for both standalone (with communication wiring between units) and building automation system applications. For this application you will need to use the Rover service tool.

For more information on setup, refer to the Trane publication EMTX-SVX01G-EN (Rover Service Tool:

Installation, Operation, and Programming Guide), or the most recent version.

Binary Inputs (Tracer ZN520)

The Tracer ZN520 controller has four available binary

inputs (see Table 19

). Normally, these inputs are factoryconfigured for the following functions:

• Binary input 1: Low temperature detection (freezestat)

• Binary input 2: Condensate overflow

• Binary input 3: Occupancy/ Generic

• Binary input 4: Fan status

Note: The generic binary input can be used with a Tracer

Summit ™ building automation system only.

Each binary input default configuration (including normally open/closed) is set at the factory. However, you can configure each of the four binary inputs as normally open or normally closed. The controller will be set properly for each factory-supplied binary input enddevice. When no device is connected to the input, configure the controller’s input as not used.

Table 19.

Binary input configurations (Tracer ZN520)

Binary

Input

BI 1

Description Configuration

Controller Operation

Contact

Closed

Low temperature detection (a)

Normally closed Normal

Contact

Open

Diagnostic (b)

BI 2

BI 3

Condensate overflow

(a)

Occupancy

Normally closed Normal

Diagnostic

Normally open Unoccupied Occupied

(b)

BI 3

BI 4

Generic binary input

Fan status

(a)

Normally open Normal (c) Normal

(c)

Normally open Normal Diagnostic (d)

Note:

The occupancy binary input is for standalone unit controllers as an occupied/unoccupied input. However, when the controller receives a communicated occupied/unoccupied request, the communicated request has priority over the hard-wired input.

(a) During low temperature, condensate overflow, and fan status diagnostics, the Tracer ZN520 control disables all normal unit operation of the fan, valves, and damper.

(b)

Table 20 shows the controller’s response to low temperature detection,

condensate overflow, and fan status diagnostics.

(c) The generic binary input does not affect unit operation. A building automation system reads this input as a generic binary input.

(d) If the fan mode input is in the off position or the controller is in the unoccupied mode with the fan off, the fan status input will be open. A diagnostic will not be generated when the controller commands the fan off. A diagnostic will only be generated if the fan status input does not close after one minute from energizing a fan output or any time the input is open for one minute. The controller waits up to one minute after energizing a fan output to allow the differential pressure to build up across the fan.

Binary Outputs (Tracer ZN520)

Binary outputs are configured to support the following:

• Three fan stages (when one or two fan stages are present, medium fan speed can be configured as exhaust fan)

• One hydronic cooling stage

• One hydronic heating stage (dehumidification requires this to be in the reheat position)

• One DX cooling stage

• One or two-stage electric heat (dehumidification requires this to be in the reheat position)

• Face and bypass damper

• Modulating outdoor air damper

• One baseboard heat stage

For more information, see

Table 20

Table 20. Binary output configuration (Tracer ZN520)

Binary

Output Configuration

J1-1

J1-2

J1-3

J1-4

J1-5

J1-6

J1-9

J1-10

J1-11

J1-12

TB4-1

TB4-2

Fan high

Fan medium

Fan low

(Key)

Cool valve—open, or 2-position valve (a)

Cool valve—close Note 1

Heat valve—open, or 2 position valve, or 1st electric heat

stage (a)

Heat valve—close or 2nd Electric heat stage

(a)

Fresh air damper—open

Fresh air damper—close

Generic/baseboard heat output

24 Vac

(a) For Tracer ZN520 units configured and applied as 2-pipe hydronic heat/ cool changeover, terminals J1-5 and J1-6 are used to control the primary valve for both heating and cooling. For Tracer ZN520 units configured and applied as 2-pipe hydronic heat/cool changeover with electric heat, terminals J1-5 and J1-6 are used to control the primary valve (for both cooling and heating), and terminals J1-9 and J1-10 are used only for the electric heat stage. For those 2-pipe changeover units, electric heat will not be energized while the hydronic supply is hot (5° or more above the space temperature).

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Table 21.

Analog inputs (Tracer ZN520)

Descripti on

Zone

Ground

Set

Fan

Ground

Analog input 1

Analog input 2

Analog input 3

Termina ls

TB3-1

Function

Space temperature input

TB3-2

TB3-3

B3-4

TB3-6

J3-1

J3-2

J3-3

J3-4

J3-5

J3-6

J3-7

Range

5°F to 122°F

Analog ground

Setpoint input

Fan switch input

40°F to 115°F

4821 to 4919 W (off)

2297 to 2342 W (auto)

10593 to 10807 W (low)

13177 to 13443 W

(medium)

15137 to 16463 W (high)

NA Analog ground

Entering water temperature

Analog ground

-40°F to 212°F

Discharge air temperature

Analog ground

-40°F to 212°F

Fresh air temp/generic temp

-40°F to 212°F

Analog ground

Universal input

0% to 100% Analog input 4

Ground

J3-8

J3-9

Generic 4–20mA

Humidity

Analog ground

0% to 100%

0 to 2000 ppm

Analog ground NA

Notes:

1. The zone sensor, entering water temperature sensor, discharge air sensor, and the outside air temperature sensor are 10KΩ thermistors.

2. Zone sensor: Wall-mounted sensors include a thermistor soldered to the sensor’s circuit board. Unit mounted sensors include a return air sensor in the units return air stream.

3. Changeover units include an entering water temperature sensor.

Zone Sensor (Tracer ZN520)

The Tracer ZN520 controller accepts the following zone sensor module inputs:

• Space temperature measurement (10k Ω thermistor)

• Local setpoint (either internal or external on the zone sensor module)

• Fan switch

• Timed override (On) and Cancel timed override

• Communication jack

Space Temperature Measurement (Tracer

ZN520)

Trane zone sensors use a 10k Ω thermistor to measure the space temperature. Typically, zone sensors are wallmounted in the room and include a space temperature thermistor. As an option, the zone sensor can be unitmounted with a separate space temperature thermistor located in the unit’s return air stream. If both a hard-wired and communicated space temperature value exist, the

UV-SVN03F-EN

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controller ignores the hard-wired space temperature input and uses the communicated value.

External Setpoint Adjustment (Tracer ZN520)

Zone sensors with an external setpoint adjustment (1k Ω) provide the Tracer ZN520 controller with a local setpoint

(50°F to 85°F or 10°C to 29.4°C). The external setpoint is exposed on the zone sensor’s front cover.

When the hard-wired setpoint adjustment is used to determine the setpoints, all unit setpoints are calculated based on the hard-wired setpoint value, the configured setpoints, and the active mode of the controller. The hardwired setpoint is used with the controller’s occupancy mode (occupied, occupied standby, or unoccupied), the heating or cooling mode, the temperature deadband values, and the heating and cooling setpoints (high and low limits) to determine the controller’s active setpoint.

When a building automation system or other controller communicates a setpoint to the controller, the controller ignores the hard-wired setpoint input and uses the communicated value. The exception is the unoccupied mode, when the controller always uses the stored default unoccupied setpoints. After the controller completes all setpoint calculations, based on the requested setpoint, the occupancy mode, the heating and cooling mode, and other factors, the calculated setpoint is validated against the following setpoint limits:

• Heating setpoint high limit

• Heating setpoint low limit

• Cooling setpoint high limit

• Cooling setpoint low limit

These setpoint limits only apply to the occupied and occupied standby heating and cooling setpoints. These setpoint limits do not apply to the unoccupied heating and cooling setpoints stored in the controller’s configuration.

When the controller is in unoccupied mode, it always uses the stored unoccupied heating and cooling setpoints.The unit can also be configured to enable or disable the local

(hard-wired) setpoint. This parameter provides additional flexibility to allow you to apply communicated, hardwired, or default setpoints without making physical changes to the unit.

Similar to hard-wired setpoints, the effective setpoint value for a communicated setpoint is determined based on the stored default setpoints (which determines the occupied and occupied standby temperature deadbands) and the controller’s occupancy mode.

Fan Switch (Tracer ZN520)

The zone sensor fan switch provides the controller with an occupied (and occupied standby) fan request signal (Off,

Low, Medium, High, Auto). If the fan control request is communicated to the controller, the controller ignores the hard-wired fan switch input and uses the communicated value. The zone sensor fan switch input can be enabled or

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Startup

disabled through configuration using the Rover service tool. If the zone sensor switch is disabled, the controller resorts to its stored configuration default fan speeds for heating and cooling, unless the controller receives a communicated fan input.

When the fan switch is in the off position, the controller does not control any unit capacity. The unit remains powered and all outputs drive to the closed position. Upon a loss of signal on the fan speed input, the controller reports a diagnostic and reverts to using the default fan speed.

On/Cancel Buttons (Tracer ZN520)

Momentarily pressing the on button during unoccupied mode places the controller in occupied bypass mode for

120 minutes. You can adjust the number of minutes in the unit controller configuration using Rover service tool. The controller remains in occupied bypass mode until the override time expires or until you press the Cancel button.

Communication Jack (Tracer ZN520)

Use the RJ-11 communication as the connection point from Rover service tool to the communication link—when the communication jack is wired to the communication link at the controller. By accessing the communication jack via Rover, you can access any controller on the link.

Communications (Tracer ZN520)

Tracer ZN520 controller communicates via Trane’s LonTalk protocol. Typically, a communication link is applied between unit controllers and a building automation system. Communication also is possible via Rover, Trane’s service tool. Peer-to-peer communication across controllers is possible even when a building automation system is not present. You do not need to observe polarity for LonTalk communication links.

The controller provides six 0.25-inch quick-connect terminals for the LonTalk communication link connections, as follows:

• Two terminals for communication to the board

• Two terminals for communication from the board to the next unit (daisy chain)

• Two terminals for a connection from the zone sensor back to the controller

Table 22. Zone sensor wiring connections (Tracer ZN520)

TB1

Description

Space temperature / timed override detection

Common

Setpoint

Fan mode

Communications

UC400 Sequence of Operation

The UC400 controller will operate to maintain the space temperature setpoint. This section provides information about sequence of operations.

Power-up Sequence (UC400)

When 24Vac power is initially applied to the UC400 controller, the following sequence occurs:

The Power Marquee LED turns on as red, then flashes green, and then turns a solid green.

2. All outputs are controlled OFF and all modulating valves and dampers close.

3. The controller reads all input local values to determine initial values.

4. The random start timer begins (refer to the following section,

“Random Start (UC400)” ).

5. The random start timer expires.

6. Normal operation begins, assuming there are no generated diagnostics. If any points are in fault or alarm mode, the Power Marquee LED flashes red.

Important: Flashing red does not indicate that the

UC400 controller will fail to operate.

Instead, the point(s) that are in fault or alarm mode should be checked to determine if the status of the point(s) is acceptable to allow equipment operation.

Random Start (UC400)

Random start is intended to prevent all units in a building from energizing at the same time. The random start timer delays the fan and any heating or cooling start-up from 5 to 30 seconds.

Occupancy Modes (UC400)

Occupancy modes can be controlled in the following ways:

• The state of the local (hard wired) occupancy binary input BI1.

• A timed override request from a Trane zone sensor (see

“Timed Override Control (UC400),” p. 81

• A communicated signal from either a Tracer SC or BAS.

A communicated request, from either a Tracer SC or BAS, takes precedence over local requests. If a communicated occupancy request has been established, and is no longer present, the controller reverts to the default (occupied) occupancy mode after 15 minutes (if no hard wired occupancy request exists). The UC400 controller has the following occupancy modes:

• Occupied

• Unoccupied

• Occupied standby

• Occupied bypass

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Occupied Mode (UC400)

In Occupied Mode, the UC400 controller maintains the space temperature based on the occupied space temperature setpoint ± occupied offset. The controller uses the occupied mode as a default mode when other forms of occupancy request are not present and the fan runs continuously. The outdoor air damper, if present, will close when the fan is OFF. The temperature setpoints can be local (hard wired), communicated, or stored default values (configurable using the Tracer TU service tool).

Unoccupied Mode (UC400)

In unoccupied mode, the UC400 controller attempts to maintain the space temperature based on the unoccupied heating or cooling setpoint. The fan will cycle between high speed and OFF. In addition, the outdoor air damper remains closed, unless economizing. The controller always uses the stored default setpoint values

(configurable using the Tracer TU service tool), regardless of the presence of a hard wired or communicated setpoint value.

Occupied Standby Mode (UC400)

The UC400 controller is placed in occupied standby mode

only when a communicated occupied request is combined with an unoccupied request from occupancy binary input

BI1. In occupied standby mode, the controller maintains the space temperature based on the occupied standby heating or cooling setpoints. Because the occupied standby setpoints have a typical temperature spread of 2°F

(1.1°C) in either direction, and the outdoor air damper is closed, occupied standby mode reduces the demand for heating and cooling the space. The fan will run as configured (continuously) for occupied mode. The controller always uses the stored default setpoint values

(configurable using the Tracer TU service tool), regardless of hard wired or communicated setpoint values. In addition, the outdoor air damper uses the economizer occupied standby minimum position setpoint to reduce the ventilation rate.

Occupied Bypass Mode (UC400)

The UC400 controller is placed in occupied bypass mode when the controller is operating in the unoccupied mode and when either the timed override ON button on the

Trane zone sensor is pressed or the controller receives a communicated occupied bypass signal from a BAS. In occupied bypass mode, the controller maintains the space temperature based on the occupied heating or cooling setpoints. The fan will run as configured (continuous or cycling). The outdoor air damper closes when the fan is

OFF. The controller remains in occupied bypass mode until either the CANCEL button is pressed on the Trane zone sensor or the occupied bypass time (configurable using the Tracer TU service tool) expires. The temperature setpoints can configured as local (hard wired), communicated, or stored default values using the Tracer

TU service tool.

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Startup

Timed Override Control (UC400)

If the UC400 controller has a timed override option

(ON/CANCEL buttons), pushing the ON button initiates a timed override on request. A timed override on request changes the occupancy mode from unoccupied mode to occupied bypass mode. In occupied bypass mode, the controller controls the space temperature based on the occupied heating or cooling setpoints. The occupied bypass time, which resides in the UC400 controller and defines the duration of the override, is configurable from

0 to 240 minutes (default value of 120 minutes). When the occupied bypass time expires, the unit transitions from occupied bypass mode to unoccupied mode. Pushing the

CANCEL button cancels the timed override request. In addition, it will end the timed override before the occupied bypass time has expired and transition the unit from occupied bypass mode to unoccupied mode.

