AAON SS1016 VCM Controller Technical Guide

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FACTORY CONTROLS SYSTEM

VCM - Controller

Technical Guide

VCM Controller Code: SS1016

Requires System Manager Code: SS1010 Version 3.0 and up

Requires Service Tool Code: SS1009 Version 3.0 and up

Table Of Contents

Controller Overview ........................................................................................................................................ 4

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

Applications ................................................................................................................................................................................ 4

Controller Installation & Wiring ...................................................................................................................... 8

General ..................................................................................................................................................................................... 10

Controller Mounting .................................................................................................................................................................. 10

Important Wiring Considerations .............................................................................................................................................. 10

Expansion Board Installation & Wiring ........................................................................................................ 11

Jumper Settings ......................................................................................................................................................................... 11

Wiring Considerations .............................................................................................................................................................. 12

Input/Output Wiring Details........................................................................................................................... 14

Space Temperature Sensor ...................................................................................................................................................... 14

Remote SAT Reset Signal ........................................................................................................................................................ 14

Supply & Return Temperature Sensor ...................................................................................................................................... 15

Outdoor Air Temperature Sensor .............................................................................................................................................. 17

Economizer Damper Actuator ................................................................................................................................................... 18

Suction Pressure Transducer ................................................................................................................................................... 19

Supply Fan VFD Signal Or Zoning Bypass Damper Actuator .................................................................................................. 21

Binary Inputs Wiring ................................................................................................................................................................. 22

Outdoor Air Humidity Sensor .................................................................................................................................................... 23

Indoor Wall Mounted Humidity Sensor ..................................................................................................................................... 24

Return Air Mounted Humidity Sensor ....................................................................................................................................... 25

Building Pressure Sensor Wiring .............................................................................................................................................. 26

Building Pressure Control

Output Wiring ............................................................................................................................................................................ 27

CO2 Sensor Wiring ................................................................................................................................................................... 28

Modulating Heating Device Wiring ........................................................................................................................................... 29

Modulating Cooling Device Wiring ........................................................................................................................................... 30

Return Air Bypass Wiring .......................................................................................................................................................... 31

Start-up & Commissioning ............................................................................................................................ 32

Controller Addressing ............................................................................................................................................................... 32

Power Wiring ............................................................................................................................................................................ 32

Initialization: .............................................................................................................................................................................. 33

Operating Summary .................................................................................................................................................................. 33

Programming The Controller .................................................................................................................................................... 33

Inputs & Outputs ........................................................................................................................................... 34

VCM Controller ......................................................................................................................................................................... 34

OE354 (4) Analog Input

(1) Analog Output Expansion Board ......................................................................................................................................... 35

OE355 (4) Analog Output

Expansion Board ...................................................................................................................................................................... 35

OE357 (4) Relay Expansion Boards ......................................................................................................................................... 35

OE356 Binary Expansion Board #1 .......................................................................................................................................... 36

OE356 Binary Expansion Board #2 .......................................................................................................................................... 36

FACTORY CONTROLS SYSTEM

WattMaster Controls Inc.

8500 NW River Park Drive · Parkville , MO 64152

Toll Free Phone: 866-918-1100

PH: (816) 505-1100 · FAX: (816) 505-1101 · E-mail: [email protected]

Visit our web site at www.orioncontrols.com

AAON

is a registered trademark of AAON, Inc., Tulsa, OK.

WattMaster Controls, Inc. assumes no responsibility for errors, or omissions.

This document is subject to change without notice.

Technical Guide

Sequence Of Operations ............................................................................................................................... 37

Occupied/Unoccupied

Mode of Operation .................................................................................................................................................................... 37

HVAC Modes of Operation ....................................................................................................................................................... 37

Vent Mode Operation ................................................................................................................................................................ 37

Cooling Mode Operation ........................................................................................................................................................... 37

Dehumidification Mode ............................................................................................................................................................. 39

Remote Forced Dehumidification ............................................................................................................................................. 40

Return Air Bypass Damper Control .......................................................................................................................................... 40

Heating Mode Operation .......................................................................................................................................................... 40

Warm-up Mode Operation ........................................................................................................................................................ 42

Off Mode ................................................................................................................................................................................... 42

Remote Control of HVAC Mode ................................................................................................................................................ 42

Supply Air Temperature

Setpoint Reset .......................................................................................................................................................................... 42

Supply Fan Control ................................................................................................................................................................... 43

Duct Static Pressure Control .................................................................................................................................................... 43

Building Pressure Control ......................................................................................................................................................... 43

IAQ (CO2) Operation ................................................................................................................................................................ 44

Pre-heater Operation ................................................................................................................................................................ 44

Outdoor Air Lockouts ................................................................................................................................................................ 44

Supply Air Cutoffs ..................................................................................................................................................................... 44

Scheduling ................................................................................................................................................................................ 44

Internal Trend Logging .............................................................................................................................................................. 45

Force Modes or Overrides ........................................................................................................................................................ 45

VAV/Zone Box Compatibility ..................................................................................................................................................... 46

VAV/Zone System ..................................................................................................................................................................... 46

Zoning System .......................................................................................................................................................................... 46

Troubleshooting ............................................................................................................................................ 47

Using LEDs To Verify Operation ............................................................................................................................................... 47

Appendix ........................................................................................................................................................ 48

Diagnostic LEDs Operation ...................................................................................................................................................... 48

System Configuration Options .................................................................................................................................................. 49

10 kOhm Type III Temperature Sensor Testing ........................................................................................................................ 53

OE265 RH Sensor Testing ....................................................................................................................................................... 54

OE271 Pressure Sensor Testing .............................................................................................................................................. 55

OE258 Pressure Sensor Testing .............................................................................................................................................. 55

OE275 Suction Pressure Transducer Testing ........................................................................................................................... 56

Notes: ............................................................................................................................................................ 57

VCM Controller

3

Technical Guide

Controller Overview

Features

The VCM Controller Board is designed with 7 analog inputs, 2 analog outputs and 5 relay outputs. The controllers input and output capabilities can be expanded by use of either 2 slot or 4 slot expansion boards that plug into the VCM Controller by means of a modular cable. The

VCM Controller can be configured for control of VAV Units (with or without VAV/Zone Controllers), Constant Volume Units and Make-up

Air Units. Features include the following:

•

Up to a Combined Total of 20 Stages of Heating & Cooling

•

Modulating Cooling Output (Digital Compressor or Chilled

Water Valve Control)

•

Modulating Heating Output (Hot Water Valve, Steam Valve,

SCR Electric Heat Control)

•

Full Integration with the AAON

MODGAS II Modulating Natural Gas Controller

•

Full Integration with the AAON

MHGRV II Modulating

Hot Gas Reheat Controller

•

Configurable for Air to Air Heat Pump Applications

•

Advanced Dehumidification Capabilities

•

Primary/Secondary Heating Control

•

Automatic Supply Air Reset

•

Selectable Control Sensor

•

Fan Proving Interlock

•

Dirty Filter Alarm

•

Smoke Detector Input

•

Drybulb/Wetbulb Control of Economizer Operation

•

Building Pressure Control

•

Remote Override Capabilities

•

I.A.Q. Economizer Reset

•

7 Day, 2 Event per Day Scheduling

•

14 Holiday Event Scheduling

•

Optimal Start Scheduling

•

Trend Logging Capability

•

Static Pressure Control For Filter Loading Applications

•

Accepts Remote HVAC Mode Selection Via Contact

Closure On Expansion Input Board

•

Configurable for PAC and DPAC Applications

Most common HVAC unit control applications can be configured using only the VCM Controller board. If the application requires more inputs and/or outputs, optional expansion boards are available to provide for additional analog, binary or digital inputs and outputs as required. These expansion boards are installed on either a 2 slot or 4 slot expansion base board that connects to the VCM Controller board via a modular cable connection.

