Tracer

™

Controls

Tracer ZN511 and ZN521

Zone Controllers

January 2005

BAS-PRC006-EN

Introduction

The Tracer ZN511 and ZN521 zone controllers provide digital control for several types of heating, ventilating, and air-conditioning (HVAC) equipment.

The Tracer ZN511 controls:

• Water-source heat pumps

• Fan coils

• Cabinet heaters

The Tracer ZN521 controls:

• Unit ventilators

• Fan coils

• Cabinet heaters

• Blower coils

Tracer zone controllers operate as standalone devices or as part of a Trane

Integrated Comfort system (ICS). The controllers communicate with a Tracer

Summit building automation system via a LonTalk communication link. LonTalk allows the controllers to operate in peerto-peer configuration and to communicate with other compatible building control systems.

Trane offers a variety of wall-mounted zone sensors for Tracer controllers. Zone sensors come with any of the following options:

• Temperature setpoint thumbwheel

• Fan speed switch

•

ON

and

CANCEL

occupancy buttons

• A communications jack for the Rover service tool

™ ®

The following are trademarks or registered trademarks of their respective companies: Windows from Microsoft Corporation; LonTalk and LonMark from Echelon Corporation; Integrated Comfort, Rover, Tracer, and Tracer Summit from Trane.

BAS-PRC006-EN

BAS-PRC006-EN

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2

Tracer ZN511 zone controller. . . . . . . . . . . 4

Inputs and outputs . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Wiring diagram for the

ZN511 zone controller . . . . . . . . . . . . . . . . 5

Tracer ZN521 zone controller . . . . . . . . . . 6

Inputs and outputs . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Wiring diagram for the

ZN521 zone controller . . . . . . . . . . . . . . . . 8

Network architecture . . . . . . . . . . . . . . . . . 9

Zone sensor options . . . . . . . . . . . . . . . . 10

Dimensions and specifications . . . . . . . 11

3

Tracer ZN511 zone controller

4

The Tracer ZN511 zone controller provides digital control of fan coils and water-source heat pumps. The Tracer

ZN511 improves comfort control and provides stand-alone or networked building automation.

Inputs and outputs

Tracer ZN511 inputs and outputs include:

• Analog inputs: zone temperature, entering or leaving water temperature, discharge air temperature, zone temperature setpoint, fan mode switch

• Binary inputs: occupancy, condensate overflow, low water temperature, low pressure protection, high pressure protection

• Outputs: water-source heat pump: compressor 1, compressor 2, twoposition outside air damper, reversing valve, fan on/off

Fan coil: fan high, fan medium, fan low, 1 cool, 1 heat, two-position outside air damper

• Generic points for use with a Tracer

Summit building automation system: binary input (shared with occupancy), binary output (shared with outside air damper)

The generic inputs pass information to the building automation system. They do not affect the operation of the unit. The generic binary output is controlled by the building automation system and its state is not changed by unit operation, even under a diagnostic shutdown.

Features

Easy installation

The controller can be installed in existing

Trane and competitive HVAC equipment without major wiring changes, and clearly labeled screw terminals ensure that wires are connected quickly and accurately. A compact enclosure design simplifies installation in minimal space.

Entering water temperature sampling

A traditional system using a two-way control valve on a fan coil might not sense the correct entering water temperature during long periods when the control valve is closed. The Tracer

ZN511 solves this problem by opening the valve for three minutes to allow the water temperature to stabilize before the temperature is taken. This feature allows the use of two-way control valves to provide accurate two-pipe system changeover for 1heat/1 cool applications.

Automatic heat/cool mode determination

The Tracer ZN511 automatically determines whether heating or cooling is needed to maintain comfort levels, without the need to manually adjust unit controls. The controller measures the zone temperature and setpoint temperature, then uses a proportional/ integral algorithm to maintain zone temperature at the setpoint.

Occupied and unoccupied operation

The occupancy input works with a motion (occupancy) sensor or time clock. A communicated value from a building automation system through the

LonTalk communication link can also be used. The input allows the controllers to use unoccupied (setback) temperature setpoints.

Random start

This feature randomly staggers multipleunit start-up to reduce electrical demand spikes.

Warm-up and cool-down

This feature is available with the installation of an outside air damper. If the room temperature drifts too far from the setpoint, the controller temporarily closes the damper to bring the temperature to the desired setpoint as quickly as possible.

Manual output test

Pressing the test button on the controller exercises all binary outputs in sequence. This feature is an invaluable troubleshooting tool.