If the controller is in any mode other than unoccupied mode when the ON button is pressed, the controller still starts the occupied bypass timer without changing to occupied bypass mode. If the controller is placed in unoccupied mode before the occupied bypass timer expires, the controller is placed into occupied bypass mode and remains in this mode until either the CANCEL button is pressed on the Trane zone sensor or the occupied bypass time expires.

Zone Temperature Control (UC400)

The UC400 controller has three methods of zone temperature control:

• Cascade zone control—used in the occupied, occupied bypass, and occupied standby modes. It maintains zone temperature by controlling the discharge air temperature to control the zone temperature. The controller uses the difference between the measured zone temperature and the active zone temperature setpoint to produce a discharge air temperature setpoint. The controller compares the discharge air temperature setpoint with the discharge air temperature and calculates a unit heating/cooling capacity accordingly (refer to the illustration below). The end devices (outdoor air damper, valves, and so on) operate in sequence based on the unit heating/cooling capacity (0–100 percent).

Active zone temperature setpoint

Difference

Calculated discharge air temperature setpoint

Difference

Calculated unit heating/cooling capacity

Measured zone temperature

Measured discharge air temperature

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If the discharge air temperature falls below the discharge air temperature low limit setpoint,

(configurable using the Tracer TU service tool), and the cooling capacity is at a minimum, the available heating capacity is used to raise the discharge air temperature to the low limit (refer to the following section,

“Discharge Air Tempering (UC400).” ).

• Simplified zone control— if discharge air temperature failure occurs, then simplified zone controls runs. In the unoccupied mode, the controller maintains the zone temperature by calculating the required heating or cooling capacity (0–100%) according to the measured zone temperature and the active zone temperature setpoint. The active zone temperature setpoint is determined by the current operating modes, which include occupancy and heat/ cool modes.

• Discharge air temperature control — is the backup mode that runs only if there is not valid zone temperature. In this mode, the active space temperature setpoint is used as the discharge air temperature setpoint.

Important: This is not a normal operating mode. The source of the invalid zone temperature needs to be corrected to restore normal operation.

Discharge Air Tempering (UC400)

If the UC400 controller is in cooling mode, cascade zone control initiates a discharge air tempering function when:

• The discharge air temperature falls below the discharge air temperature low limit setpoint

(configurable using the Tracer TU service tool)

• All cooling capacity is at a minimum. The discharge air tempering function allows the controller to provide heating capacity (if available) to raise the discharge air temperature to the discharge air temperature low limit setpoint.

• The cold outdoor air is brought in through the outdoor air damper and when the damper is at (high) minimum position. This causes the discharge air temperature to fall below the discharge air temperature low limit setpoint.

Heating or Cooling Mode (UC400)

The heating or cooling mode can be determined in one of two ways:

• By a communicated signal from a BAS or a peer controller

• Automatically, as determined by the UC400 controller

A communicated heating signal permits the controller to

only heat and a communicated cooling signal permits the controller to only cool. A communicated auto signal allows the controller to automatically change from heating to cooling and vice versa.

In heating or cooling mode, the controller maintains the zone temperature based on the active heating setpoint and the active cooling setpoint, respectively. The active heating and cooling setpoints are determined by the occupancy mode of the controller.

For 2-pipe and 4-pipe changeover units, normal heat/cool operation will not begin until the ability to conduct the desired heating or cooling operation is verified. This is done using the entering water temperature sampling function, for which a valid entering water temperature is required. When neither a hard wired nor a communicated entering water temperature value is present on changeover units, the controller operates in only heating mode and assumes the coil water is hot. The sampling function is not used.

The entering water temperature sampling function is used

only for changeover applications and for information and troubleshooting. It does not affect the operation of the controller. (For more information, refer to the following

section, “Entering Water Temperature Sampling Function

(UC400)” .)

Entering Water Temperature Sampling

Function (UC400)

The entering water temperature sampling function is used with 2-pipe and 4-pipe changeover units and requires a valid entering water temperature value. If the entering water temperature value is less than 5°F (2.8°C) above a valid zone temperature value for hydronic heating, and greater than 5°F (2.8°C) below a valid zone temperature value for hydronic cooling, the sampling function is enabled. When the sampling function is enabled, the

UC400 controller opens the main hydronic valve to allow the water temperature to stabilize. After 3 minutes, the controller again compares the entering water temperature value to the zone temperature value to determine if the desired heating or cooling function can be accomplished.

If the entering water temperature value remains out of range to accomplish the desired heating/cooling function, the controller closes the main hydronic valve and waits 60 minutes to attempt another sampling. If the entering water temperature value falls within the required range, it resumes normal heating/cooling operation and disables the sampling function.

Fan Operation (UC400)

The UC400 controller supports 1-, 2-, 3-speed fans and variable-speed fans. The fan always operates continuously while either heating or cooling during occupied, occupied standby, and occupied bypass operation. During unoccupied operation, the fan cycles between OFF and HIGH, regardless of the fan configuration. When running in AUTO mode, the fan operates differently based on the mode and the type of fan.

For 1-, 2-, and 3-speed fans, each time the fan is enabled, the fan begins operation and runs on high speed for a period of time (0.5 seconds for fan coils and 3 seconds for

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Note: In occupied mode, the UC400 controller requires continuous fan operation because of cascade zone control. In unoccupied mode, the fan cycles.

Manual Fan Speed Control (UC400)

Regardless of the fan type, the fan runs continuously at the desired fan speed during occupied, occupied standby, and occupied bypass operation as follows:

• When the controller receives a communicated fan speed signal (HIGH, MEDIUM, LOW)

• The associated fan speed switch is set to a specific fan speed

• The Supply Fan Speed Request point is overridden

During unoccupied operation, the fan cycles between OFF and HIGH, regardless of the communicated fan speed signal or fan speed switch setting (unless either of these is

OFF, which in turn, will control the fan OFF).

The fan turns OFF when:

• The controller receives a communicated OFF signal

• The fan speed switch is set to OFF

• Specific diagnostics are generated

• The default fan speed is set to OFF and the fan is operating in the AUTO mode

Note: The supply fan speed source can be configured for

BAS, local, or default value control using the Tracer

TU service tool.

AUTO Fan Operation; 1-, 2-, 3-speed Fans

(UC400)

When the controller receives a communicated auto signal

(or the associated fan speed switch is set to AUTO with no communicated value present), the fan operates in the

AUTO mode. In AUTO mode, the fan operates according to the fan default (configurable using the Tracer TU service tool). The fan speed has multiple speed configurations

(default is AUTO) or set to OFF for both heating and cooling operation. When configured as AUTO (and with multiple speeds available), the fan changes based on the required capacity calculated by the control algorithm.

AUTO Fan Operation; ECM Energy Efficient

Mode (UC400)

When the controller is configured for Energy Efficient

Mode, by means of the Fan Operating Mode Request MV point, the controller and daughter board will minimize energy use by running the fan at the lowest possible speed while maintaining space temperature. The controller will fully utilize valves, economizer, or electric heat which increases fan speed to meet space temperature (unless the

Startup

fan has been manually controlled. Refer to the preceding

section, “Manual Fan Speed Control (UC400)”

AUTO Fan Operation; ECM Acoustical Mode

(UC400)

When the controller is configured for Acoustical Mode, by means of the Fan Operating Mode Request MV point, the controller and daughter board will minimize acoustical nuisance by balancing changes in fan speed and total fan noise. The controller will fully OPEN cooling and heating valves before increasing fan speed to meet space temperature (unless the fan has been manually controlled.

Refer to the preceding section, “Manual Fan Speed

Control (UC400)”

). If multiple stages of electric heat exist the controller will use a single minimum air flow for each stage.

Exhaust Control (UC400)

Exhaust control is achieved by a single-speed exhaust fan and controlled by binary output 2 (BO2). Exhaust control, if not present, can be enabled by selecting Yes under the

Exhaust Fan Selection on the Tracer TU Configuration page under the Equipment Options group.

Note: Exhaust fan configuration cannot be selected with

3-speed fan operation.

Important: If exhaust control is added to an existing configuration, all other configuration options should be verified to match the correct equipment options.Temperature and flow setpoints will revert to default values.

The exhaust function is coordinated with the supply fan and outdoor/return air dampers as follows:

• The exhaust fan energizes when the fan is running and when the outdoor air damper position is greater than or equal to the exhaust fan enable position (or the outside air damper position at which the exhaust fan turns ON).

• The exhaust fan turns OFF when the fan either turns

OFF or the outdoor air damper closes to 10 percent below the exhaust fan enable position.

• If the exhaust fan/damper enable setpoint is less than

10 percent, the exhaust output is energized if the outdoor air damper position is at the setpoint and deenergized at 0.

Valve Operation (UC400)

The UC400 controller supports one or two modulating or two-position valves, depending on the application (refer

Table 23, p. 84

). The controller opens and closes the appropriate valve(s) to maintain the active zone temperature setpoint at the heating setpoint in heating mode or the cooling setpoint in cooling mode (refer to

“Cascade Zone Control,” p. 81

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Modulating Valve Operation (UC400)

The UC400 controller supports tri-state modulating valve control. Two binary outputs control each valve: one to drive the valve open and one to drive the valve closed. The stroke time for each valve is configurable using the Tracer

TU service tool. The controller supports the following:

• Heating

• Cooling

• Heat/cool changeover with a single valve and coil for 2pipe applications

• Cooling or heat, cool changeover with the main valve, and coil

• Only heating with the auxiliary valve and coil for 4-pipe applications

The controller moves the modulating valve to the desired positions based on heating or cooling requirements.

Modulating Valve Calibration (UC400)

Modulating valve calibration is automatic. During normal controller operation, the UC400 overdrives the actuator

(135 percent of the stroke time) whenever there is a request for a position of 0 percent or 100 percent. At either power-up, after a power outage, or when the occupancy status changes to unoccupied, the controller first drives all modulating valves (and dampers) to the closed position.

The controller calibrates to the fully CLOSED position by over driving the actuator (135 percent of the stroke time).

Thereafter, the controller resumes normal operation.

Two-position Valve Operation (UC400)

The UC400 controller supports two-position valves with a single binary output for each valve. Controllers used for

2-pipe applications support heating, cooling, or heat/cool changeover with a single valve/coil. A controller used for

4-pipe applications supports cooling or heat/cool changeover with a main valve/coil and heating only with an auxiliary valve/coil.

Modulating Outdoor/Return Air Damper

(UC400)

The UC400 controller operates the modulating outdoor/ return air dampers based on the following:

• Occupancy mode

• Outdoor air temperature (communicated or hard wired sensor)

• Zone temperature

• Setpoint

• Discharge air temperature

• Discharge air temperature setpoint

The minimum position for an outdoor air damper is configurable using the Tracer TU service tool for both occupied mode and occupied standby mode and for low-

84 speed fan operation. A controller can receive a BAScommunicated outdoor air damper minimum position.

A BAS-communicated minimum position setpoint has priority over all locally configured setpoints. When a communicated minimum position setpoint is not present, the controller uses the configured minimum position for low fan speed whenever the fan is running at low speed,

regardless of the occupancy state. Refer to Table 23 and

Table 24

for more information about how the controller determines the position of the modulating outdoor air damper.

Table 23. Modulating outdoor air damper position setpoint determination (UC400)

Occupancy

Unoccupied

• Occupied

• Occupied bypass

• Occupied standby

• Occupied

• Occupied bypass

• Occupied standby

• Occupied

• Occupied bypass

Occupied standby

BAScommunicated

Setpoint

Any value

Valid

Fan speed

Active

Minimum

Setpoint

Any value 0% (closed).

Any value BAScommunicated.

Invalid

Low

Medium/ high

Occupied low fan minimum.

Occupied minimum.

Occupied standby minimum.

Table 24. Relationship between outdoor temperature sensors and damper position (UC400)

Outdoor Air

Temperature

Modulating outdoor air damper position

Occupied or

Occupied

Bypass

Occupied

Standby Unoccupied

No or invalid outdoor air temperature.

Open to occupied minimum position.

Open to occupied standby minimum position.

Closed.

Failed outdoor air sensor.

Open to occupied minimum position.

Open to occupied standby minimum position.

Closed.

Outdoor air temperature present and economizing possible (Refer to section,

“Economizing

(Free Cooling)

(UC400),” p. 84

Economizing; damper controlled between occupied minimum position and

100%.

Economizing; damper controlled between occupied standby minimum position and 100%.

Open and economizing during unit operation; otherwise closed.

Outdoor air temperature present and economizing not possible (Refer to section,

“Economizing

(Free Cooling)

(UC400),” p. 84

Open to occupied minimum position.

Open to occupied standby minimum position.

Closed.

Economizing (Free Cooling) (UC400)

Cooling with outdoor air (during the times when the temperature is low enough to allow) is referred to as economizing (free cooling). The UC400 controller and applications with modulating outside air damper, support

UV-SVN03F-EN

UV-SVN03_.book Page 85 Thursday, January 24, 2013 5:27 PM economizing. The modulating outdoor air damper provides the first source of cooling for the controller.

The controller initiates economizing if the outdoor air temperature is below the economizer enable point

(configurable using the Tracer TU service tool). If economizing is initiated, the controller modulates the outdoor air damper (between the active minimum damper position and 100 percent) to control the amount of outdoor air cooling capacity. When the outdoor air temperature rises 5°F (2.8°C) above the economizer enable point, the controller disables economizing and moves the outdoor air damper back to its predetermined minimum position, based on the current occupancy mode or communicated minimum outdoor air damper position. If an outdoor air temperature value is not present, economizing is disabled.

Two-position Control Of A Modulating

Outdoor Air Damper (UC400)

The UC400 controller supports two-position outdoor air damper actuators. However, a modulating outdoor/return air damper actuator can be used for two-position control.

Two-position control can be achieved by not providing an outdoor air temperature (neither hard wired nor communicated) to the controller, and by setting the damper minimum position (using the Tracer TU service tool) to the desired value, typically 100 percent.