The available expansion board configurations allow for (8) additional binary inputs, 4 additional analog inputs, 1 additional analog output, and up to 16 additional binary (relay) outputs. The various expansion boards connect to the 2 slot or 4 slot expansion base boards. Jumpers located on the base boards near each expansion board socket must be set according to the board type installed on that socket.

Applications

Variable Air Volume Unit

The VCM can be configured to control a VFD Supply Fan for Duct

Static Pressure control. If the unit is not equipped with a VFD, but Duct

Static Pressure control is needed, a modulating Zoning Bypass Damper can be controlled by the VCM.

VAV units are typically designed for occupied Cooling with Morning

Warm-up Heating. This option is available with the VCM. The VCM can also be used for a Zoning System that needs Duct Static Pressure control and Occupied Cooling and Heating. The VCM also has the ability to be configured for Duct Static Pressure Control by controlling the

Supply Fan VFD for the purpose of maintaining proper Duct Static

Pressure in response to varying filter loading conditions.

The VCM allows Dehumidification Priority on a VAV unit. This could be useful on a building with very low internal sensible load, but has a high internal and/or external latent load. During VAV Dehumidification the VCM activates Cooling based on the Evaporator Coil Temperature and activates Modulating Hot Gas Reheat to warm the Supply Air Temperature to the Active Supply Air Temperature Setpoint.

Constant Air Volume Unit

The VCM can be configured to activate a Constant Volume Supply

Fan. In most cases, this is a very basic unit with Space Temperature control. The VCM can be used for kitchen, restaurant or lab environments that are 100% Outdoor Air part of the time and return air part of the time. The Hood On input allows the VCM to know when to switch to 100% Outdoor Air control based on an exhaust hood activating. The

VCM requires Outdoor and Indoor Air Temperature Sensors to accomplish this application.

Make-up Air Unit

The VCM can be configured for 100% Outdoor Air control for Makeup Air. All HVAC Modes are determined from the Outdoor Air Sensors.

The Outdoor Air Volume must always be at least 50% or higher to be configured for Outdoor Air control.

4

VCM Controller

Technical Guide

Air to Air Heat Pump Unit

The VCM can be configured to control an Air to Air Heat Pump. The compressors are used for both Heating and Cooling. With the VCM controller the Reversing Valve is activated during Heating operation as the default because AAON units are typically built to fail to Cooling operation. The Reversing Valve can be configured to activate during

Cooling operation for equipment that is built to fail to Heating operation.

Auxiliary Heating Stages are configured as Heat Relays and are used to supplement the Compressor Heating Stages. If the unit is not equipped with Auxiliary Heating Stages, Heating Relays do not need to be configured in order for the unit to provide Heating. Auxiliary Heating can also be Modulating heat in the form of SCR Electric, Hot Water or

Steam.

For PAC configured units, the Return Air Bypass Damper is only used during the Dehumidification Mode. When the VCM controller is in Dehumidification Mode, the Return Air Bypass Damper will modulate open as the Space Temperature falls below the Cooling Setpoint. Modulation of the Return Air Bypass Damper is controlled using a proportional range from 0% (when the Space Temperature is equal to the Cooling Setpoint), up to 100% (when the Space Temperature falls to the halfway point between the Cooling and Heating Setpoints). A separate,

Return Air Damper Actuator will modulate the Return Air Damper slightly further towards its closed position as the Return Air Bypass

Damper opens. This is to ensure that enough Return Air is bypassed around the Evaporator Coil through the Return Air Bypass Damper to raise its temperature. The rate which the Return Air Damper closes while the Return Air Bypass Damper is open is user adjustable.

DPAC – Digital Precision Air Control

This control scheme can only be used on Constant Volume HVAC units that are equipped with a Return Air Bypass Damper, a Digital Compressor and use a Space Temperature Sensor as the Controlling Sensor.

The Cooling and Dehumidification Modes operate in the same manner as described under the Cooling and Dehumidification titled sections of this manual. In the Heating Mode, the VCM activates the Reversing

Valve and stages compressors to provide Heating if the Outdoor Air

Temperature is above the OAT Cooling Lockout Setpoint. The compressor heating stages are activated as needed to achieve the Active

Supply Air Setpoint. Staged or Modulating Auxiliary Heat can be activated to supplement Compressor Heating in order to achieve the Active

Supply Air Setpoint if the Outdoor Air Temperature is below the OAT

Heating Lockout Setpoint. If the Outdoor Air Temperature is below the

OAT Cooling Lockout Setpoint, only Auxiliary Heating will occur. If the Outdoor Air Temperature is above the OAT Heating Lockout, only

Compressor Heating will occur.

PAC (Precision Air Control)

This control scheme can only be used on Constant Volume HVAC units that are equipped with a Return Air Bypass Damper and use a

Space Temperature Sensor as the Controlling Sensor.

The DPAC control scheme provides improved moisture removal capabilities over the PAC control scheme and provides for tighter temperature control by combining a Digital Compressor with the Return Air

Bypass Damper. See the Cooling Mode section of this manual for detailed Digital Compressor operation. See the PAC Control previously described in this section for detailed Return Air Bypass Damper operation.

The Digital Compressor is used during both Cooling and Dehumidification Modes. The Return Air Bypass Damper is used only during the

Dehumidification Mode.

PAC Control provides improved moisture removal capabilities while utilizing internal space loads for reheat by redirecting the Return Air path from the upstream side of the DX Evaporator Coil to the downstream side of the coil.

VCM Controller

5

Technical Guide

Controller Overview

.20 Dia.