Peer-to-peer communication

Multiple controllers can share data if they are bound together. Shared data can include setpoint, zone temperature, mode, and fan status. Applications having more than one unit serving a single large space can benefit from this feature, which prevents multiple units from simultaneously heating and cooling.

Interoperability

The Tracer ZN511 conforms to the

LonMark

®

Space Comfort Controller

(SCC) profile and communicates via the

LonTalk protocol. This allows it to work with other control systems that support

LonTalk and the SCC profile.

Continuous fan or fan-cycling operation

Users can choose to have the fan run continuously at a given speed, or cycle on and off automatically by selecting the

AUTO

mode.

Equipment protection

The Tracer ZN511 includes inputs that allow for the following equipment protection:

• Refrigerant high- and low-pressure protection to prevent the unit from operating with high/low refrigeration pressure levels (heat pump only)

• Compressor minimum on and off timers to extend compressor life by preventing short cycling (heat pump only)

• A condensate overflow switch to prevent water damage to the building

• Low-temperature detection to prevent compressor operation during abnormal conditions (heat pump) or coil freeze-up (fan coil)

Timed override

The timed override function for after hours operation allows users to request unit operation by the touch of a button on the unit zone sensor. Additionally, users can press the

CANCEL

button at any time to place the unit back into unoccupied mode.

Fan status

The controller monitors the fan output status as proof of airflow. This method is cost effective and commonly used on direct-drive fan applications.

Filter maintenance

Filter maintenance status is based on the cumulative hours of operation of the unit fan. The controller has timers that can be reset, and when the time limit expires, Tracer Summit software or the

Rover service tool indicates that unit maintenance is recommended.

BAS-PRC006-EN

Wiring diagram for the

ZN511 zone controller

Figure 1 shows a general wiring diagram for the Tracer ZN511 zone controller.

Figure 1: Tracer ZN511 wiring diagram

H

24 Vac

N

Binary inputs Binary outputs

GND GND GND 24V

AC POWER

BI1 BI2 BI3

BINARY INPUTS

V4 BI4 V5 BI5 1 2 3 4 5

BINARY OUTPUTS

6 STATUS

LED

BAS-PRC006-EN

SERVICE

PIN LED ZN

ZONE SENSOR

GND SET FAN GND

ANALOG INPUTS

AI1 AI2

On

Cancel

5

6

Trane zone sensor

1

2

3

4

Analog inputs

Comm5 (LonTalk)

A

COMM5

B A B

COMM5

LED

Comm5 (LonTalk)

In

Out

5

Tracer ZN521 zone controller

6

The Tracer ZN521 zone controller provides digital control of fan coils, unit ventilators, and blower coils. The Tracer

ZN521 improves comfort control and provides stand-alone or networked building automation.

Inputs and outputs

Tracer ZN521 inputs and outputs include:

• Analog inputs: zone temperature, space setpoint, fan speed, entering water temperature, discharge air temperature, outside air temperature, zone relative humidity

• Binary inputs: occupancy, low coil temperature detection, fan status, condensate overflow detection

• Outputs: Fan high, fan medium, fan low, exhaust fan on/of, cooling valve, heating valve, face and bypass damper, economizer damper, electric heat (two stages)

• Generic points for use with a Tracer

Summit building automation system: binary input (shared with occupancy), binary output (shared with baseboard heat), two analog inputs (one shared with humidity sensor and often used with the optional carbon dioxide sensor, and the second shared with outdoor air temperature)

The generic inputs pass information to the building automation system. They do not affect the operation of the unit. The generic binary output is controlled by the building automation system and its state is not changed by unit operation, even under a diagnostic shutdown.

Features

Easy installation

The controller can be installed in existing

Trane and competitive HVAC equipment without major wiring changes, and clearly labeled screw terminals ensure that wires are connected quickly and accurately. A compact enclosure design simplifies installation in minimal space.

Modulating control

The Tracer ZN521 provides exceptional comfort control through hydronic valve and damper tri-state modulation and a proportional-integral control algorithm.

Cascade control

Cascade control differs from zone temperature control in that the unit resets the discharge air temperature to control the zone. Cascade control manages zone temperature more effectively than zone temperature control, in which the discharge air temperature can exceed comfort levels.

Entering water temperature sampling

Traditional equipment using a two-way control valve might not sense the correct entering water temperature during long periods when the control valve is closed. The Tracer ZN521 solves this problem by opening the valve for three minutes to allow the water temperature to stabilize before the temperature is taken. This feature allows the use of two-way control valves to provide accurate two-pipe system changeover for 1heat/1 cool applications.