Electric Heat Operation (UC400)

The UC400 controller supports both SCR (modulating) and staged electric heat (1- or 2-stages). SCR heat is only a field-installed option. In a unit configured with staged electric heat, the electric heating circuit(s) are cycled ON and OFF appropriately to maintain the desired space temperature at the active heating setpoint. In a unit configured with SCR (modulating) electric heat, the UC400 will send a 0 to 10 Volt DC signal to adjust SCR capacity in order to maintain the desired space temperature.

In both staged and modulating electric heat applications, the simultaneous use of electric and hydronic heat is not supported and the UC400 will operate electric heat only when hot water is not available (for example, in a changeover unit). In addition, the UC400 will run the supply fan for 30 seconds after electric heat is turned OFF in order to dissipate heat from the unit

Note: This delay does not apply to steam or hydronic heating.

Factory-configured electric heat units have built-in mechanical protections to prevent dangerously high discharge air temperatures.

Dehumidification Operation (UC400)

The UC400 controller supports space dehumidification when:

• Mechanical (DX or hydronic) cooling is available

• The heating capacity is located in the reheat position

UV-SVN03F-EN

Startup

• The space relative humidity is valid

The space relative humidity can be a BAS-communicated value or come directly from a wired relative humidity sensor. The controller begins to dehumidify the space when the space humidity exceeds the humidity setpoint.

The controller continues to dehumidify until the sensed humidity falls below the setpoint minus the relative humidity offset.

Peer-to-peer Communication (UC400)

Peer-to-peer communication is accomplished by means of custom TGP2 programming in the Tracer SC system controller or via hard wiring only between controllers.

Unit Protection Strategies (UC400)

The following unit protection strategies are initiated when specific conditions exist in order to protect the unit or building from damage:

• Smart reset

• Low coil temperature protection

• Condensate overflow

• Fan status

• Fan off delay

• Filter maintenance timer

• Freeze avoidance

• Freeze protection (discharge air temperature low limit)

Smart Reset (UC400)

The UC400 controller will automatically restart a unit that is locked out as a result of a Low Coil Temp Detection

(BI3) diagnostic. Referred to as smart reset, this automatic restart will occur 30 minutes after the diagnostic occurs. If the unit is successfully restarted, the diagnostic is cleared.

If the unit undergoes another Low Coil Temp Detection diagnostic within a 24-hour period, the unit will be locked out until it is manually reset.

Note: Freeze protection will also perform a smart reset.

Low Coil Temperature Protection (UC400)

For more information refer to BAS-SVX48B-EN

(Installation, Operation, and Programming: Tracer UC400

Programmable Controller), or the most recent revision,

and the preceding section, “Smart Reset (UC400)” .

Condensate Overflow (UC400)

For more information refer to BAS-SVX48B-EN

(Installation, Operation, and Programming: Tracer UC400

Programmable Controller), or the most recent revision.

Fan Status (UC400)

In 1-, 2- and 3-speed fans, the status is based on the statuses of the supply fan output multistate and analog points dedicated to fan control. The fan status is reported as HIGH, MEDIUM, LOW, and as a percentage, whenever

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Startup

the fan is running. The fan status is reported as OFF whenever the fan is not running. In addition, a fan status switch can be connected to binary input 5 (BI5) to monitor the status of the fan for belt-driven or direct-driven units

(except Trane Macon factory ECM fan motor units). The fan status switch provides feedback to the controller as follows:

• If the fan is not operating when the controller has the fan controlled to ON, the controller generates a Low

Airflow-Supply Fan Failure diagnostic.

• If the UC400 controller energizes the fan output for

1 minute, and the fan status switch indicates no fan operation, the controller performs a unit shutdown and generates a Low Airflow-Supply Fan Failure diagnostic.

• If the fan has been operating normally for one minute, but the fan status switch indicates no fan operation, the same diagnostic is generated.

This manual diagnostic discontinues unit operation until the diagnostic has been cleared from the controller. If a diagnostic reset is sent to the controller, and the fan condition still exists, the controller attempts to run the fan for 1 minute before generating another diagnostic and performing a unit shutdown. A diagnostic reset can be sent to the controller from the Tracer TU Alarms page or by temporarily overriding the Reset Diagnostic Request on the Tracer TU Binary Status page.

Note: In the ECM fan application, the ECM engine board will monitor the status of the fan. In case of a failure, the engine board will disable the motor immediately, and the low airflow diagnostic is sent.

Fan Off Delay (UC400)

After heating has been controlled OFF, the UC400 controller keeps the fan energized for an additional 30 seconds in order to remove residual heat from the heating source.

Filter Maintenance Timer (UC400)

The filter maintenance timer tracks the amount of time (in hours) that the fan is enabled. The Filter Runtime Hours

Setpoint (configurable using the Tracer TU service tool) is used to set the amount of time until maintenance

(typically, a filter change) is required. The timer can be enabled/disabled from the Supply Fan group on the

Setup Parameters page in Tracer TU.

The UC400 controller compares the fan run time to filter runtime hours setpoint. Once the setpoint is reached, the controller generates a Filter Change Required diagnostic. When the diagnostic is cleared, the controller resets the filter maintenance timer to zero, and the timer begins accumulating fan run time again. The diagnostics can be cleared and the filter timer reset by temporarily overriding the Filter Timer Reset Request on the Binary

Status page or by using the reset button on the Alarms page in Tracer TU.

Freeze Avoidance (UC400)

Freeze avoidance is used for low ambient temperature protection. It is initiated only when the fan is OFF. The

UC400 controller enters the freeze avoidance mode when the outdoor air temperature is below the freeze avoidance setpoint (configurable using the Tracer TU service tool).

The controller disables freeze avoidance when the outdoor air temperature rises 3°F (1.7°C) above the freeze avoidance setpoint.

The following occurs when the controller is in freeze avoidance mode:

• Valves are driven open to allow water to flow through the coil

• Fan is OFF

• Economizing is disabled

• The outdoor/return air damper is closed

• DX cooling is OFF

• Electric heat stages are OFF

Freeze Protection (Discharge Air Temperature

Low Limit) (UC400)

The UC400 controller monitors the discharge air temperature with a 10 k Ω thermistor wired to AI4. The freeze protection operation is initiated whenever the discharge air temperature falls below the discharge air temperature low limit. The discharge air temperature low limit is configurable using the Tracer TU service tool.

During freeze protection, the controller increases the heating capacity or decreases the cooling capacity in order to raise the discharge air temperature above the low limit.

If the discharge air temperature remains below the low limit for 3 minutes, the controller generates a Discharge

Air Temp Limit diagnostic.

Freeze protection will also perform a smart reset. Refer to

“Smart Reset (UC400),” p. 85 .

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Maintenance

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures recommended in this section of the manual could result in exposure to electrical, mechanical or other potential safety hazards. Always refer to the safety warnings provided throughout this manual concerning these procedures. When possible, disconnect all electrical power including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized.

When necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been trained in handling live electrical components perform these tasks. Failure to follow all of the recommended safety warnings provided, could result in death or serious injury.

Service Access

To access the unit for water balancing, motor access or other start-up and maintenance functions, use one of the following methods:

Remove the end pocket front panel.

2. Remove the return air grille by releasing the mounting screws.

3. If there is no shelving or other obstructions, removing the end panel may allow more access.

Periodic Maintenance

The following maintenance suggestions apply to all types of unit ventilators, chilled water, hot water, split systems and electric. Additional information for controls not supplied by The Trane Company should be obtained from the controls manufacturer.

Split system unit ventilators include a condensing unit and the instructions provided with the condensing unit will apply to the entire refrigerant system.

Filters.

The air filters supplied with Trane UVs are specially designed for high lint content. Depending upon room conditions, these filters will normally need to be replaced every four to eight weeks. To assure proper unit operation, inspect the filters monthly and clean or replace as required.

Overloaded filters will reduce unit air handling capacity, which may result in insufficient heating during the morning warm-up period and loss of natural cooling capacity during mild weather.

Filter Replacement.

The air filter on the vertical unit is located near the bottom of the unit. Filter sizing may be found in

Table 5, p. 11

To remove the filters, take-off the air section’s front panel.

UV-SVN03F-EN

2. Slide the filter out of the filter rack on the bottom of the unit.

3. Replace old filter with new filter and re-attach front panel.

NOTICE:

Equipment Damage!

Do not operate unit without filters or grilles in place.

Failure to do so may cause equipment failure.

Cleaning of the Drain Pan.

The unit ventilators drain pan is removable for periodic cleaning or easy access for maintenance/drainage issues. Use

Figure 60 and

Figure 61, p. 88 , and the following steps for removing the

drain pan.

WARNING

Hazardous Voltage!

Turn off power to the unit and remove the front panel.

2. Disconnect the condensate drain line from the P-trap.

3. Disconnect fan plug.

4. Remove (4) pan clips located at each end of the pan’s front.

5. Disconnect the fan board ground wire and slide out fan board (see

Figure 60 ).

6. Remove drain pan for cleaning (see

Figure 61, p. 88

When reinstalling, reverse sequence.

Figure 60.

Slide out fan board

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Maintenance

Figure 61.

Removal of drain pan

Access to Fanboard & Motor.

The unit ventilator fan board can be removed for service to the blower motor and fan wheels. The fan board must also be removed for easier access to the unit coils for cleaning and maintenance.

Utilize the following steps for proper removal of the fanboard.

WARNING

Hazardous Voltage!

Turn off power to the unit and remove the front panel.

2. Disconnect P-trap from drain pan.

3. Disconnect motor plug.

4. Slide fan board by pulling deck forward (see

Figure 62 ).

NOTICE:

Equipment Damage!

Support the fanboard to prevent the deck from sliding too far forward and falling out of the unit. Failure to do so could cause equipment damage.

5. When reinstalling, use the same steps in reverse order.

Motor .

The fan motor is a permanent split capacitor type motor with voltage specific power. See electrical

performance and Table 25 for motor voltage.

Table 25. Motor voltage

Unit voltage

115-60-1

208-60-1

230-60-1

208-60-3

460-60-3

277-60-1

230-60-3

Motor voltage

115-60-1

208/230-60-1

277-60-1

208/230-60-1

If a replacement motor is required, it should be ordered from The Trane Company. To replace the fan motor, complete the following steps:

6. Complete steps for removal of fan board (see

“Cleaning of the Drain Pan,” p. 87 ).

Disconnect the fan board ground wire.

8. Using a 7/16-in. Allen wrench, loosen the coupling on the fan shaft.

9. Loosen the screw on the motor clamp until it allow the motor to be lifted off the base (see

Figure 63

10. Lift the motor and pull forward until fan shaft separates

from the motor (see Figure 64 ).

11. Attach new motor to fan shaft and reverse steps to complete installation.

Figure 62.

Fan board removal for fan / motor access

Figure 63.

Loosen screws

Figure 64.

Lift / pull motor forward

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Modulating Valves.

The valve should be serviced by a trained, experienced technician. For detailed piping installation steps, see

“Installation—Piping,” p. 24

; for

modulating valve removal steps, see “Modulating Water

Valves (Option),” p. 25 .

For general servicing or malfunction, follow one of the appropriate steps:

WARNING

Hazardous Voltage!

Maintenance

3. Removed the coil’s solid steel front cover.

4. Vacuum the dust/particles from the coil face.

5. Reverse order for re-installation.

Preventive Maintenance

A comprehensive preventive maintenance program should be established for a unit ventilator system. The following are several key elements:

• Inspect the filters monthly. Follow the instructions for

“Filter Replacement,” p. 87

• Inspect and clean the drain pan every three months.

• Check the coils for ‘‘dirt’’ accumulation every three to six months. Clean the coils at least once each year.

Inspect the unit ventilator insulation every three months; thoroughly clean as needed.

CAUTION

Hot Water!

The modulating valves may contain hot water. If the valve is leaking, drain system OR isolate valve from the system. DO NOT remove valve body from plumbing as hot water could come out which could result in minor to moderate burns.

NOTICE:

Structural Damage!

If the valve is leaking, drain system OR isolate valve from the system. DO NOT remove valve body from plumbing. If the system contains water, structural damage could result.

If the valve is leaking, drain system OR isolate valve from the system. DO NOT remove valve body from plumbing.

2. Ensure the cartridge needs to be replaced. If so, follow appropriate steps explained for cartridge assembly removal.

3. If the motor or other internal parts of the actuator is damaged, replace the entire actuator assembly.

Note: These hydronic valves are designed and tested for silent operation. However, water noise may occur as a result of high water velocity. Piping noises may also occur in high temperature (over 212°F) systems with insufficient water pressure.

Note: Do not use petroleum-based or mineral oil type boiler additives. Compounds with a 50 percent water dilution that can be used are diethylene glycol, etheylene glycol and propylene glycol.

Coil Cleaning.

Periodically the hydronic coils should be cleaned from dirt accumulation that could reduce the unit performance. To clean the equipment coil:

Remove the unit’s front panel.

2. Remove the unit’s front nosing.

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Diagnostics

Troubleshooting Checklist

WARNING

Hazardous Service Procedures!

The maintenance and trouble shooting procedures recommended in this section of the manual could result in exposure to electrical, mechanical or other potential safety hazards. Always refer to the safety warnings provided throughout this manual concerning these procedures. When possible, disconnect all electrical power including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized.

When necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been trained in handling live electrical components per these tasks. Failure to follow all of the recommended safety warnings provided, could result in death or serious injury.

If operating difficulties are encountered, refer to the following table for probable causes and corrective measures. If suggested corrective measures have been taken, and the trouble still persists, contact the control supplier or the local Trane Sales Office.

Problem

Room too warm

(outside air temperature is below 35°F)

Room too warm

(outside air temperature is above 35°F)

Room too warm

(outside air temperature is above 35°F)

Unit utilizes Wall Fin auxiliary radiation:

Heating Cooling Cause

X Main power off.

Correction

Check fuses.

Room sensor is not properly set.

Reset room sensor temperature.

Room sensor is providing a false reading due to walls being cold from the night temperature setting.

Start the warm-up cycle earlier in the morning to provide appropriate time-frame to increase room temperature prior to space occupation.

Relocate sensor.

Sensor is mounted on a block wall that is leaking cold air into the room through the mounting holes.