Typ. of 4

7.3”

6.2“

RN1

CX1

CX2

TB1

COMM

SHLD

CX5

LD6

TB3

COMM

LD7

PWR

+VDC

AIN1

AIN2

AIN3

AIN4

RN5

RS-485

COMM

AIN5

GND

C10

GND

AOUT1

C12

AOUT2

AIN7

GND

PJ1

C17

D15

U13

RAM

CX13

U15

R15

C14

R19

U14

U12

CX14

C15

R22

R24

R25

EPROM

TUC-5R PLUS

(1 MEG)

YS101816 REV. 2

LD8

LED1

RV1

VREF ADJ

LD9

LED2

+VREF

5.11V

TEST POINT

EWDOG

R28

INPUTS

PU1

PU2

PU3

PU4

PU5

D11

PU7

D14

ADDRESS

SW1

ADD

TOKEN

NETWORK

U10

JP1

CX10

CX6

CX12

C20

CX15

CX4

PAL

D12

R13

SC1

D19

PRESSURE

SENSOR

R26

EXPANSION T'STAT

VR1

VR2

6.7”

COM1-3

COM4-5

TB2

C13

C16

TB4

GND

24VAC

Figure 1: VCM Controller Dimensions

6.6”

6

VCM Controller

Technical Guide

4.00

2.12

4.24

0.28

R14

PWR LD1

R20

PWR LD1

4.73

LM358N

I/O

YS101780

TMODULAR LO 2S

5.40

5.96

9.52

LM358N

R13

R14

P82B715P

8.29

8.96

4.00

OE352 2 Slot Expansion Base Board

R10

R11

R12

0.28

2.12

4.24

OE353 4 Slot Expansion Base Board

Figure 2: Expansion Base Boards Dimensions

1.67”

TB1

P2506-2 P2506-2 P2506-2

4.00”

CX2

PCF8591P

OE354

4 Analog Input 1 Analog

Output Expansion Board

4.24”

4.00”

C4 C3

LM358 LM358

C1 C2

TDA8444P

PHILIPS

AN ID ID

RV1

OE355

4 Analog Output

Expansion Board

4.24”

4.00”

PCF8574P

74HC14N

OE356

4 Binary Input

Expansion Board

4.24”

4.00”

U3 CX2

CX1

OE357

4 Relay Output

Expansion Board

4.24”

Figure 3: Expansion Boards Dimensions

VCM Controller

7

Technical Guide

Controller Installation & Wiring

RS-485

Communications

Loop Connection

RS-485

Communications

Driver Chip

Comm

LED

Power

LED

Diagnostic

Blink Code

LEDs

Pull-up Resistors

For Analog Inputs

Analog Input

And Output

Modular Service

Tool - Mini Din

Connector

Terminal Block

Duct Static Pressure Sensor

(AIN6 Modular Connection)

Typical

Pin 1

Indicator

RAM

Chip

EPROM

Chip

CX1

RN1 U2

CX2

CX4

TB1

COMM

SHLD

CX5

LD6

COMM

LD7

PWR

RS-485

COMM

LD8

LED1

RV1

VREF ADJ

LD9

LED2

+VREF

5.11V

TEST POINT

EWDOG

R28

INPUTS

ADDRESS

TB3

+VDC

RN5

AIN1

AIN2

AIN3

AIN4

AIN5

GND

C10

GND

AOUT1

C12

AOUT2

AIN7

GND

PJ1

C17

D15

PU1

PU2

PU3

PU4

PU5

D11

PU7

D14

U13

SW1

CX13

U15

C20

RAM

CX15

C15

R22

R24

R25

EPROM

TUC-5R PLUS

(1 MEG)

YS101816 REV. 2

ADD

TOKEN

NETWORK

U10

JP1

CX10

R15

C14

R19

U14

U12

CX14

CX6

CX12

PAL

D12

R13

SC1

D19

R26

PRESSURE

SENSOR

EXPANSION

T'STAT

VR1

VR2

PAL

Chip

COM1-3

COM4-5

TB2

C13

C16

TB4

GND

24VAC

Expansion Board

(Modular Connection)

Real Time

Clock Chip

DigiSensor

(Modular Connection)

Mounting Hole

Typ of 4

Mounting

Backplate

Relay Output

Terminal Block

Address Switch

EEPROM

24 VAC

Power Input

Figure 4: VCM Controller Component Locations

8

VCM Controller

Technical Guide

RLY1

CX3

RLY2

RLY3

RN2

RLY4

RLY5

RN4

CX8

NE5090NPB3192 0PS

D10

R10

D13

R11

C11

U11

PHILIPS

VDC

0-5

0-1

VDC

RN3

C21

D17

D18

C18

C19

R27

D16

POWER

PJ2

PJ3

VCM Controller

9

Technical Guide

Controller Installation & Wiring

General

Correct wiring of the VCM controller is the most important factor in the overall success of the controller installation process. In general most

VCM controllers are factory installed and wired at the AAON

® factory.

It is also possible to purchase these controllers directly from WattMaster

Controls for installation in the field. Some of the following information pertains to field wiring and may not apply to your installation since it was pre-wired at the factory. However, in the unlikely event that troubleshooting of the controller is required, it is a good idea to be familiar with the system wiring, no matter if it was factory or field wired.

Controller Mounting

When the controller is to be field mounted, it is important to mount the controller in a location that is free from extreme high or low temperatures, moisture dust and dirt. See Table 1 for a list of the required operating conditions for the VCM Controller and associated expansion boards.

Warning: When using a single transformer to power more than one controller or expansion board, the correct polarity must always be maintained between the boards. Failure to observe correct polarity will result in damage to the VCM controller and expansion boards.

Please carefully read and apply the following information when wiring the VCM controller or the VCM Expansion Boards. See Figure 5 for

VCM controller wiring diagram. See Figures 6, 7 and 8 for Expansion

Board Wiring.

All wiring is to be in accordance with local and national electrical codes and specifications.

Minimum wire size for 24 VAC wiring should be 18 gauge.

Minimum wire size for all sensors should be 24 gauge.

Some sensors require 2 conductor wire and some require 3 or 4 conductor wire.

Be careful not to damage the electronic components when mounting the controller. Remove the controller from its backplate. Mark the control enclosure base using the backplate as a template. Drill pilot holes in the enclosure base and secure the backplate to it using sheet metal screws.

Do not allow metal shavings to fall onto the circuit board. Reattach the controller to the backplate.

Important Wiring Considerations

The VCM controller and expansion boards must be connected to a 24

VAC power source of the proper size for the calculated VA load requirements. All transformer sizing should be based on the VA rating listed in Table 1.

Be sure that all wiring connections are properly inserted and tightened into the terminal blocks. Do not allow wire strands to stick out and touch adjoining terminals which could potentially cause a short circuit.

Control

Device

When communication wiring is to be used to interconnect

VCM controllers together or to connect to other communication devices, all wiring must be plenum rated, minimum 18 gauge, 2 conductor, twisted pair with shield.

WattMaster can supply communication wire that meets this specification and is color coded for the network or local loop. Please consult your WattMaster distributor for information. If desired, Belden #82760 or equivalent wire may also be used.

VCM Controller

Board

2 Slot Expansion

Base Board

4 Slot Expansion

Base Board

24VAC

60Hz

24VAC

60Hz

24VAC

60Hz

F to 149

90% RH

*N.C.