Automatic heat/cool mode determination

The Tracer ZN521 automatically determines whether heating or cooling is needed to maintain comfort levels, without the need to manually adjust unit controls. The controller measures the zone temperature and setpoint temperature, then uses a proportional/ integral algorithm to maintain zone temperature at the setpoint.

Occupied and unoccupied operation

The occupancy input works with a motion (occupancy) sensor or time clock. A communicated value from a building automation system through the

LonTalk communication link can also be used. The input allows the controllers to use unoccupied (setback) temperature setpoints.

Random start

This feature randomly staggers multipleunit start-up to reduce electrical demand spikes.

Warm-up and cool-down

This feature is available with the installation of an outside air damper. If the room temperature drifts too far from the setpoint, the controller temporarily closes the damper to bring the temperature to the desired setpoint as quickly as possible.

Manual output test

Pressing the test button on the controller exercises all binary outputs in sequence. This feature is an invaluable troubleshooting tool.

Peer-to-peer communication

Multiple controllers can share data if they are bound together. Shared data can include setpoint, zone temperature, mode, and fan status. Applications having more than one unit serving a single large space can benefit from this feature, which prevents multiple units from simultaneously heating and cooling.

Interoperability

The Tracer ZN521 conforms to the

LonMark

®

Space Comfort Controller

(SCC) profile and communicates via the

LonTalk protocol. This allows it to work with other control systems that support

LonTalk and the SCC profile.

Equipment protection

The Tracer ZN521 includes inputs that allow for the following equipment protection:

• A condensate overflow switch to prevent water damage to the building

• Low-temperature detection to help prevent coil freeze-up

• Discharge air temperature limiting to help prevent the coil from freezing

Automatic fan speed reset

Units set to

AUTO

operate at the default fan speeds (cooling and heating may have different default speeds). If the default fan speed is high, medium, or low, the unit operates accordingly.

If the default fan speed is set to

AUTO

, the fan operates at low speed most of the time. If the temperature exceeds the setpoint by more than 2°F (1°C), the controller changes the fan speed to medium or high. This allows the unit to operate at low speed whenever possible.

BAS-PRC006-EN

Automatic ventilation reset

Because ensuring proper ventilation rates is so important for indoor air quality, the Tracer ZN521 is configured with two outside/fresh air damper minimum position setpoints for occupied operation. As the fan speed changes, the damper minimum position changes to maintain the correct ventilation rate.

Fan status

The Tracer ZN521 has two methods of monitoring fan status. The first method monitors the fan output status on the unit controller. This method is typically used with direct fan applications.

The controller can also accept a binary input from a fan proof switch for belt driven applications. When fan operation is expected by the controller but not confirmed by the proof switch, a diagnostic message is generated and unit operation is disabled.

Filter maintenance

Filter maintenance status is based on the cumulative hours of operation of the unit fan. The controller has timers that can be reset, and when the time limit expires, Tracer Summit software or the

Rover service tool indicates that unit maintenance is recommended.

Water valve override

This function causes all of the water valves in every unit to open simultaneously at a command from

Tracer Summit software or the Rover service tool. This function reduces the time required for balancing the water distribution system.

Relative humidity input

An analog input can be configured as a relative humidity input. The controller can use this value to support the dehumidification function.

Active dehumidification

This feature keeps relative humidity levels within ASHRAE 62-89R guidelines to maximize comfort and minimize the risk of microbial growth and damage to the building or furnishings due to humidity. The controller can provide active dehumidification when the equipment includes a reheat coil and a humidity sensor.

CO

2

input

An analog input can be configured to measure CO

2

. Tracer Summit can use the input in a variety of applications. This input has no direct effect on the operation of the controller.

Two-stage electric heat

The Tracer ZN521 supports 1- or 2-stage electric heat operation for heating. To control the zone temperature, electric heat is cycled to control the discharge air temperature. The rate of cycling is dependent on the load in the space and the temperature of any incoming fresh air from the economizer.

Two-pipe changeover units with electric heat use electric heat when hot water is not available.

Economizing control

When the Tracer ZN521 is configured for economizing control, it opens the outdoor damper to the calculated position to provide “free” cooling as required. If the damper is completely open and the setpoint is still not achieved, the cooling valve opens to satisfy load requirements. As cooling load requirements decrease, the valve closes until the setpoint is reached or the damper reaches its adjustable minimum position.

BAS-PRC006-EN 7

Wiring diagram for the

ZN521 zone controller

Figure 2 shows a general wiring diagram for the Tracer ZN521 zone controller.