Face and bypass damper, or coil valve is malfunctioning.

Room sensor is not properly set.

Replace malfunctioning component, or contact the control’s contractor, or if Trane controls, see CNT-SVX04A-EN for more information concerning Tracer controls.

Reset room sensor temperature.

Face and bypass damper or coil control valve is malfunctioning.

Replace malfunctioning component, or contact the control’s contractor, or if Trane controls, see CNT-SVX04A-EN for more information concerning Tracer controls.

OA damper is in the closed position.

Ensure OA damper is in the open position.

Clogged filter.

Control valve is malfunctioning.

Boiler.

Replace filter.

Check flow of hot water through the control valve.

Check the boiler reset schedule to determine if the loop temperature can be decreased.

Steam.

Outside air temperature is above 60°F to

65°F.

Check the operation of the control valves.

The economics of the unit ventilator selection dictate that, in most cases, the unit will be sized to provide adequate natural

(ventilation) cooling without outside temperatures up to 60°F to 65°F. Above this point, a changeover should be made to the mechanical cooling cycle.

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Diagnostics

Problem

Room too cool

Unit utilizes Wall Fin auxiliary radiation:

Room too hot

Heating Cooling Cause

X Room sensor is not properly set.

X Clogged filter.

X Face and bypass damper, or coil valve is malfunctioning.

OA damper is in the open position.

Boiler pressure or temperature design requirements not being met.

Radiation controls malfunctioning.

Correction

Reset room sensor temperature.

Replace filter.

Replace malfunctioning component, or contact the control’s contractor, or if Trane controls, see CNT-SVX04A-EN for more information concerning Tracer controls.

Ensure OA damper is in the closed or minimum outside air position.

On hot water and steam type units, check the boiler pressure or temperature to ensure that the requirements are being met.

Check the operation of the wall fin controls.

Motor

Unit

265 and 460 volt unit

Room sensor is not properly set.

Clogged filter.

Face and bypass damper, or coil valve is malfunctioning.

Reset room sensor temperature.

Replace filter.

Replace malfunctioning component, or contact the control’s contractor, or if Trane controls, see CNT-SVX04A-EN for more information concerning Tracer controls.

OA damper is in the open position.

Ensure OA damper is in the minimum outside air position.

Chiller temperature design requirements not being met.

Check the temperature of the water leaving the chiller to ensure that it meets design requirements.

If the motor fails to start, and other motors on the same circuit are functioning.

Check the unit switch to ensure it is in the ON position.

If the motor fails to start, and other motors on the same circuit are functioning.

Check for loose switch or motor connection.

If the unit fails to start.

Check fuse in right-hand end pocket inside the transformer mounting box. Replace with

Trane fuse X1311057435 (ABC type 6A

250V).

Output Testing and Diagnostics

(Tracer ZN520)

Table 26. Tracer ZN520 diagnostics

Diagnostic

Condensate overflow

Fan Other Outputs (a)

Off Valves Closed, Fresh air damper Closed, Electric heat Off, Baseboard heat Off

Low temperature detection

Off Valves Open, Fresh air damper Closed, Electric heat

Off, Baseboard heat Off

Low air flow - fan failure

Off Valves Closed, Fresh air damper Closed, Electric heat Off, Baseboard heat Off

Space temperature failure

Entering water temp failure

Discharge air temp low limit

Discharge air temp failure

Fresh air temp failure

Enabled (b) , Fresh air damper Enabled

Electric heat Enabled (b)

, Baseboard heat Off

(b) ,

Off Valves Open, Fresh air damper Closed, Electric heat

Off, Baseboard heat Off

Off Valves Closed, Fresh air damper Closed, Electric heat Off, Baseboard heat Off

On Valves Enabled, Fresh air damper Minimum position

Enabled

Relative humidity failure

On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled

Generic 4–20mA failure

On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled

Table 26. Tracer ZN520 diagnostics

Diagnostic Fan Other Outputs (a)

Input failure On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled

Maintenance required

On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled

Local fan mode failure

Local setpoint failure

Valves Enabled, Fresh air damper Enabled, Electric heat Enabled, Baseboard heat Enabled

Invalid unit configuration

Normal—power up

Off Valves Disabled, Fresh air damper Disabled,

Electric heat Disabled, Baseboard heat Disabled

On Valves Enabled, Fresh air damper Enabled, Electric heat Enabled

(a) The generic binary output (TB4-1, TB4-2) state is unaffected by all unit diagnostics.

(b) When the entering water temperature is required but not present, the

Tracer ZN520 controller generates a diagnostic to indicate the sensor loss condition. The controller automatically clears the diagnostic once a valid entering water temperature value is present (non-latching diagnostic). When the entering water temperature sensor fails, the controller prohibits all hydronic cooling operation, but allows the delivery of heat when heating is required. In the Cool mode, all cooling is lockedout, but normal fan and outdoor air damper operation is permitted.

(c) When the outdoor air temperature sensor has failed or is not present, the Tracer ZN520 controller generates a diagnostic to indicate the sensor loss condition. The controller automatically clears the diagnostic once a valid outdoor air temperature value is present (non-latching diagnostic). When the outdoor air temperature sensor fails or is not present, the controller prohibits economizer operation.

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Diagnostics

Translating Multiple Diagnostics (Tracer

ZN520)

The controller senses and records each diagnostic independently of other diagnostics. It is possible to have multiple diagnostics present simultaneously. The diagnostics are reported in the order they occur.

Possible diagnostics include:

• Low temperature detection

• Condensate overflow

• Low air flow—fan status

• Discharge air temp limit

• Space temperature failure 1

• Entering water temp failure

• Discharge air temp failure

• Outdoor air temp failure

• Local setpoint failure

• Local fan mode failure

• CO

sensor failure

• Generic AIP failure

• Humidity input failure

•

Defrosting compressor lockout 1

• Maintenance required

• Invalid unit configuration

• Generic temperature failure

• Discharge air low limit

Resetting Diagnostics (Tracer ZN520)

There are a number of ways in which diagnostics are reset:

Automatic reset by the controller

2. By initiating a manual output test at the controller

3. By cycling power to the controller

4. Through Rover, Trane’s service tool

5. Tracer ZN520: by using any other communicating device ab le to access the controller’s diagnostic reset input.

6. Tracer ZN520: by cycling the fan switch from Off to any speed setting.

Automatic Reset by the Controller (Tracer

ZN520)

The controller includes an automatic diagnostic reset function that attempts to automatically restore the unit when a low temperature diagnostic occurs.

Note: The controller implements the automatic diagnostic reset function only once every 24 hours.

For the controller to increment the 24 hour timer, you must maintain power to the controller. Cycling power resets all timers and counters.

After the controller detects the first special diagnostic, the unit waits 30 minutes before invoking the automatic diagnostic reset function. The automatic diagnostic reset function clears the special diagnostic and attempts to restore the controller to normal operation. The controller resumes normal operation until another diagnostic occurs.

Note: The automatic diagnostic reset function does not operate during the manual output test sequence.

If a special diagnostic occurs within 24 hours after an automatic diagnostic reset, the controller must be manually reset. Other possible methods of resetting diagnostics are described in the sections that follow.

Manual Output Test (Tracer ZN520)

To verify proper end device operation, press the controller’s Test button. This exercise will verify all outputs in a predefined sequence, the first of which will attempt to reset the controller diagnostics if any are present.

Cycling Power to the Controller (Tracer ZN520)

After removing and reapplying the 24 Vac power from the board, the unit cycles through a power-up sequence. By default, the controller attempts to reset all diagnostics present at power-up. Diagnostics present at power-up and those that occur after power-up are handled according to

Table 27

Table 27.

Tracer ZN520 controller diagnostics

Diagnostic

Auxiliary temp. failure

Setpoint

Latching Fan

Condensate overflow detection

Yes

Entering water temp. failure

Fan mode failure No

Invalid unit configuration failure Yes

Low temp. detection Yes

Maintenance required

Yes

Enabled

Off

Enabled Enabled Enabled Enabled

Disabled Disabled Disabled Disabled

Off

Enabled

Valves

No action

Closed Off

Open

No action

Elec

Heat

Off

Damper

No action No action

Closed

No action No action

Zone temp. failure No Off Closed Off Closed

Notes:

1. Priority Level: Diagnostics are listed in order from highest to lowest priority. The controller senses and records each diagnostic independently of other diagnostics. It is possible to have multiple diagnostics present simultaneously. The diagnostics affect unit operation according to priority level.

2. Latching: A latching diagnostic requires a manual reset of the controller; while a non-latching diagnostic automatically resets when the input is present and valid.

3. Enabled: End device is allowed to run if there is a call for it to run.

4. Disabled: End device is not allowed to run even if there is a call for it to run.

5. No Action: The diagnostic has no affect on the end device.

Non-latching diagnostics automatically reset when the input is present and valid.

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Diagnostics

Using Trane’s Service Tool, Rover (Tracer

ZN520)

Rover, Trane’s service tool, can reset diagnostics present in the controller and troubleshoot the unit. For more information, refer to the Trane publication

EMTX-SVX01G-EN (Rover Service Tool: Installation,

Operation, and Programming Guide), or the most recent revision.

Diagnostic Reset (Tracer ZN520)

Any device that can communicate the network variable nviRequest (enumeration “clear_alarm”) can reset diagnostics in the Tracer ZN520 controller.The controller also attempts to reset diagnostics whenever power is cycled.

Cycling the Fan Switch (Tracer ZN520)

Cycle the fan speed switch from Off to any speed and the controller resets all diagnostics. Diagnostics may recur immediately if the problem still exists.

Table 28. Fan outputs do not energize (Tracer ZN520)

Probable

Cause Explanation

Random start After power-up, the controller always observes a random start that varies observed between 0 and 25 seconds. The controller remains off until the random start time expires.

Power-up control wait

When power-up control wait is enabled (non-zero time), the controller remains off until one of two conditions occurs:

1. The controller exits power-up control wait once it receives communicated information.

Cycling fan operation

2. The controller exits power-up control wait once the power-up control wait time expires.

When the fan mode switch is in the auto position, the unit fan cycles off when there is no call for heating or cooling. The heating/cooling sources cycle on or off periodically with the unit fan to match the capacity according to pulse-widthmodulation (PWM) logic.

Unoccupied operation

The fan cycles with capacity when the unit is in unoccupied mode. This occurs even if the unit is in continuous fan operation. While unoccupied, the fan cycles on or off with heating/cooling to provide varying amounts of heating or cooling to the space to match the to pulse-width-modulation

(PWM) logic.

Fan mode off When using the local fan mode switch to determine the fan operation, the off position controls the unit fan to off.

Requested mode: off

It is possible to communicate the operating mode (such as off, heat, and cool) to the controller. When “off” is communicated to the controller, the unit controls the fan to off. The unit is not capable of heating or cooling when the controller is in this mode.

Diagnostic present

No power to the controller

A specific list of diagnostics effects fan operation. For more information, see

“Diagnostics,” p. 90 .

If the controller does not have power, the unit fan will not operate. For the controller to operate normally, it must have an input voltage of 24 Vac. When the green LED is off continuously, the controller does not have sufficient power or the controller has failed.

Manual output test

The controller includes a manual output test sequence to verify binary output operation and the associated wiring.

However, based on the current step in the test sequence, the

unit fan may not be powered on. Refer to “Manual Output

Test (Tracer ZN520),” p. 92 .

Unit wiring The wiring between the controller outputs and the fan relays and contacts must be present and correct for normal fan operation. Refer to the typical unit wiring diagrams.

Table 29. Valves stay closed (Tracer ZN520)

Probable

Cause

Normal operation

Explanation

The controller opens and closes the valves to meet the unit capacity requirements.

Requested mode: off

It is possible to communicate the operating mode (such as off, heat, and cool) to the controller. When off is communicated to the controller, the unit controls the fan to off. The unit is not capable of heating or cooling when the controller is in this mode.

Valve override The controller can communicate a valve override request.

This request affects the valve operation.

Manual output test

The controller includes a manual output test sequence to verify analog and binary output operation and the associated wiring. However, based on the current step in the test sequence, the valves may not be open. Refer to

“Manual

Output Test (Tracer ZN520),” p. 92 .

Diagnostic present

Sampling logic

Unit configuration

No power to the controller

Unit wiring

A specific list of diagnostics affects valve operation. For more information, see

“Diagnostics,” p. 90 .

The controller includes entering water temperature sampling logic that automatically invokes during 2-pipe or

4-pipe changeover. It determines when the entering water temperature is either too cool or too hot for the desired heating or cooling mode.

The controller must be properly configured based on the actual installed end devices and application. When the unit configuration does not match the actual end device, the valves may not work correctly.

If the controller does not have power, the valves do not operate. For the controller to operate normally, it must have an input voltage of 24 Vac. When the green LED is off continuously, the controller does not have sufficient power, or the controller has failed.

The wiring between the controller outputs and the valve(s) must be present and correct for normal valve operation.

Refer to the typical unit wiring diagrams.

Table 30. Valves stay open (Tracer ZN520)

Probable

Cause

Normal operation

Explanation

The controller opens and closes the valves to meet the unit capacity requirements.

Manual output test

The controller includes a manual output test sequence that verifies analog and binary output operation and the associated wiring. However, based on the current step in the test sequence, the valves may be open. Refer to

“Manual

Output Test (Tracer ZN520),” p. 92

Diagnostic present

A specific list of diagnostics affects valve operation. For more

information, see “Diagnostics,” p. 90

Sampling logic

Unit configuration

Unit wiring

The controller includes entering water temperature sampling logic that automatically invokes during 2-pipe or

4-pipe changeover to determine if the entering water temperature is correct for the unit operating mode.

The wiring between the controller outputs and the valve(s) must be present and correct for normal valve operation.

Refer to the typical unit wiring diagrams.

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Diagnostics

Table 31.

Electric heat not operating (Tracer ZN520)

Probable

Cause

Normal operation

Explanation

The controller cycles electric heat on and off to meet the unit capacity requirements.

Requested mode: off

It is possible to communicate the operating mode (such as off, heat, cool) to the controller. When off is communicated to the controller, the units shuts off the electric heat.

Communicated disable

Numerous communicated requests may disable electric heat, including an auxiliary heat enable input and the heat/ cool mode input. Depending on the state of the communicated request, the unit may disable electric heat.