F to 149

90% RH

*N.C.

F to 149

90% RH

*N.C.

Before applying power to the VCM controller, be sure to recheck all wiring connections and terminations

thoroughly.

* Non-Condensing

Table 1: Voltage and Environment Requirements

10

VCM Controller

Technical Guide

Expansion Board Installation & Wiring

Jumper Settings

OE354 4 Analog Input 1 Analog Output Expansion Board

(1 per VCM Controller)

Several different Expansion Boards are available for use with the VCM

Controller to provide additional inputs and outputs beyond those found on the VCM Controller board. These Expansion Boards are mounted to either the OE352, 2 slot Expansion Base Board(s) or the OE353, 4 slot

Expansion Base Board(s) depending on the total number of expansion boards to be used with your particular application.

OE355 4 Analog Output Expansion Board

(1 per VCM Controller)

OE356 4 Binary Input Expansion Board

(Up to 2 boards per VCM Controller)

OE357 4 Relay Output Expansion Board

(Up to 4 boards per VCM Controller)

The OE352 2 Slot Expansion Base board or the OE353 4 Slot Expansion Base boards are connected to the VCM Controller and to each other with modular cables. A maximum of (2) Expansion Base Boards total, (4 slot, 2 slot or a combination of both) can be connected to the

VCM controller.

The VCM controller uses the following expansion boards. The maximum quantities of each expansion board that can be used for each VCM controller are also listed.

The various Expansion Boards can be mounted on the Expansion Base

Board in any order, however, the address jumpers located near each

Expansion Board plug-in socket must be set correctly for the Expansion Board that is connected to that socket. In addition the OE354, 4

Analog Input 1 Analog Output Expansion Board also has Voltage Jumpers (J01, J02, J03 & J04) and Pullup Resistors (PU1, PU2, PU3, &

PU4) that must be correctly configured for proper Expansion Board operation. See Figure 6 for the correct address jumper, voltage jumper and Pullup resistor settings for the VCM application.

OPTO1

BIN 1

BIN 2

BIN 3

OPTO2

BIN 4

R10

COM

R12

4 DIG. IN MOD. I/O BD.

YS101788

CX2

CX1

OE356 4 Binary Input Expansion Board #1

Address Jumpers

Jumpers

Under

Expansion

Board To Be

Set As Shown

For Proper Operation Pullup Resitors PU1, PU2,

PU3 & PU4 Must Be Removed As Shown

AIN1

AIN2

AIN3

AIN4

GND

AOUT1

R10

PU1

PU2

PU3

PU4

LM358

JO1

JO2

JO3

JO4

Jumper Must Be Off For AIN1, 2 & 4

Jumper Must Be ON For AIN3

Jumper On = 0-10VDC Input Setting

Jumper Off = 0-5 VDC Input Setting

CX1

T L

PHILIPS

I D

4 ANALOG IN MOD. I/O BD.

YS101784

Address Jumpers

Jumpers

Under

Expansion

Board To Be

Set As Shown

OE354 4 Analog Input - 1 Analog Output Expansion Board

OPTO1

BIN 1

BIN 2

BIN 3

BIN 4

COM

R10

OPTO2

R12

4 DIG. IN MOD. I/O BD.

YS101788

CX2

CX1

Address Jumpers

OE356 4 Binary Input Expansion Board #2

Jumpers

Under

Expansion

Board To Be

Set As Shown

CX2

AOUT1

AOUT2

AOUT3

AOUT4

GND

CX3

CX1

4 AOUT MOD. I/O BD.

YS101786

OE355 4 Analog Output Expansion Board

Address Jumpers

Jumpers

Under

Expansion

Board To Be

Set As Shown

-PS

UL5A250V

CONTACT

24VDC

G5L-114P

OMRON

-PS

24VDC

UL5A250V

CONTACT

G5L-114P

OMRON

ULN2803A/

PHILIPS T L

K2 74HC04N

-PS

24VDC

CONTACT

OMRON

G5L-114P

UL5A250V AC

-PS

24VDC

CONTACT

OMRON

G5L-114P

UL5A250V

RN1

PCF8574P

4RLY IO BD.

YS101790

Address Jumpers

Relays 6-9 Relays 10-13

Relays 14-17 Relays 18-21

Jumpers

Under

Expansion

Board To Be

Set As Shown

OE357 4 Relay Output Expansion Board

Figure 6: Expansion Board Jumper and Pullup Resistor Settings

VCM Controller

11

Technical Guide

Expansion Board Installation & Wiring

Wiring Considerations

The expansion base boards must be connected to 24 VAC as shown in the wiring diagram below. Please see Table #1 for correct VA requirements to use when sizing the transformer(s) used for powering the expansion base boards.

Also please note that when wiring the OE356 - 4 Binary Input Expansion Board(s), its contacts must be wired as wet contacts (connected to

24 VAC) not dry contacts as used with the OE357 - 4 Relay Expansion

Boards . See Figures 7 and 8 for complete wiring details.

WARNING!!

Observe Polarity! All boards must be wired with GND-to-GND and 24VAC-to-24VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion Boards must be wired in such a way that power to both the expansion boards and the controller are always powered together. Loss of power to the expansion board will cause the controller to become inoperative until power is restored to the expansion board.

10 VA Minimum Power Required For

Each OE352 - 2 Slot Expansion Base Board.

20 VA Minimum Power Required For

Each OE353 - 4 Slot Expansion Base Board

Modular Cable

Connect To VCM Controller

Modular Cable

Connect To Next Expansion Board

(When Used)

Building Pressure

Relief FAN VFD

COM

Orion - OE258 Building Pressure

Transducer

EXC

OUT

COM

Hood On - N.O. Contact

Dirty Filter - N.O. Contact

Proof Of Flow - N.O. Contact

Remote Forced Occupied - N.O. Contact

BIN1

BIN2

BIN3

BIN4

COM

Plastic Tubing To Building

Pressure Sensing Locations

Orion - OE255 Room Mounted CO2 Sensor

Orion - OE256 Return Air Mounted CO2 Sensor

AC+/DC+

AC/GND

0-10V OUTPUT

SIGNAL GROUND

Orion - OE265-13 Outdoor Air

Humidity Sensor

VAC OR DC

GND

0-5V

Orion OE265-11 Indoor Air

Humidity Sensor

VIN

GND

VOUT (0-5V)

Modulating Heating

(0 to 10 VDC Input)

COM

Modulating Cooling

Or Digital Scroll Compressor

(1.5 to 5, 0 to 10 or 2 to 10 VDC Input)

COM

When Copeland Scroll Compressor Is

Used Wire Per Copeland Digital Scroll

Wiring Detail

Return Air

Damper Actuator

(0-10 VDC)