Figure 2: Tracer ZN521 wiring diagram

H

24 Vac

N

Binary inputs Binary outputs

GND

24V 24V 24V

AC POWER

BI1 BI2 BI3

BINARY INPUTS

BI4 1 2 3 4 5 6 7

BINARY OUTPUTS

8 9 10 STATUS

LED

8

SERVICE

PIN LED

ZONE SENSOR

ZN GND SET FAN GND AI1

ANALOG INPUTS

AI2 AI3 +20 AI4 GND A

COMM5

B A B

On

Cancel

1

2

3

4

5

6

Trane zone sensor

Comm5 (LonTalk)

Analog inputs

Comm5 (LonTalk)

In

Out

BAS-PRC006-EN

Network architecture

Tracer zone controllers, shown in

Figure 3, can operate on a Tracer

Summit building automation system, on a peer-to-peer network, or as standalone devices.

Figure 3: Tracer zone controllers network architecture

Tracer zone controllers as part of a building automation system

Tracer Summit

PC workstation

The Rover service tool can configure the controllers through the communication jack in a zone sensor or at any accessible location on the LonTalk communication link.

LAN (Ethernet or ARCNET)

Building control unit

(BCU)

LonTalk link

Tracer loop controller

Zone sensor

ZN511

ZN511

Water-source heat pump

Tracer zone controllers on a peer-to-peer network

ZN511

Fan coil

One zone sensor for multiple fan coils

ZN511

ZN521

Rover service tool

Unit ventilator

BAS-PRC006-EN 9

Zone sensor options

Zone sensors are available in a variety of configurations. Table 1 describes Trane zone sensors available for Tracer zone controllers. Figure 4 shows three types of zone sensors for the Tracer ZN511 and ZN521 zone controllers.

Table 1: Trane zone sensor options

BAS order number

4190 1087

4190 1088

4190 1090

4190 1094

4190 1095

4190 1115

4190 1116

4190 1117

Use

Any

Any

Heat pump

Heat pump

Unit vent

Fan coil

Unit vent

Any

Fan Zone

High Med Low Auto x x x x x x x x x x x x x x

Off

Setpoint thumbwheel

Temperature sensor x x x x x x x x x x x x x x

Figure 4: Zone sensors compatible with Tracer zone controllers

x x x x

Timed override buttons

On Cancel x x x x x x x x

Comm jack x x x x x x x

10 BAS-PRC006-EN

Dimensions and specifications

Dimensions

Plastic-cover model dimensions

(See Figure 5)

Height: 5.375 in. (137 mm)

Width: 6.875 in. (175 mm)

Depth: 2.0 in. (51 mm)

Metal-cover model dimensions

(see Figure 6)

Height: 9.0 in. (25 mm)

Width: 10.37 in. (263 mm)

Depth: 2.25 in. (58 mm)

Power

Supply: 19–30 Vac (24 Vac nominal) at

50/60 Hz

Consumption: 14 VA plus 12 VA

(maximum) per binary output

Operating environment

Temperature:

From 32 to 140°F (0 to 60°C)

Relative humidity:

From 5 to 95% noncondensing

Storage environment

Temperature:

From –40 to 185°F (–40 to 85°C)

Relative humidity:

From 5 to 95% noncondensing

Agency listings/compliance

CE—Immunity:

EN 50082-1:1997

EN 50082-2:1995

CE—Emissions:

EN 50081-1:1992 (CISPR 22)

UL and C-UL listed:

Energy management system

UL 94-5V (UL flammability rating for plenum use)

FCC Part 15, Class A

LonMark

®

Space Comfort Controller

(SCC) profile

Figure 5: Tracer ZN511 and ZN521 plastic-cover model dimensions

6.3 in

(160 mm)

5.625 in.

(143 mm)

2.0 in.

(51 mm)

5.375 in.

(137 mm)

6.875 in.

(175 mm)

Figure 6: Tracer ZN511 and ZN521 metal-cover model dimensions

1.875 in.

(48 mm)

6.5 in.

(165 mm)

9.0 in.

(229mm)

7.0 in.

(178 mm)

10.37 in.

(263 mm) with cover

BAS-PRC006-EN

2.25 in.

(58 mm)

1.0 in.

(25 mm)

10.25 in.

(260 mm) without cover

0.28 in.

(7 mm)

9.0 in.

(229 mm)

11

Literature Order Number BAS-PRC006-EN

File Number

Supersedes

PL-ES-BAS-000-PRC006-0105

February 2002

The Trane Company

An American Standard Company www.trane.com

For more information contact your local district office or e-mail us at [email protected]

Since The Trane Company has a policy of continuous product and product data improvement, it reserves the right to change design and specifications without notice.