Manual output test

The controller includes a manual output test sequence that verifies analog and binary output operation and associated output wiring. However, based on the current step in the test sequence, the electric heat may not be on. Refer to

“Manual Output Test (Tracer ZN520),” p. 92

Diagnostic present

Unit configuration

No power to the controller

Unit wiring

ECM Motor /

Control Board

Failure

Hot water is present on a changeover unit

A specific list of diagnostics affects electric heat operation.

For more information, see

“Diagnostics,” p. 90 .

The controller must be properly configured based on the actual installed end devices and application. When the unit configuration does not match the actual end device, the electric heat may not work properly.

If the controller does not have power, electric heat does not operate. For the controller to operate normally, a 24 Vac input voltage must be applied. When the green LED is off continuously, the controller does not have sufficient power or has failed.

The wiring between the controller outputs and the electric heat contacts must be present and correct for normal electric heat operation. Refer to the typical unit wiring diagrams.

ECM controls include sophisticated fan proving / interlock circuitry that will disable electric heat if one or more motors are not performing normally

On units with changeover coil and electric heat, simultaneous operation of hydronic heat and electric heat is not allowed.

Table 32. Fresh air damper stays open (Tracer ZN520)

Probable

Cause Explanation

Normal operation

Manual output test

“Manual Output Test (Tracer ZN520),” p. 92

Unit configuration

The controller opens and closes the fresh air damper based on the controller’s occupancy mode and fan status.

Normally, the fresh air damper is open during occupied mode when the fan is running and closed during unoccupied mode.

Unit wiring

The controller must be properly configured based on the actual installed end devices and application. When the unit configuration does not match the actual end device, the damper may not work correctly.

The wiring between the controller outputs and the fresh air damper must be present and correct for normal damper operation. Refer to the typical unit wiring diagrams.

Table 33. Fresh air damper stays closed (Tracer ZN520)

Probable

Cause

Normal operation

Warmup and cooldown

Requested mode: off

Explanation

The controller opens and closes the fresh air damper based on the controller’s occupancy mode and fan status.

Normally, the fresh air damper is open during occupied mode when the fan is running and closed during unoccupied mode.

The controller includes both a warmup and cooldown sequence to keep the fresh air damper closed during the transition from unoccupied to occupied. This is an attempt to bring the space under control as quickly as possible.

It is possible to communicate the operating mode (such as off, heat, cool) to the controller. When off is communicated to the controller, the unit closes the fresh air damper.

Manual output test

“Manual Output Test (Tracer ZN520),” p. 92

Diagnostic present

Unit configuration

A specific list of diagnostics effects fresh air damper operation. For more information, see

“Diagnostics,” p. 90

The controller must be properly configured based on the configuration does not match the actual end device, the damper may not work correctly.

actual installed end devices and application. When the unit

No power to the controller

If the controller does not have power, the fresh air damper does not operate. For the controller to operate normally, a

24 Vac input voltage must be applied. When the green LED is off continuously, the controller does not have sufficient power or has failed.

Unit wiring The wiring between the controller outputs and the fresh air damper must be present and correct for normal damper operation. Refer to the typical unit wiring diagrams.

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Output Testing and Diagnostics

(UC400)

This section provides information about the following:

• Output testing

• Diagnostics

Note: For detailed description of LED activities and troubleshooting tips, refer to the section.

Output Testing (UC400)

Important: Do not directly overwrite the outputs.

Output testing can be accomplished by overriding the following analog and multistate value points in the desired state or position:

• Cool valve request

• DX cool request

• Economizer request

• Electric heat request

• Heat valve request

• Supply fan speed request

The points can be overridden on the Tracer TU analog or multistate pages by clicking on the Override icon in the control column. A higher priority (lower number) must be chosen over the current control setting.

Diagnostics (UC400)

Diagnostics are informational messages that indicate the operational status of the UC400 controller. In response to most diagnostics, the controller attempts to protect the equipment by enabling/disabling, or by opening/closing specific outputs. Other diagnostics provide information about the status of the controller, but have no effect on outputs. Diagnostics are reported in the order in which they occur. Multiple diagnostics can be present simultaneously. Diagnostic messages are viewed using the Tracer TU service tool or through a BAS.

Note: Tracer TU will report only active diagnostics.

Diagnostics Types (UC400)

Diagnostics are categorized according to the type of clearing method each uses and the type of information each provides.

The diagnostic types are:

• Manual (latching) diagnostics

• Automatic (non-latching) diagnostics

• Smart reset diagnostics

• Informational diagnostics

Note: Clearing diagnostics refers to deleting diagnostics from the software; it does not affect the problem that generated the message.

Manual (Latching) Diagnostics (UC400).

Manual diagnostics (also referred to as latching) cause the unit to

UV-SVN03F-EN

Diagnostics

shut down. Manual diagnostics can be cleared from the

UC400 controller in one of the following ways:

• By using the Tracer TU service tool to reset latching diagnostics on the Alarms Status tab or by temporarily overriding the Reset Diagnostic

Request (bv/2) on the Binary Status tab.

• Through a building automation system.

• By cycling power to the controller. When the 24Vac power to the controller is cycled OFF and then ON again, a power-up sequence occurs.

Automatic (Non-latching) Diagnostics (UC400).

Automatic diagnostics clear automatically when the problem that generated the diagnostic is solved.

Smart Reset Diagnostics (UC400).

Smart Reset

Diagnostics are latching diagnostics that will auto-recover if the condition is corrected. After the controller detects the first smart reset diagnostic, the unit waits 30 minutes before initiating the smart reset function. If another diagnostic of this type occurs again within 24 hours after an automatic clearing, clear the diagnostic manually by using any of the ways listed under the preceding section,

“Manual (Latching) Diagnostics (UC400).”

Informational Diagnostics (UC400).

Informational diagnostics provide information about the status of the controller. They do not affect machine operation, but can be cleared from the controller using the BAS or Tracer SC.

Table of Diagnostics (UC400)

Table 34

lists each diagnostic that can be generated by the

UC400 controller, the diagnostic effect on outputs

(consequences), and diagnostic type.

Note: The generic binary output is unaffected by diagnostics.

Table 34. UC4000 diagnostics

Diagnostic Probable Cause Consequences

Filter change required

Fan run hours exceed the time set to indicate filter change.

• Fan Unaffected

• Valves Unaffected

• Electric heat

Unaffected

Condensate overflow

The drain pan is full of water.

• Fan OFF

• Valves Closed

• Outdoor air damper

Closed

• DX/electric heat OFF

Low coil temp detection

Low airflow supply fan failure

The leaving fluid temperature may be close to freezing.

• Fan OFF

• Valves Open

• Outdoor air damper

Closed

• DX/electric heat OFF

The fan drive belt, contactor, or motor has failed.

• Fan OFF

• Valves Closed

• Outdoor air damper

Closed

• DX/electric heat OFF

Diagnostic

Type

Informational

Manual

Smart reset/

Manual

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Diagnostics

Table 34. UC4000 diagnostics (continued)

Diagnostic Probable Cause Consequences

Diagnostic

Type

Space temperature failure failure

(a)

Entering water temp

Invalid or missing value for zone temperature.

• Discharge air temperature control runs

• Unit shuts OFF if both space temperature and discharge air temperature fail

Automatic

Automatic • Fan Unaffected

(enabled)

• Valves Unaffected

• Outdoor air damper

Unaffected

• DX/electric heat

Unaffected

• Fan OFF

• Valves Open

• Outdoor air damper

Closed

• DX/electric heat OFF

Smart reset/ manual

Discharge air temp low limit

Discharge air temperature has fallen below the

Discharge Air

Temperature Low

Limit.

Discharge air temp

failure (a)

Outdoor air temp failure

Invalid or missing value for discharge air temperature.

• Simplified zone control algorithm runs

• Unit shuts OFF if zone temperature fails

Automatic

Automatic Invalid or missing value for outdoor air temperature.

• Fan Unaffected

• Valved Unaffected

• Outdoor air damper

Minimum

Position

• DX cooling/electric heat unaffected

Humidity input failure

Invalid or missing value for relative humidity.

• Fan Unaffected

• Valves Unaffected

• Outdoor air damper

Unaffected

• DX cooling/electric heat Unaffected

Automatic

Informational CO

sensor failure

Generic AIP failure

Local fan mode failure

Local setpoint failure

Invalid or missing value for CO

Invalid or missing value for generic analog input.

Invalid or missing fan-speed switch

(reverts to default

fan speed).

Invalid or missing value for zone temperature setpoint (reverts to

default setpoint).

• Fan Unaffected

• Valves Unaffected

• Outdoor air damper

Unaffected

• DX cooling/electric heat Unaffected

• Fan Unaffected

• Valves Unaffected

• Outdoor air damper

Unaffected

• DX cooling/electric heat Unaffected

• Fan Unaffected

• Valves Unaffected

• Outdoor air damper

Unaffected

• DX cooling/electric heat Unaffected

• Fan Unaffected

• Valves Unaffected

• Outdoor air damper

Unaffected

• DX cooling/electric heat Unaffected

Informational

Automatic

(a) For detailed information about zone temperature control methods, refer to

“Zone Temperature Control (UC400),” p. 81 .

Troubleshooting (Wireless

Controls)

Locations of LEDs, Test button, Test Symbols, and Error Codes

The receiver for all models has four LEDs: LED1, LED2,

LED3, and LED5. Figure 65 shows their locations.

Note: To view LEDs on a flush mount receiver on a fancoil unit, the front panel of the unit must be removed.

Figure 65.

LED locations on the receiver

LED1

LED2

LED3

LED5

The sensor for model WZS have four LEDs: LED1, LED2,

LED3, and LED5. The sensor for model WDS has test symbols and error codes that appear on the display. All three sensor models have a Test button.

Figure 66 shows

their locations.

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Figure 66.

LED, Test button, and symbol locations on the sensor

LED1

LED2

LED3

LED5

Test button

Test symbols

Error code

WZS sensor

Test button

WDS sensor

Diagnostics (Wireless Controls)

LED1, LED2, and LED3, located on the sensor of model

WZS respond to diagnostics by exhibiting specific blinking patterns. View their response by pressing the Test button

(see

Table 35, p. 97 ).

Diagnostics

Error codes appear on the display of the model WDS sensor when diagnostics occur (see

Table 35 ).

Table 35. Diagnostics on the sensor (wireless controls)

LED state when Test button is pressed (WZS sensor)

Error code

(WDS sensor display) Indicates...

N/A E0, E5, E7

Sensor failure

• Replace sensor

Disassociated

• Sensor is not associated with a receiver.

LED1: Off

LED2: Off

LED3 (a) : 1-blink pattern repeated 3 times

LED1: Off

LED2: Off

LED3

(a)

: 2-blink pattern repeated 3 times

LED1: Off

LED2: Off

LED3

(a)

: 3-blink pattern repeated 3 times

LED1: Off

LED2: Off

LED3

(a)

: 4-blink pattern repeated 3 times

Address set to 000

• Address not set to between

001–999.

Software error

• Replace sensor

Input voltage too high

• No RF transmission is permitted with an input battery voltage greater than

3.9 V.

(a) Blink pattern is On for 1/4 s, Off for 1/4 s, with 2 s Off between repetitions.

LED1, LED2, and LED3, located on the receiver of all models, respond to diagnostics by exhibiting specific blinking patterns. They respond independently of any user action (see

Table 36 ).

Table 36. Diagnostics on the receiver (wireless controls)

LED state

LED1: Off

LED2: Off

LED3: 1-blink pattern repeated continuously (a)

Indicates...

Disassociated

• Receiver is not associated, waiting for a sensor.

• Receiver lost communication with sensor.

• Receiver has no devices on its wireless personal area network.

• Association with a device has been manually removed.

Address set to 000

• Address not set to between 001–999.

LED1: Off

LED2: Off

LED3: 2-blink pattern repeated continuously

(a)

LED1: Off

LED2: Off

LED3: 3-blink pattern repeated continuously

(a)

Not configured

• Receiver configuration properties not properly set (defective receiver).

(a) Blink pattern is On for 1/4 s, Off for 1/4 s, with 2 s Off between repetitions.

Testing Signal Strength (Wireless Controls)

To initiate a signal strength test, push the Test button on

the sensor (see location of Test button in Figure 66, p. 97 ).

• Models WZS: LED1, LED2, and LED3 respond by indicating signal strength. You can view them on the

sensor ( Table 37 ) and the receiver ( Table 38

• Model WDS: Test symbols on the sensor display indicate signal strength (

Table 37

). LED1, LED2, and

LED3, on the receiver, respond by indicating signal strength (

Table 38

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Diagnostics

Table 37.

Observing signal strength on the sensor

(wireless controls)

User action

LED state

(WZS sensors)

Symbol (WDS sensor display) Indicates...

None LED1: Off

LED2: Off

LED3: Off

Press Test button on the sensor

LED1: Off

LED2: Off

LED3: Off

No Test symbols appear

Normal state

• No Test button press.

LED1: On

LED2: On

LED3: On

Displays for 5 seconds, then constantly Off

Associated; no communication with receiver

• Associated, but no signal from the receiver after pressing Test button.

Excellent signal strength

• Good signal margin for reliable communication.

LED1: Off

LED2: On

LED3: On

Displays for 5 seconds, then constantly Off

LED1: Off

LED2: Off

LED3: On

Displays for 5 seconds, then constantly Off

Satisfactory signal strength

• Adequate signal strength for reliable communication.

• Moving sensor or receiver may improve signal strength.

• Increased channel switching may reduce battery life.

Poor signal strength

• Unreliable communication.

• Strongly recommend moving the sensor or receiver to a better location.

Table 38. Observing signal strength on the receiver

(wireless controls)

User action

None

Press

Test button on the sensor

LED state (receiver, all models) Indicates...

LED1: Off

LED2: Off

LED3: Off

Normal state

• No Test button press.

LED1: On

LED2: On

LED3: On

Displays for 5 seconds, then constantly Off

Excellent signal strength

• Good signal margin for reliable communication.

LED1: Off

LED2: On

LED3: On

Displays for 5 seconds, then constantly Off

Satisfactory signal strength

• Adequate signal strength for reliable communication.

• Moving sensor or receiver may improve signal strength.