Remote Forced Heating - N.O. Contact

Remote Forced Cooling - N.O. Contact

Smoke Detector - N.C. Contact

Remote Forced Dehumidification

N.O. Contact

BIN1

BIN2

BIN3

BIN4

COM

COM 1

+ 2

Y1 3

AIN1

AIN2

AIN3

AIN4

GND

AOUT1

AOUT2

AOUT3

AOUT4

GND

R20

PWR LD1

OPTO1

BIN 1

BIN 2

BIN 3

BIN 4

COM

R10

OPTO2

R12

4 DIG. IN MOD. I/O BD.

YS101788

OPTO1

BIN 1

BIN 2

BIN 3

OPTO2

BIN 4

R10

COM

AIN1

AIN2

AIN3

AIN4

GND

AOUT1

R12

4 DIG. IN MOD. I/O BD.

YS101788

PU1

PU2

PU3

PU4

LM358

R10

JO1

JO2

JO3

JO4

AOUT1

AOUT2

AOUT3

AOUT4

GND

4 AOUT MOD. I/O BD.

YS101786

CX3

CX2

CX1

4 ANALOG IN MOD. I/O BD.

YS101784

CX2

CX1

OE352 2 Slot Or OE353 - 4 Slot Expansion Board

Belimo Actuator Wiring

Shown. Consult Factory For

Other Manufacturers Wiring

Instructions

As Required - OE353 Is Shown

Return Air Bypass

Damper Actuator

(0-10 VDC)

COM 1

+ 2

Y1 3

Figure 7: Expansion Board Wiring Details For Binary Input, Analog Input and Analog Output Boards

12

VCM Controller

Technical Guide

WARNING!!

10 VA Minimum Power Required For

Each OE352 - 2 Slot Expansion Base Board.

20 VA Minimum Power Required For

Each OE353 - 4 Slot Expansion Base Board

Modular Cable

Connect To VCM Controller

Modular Cable Connect To

Next Expansion Base Board

(When Used)

Configurable Relay Output # 6

Configurable Relay Output # 7

Configurable Relay Output # 8

Configurable Relay Output # 9

Configurable Relay Output # 10

Configurable Relay Output # 11

Configurable Relay Output # 12

Configurable Relay Output # 13

Configurable Relay Output # 14

Configurable Relay Output # 15

Configurable Relay Output # 16

Configurable Relay Output # 17

Configurable Relay Output # 18

Configurable Relay Output # 19

Configurable Relay Output # 20

Configurable Relay Output # 21

R20

PWR LD1

-PS

4RLY IO BD.

OMRON

CONTACT

UL5A250V

G5L-114P

24VDC

-PS

OMRON

CONTACT

UL5A250V

G5L-114P

24VDC

-PS

4RLY IO BD.

OMRON

CONTACT

UL5A250V

G5L-114P

24VDC

-PS

OMRON

CONTACT

UL5A250V

G5L-114P

24VDC

-PS

OMRON

CONTACT

UL5A250V

G5L-114P

24VDC

4RLY IO BD.

-PS

OMRON

CONTACT

UL5A250V

G5L-114P

24VDC

-PS

OMRON

CONTACT

UL5A250V

G5L-114P

24VDC

4RLY IO BD.

OMRON

CONTACT

UL5A250V

G5L-114P

24VDC

-PS

YS101790

-PS

OMRON

CONTACT

UL5A250V

G5L-114P

24VDC

-PS

OMRON

CONTACT

UL5A250V

G5L-114P

24VDC

YS101790

-PS

OMRON

CONTACT

UL5A250V

G5L-114P

CONTACT

UL5A250V

G5L-114P

24VDC

-PS

OMRON

CONTACT

UL5A250V

G5L-114P

24VDC

YS101790

-PS

OMRON

CONTACT

UL5A250V

G5L-114P

24VDC

-PS

OMRON

CONTACT

UL5A250V

G5L-114P

24VDC

YS101790

OMRON

CONTACT

UL5A250V

G5L-114P

24VDC

RN1

74HC04N

ULN2803A/

PCF8574P

Note:

All Relay Outputs Are

Normally Open And Rated

For 24 VAC Power Only.

2 Amp Maximum Load.

OE352 2 Slot Or OE353 - 4 Slot Expansion Board

As Required - OE353 Is Shown

Figure 8: Expansion Board Wiring Details For Relay Expansion Boards

VCM Controller

13

Technical Guide

Input/Output Wiring Details

Space Temperature Sensor

The Space Temperature Sensor is typically used for constant volume

HVAC unit applications controlling one zone. The Space Temperature

Sensor is a 10K Type III thermistor sensor. The Space Temperature

Sensor should be mounted approximately 5 ft. above the floor in the space that is to be controlled. The Space Temperature Sensor is available in a sensor only, sensor with override button, sensor with slide adjust and sensor with slide adjust and override configurations.

Remote SAT Reset Signal

A Remote Supply Air Temperature Reset Signal can be connected to

AIN 7 for applications requiring remote reset of the Supply Air Temperature Setpoint.

When the Slide Offset option on the Room Sensor is used, the Remote

Supply Air Temperature Reset Signal cannot be used. Only one of these options may be used on the VCM controller.

When the Remote Supply Air Temperature Reset Signal option is needed the Slide Offset option on the Room Sensor cannot be used. Only one of these options may be used on the VCM controller.

The VCM controller can accept either a 0-5 VDC signal or a 0-10 VDC signal on this input. When a 0-10 VDC signal is to be used, a resistor must be installed. See Figure 10 for complete Remote Supply Air Temperature Reset Signal wiring details.

See Figure 9 for complete Space Temperature Sensor wiring details.

OE210,OE211, OE212 or OE213

Space Temperature Sensor

TEMP

GND

AUX

AIN1

GND

Note:

Either The Slide Offset Option For The Space

Temperature Sensor Or The Remote Supply Air

Temperature Reset Signal Option (by Others) May Be

Connected To AIN7 On The VCM Controller. Only

One Option Is Allowed, Not Both.

Optional Slide Offset

Wiring Connection For

OE212 or OE213

Sensor Only

AIN7

Figure 9: Space Temperature Sensor Wiring

Note:

When Using 0-10 VDC For The Remote Signal

Source Must Have (2) 10kOhm Resistors Wired As

Shown. When Using 0-5 VDC For The Remote

Signal These Resistors are Not Required And The

Signal Can Be Wired Directly To AIN7 and GND,

Remote Supply Air

Temperature Reset Signal

(By Others)

0-5 VDC or 0-10 VDC Signal

GND

10 kOhm Resistors

Used With 0-10 VDC

Signal Only

AIN7

GND

Note:

Either The Slide Offset Option For The Space

Temperature Sensor Or The Remote Supply Air

Temperature Reset Signal Option (by Others) May Be

Connected To AIN7 On The VCM Controller. Only

One Option Is Allowed, Not Both.

Pullup Resistor PU7 Must Be

Removed When Using The

Remote Supply Air Temperature

Reset Signal Input

Figure 10: Remote Supply Air Temperature Reset Signal Wiring

14

VCM Controller

Technical Guide

Supply & Return Temperature Sensor

For applications that do not use either the AAON

MODGAS II or

MHGRV II boards, the Supply Air & Return Air Temperature Sensors must be wired as shown in the Figure 11 for proper operation. The

Supply Air & Return Air Temperature Sensors are 10K Type III thermistor sensors. The Supply Air Temperature Sensor should be mounted in the unit discharge plenum or in the supply air duct. The Return Air

Temperature Sensor should be mounted in the return air duct. If the system has a Zoning Bypass Damper installed, be sure the return air sensor is located upstream of the bypass duct connection.

Note: If your AAON

HVAC unit uses the MODGAS II

Controller and/or the MHGRV II Controller, the

Supply Air Sensor must be wired to one of these controllers and not to the VCM Controller.

Please see Figure 12 for Supply Air Temperature Sensor Wiring when using the MODGAS II controller and/or the MHGRV II controller. The

Return Air Temperature Sensor always connects to the VCM controller as shown in Figure 11

OE231

Supply Air Temperature Sensor

Mount In HVAC

Unit Supply

Air Duct

OE231

Return Air Temperature Sensor

Mount In HVAC

Unit Return

Air Duct

INPUTS

+VDC

AIN1

AIN2

AIN3

AIN4

AIN5

GND

AOUT1

AOUT2

AIN7

GND

OE331-21-VCM

VCM Controller Board

Figure 11: Supply Air and Return Air Temperature Sensor Wiring- Units Without MODGAS II or MHGRV II

VCM Controller

15

Technical Guide

Input/Output Wiring Details

VALV

GAS

SER.#

CX3

CX4

CX5

V3 V2 V1

EPROM

AUX LOSPD

RAM

128

ADD

128

ADD

SETPOINT

DISCHARGE

LIMIT

RESET

YS101818

BOARD

552PROCESSOR

PHILIPS

CX1

PHILIPS

R2 WDOG

CX6

R15

SHLD

TB2

R26

R25

J01

C2 C1

24VAC

GND

TB3

POWER

GND

RV1

OARD

SAT

YS101826PREV1

GASB

MODULATING

PJ1

C15

SW2

TB5

E VALV

AUX

COM

COMP

FAN

SW1

TUS STA

POWER

COMP

VALV

AUX

FAN

STEP

EPROM

CX3

CX4

CX5

0-10V

THERM

4-20MA

SETUP

AUXIN

RAM

BOARD

552PROCESSOR

YS101818

C3 CX1

RV1

COMM

WDOG

COUT

CX6

C13

N CI

PJ1

COM1-3

RN2

COM4-5

RN4

CX8

D10

R10

D13

R11

U11

VDC

0-5

0-1

VDC

C11

RN3

D17

D18

C18

C19

D16

R27

POWER

PJ2

PJ3

C15

TB5

E VALV

AUX

COMP

FAN

COM

SW1

SW2

TUS STA

POWER

AUX

VALV

COMP

FAN

STEP

EPROM

CX3

CX4

CX5

0-10V

4-20MA

THERM

SETUP

AUXIN

RAM

GND

SAT

BOARD

552PROCESSOR

YS101818

C3 CX1

RV1

COMM

WDOG

UT CO

CX6

C13

N CI

PJ1

D1 D2

COM1-3

RN2

COM4-5

RN4

CX8

D10

R10

D13

U11

R11

VDC

0-1

VDC

0-5

C11

RN3

D17

D18

C18

C19

R27

POWER

D16

PJ2

PJ3

16

D1 D2

COM1-3

RN2

COM4-5

RN4

CX8

D10

R10

D13

R11

U11

VDC

0-5

0-1

VDC

C11

RN3

AIN2

GND

D17

D18

C18

C19

D16

R27

POWER

PJ2

PJ3

PJ1

VALV

GAS

SER.#

CX3

CX4

CX5

V3 V2 V1

EPROM

AUX LOSPD

RAM

128

ADD

128

ADD

SETPOINT

DISCHARGE

LIMIT

RESET

YS101818

BOARD

552PROCESSOR

RV1

OARD

ING

YS101826PREV1

GASB

MODULAT

PJ1

24VAC

GND

TB3

POWER

PHILIPS

CX1

PHILIPS

R2 WDOG

CX6

R15

SHLD

R26

R25

R26

TB2

J01

GND

SAT

D1 D2

COM1-3

RN2

COM4-5

RN4

CX8

D10

R10

D13

U11

R11

VDC

0-5

VDC

0-1

C11

RN3

D17

D18

C18

C19

R27

POWER

D16

PJ2

PJ3

PJ1

VCM Controller

Technical Guide

Outdoor Air Temperature Sensor

The Outdoor Air Sensor must be wired as shown in the illustration below for proper operation of the VCM controller. The Outdoor Air Temperature Sensor is a 10K Type III thermistor sensor. The sensor should be mounted in the upright position as shown, in an area that is protected from the elements and direct sunlight. Be sure to make the wiring splices inside of the Outdoor Air Temperature Sensor weather-tight enclosure.

See Figure 13 for detailed wiring.

Caution:

Be sure to mount the Outdoor Air Sensor in an area that is not exposed to direct sunlight. The shaded area under the HVAC unit rain hood is normally a good location. Unused conduit opening(s) must have closure plugs installed and must be coated with sealing compound to provide a rain tight seal. Water can damage the sensor.

OE250

Outdoor Air

Temperature Sensor

Make Splice Connections

Inside Sensor Enclosure

As Shown. Seal All

Conduit Fittings With

Silicone Sealant.

Mount Sensor Outdoors

In Shaded Protected

Area & In Upright

Position As Shown

INPUTS

+VDC

AIN1

AIN2

AIN3

AIN4

AIN5

GND

AOUT1

AOUT2

AIN7

GND

OE331-21-VCM

VCM Controller Board

Figure 13: Outdoor Air Temperature Sensor Wiring

VCM Controller

17

Technical Guide

Input/Output Wiring Details

Economizer Damper Actuator

The Economizer Damper Actuator Signal voltage output is a 2-10 VDC output. This signal output is used by the VCM controller to modulate the Economizer Damper Actuator in order to control the amount of

Outdoor Air delivered to the HVAC unit for Free Cooling and/or Indoor

Air Quality requirements. See Figure 14 for detailed wiring.

Warning: It is very important to be certain that all wiring is correct as shown in the wiring diagram below.

Failure to observe the correct polarity will result in damage to the actuator or VCM controller.

Economizer Damper Actuator

(Belimo Actuator Shown)

COM 1

Belimo Actuator Wiring

Shown. Consult Factory For

Other Manufacturers Wiring

Instructions

24 VAC Power Source

Sized For Actuator VA Load

EC1

AAON

Unit

Terminals

2-10 VDC

Output

INPUTS

+VDC

AIN1

AIN2

AIN3

AIN4

AIN5

GND

AOUT1

AOUT2

AIN7

GND

OE331-21-VCM

VCM Controller Board

Figure 14: Economizer Damper Actuator Wiring

18

VCM Controller

Technical Guide

Suction Pressure Transducer

The Suction Pressure Transducer is required for any VCM application with DX Cooling that requires Dehumidification. It is also required for any application which utilizes a digital scroll compressor.

has 3 color coded stripped wires on the other end. The stripped wire ends can be spliced to other wires to extend the wiring length when required.