• Increased channel switching may reduce battery life.

LED1: Off

LED2: Off

LED3: On

Displays for 5 seconds, then constantly Off

Poor signal strength

• Unreliable communication

• Strongly recommend moving the sensor or receiver to a better location

Testing Battery Status (Wireless Controls)

Initiate a battery status test as follows:

• On model WZS, push the Test button on the sensor (see

location on Figure 66, p. 97 ). LED5 on the sensor

responds by indicating the level of battery strength, as shown in

Table 39, p. 98

• On model WDS, push the Test button on the sensor

(see location on Figure 66, p. 97

). In response, a battery test symbol appears on the display. The symbol shown

indicates battery life expectancy (see Table 40 ).

Table 39. Battery status: LED5 on model WZS sensors

(wireless controls)

User action LED state (WZS)

Press

Test button

Solid red for 5 seconds

Indicates...

Solid green for 5 seconds Battery is adequate for proper operation.

No light

25% battery life left. Batteries should be replaced.

Batteries life expired or not installed properly, or sensor is defective.

None Blinking red: 1-blink pattern (a) repeated 5 times. Cycle repeats every 15 minutes.

Approximately 14 days of operation remain before the battery is too weak to power the sensor.

(a) Blink pattern is On for 1/4 s, Off for 3/4 s, with 2 s Off between repetitions.

Table 40. Battery status: Battery symbol on model WDS sensor display (wireless controls)

User action

Press Test button

Battery test symbol Indicates...

Full battery power.

50% battery life left.

25% battery life left. Replace batteries.

Flashing symbol indicates that approximately 14 days of operation remain before the battery is too weak to power the sensor.

24 V Power Status Indicator (Wireless Controls

LED5 on the receiver of all models (

Figure 65, p. 96

) lights and stays constantly On when 24 V power is normal.

Using the Wireless Sensor System to Check

Signal Strength on a Site (Wireless Controls)

Follow these steps to check the signal strength on a site:

Power up a receiver with a 24 V transformer (user supplied)

2. Associate the sensor to a receiver of the same model intended for the job

3. Place the receiver at the desired location

4. Place or hold the sensor at the desired location

5. Press the Test button (S5) on the sensor and observe the signal strength as indicated by LED1, LED2, and

LED3 on model WZS, and on the display on model

WDS (

Figure 66, p. 97

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Diagnostics

For more information on interpreting the LEDs and the display symbols that indicate signal strength, see

“Testing

Signal Strength (Wireless Controls),” p. 97

Replacing Sensor Batteries (Wireless Controls)

Sensor battery type, length of life, and installation are addressed in this section.

Battery Type (Wireless Controls)

NOTICE:

Equipment Damage!

The batteries are manufactured in a ready-to-use state.

They are not designed for recharging. Recharging can cause battery leakage or, in some cases, can cause the safety release vent to open.

NOTICE:

Equipment Damage!

Do not attempt to hook up the sensor to a power supply. Equipment damage may result.

Use two non-rechargeable 1.5 V lithium AA batteries in the sensor. To maintain UL rating, use only UL-listed lithium batteries. The sensor ships with Energizer ® L91 batteries already installed. Replacement batteries are available at

Trane Service Parts Centers (p/n X13770035010) or other local suppliers.

Battery Life (Wireless Controls)

Battery life is five years under normal conditions. If the sensor is not used for an extended period of time, do one of the following:

• Set the sensor address to 000 to place the sensor into a low-power hibernation mode.

• Remove the batteries

Notes:

• If lithium batteries are temporarily unavailable, alkaline batteries can be used. However, alkaline battery life is very short by comparison.

• The battery life for a model WDS may decrease with extended LCD display activity.

Battery Installation (Wireless Controls)

Prevent Injury!

WARNING

Batteries can explode or leak and cause burns if installed backwards, disassembled, charged, or exposed to water, fire, or high temperature.

WARNING

Prevent Injury!

Keep away from small children. If swallowed, contact your local poison control center immediately.

6. Observe the polarity indicators that are molded into the cover.

Install two batteries (of the type specified in

“Battery

Type (Wireless Controls),” p. 99 ) in the battery-holding

slot that is molded into the sensor cover.

The sensor has been designed to prevent damage if the batteries are installed backwards, to reduce the potential for injury.

Manual Association (Wireless Controls)

Before attempting manual or automatic association, the receiver must indicate readiness to associate (one blink

pattern of LED3 on receiver). Refer to “Observing the

Receiver for Readiness to Associate,” p. 33

At any time, the manual association method can be used to associate the receiver with the sensor. If an association was previously established between a receiver and a sensor and needs to be re-established, the manual association process may be used. If an association has not yet been established, the automatic association process is

Receiver,” p. 33 ).

8. Using a small screwdriver, set the three rotary address switches (

Figure 39, p. 33 , locations S1, S2, S3) on the

receiver to an address between 001 and 999.

Notes:

• An address can be changed without powering down the receiver or sensor.

• An address can be changed at any time after initial association has been established.

9. Set the three rotary address switches ( Figure 39, p. 33 ,

locations S1, S2, S3) on the sensor to the same address as the receiver.

10. Record the address and location of the receiver and sensor pair.

• After verifying that the receiver and sensor are powered up, press the Test button on the sensor to

establish that the signal strength ( “Testing Signal

Strength (Wireless Controls),” p. 97 ) and the battery

life “Testing Battery Status (Wireless Controls),” p. 98 ) are adequate for proper functioning.

Disassociation (Wireless Controls)

The receiver disassociates from the sensor (by removing all stored association information), conducts a channel scan, and restarts itself, if any of the following are true:

• The receiver address is changed from its current setting (001–999)

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Diagnostics

• The receiver receives a disassociation notification from its associated sensor

• The receiver does not receive a communication from its associated sensor within 50 minutes.

• The sensor and receiver are associated and communicating at the time the sensor is set to 000 and the Test button is pressed.

Note: A disassociated sensor will transit an association request every 10 minutes.

Sensor/Receiver Compatibility (Wireless

Controls)

Version 1.5 (p/n X13790854 and X13790855) and higher receivers are compatible with all sensors models and support all functions. Receivers released prior to version

1.5 are compatible with only model WZS.

Replacing a Failed Sensor or Receiver

(Wireless Controls)

Note: Receivers ship installed on the unit. To remove the receiver, press in the retention tabs on the underside of the receiver enclosure and push upward.

To replace a failed sensor or receiver:

11. Confirm that the device is disassociated (see Table 35 and Table 36, p. 97 ).

12. Set the rotary address switch of the new device to match the address of the remaining sensor or receiver.

Note: There is no need to remove power from the remaining device.

13. Apply power to the new device. Association between the new and the remaining devices will automatically occur.

Note: When replacing a WDS sensor, the receiver

(version 1.5 or higher) will automatically configure the sensor to match the last stored configuration, if the sensor has not been placed into configuration mode and the factory default configuration is still valid. If the sensor configuration does not match the desired system features, it can be manually configured (see

“Manual Association (Wireless

Controls),” p. 99

Servicing and Testing (Wireless Controls)

If the wireless sensor system is not working as expected, use the tools and procedure described in this section.

Servicing and Testing Tools (Wireless Controls)

No special tools or software are necessary to service and test the wireless sensor system. Test the system by using:

• The LEDs on the receiver, LEDs on the model WZS sensor, and the display on the model WDS sensor

• The Test button on the sensor

• The address test mode on the receiver

100

• A common volt-ohm meter

Procedure for Testing the Wireless Sensor System

(Wireless Controls)

If the wireless sensor system is not working as expected:

Observe LED5 on the receiver. LED5 is On solid green whenever the receiver is powered.

2. Verify that the receiver is properly grounded. Both the

GND-SIGNAL (black) wire and the GND-POWER

(yellow) wire must be grounded.

3. Press the Test button on the sensor.

• Model WZS: LED5 should turn On solid green, indicating proper battery strength. LED1, LED2, and

LED3 will indicate signal strength.

Note: When checking signal strength, both LED1 and LED3 on the receiver and sensor illuminate in unison if the sensor and receiver are associated. Use this feature to confirm association.

• Model WDS: Battery life (

“Testing Battery Status

(Wireless Controls),” p. 98 ) and signal strength

( “Testing Signal Strength (Wireless Controls),” p. 97 ) are indicated on the display.

Procedure for Testing the Receiver (Wireless

Controls)

If the receiver is not working as expected:

Verify that the receiver is powered.

2. Set the receiver address to 000 to force the zone temperature output and zone temperature setpoint output to their default mode values (see

“Output

Values—Failure and Default Modes of Operation

(Wireless Controls),” p. 101

3. Measure the receiver output resistance (see

“Measuring Output Resistance (Wireless Controls),” p. 101

4. When the test is complete, reset the receiver address to its previous setting.

5. Press the Test button on the sensor to force reassociation.

6. Confirm association and communication by noting

LED1, LED2, and LED3 as described in “Testing Signal

Strength (Wireless Controls),” p. 97 .

Forcing a Sensor to Transmit (Wireless Controls)

To force a wireless sensor to transmit during servicing, press the Test button on the sensor.

Output Power Level (Wireless Controls)

The maximum output power level of a wireless sensor set is controlled by software and restricted by channel of operation and agency requirements per country or region.

The sensor has a default maximum power level of 10 mW,

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Output Values—Failure and Default Modes of

Operation (Wireless Controls)

The following table provides output values for failure and default modes of operation, which can be used for troubleshooting.

Table 41.

Output values

Situation

Zone temperature output

Zone setpoint output

Heating setpoint output

Fan/

System output

Receiver address = 000 11.17 kΩ,

72.5°F

(22.5°C), indefinitely

Receiver address = 001 to 999 and:

Receiver is powered up, but not is associated, or

Receiver has received a disassociation request from the associated sensor.

11.17 kΩ,

72.5°F

(22.5°C) Hold for 15 minutes, then open

Receiver address = 001 to 999 and receiver has not received a communication within

35 minutes from the associated sensor.

Open

451 Ω,

72.5°F

(22.5°C), indefinitely

501 Ω,

70.5°F

(21.4°C), indefinitely

451 Ω,

72.5°F

(22.5°C),

Hold for 15 minutes, then open

Open

501 Ω,

70.5°F

(21.4°C), indefinitely

Open

2320 Ω

Fan =

Auto

System

= Off

2320 Ω

Fan =

Auto

System

= Off

Open

Receiver has no power. Open

Thermistor in sensor has failed to either open or close.

Open

Normal value

Setpoint potentiometer has failed to either open or close.

Normal value Open

Open

Normal value

Open

N/A

Measuring Output Resistance (Wireless

Controls)

To measure the resistance of receiver outputs for zone temperature and setpoints for all models, and heating setpoint and fan/system for the WDS:

Ensure that the GND-SIGNAL (black) wire and the

GND-POWER (yellow) wire are grounded to the transformer.

2. Disconnect the ZONE (white) and SETPOINT (RED) wires from the controller. Disconnect the HEAT

SETPOINT (brown) and FAN/SYSTEM (green) wires from the controller, if applicable.

3. Measure resistance as follows: a. All models: Measure between the grounded GND-

SIGNAL (black) wire and either the SETPOINT (red) or ZONE (white) wire. Compare resistance

measurements to those in Table 42, p. 101 .

b. WDS only: Measure between the grounded GND-

SIGNAL (black) wire and the FAN/SYSTEM (green) wire. Compare resistance measurements to those given in

Table 43, p. 101 .

Note: The output circuits are not electrically powered; consequently, resistance can be

UV-SVN03F-EN

Diagnostics

measured without risk of damage to the volt-ohm meter.

Table 42. Receiver resistance table for all models

(wireless controls)

Zone or setpoint temperature

55°F (12.8°C)

60°F (15.6°C)

65°F (18.3°C)

70°F (21.1°C)

75°F (23.9°C)

80°F (26.7°C

85°F (29.4°C)

Nominal zone temperature output resistance

Nominal setpoint and heating setpoint output resistance

17.47 kΩ

15.3 kΩ

13.49 kΩ

11.9 kΩ

10.5 kΩ

9.3 kΩ

8.25 kΩ

792 Ω

695 Ω

597 Ω

500 Ω

403 Ω

305 Ω

208 Ω

Table 43. Receiver resistance table for model WDS

(wireless controls)

Fan command

High

Med

Low

Auto

Off

Nominal output resistance

16,130 Ω

13,320 Ω

10,770 Ω

2320 Ω

4870 Ω

Cleaning the Sensor (Wireless Controls)

NOTICE:

Equipment Damage!

Spraying glass cleaner or any other solution directly on the sensor may damage it.

You can clean the sensor by applying glass cleaner to a soft, non-abrasive cloth, and gently wiping the face, including the buttons and LCD display. Use of a premoistened towelette designed for lens or screen cleaning is also acceptable.

Avoid inadvertent pressing of the Occupied/Unoccupied buttons on the keypad on the WDS sensor as this may result in an unwanted timed override or settings change.

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Diagnostics

Troubleshooting (Tracer ZN520)

Green STATUS LED

Indicates Whether the Controller is Powered On (24 Vac Supplied)

Yellow COMM LED

Indicates if Communication is Functioning

Red SERVICE LED

Indicates if Service is Needed

Red SERVICE LED

(Tracer ZN520)

During normal operation, the LED is off continuously when power is applied to the controller.

If the LED is on continuously, even when power is applied to the controller means that someone is pressing the

SERVICE button or that the controller has failed.

If the LED flashes once every second, use Rover, Trane’s service tool, to restore the unit to normal operation. Refer to the Rover product literature for more information.

Note: If the Service button is held down for more than

15 seconds on the Tracer ZN520 controller, it will uninstall itself from the ICS communication network and shut down all unit operation.

Green STATUS LED

(Tracer ZN520)

During normal operation, the LED is on continuously.

If the LED blinks once, the controller is in Manual output test mode.

If the LED blinks twice the controller is in Manual output test mode, with one or more diagnostics present.

If the LED blinks (1/4 second on, 1/4 second off for 10 seconds) the controller is in the “Wink” mode.

Note: The “wink” feature allows the identification of a particular controller. When sending a request from a device, such as Rover, the controller will “wink” to indicate it received the signal.

102

If the LED is off, either the power is off, an abnormal condition is present or the TEST button is pressed.