The Suction Pressure Transducer is used to measure suction pressure at the HVAC units DX evaporator coil suction line. This suction line pressure is converted to saturated refrigerant temperature by the VCM controller. This temperature is used by the VCM controller to accurately control the compressors and reheat cycle components to provide optimum performance from the system during Dehumidification operation.

When used in dehumidification applications on HVAC units without digital scroll compressors the Suction Pressure Transducer wires to the

VCM controller board as shown in Figure 15. In this application the

Suction Pressure Transducer connects to the VCM board through a cable with a built-in signal conditioner. The cable is supplied with a 3 pin

Packard mating connector for attachment to the sensor on one end and

For applications that use a Digital Scroll Compressor, the Suction Pressure Transducer wires directly to the Digital Scroll Compressor Controller supplied by the compressor manufacturer. See Figure 16 for wiring details.

In this application the Suction Pressure Transducer connects to the digital scroll compressor with a prefabricated cable similar to the one used in the previous application but without the signal conditioner built in. The signal conditioning is controlled by the Digital Compressor controller.

This cable also has a 3 pin Packard mating connector for attachment to the sensor on one end and has 3 color coded stripped wires on the other end. The stripped wire ends can be spliced to other wires to extend the wiring when required to connect the Digital Compressor controller.

OE275-01-NDC

Suction Pressure

Transducer

With Signal Conditioner

(250 PSIG)

Transducer Cable

With Built-In Signal

Conditioner

+VDC

AIN5

GND

Pullup Resistor PU5

Must Be Removed

OE331-21-VCM

VCM Controller Board

Figure 15: Suction Pressure Transducer Wiring (Units Without Digital Compressors)

VCM Controller

19

Technical Guide

Input/Output Wiring Details

WARNING!!

10 VA Minimum Power Required For

Each 2 Slot Expansion Base Board.

20 VA Minimum Power Required For

Each 4 Slot Expansion Base Board

Connect To VCM Controller

Connect To

Next Expansion Base Board

(When Used)

R20

PWR LD1

AOUT2

1.5 to 5 VDC

GND

OE275-01-NDC

Suction Pressure

Transducer

(250 PSIG)

P4 SHLD

EXC P3

OUT

COM

Copeland Digital

Compressor Controller

OE352 or OE353 Expansion Base Board

INPUTS

+VDC

AIN1

AIN2

AIN3

AIN4

AIN5

GND

AOUT1

AOUT2

AIN7

GND

OE331-21-VCM

VCM Controller Board

Figure 16: Suction Pressure Transducer Wiring (Units With Digital Compressors)

20

VCM Controller

Technical Guide

Supply Fan VFD Signal Or Zoning Bypass Damper Actuator

The Supply Fan VFD or Zoning Bypass Damper Actuator Signal is a 0-

10 VDC output. This signal output can be connected to the Supply Fan Variable

Frequency Drive to modulate the Supply Fan speed and control Duct

Static Pressure utilizing the Duct Static Pressure Sensor connected to the VCM controller board. Alternatively it can be connected to a Zoning Bypass Damper Actuator which will modulate the Zoning Bypass

Damper Actuator to control Duct Static Pressure utilizing the Duct Static

Pressure Sensor connected to the VCM controller board. A Duct Static

Pressure Sensor must be connected in order for the VFD or Zoning

Bypass Damper Actuator to operate. See Figure 17 and Figure 18 for detailed wiring.

Caution:

Variable Frequency Drive units can cause large transient noise spikes which can cause interference to be propagated on other electronic equipment. Use shielded wire wherever possible and route all sensor and controller wiring away from the Variable

Frequency Drive and the HVAC Unit electrical

Caution:

The VFD Unit Must Be Configured For 0-10 VDC Input.

The Input Resistance At The VFD Must Not Be Less

Than 1000 Ohms When Measured At The VFD

Terminals With All Input Wires Removed.

VFD 0-10VDC Input

GND

Supply Fan Variable Frequency Drive

(By Others)

INPUTS

+VDC

AIN1

AIN2

AIN3

AIN4

AIN5

GND

AOUT1

AOUT2

AIN7

GND

OE331-21-VCM

VCM Controller Board

Figure 17: Supply Fan VFD Signal Wiring

24 VAC Power Source

Sized For Actuator VA Load

Bypass Damper Actuator

(Belimo Actuator Shown)

COM 1

GND

24 VAC

0-10 VDC

Belimo Actuator Wiring

Shown. Consult Factory For

Other Manufacturers Wiring

Instructions

Figure 18: Zoning Bypass Damper Signal Wiring

VCM Controller

INPUTS

+VDC

AIN1

AIN2

AIN3

AIN4

AIN5

GND

AOUT1

AOUT2

AIN7

GND

OE331-21-VCM

VCM Controller Board

21

Technical Guide

Input/Output Wiring Details

Binary Inputs Wiring

All Binary Inputs are to be wired as 24 VAC wet contact closures. Only

24 VAC power must be supplied to the OE356 Binary Input Board through a Normally Open Contact closure in order for the signal to be recognized by the controller. If a Dry Contact closure is used , it will not work. See Figure 19 for detailed wiring.

Warning: Do not apply any voltage greater than 24 VAC to the Binary Input Expansion boards. Higher voltages will damage the expansion Board and possibly other components on the system.

WARNING!!

Connect To VCM Controller

10 VA Minimum Power Required For

Each 2 Slot Expansion Base Board.

20 VA Minimum Power Required For

Each 4 Slot Expansion Base Board Connect To Next Expansion Base Board

(When Used)

Exhaust Hood On - N.O. Contact

Dirty Filter - N.O. Contact

Proof Of Flow - N.O. Contact

Remote Forced Occupied - N.O. Contact

Remote Forced Heating - N.O. Contact

Remote Forced Cooling - N.O. Contact

Smoke Detector - N.C. Contact

Remote Forced Dehumidification - N.O. Contact

BIN1

BIN2

BIN3

BIN4

COM

BIN1

BIN2

BIN3

BIN4

COM

R20

PWR LD1

OPTO1

BIN 1

BIN 2

BIN 3

BIN 4

OPTO2

R10

COM

R12

4 DIG. IN MOD. I/O BD.

YS101788

OPTO1

BIN 1

BIN 2

BIN 3

OPTO2

BIN 4

R10

COM

R12

4 DIG. IN MOD. I/O BD.

YS101788

CX2 CX1

OE352 or OE353 Expansion Base Board

Figure 19: Binary Inputs Wiring

22

VCM Controller

Technical Guide

Outdoor Air Humidity Sensor

When used with the VCM controller, the Outdoor Air Humidity Sensor is connected to the system by wiring it to the AIN1 input on the OE354,

4 Analog Input 1 Analog Output Expansion board. It must be wired as shown in Figure 20 for proper controller operation.

Warning: It is very important to be certain that all wiring is correct as shown in the wiring diagram below.