Yellow COMM LED

(Tracer ZN520)

If the LED is off continuously, the controller is not detecting any communication. This is normal for units in standalone applications.

If the LED blinks, the controller detects communication.

If the LED is on continuously, this indicates an abnormal condition.

Manual Output Test

(Tracer ZN520)

The purpose of the manual output test sequence is to verify output and end device operation. Use the manual output test to:

• Verify output wiring and operation without using

Rover, service tool

• Force the water valve to open and balance the hydronic system

Note: The manual output test is not an automatic cycle.

You must press the TEST button to proceed through each step.

The controller observes all diagnostics that occur during the test sequence. Although an automatic diagnostic reset sequence exists as part of the controller’s normal operation, the automatic diagnostic reset feature is not active during the test sequence.

If left in an individual test step, the controller remains in test mode for 60 minutes and then exits to normal operation.

Many service calls are due to unit diagnostics. The test sequence resets unit diagnostics and attempts to restore normal unit operation prior to testing the outputs. If the diagnostics remain after a reset, the STATUS LED indicates the diagnostic condition is still present (two blinks).

Manual Output Test Procedure

(Tracer

ZN520)

Follow the procedure below to test Tracer ZN520 controllers.

Press and hold the TEST button for at least two seconds (not exceeding 5 seconds), and then release, to start the test mode.

2. The test sequence will turn off all outputs and then attempt to clear all diagnostics.

3. Press the TEST button several more times (no more than once per second) to advance through the test sequence.

The outputs are not subject to minimum times during the test sequence. However, the test sequence only permits one step per second which limits minimum output time.

The green LED is turned off when the TEST button is pressed. To begin the manual output test mode, press and hold the TEST button (turning off the green LED) for at least

UV-SVN03F-EN

UV-SVN03_.book Page 103 Thursday, January 24, 2013 5:27 PM two seconds.The green LED will begin to blink, indicating the controller is in test mode.

Table 44. Test sequence for 1-heat/1-cool configurations

(Tracer ZN520)

Steps

1. Off

2. Fan High

Fan

BOP1-3

Off

High

Cool

Output

BOP4 (a)

Off

Heat

Output

BOP5

Off

Damper

BOP6

Closed

3. Fan Medium

4. Fan Low

5. Cool

Medium Off

Low

High

Off

Closed

6. Heat

8. Exit

High

7. Fresh Air Damper (b) High

(c)

Off

Closed

Open

Note:

For all 1-heat/1-cool applications including 2-pipe changeover, BOP4 energizes in the cooling test stage and BOP5 energizes in the heat test stage.This occurs even though during normal 2-pipe changeover operation BOP4 controls the unit valve for both cooling and heating.

(a) At the beginning of the Fan High step, the controller attempts to clear all diagnostics.

(b) The fresh air damper (BOP6) only energizes during this step if binary output 6 has been configured as a fresh air damper.

(c) After the Fresh Air Damper step, the test sequence performs the Exit step.This initiates a reset and attempts to return the controller to normal operation.

Diagnostics

Troubleshooting (UC400)

Table 45

through Table 50, p. 105 provide troubleshooting

information if encountering operational problems with the

UC400 controller.

Table 45. Fan does not energize (UC400)

Probable

Cause

Unit wiring

Explanation

The wiring between the controller outputs and the fan relays and contacts must be present and correct for normal fan operation. Refer to applicable wiring diagram.

The fan motor and relay must be checked to ensure proper operation.

Failed end device

Normal operation

No power to the controller

Diagnostic present

Unit configuration

The fan will turn OFF when:

• The controller receives a communicated off signal

• The fan-speed switch is set to OFF if no communicated value is present

• Specific diagnostics are generated

• The default fan speed is set to OFF and the fan is operating in the Auto mode.

If the controller is in unoccupied mode, the fan cycles between OFF and the highest fan speed.

If the controller does not have power, the unit fan does not operate. For the controller to operate normally, it must have an input voltage of 24 Vac. If the Marquee/Power LED is OFF continuously, the controller does not have sufficient power or has failed.

Several diagnostics affect fan operation. For detailed information about these diagnostics, refer to

Table 34, p. 95 .

The controller must be properly configured based on the actual installed end devices and application. If the unit configuration does not match the actual end device, the fans may not work correctly.

Random start observed

Cycling fan operation/ continuous

Unoccupied operation

After power-up, the controller always observes a random start from 5 to 30 seconds. The controller remains OFF until the random start time expires.

The controller continuously operates the fan when in the occupied, occupied standby, or occupied bypass mode.

When the controller is in the unoccupied mode, the fan is cycled between high speed and OFF with capacity.

Even if the controller is configured for continuous fan operation, the fan normally cycles with capacity during unoccupied mode. While unoccupied, the fan cycles ON or

OFF with heating/cooling to provide varying amounts of heating or cooling to the space.

Fan mode off If a local fan mode switch determines the fan operation, the

OFF position controls the fan to off.

Requested mode off

The user can communicate a desired operating mode (such

as OFF, heat, and cool) to the controller. If OFF is communicated to the controller, the unit controls the fan to off. There is no heating or cooling.

UV-SVN03F-EN

Table 46. Valves remain closed (UC400)

Probable

Cause

Unit wiring

Explanation

The wiring between the controller outputs and the valve(s) must be present and correct for normal valve operation.

Refer to applicable wiring diagram.

The valves must be checked to ensure proper operation.

Failed end device

No power to the controller

Diagnostic present

Normal operation

If the controller does not have power, the unit valve(s) will not operate. For the controller to operate normally, apply an input voltage of 24 Vac. If the Marquee/Power LED is

OFF continuously, the controller does not have sufficient power or has failed.

Several diagnostics affect valve operation. For detailed information about these diagnostics, refer to

Table 34, p. 95 .

The controller opens and closes the valves to meet the unit capacity requirements.

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Diagnostics

Table 46. Valves remain closed (UC400) (continued)

Probable

Cause

Unit configuration

Explanation

The controller must be properly configured based on the actual installed end devices and application. If the unit configuration does not match the actual end device, the valves may not work correctly.

Random start observed

Requested mode off

After power-up, the controller always observes a random start from 5 to 30 seconds. The controller remains OFF until the random start time expires.

The user can communicate a desired operating mode (such as OFF, heat, and cool) to the controller. If OFF is communicated to the controller, the unit controls the fan to off. There is no heating or cooling.

Entering water temperature sampling logic

The controller includes entering water temperature sampling logic, which is automatically initiated during

2-pipe and 4-pipe changeover, if the entering water temperature is either too cool or too hot for the desired heating or cooling.

Valve configuration

Ensure the valves are correctly configured, using the Tracer

TU service tool, as normally open or normally closed as dictated by the application.

Table 47.

Valves remain open (UC400)

Probable

Cause

Unit wiring

Explanation

The wiring between the controller outputs and the valve(s) must be present and correct for normal valve operation.

Refer to applicable wiring diagram.

The valves must be checked to ensure proper operations.

Failed end device

Normal operation

Diagnostic present

Unit configuration

Entering water temperature sampling logic

The controller includes entering water temperature sampling logic, which is automatically initiated during 2pipe and 4-pipe changeover, if the entering water temperature is either too cool or too hot for the desired heating or cooling.

Valve configuration

The controller opens and closes the valves to meet the unit capacity requirements.

Several diagnostics affect valve operation. For detailed information about these diagnostics, refer to

Table 34, p. 95 .

Freeze avoidance

Ensure the valves are correctly configured, using the Tracer

TU service tool, as normally open (NO) or normally closed

(NC) as dictated by the application.

When the fan is OFF with no demand for capacity (0%), and the outdoor air temperature is below the freeze avoidance setpoint, the controller opens the water valves

(100%) to prevent coil freezing. This includes unoccupied mode when there is no call for capacity or any other time the fan is OFF.

Table 48. DX or electric heat does not energize (UC400)

Probable

Cause

Unit wiring

Failed end device

No power to the controller

Diagnostic present

Normal operation

Unit configuration

Requested mode off

Freeze avoidance

Explanation

The wiring between the controller outputs and the end devices must be present and correct for normal operation.

Refer to applicable wiring diagram.

Check the control contactors or the electric heat element, including any auxiliary safety interlocks, to ensure proper operation.

If the controller does not have power, heat outputs do not operate. For the controller to operate normally, apply an input voltage of 24 Vac. If the Marquee/Power LED is OFF continuously, the controller does not have sufficient power or has failed.

Several diagnostics affect DX and electric heat operation.

For detailed information about these diagnostics, refer to

Table 34, p. 95 .

The controller controls compressor or electric heat outputs as needed to meet the unit capacity requirements.

The controller must be properly configured based on the actual installed end devices and application. If the unit configuration does not match the actual end device, DX or electric heat may not operate correctly.

The user can communicate a desired operating mode (such as OFF, heat, and cool) to the controller. If OFF is communicated to the controller, the unit shuts off the compressor or electric heat.

When the fan is OFF with no demand for capacity (0%), and the outdoor air temperature is below the freeze avoidance setpoint, the controller disables compressors and electric heat outputs (100%) to prevent coil freezing.

This includes unoccupied mode when there is no call for capacity or any other time the fan is OFF.

Table 49. Outdoor air damper remains closed (UC400)

Probable

Cause

Unit wiring

Explanation

The wiring between the controller outputs and the outdoor air damper must be present and correct for normal outdoor air damper operation. Refer to applicable wiring diagram.

Check damper actuator to ensure proper operation.

Failed end device

No power to the controller

Diagnostic present

Normal operation

Unit configuration

Warm-up and cool-down sequence

Requested mode off

If the controller does not have power, the outdoor air damper does not operate. For the controller to operate normally, apply an input voltage of 24 Vac. If the Marquee/

Power LED is OFF continuously, the controller does not have sufficient power or has failed.

Several diagnostics affect outdoor air damper operation.

For detailed information about these diagnostics, refer to

Table 34, p. 95 .

The controller opens and closes the outdoor air damper based on the controller’s occupancy mode and fan status.

Normally, the outdoor air damper is open during occupied mode when the fan is running and closed during unoccupied mode.

The controller must be properly configured based on the actual installed end devices and application. If the unit configuration does not match the actual end device, the outdoor air damper may not work correctly.

The controller includes both a morning warm-up and cooldown sequence to keep the outdoor air damper closed during the transition from unoccupied to occupied. This is an attempt to bring the space under control as quickly as possible.

The user can communicate a desired operating mode (such as OFF, heat, or cool) to the controller. If OFF is communicated to the controller, the unit closes the outdoor air damper.

104 UV-SVN03F-EN

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Diagnostics

Table 50. Outdoor air damper remains open

Probable

Cause

Unit wiring

Explanation

The wiring between the controller outputs and the outdoor air damper must be present and correct for normal outdoor air damper operation. Refer to applicable wiring diagram.

Check damper actuator to ensure proper operation.

Failed end device

Normal operation

Unit configuration

The controller opens and closes the outdoor air damper based on the controller occupancy mode and fan status.

Normally, the outdoor air damper is open during occupied mode when the fan is running and closed during unoccupied mode. (Refer to the section,

“Modulating

Outdoor/Return Air Damper (UC400),” p. 84 .)

Troubleshooting (ECM)

WARNING

Hazardous Voltage w/Capacitors!

UV-SVN03F-EN

WARNING

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

• The adapter boards contain high voltage.

Configuration adjustments to the ECM engine board should be made through the SMALLER of the two low-voltage lids on the front of the control panel, through the low-voltage insulation/shielding.

• Initial hookups to the CSTI and standard adapter boards, including low voltage interconnections, must be made with the power off.

• Do not make connections to the motors or the adapter boards while power is ON. Do not remove connections to the motor or the adapter boards while the power is ON.

Notes:

• The new Trane BLDC system is a closed loop system that has equipment protections and envelope enforcements. Do not assume that the motor has failed without first consulting the ECM engine status/ diagnostics screen. In many cases, the engine shuts down the motor operation and locks it out to prevent equipment damage.

• Electric Heat operation and Changeover Coil control on

CSTI units are co-coordinated by the ECM engine board. Changeover function on Tracer ZN units can also be affected by incorrect configuration of the ECM engine or improper wiring of terminals to analog

105

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Diagnostics

input 1 on the Tracer ZN controller (polarity sensitivity).

• The mini-access lid on the front of the main control panel lid has the ECM engine troubleshooting/setup guide affixed to the back of the lid. This guide is unitspecific and should be consulted before determining the disposition of a unit.

General Information (ECM)

The ECM engine oversees and monitors all motor operations and changes to speed resulting from:

• Direct Fan Speed Requests

– Customer Fan Speed Switches

– Thermostat Fan Speed, On or 0–10V requests

– Automatic Fan Request from Tracer ZN / UC controllers

• Indirect Fan Speed Requests

– Electric Heat requests will bring the fan to the proper speed.

• Conflicting Fan Speed Requests

– If two or more commands are received (direct or indirect), the fan will honor the higher speed requested.

Note: In some cases, indirect requests will result in fan behavior change regardless of whether the enddevice fails to actuate (due to device failure, or safety/down-stream lockouts).

The ECM engine board also coordinates the operation of

Electric Heat, Electric/Hydronic Heat lockouts, and CSTI

Changeover coil operation.

Troubleshooting Information (ECM)

General system troubleshooting tips (ECM)

• ECM engine configuration must perfectly match the factory-supplied ECM.

– Refer to

“ECM Overview and Setup,” p. 45 for

troubleshooting configuration of the engine board.

• The ECM engine will display troubleshooting information, and contains dual tachometers to aid in performance verification.

• Under normal circumstances, the ECM engine display will display the operational status of the motors and electric heat circuit/sensors, however, a malfunction will drive a priority display mode that will present the error code instantly to the screen. The error must be cleared by solving by powering down, removing the cause of the problem and restarting the engine board.

• Engine Label setup document (affixed to the back of the low voltage access lid) should be used to verify engine configuration settings.

• For proper operation of the system, all plugs must be firmly seated in all boards and motors. Insecure

106 connections will cause malfunction and the system will shutdown.

• Do not unplug or plug-in motors or connectors while the system is receiving a speed request of any kind.

The system must be powered down before plugging or un-plugging connections to the adapter boards, engine boards or motors. Failure do so will register diagnostics or cause unsafe operation and reduction in the contact life of the connectors.

• The motor will not spin if plugged in while the ECM engine is requesting power.

Troubleshooting a motor that does not spin, or spins too slowly (ECM)

The motor connections and motor plug connections to the adapter boards should be secure. Unit should be powered off to check the fit of the connectors.

When configured correctly, the system will always respond positively to direct, indirect, and conflicting speed requests with very few exceptions:

These exceptions are:

If a motor has been locked out due to engine locked rotor protection:

– Assuming Motor 1 has an obstruction. In this case, the “Status Display” will be interrupted to display:

 →  → 

Solution: i. Remove obstruction from the fan wheel.

ii. Ensure that motor plugs and all plugs to adapter boards and the ECM engine board are secure iii. Verify that the configuration does not specify a motor that is physically missing. Most units require only one motor. The controller is made aware of the missing motor by specifying all speeds related to Motor 2 to 0 rpm.

iv. Verify that



and



, the low motor signal output limits, are set correctly.

2. If a motor has been locked out due to overspeed or runaway condition:

– Assuming Motor 1 has an overspeed condition. In this case, the “Status Display” will be interrupted to display:

 →  → 

Solution: i. Ensure that set-screw is attached firmly to the motor shaft.

ii. Ensure that motor plugs and all plugs to adapter boards and the ECM engine board are secure.

iii. Verify that the configuration does not specify a speed lower than 450 rpm for the affected motor.

Speeds below 450 rpm are not supported on fancoil units.

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3. VSP Inputs (0–10V inputs) are of the wrong polarity

– Verify that variable speed (VSP) inputs are properly wired to 1TB4.

Notes:

• Do not short the courtesy 10 Vdc supply to chassis or loads that require greater than 10 mA of DC current.

• Please observe proper polarity of 0–10 Vdc inputs.

Failure to observe proper polarity can cause failure of the ECM engine board, the customer-supplied controller or the Tracer ZN controller.

4. Customer Controller output signal to VSP Inputs are too low.

Note: If the customer supplied controller outputs signals that are below the noise threshold, they will be ignored by the ECM Engine.

– The ECM Engine board contains an adjustable noise floor parameter,



that can be configured to reject signals below the noise floor.

– If the noise floor parameter is set too high, it can be lowered as long as there are acceptable noise levels on the inputs lines.

Troubleshooting a motor that spins too fast, or spins without any apparent speed request

(ECM)

Typical equipment and controls design practice will ensure that the fans will come on if there is a call for heat, cool, or ventilation. In most cases, we will depend on the controller/thermostat to call for the fan to come on when appropriate, but during calls for electric heat, or calls for heat on CSTI units equipped with electric heat, as a call for the appropriate fan speed. This behavior, as described previously, is an indirect request.

When a call for electric heat is made, the system will positively drive the fan on to the correct speed, regardless of whether the controller has asked for fan operation or not. The unit design incorporates an interlock instead of a lock-out. (It does not lock out electric heat if the fan is set to off; it brings the fan on.)

Notes:

• In many cases, indirect requests will result in fan behavior change regardless of whether the end-device fails to actuate (due to device failure, or safety/downstream lockouts). If there is hot water available on CSTI units with changeover coils and electric heat, we will still drive the fan to the appropriate electric heat speed.

• The new fan coil designs incorporate sophisticated fan interlocks that will lockout heat if there is a fan failure.

If the preceding conditions do not describe the behavior of the unit, the following checks should be performed:

• Verify that the voltage jumper on the motor plug harness is absent for 208-230V units and 277V units. If the jumper is present for these units, the motor

UV-SVN03F-EN

Diagnostics

electronics will be damaged, and the motor will not be controllable.

• Verify that the fan speed request is not below 450 rpm.

Speeds below 450 rpm are not supported on the fancoil product.

• Verify that the all binary inputs to the customer terminal blocks are of proper and consistent polarity.

– For CSTI units, the fan inputs and end device inputs on TB3 must receive signals that are 24 Vac with respect to the unit chassis.

Note: Do not short 24 Vac (pos 1 or pos 2) to chassis; refer to the unit schematic.

– For Fan Speed Switch units, that incorporate the

Tracer ZN/CSTI adapter board, all inputs to TB3 must be 24 Vac with respect to unit chassis.

Note: Do not short 24 Vac (pos 1 or pos 2) to chassis; refer to the unit schematic.

– For Tracer ZN units, where there is a desire to use parallel fan inputs on the adapter board TB3 strip, the inputs must be COM (i.e., the inputs will honor only 0 V with respect to unit chassis).

Note: Do not short 24 Vac (pos 1 or pos 2) to chassis; refer to the unit schematic.

• Verify that variable speed (VSP) inputs are properly wired to 1TB4.

Notes:

• Do not short the courtesy 10 Vdc supply to chassis or loads that require greater than 10 mA of DC current.

• Please observe proper polarity of 0–10 Vdc inputs.

Failure to observe proper polarity can cause failure of the ECM Engine board, the customer-supplied controller or the Tracer ZN controller.

• Verify that the signal on the VSP inputs is noise free.

The ECM engine board contains an adjustable noise floor parameter,



, that can be configured to reject signals below the noise floor.

Note: If the customer supplied controller outputs signals that are below the noise threshold, they will be ignored by the ECM engine.

• Verify that VSP input settings are correct. The ECM engine board contains an adjustable digital amplifier,



, to compensate for long 10 Vdc cable runs. For normalized (0–10 Vdc) signals, this setting should be set to 1.000. If it is set too high, the motors will faster than the requested ratio, and will hit the limit

 before the input voltage has reached its upper limit.

• Verify that



and



, the low motor signal output limits, are set correctly.

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Replacing ECM Components

WARNING

Hazardous Voltage w/Capacitors!

WARNING

Safety Alert!

You MUST follow all recommendations below. Failure to do so could result in death or serious injury.

• The adapter boards contain high voltage.

Configuration adjustments to the ECM engine board should be made through the SMALLER of the two low-voltage lids on the front of the control panel, through the low-voltage insulation/shielding.

• Initial hookups to the CSTI and standard adapter board, including low voltage interconnections, must be made with the power off.

• Do not make connections to the motors or the adapter boards while power is ON. Do not remove connections to the motor or the adapter boards while the power is ON.

• Caution should be taken to stay clear of hazardous voltages, moving parts and electric heat elements while making adjustments to the ECM engine board.

If it is not practical to stay clear of these areas during adjustment of the ECM engine board, please contact

Trane Global Parts for configuration kit that allows easy powering of the engine board outside of the unit with a 9V battery.

• For safe operation, it is necessary to configure replacement boards to match the setup/switch configuration of the previously installed boards.

• Ensure that new circuit modules are firmly seated on the nylon standoffs, and that the nylon standoffs are firmly seated on the metal panel.

108

NOTICE:

Equipment Damage!

The motor harness attached to the single plug to which the motor mates contains the very important 115V motor voltage jumper; the motor harness should always be present for 115V units and should not be modified or substituted. Failure to follow this instruction could result in equipment damage.

Notes:

• Ensure that drip-loops are maintained on wiring on pipe end of unit to avoid wicking of water into the unit.

• Before assuming that any of the boards or components in the new system have failed, please ensure that the

ECM engine board has been configured correctly and that the switches on the CSTI board (where applicable) are set correctly.

• It is necessary to configure the service replacement

ECM engine board before commissioning the unit. The

ECM engine board is pre-configured with safe values, but will NOT work correctly unless properly configured.

• Only genuine Trane ® replacement components with identical Trane part numbers should be used.

• Unit fan assemblies contain concealed wires that should be removed before the fan-board is removed, to avoid nicking the wire.

• Care should be maintained to retain the order of the motors with respect to the motor plugs. On a unit with two motors, the double-shafted motor will always be to the left side, and will be designated as Motor 2 by the controller.

Tips:

• Ensure that motor nameplate voltage is the same as unit voltage (for 3-phase/ 4-wire units with Neutral, motor voltage will be L-N, not L1-L2).

• Ensure that motor harness is correct (harness will have jumper installed for 115V units only).

• Ensure that configuration on ECM Engine matches the affixed label.

• Maintain correct plug/motor association. The plugs will have the motor number and shaft configuration printed on an affixed label.

• Ensure that configuration of switches on CSTI adapter board matches depiction of switches on the unit schematic.

• Ensure that all wires are plugged in securely.

• Ensure that edge protection on sharp edges, grommets, and wire management devices are maintained when replacing components.

• Ensure that blunt-tip screws are used when in the proximity of wire harnesses.

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Circuit Modules Replacement Notes/Work

Instructions

Circuit modules are equipped with nylon standoffs which can either be removed by squeezing the barbs at the rear of the control panel, or squeezing the latch above the circuit module. If the latter method is chosen, the standoffs will be retained on the metal panel. The new standoffs (affixed to the replacement modules) can be removed if necessary, so the new module circuit board can be attached to the retained standoffs.

Figure 67.

Replacing ECM Components

operation of the unit, discomfort to the end user, and loud fan operation.

5. Ensure that the CSTI adapter board switches are set correctly, as indicated on the attached unit schematic

(where applicable).

Figure 69.

Depress latch to remove PCB, leaving standoff attached to the metal panel.

2. If replacing the ECM engine module, special care should be taken to avoid electro-static discharge damage. Please use an ESD protection wrist-strap and frequently touch a grounded surface (with unit power off) to discharge any static buildup.

3. Replace connectors carefully onto the appropriate board. For units with a green wire attached to the CSTI or standard adapter boards, please ensure that the green wire is attached to the engine board white

connector as shown in Figure 68

Figure 68.

Green wire attached to white plug on blue ECM engine board, and to quick-connect terminal on the adapter board.

6. After replacing modules, commission the unit by performing at a minimum,

“Fan Speed Response

Verification,” p. 64 .

Softsetting the IMC Address of an ECM

Engine Module

When a blower coil, fan-coil, or unit ventilator application requires an ECM engine module, the Tracer UC400 requires that the ECM engine module be configured at IMC address 99. If an engine module is found at an address other than 99 (as it will be in a field application / hardware replacement scenario), Tracer TU populates the Expansion

Module box on the Controller Status screen as shown here.

4. Ensure that the new ECM engine controller is configured to match the ECM engine configuration label that is present on the unit. It is necessary to configure the ECM engine board to avoid improper

UV-SVN03F-EN 109

UV-SVN03_.book Page 110 Thursday, January 24, 2013 5:27 PM

Replacing ECM Components

Figure 70.

Notice one ECM type is configured at address 99, but no

ECM is found at that address. Also, notice that another

ECM has been found with an address of 0. When this situation occurs, Tracer TU displays a Softset… button you can use to configure the engine module address.

Complete the following steps to softset the engine module address:

Click the Softset… button to initiate the softest procedure.

Tracer TU displays the Softset Rotary Address -

Expansion Module dialog box.

Figure 71.

3. Once the light has been activated, click OK on the

Softset Rotary Address - Expansion Module dialog box shown in Step 2 .

When you click OK, Tracer TU softsets the engine module IMC address to 99 and the light on the module will turn off.

4. Return to the Expansion Module Status box, click

Discover and wait five to ten seconds for Tracer TU to refresh the screen.

Once complete, the value in the Error column updates to None and the Status column updates to Comm Up.

Figure 73.

2. Prior to clicking OK, activate the engine module using the (+) button on the ECM engine board in the control box.

Once the engine module is activated, the LED to the right of the (+) button lights up.

Figure 72.

110 UV-SVN03F-EN

UV-SVN03_.book Page 111 Thursday, January 24, 2013 5:27 PM

Trane optimizes the performance of homes and buildings around the world. A business of Ingersoll Rand, the leader in creating and sustaining safe, comfortable and energy efficient environments, Trane offers a broad portfolio of advanced controls and HVAC systems, comprehensive building services, and parts.

For more information, visit www.Trane.com.

Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice.

UV-SVN03F-EN 24 Jan 2013

Supersedes UV-SVN03E-EN (22 Feb 2011)

We are committed to using environmentally conscious print practices that reduce waste.

Installation, Operation, and Maintenance

Vertical Unit Ventilator

Classroom Unit Ventilator—Model VUV

UV-SVN03F-EN

Warnings, Cautions and Notices

Warnings, Cautions, and Notices.

Important

Environmental Concerns!

Responsible Refrigerant Practices!

Contains Refrigerant!

Proper Field Wiring and Grounding

Required!

Personal Protective Equipment (PPE)

Required!

Hazard of Explosion and Deadly Gases!

Introduction

Warnings, Cautions and Notices

Trademarks

Table of Contents

Vertical Unit

Ventilator Model

Number

Model Number Descriptions

Model Number Descriptions

General Information

Unit Description

Unit Nameplate.

Factory Shipment.

Access.

End Pockets.

Coil Connections.

Unit Drain Pan.

Motor.

Filters.

Sliding Fan Deck.

Outside-Air/Return-Air Dampers.

Options

Field-Installed Controls (Option).

Customer Supplied Terminal Interface (CSTI)

(Option).

Tracer ZN520 Control Package (Option).

Tracer UC400 Control Package (Option).

OA/RA Actuator (Option).

General Information

Face and Bypass Actuator (Option).

Modulating Water Valves (Option).

Isolation Valve (Option).

ECM Application Notes

RPM Mode

Field Power Wiring

Performance Boundaries

MCA/MFS and Power Draw

Electric Heat Relays

Troubleshooting Other Unit Functions

Dimensions and Weights

Unit Location and Clearances

Equipment Damage!

Electrocution and Fire Hazards with

Improperly Installed and Grounded Field

Wiring!

Dimensions and Weights

Dimensions and Weights

Dimensions and Weights

Dimensions and Weights

Dimensions and Weights

16 5/8" DEPTH UNIT

21 1/4" DEPTH UNIT

TOP VIEW

TOP VIEW

Dimensions and Weights

SIDE VIEW

SIDE VIEW

Receiving and Handling

Pre-Installation

Jobsite Inspection

Jobsite Storage

Microbial Growth!

Installation—Mechanical

Wall Box Installation

General Instructions.

**Field-Installed Controls (Option).**

**Tracer ZN520 Control Package (Option).**

**Trane Piping Packages (Option).**