Failure to observe the correct polarity will result in damage to the OA Humidity Sensor or controller.

WARNING!!

Observe Polarity! All boards must be wired with GND-to-

GND and 24VAC-to-24VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion

Boards must be wired in such a way that power to both the expansion boards and the controller are always powered together. Loss of power to the expansion board will cause the controller to become inoperative until power is restored to the expansion board.

OE265-13

OA Humidity Sensor

10 VA Minimum Power Required For

Each 2 Slot Expansion Base Board.

20 VA Minimum Power Required For

Each 4 Slot Expansion Base Board

Connect To VCM Controller

Connect To Next Expansion Base Board

(When Used)

Span

Zero

4 3 2 1

6 5 4 3 2 1

AIN1

0-5 VDC Input

GND

Pullup Resistor PU1 Must

Be Removed As Shown

R20

PWR LD1

AIN1

AIN2

AIN3

AIN4

GND

AOUT1

R10

PU1

PU2

PU3

PU4

LM358

JO1

JO2

JO3

JO4

CX1

4 ANALOG IN MOD. I/O BD.

YS101784

Jumper J01 Must

Be Removed As Shown

OE352 or OE353 Expansion Base Board

4 3 2 1

Jumpers Must Be Set as

Shown For Correct

O-5 VDC Operation

1 & 3 Are Off

2 & 4 Are On

6 5 4 3 2 1

Jumpers Must Be Set as

Shown For Normal

Operation Of Sensor

1, 2, 4, 5 & 6 Are Off

3 Is On

Figure 20: Outdoor Air Humidity Sensor Wiring

VCM Controller

23

Technical Guide

Input/Output Wiring Details

Indoor Wall Mounted Humidity Sensor

When used with the VCM controller, the Indoor Wall Mounted Humidity Sensor is connected to the system by wiring it to the AIN2 input on the OE354, 4 Analog Input, 1 Analog Output Expansion board. It must be wired as shown in Figure 21 for proper controller operation.

Warning: It is very important to be certain that all wiring is correct as shown in the wiring diagram below.

Failure to observe the correct polarity will result in damage to the Space Humidity Sensor or controller.

WARNING!!

Observe Polarity! All boards must be wired with GND-to-

GND and 24VAC-to-24VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion

10 VA Minimum Power Required For

Each 2 Slot Expansion Base Board.

20 VA Minimum Power Required For

Each 4 Slot Expansion Base Board

Connect To VCM Controller

Connect To Next Expansion Base Board

(When Used)

OE265-11

Space Humidity Sensor

Zero

Span

4 3 2 1

6 5 4 3 2 1

AIN2

0-5 VDC Input

GND

Pullup Resistor PU2 Must

Be Removed As Shown

4 3 2 1

Jumpers Must Be Set as

Shown For Correct

O-5 VDC Operation

1 & 3 Are Off

2 & 4 Are On

Jumpers Must Be Set as

Shown For Normal

Operation Of Sensor

1, 2, 4, 5 & 6 Are Off

3 Is On

Figure 21: Indoor Wall Mounted Humidity Sensor Wiring

R20

PWR LD1

AIN1

AIN2

AIN3

AIN4

GND

AOUT1

R10

PU1

PU2

PU3

PU4

LM358

JO1

JO2

JO3

JO4

CX1

4 ANALOG IN MOD. I/O BD.

YS101784

Jumper J02 Must

Be Removed As Shown

OE352 or OE353 Expansion Base Board

24

VCM Controller

Technical Guide

Return Air Mounted Humidity Sensor

When used with the VCM controller, the Return Air Mounted Humidity Sensor is connected to the system by wiring it to the AIN2 input on the OE354, 4 Analog Input, 1 Analog Output Expansion board. It must be wired as shown in Figure 221 for proper controller operation.

Warning: It is very important to be certain that all wiring is correct as shown in the wiring diagram below.

Failure to observe the correct polarity will result in damage to the RA Humidity Sensor or controller.

4 3 2 1

WARNING!!

Observe Polarity! All boards must be wired with GND-to-

GND and 24VAC-to-24VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion

Jumpers Must Be Set as

Shown For Correct

O-5 VDC Operation

1 & 3 Are Off

2 & 4 Are On

10 VA Minimum Power Required For

Each 2 Slot Expansion Base Board.

20 VA Minimum Power Required For

Each 4 Slot Expansion Base Board

OE265-14

RA Humidity Sensor

Connect To VCM Controller

Connect To Next Expansion Base Board

(When Used)

Span

Zero

4 3 2 1

6 5 4 3 2 1

AIN2

0-5 VDC Input

GND

Pullup Resistor PU2 Must

Be Removed As Shown

R20

PWR LD1

AIN1

AIN2

AIN3

AIN4

GND

AOUT1

R10

PU1

PU2

PU3

PU4

LM358

JO1

JO2

JO3

JO4

CX1

4 ANALOG IN MOD. I/O BD.

YS101784

Jumper J02 Must

Be Removed As Shown

OE352 or OE353 Expansion Base Board

6 5 4 3 2 1

Jumpers Must Be Set as

Shown For Normal

Operation Of Sensor

1, 2, 4, 5 & 6 Are Off

3 Is On

Figure 22: Indoor Return Air Mounted Humidity Sensor Wiring

VCM Controller

25

Technical Guide

Input/Output Wiring Details

Building Pressure Sensor Wiring

The OE258 Building Pressure Sensor must be wired as shown in the illustration below for proper operation. There are 3 terminal connections on the OE258 Building Pressure Sensor. Connect the power side of the 24 VAC power source to the terminal labeled “+ EXC” . Connect the GND side of the 24 VAC power source to the terminal labeled “-

COM”. Connect the remaining terminal labeled “OUT” to AIN4 on the

OE354, 4 Analog Output 1 Analog Input Expansion Board terminal block. See Figure 23 below for detailed wiring. The pullup resistor P4 on the expansion board must be removed and the voltage jumper J04 must also be removed as shown in the wiring diagram for the OE258

Building Pressure Sensor to operate correctly.

Warning: It is very important to be certain that all wiring is correct as shown in the wiring diagram below.

Failure to observe the correct polarity will result in damage to the HVAC Unit Controller, Building

Pressure Sensor and the Expansion Board.

WARNING!!

Observe Polarity! All boards must be wired with GND-to-

GND and 24VAC-to-24VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion

10 VA Minimum Power Required For

Each 2 Slot Expansion Base Board.

20 VA Minimum Power Required For

Each 4 Slot Expansion Base Board

Connect To VCM Controller

Connect To Next Expansion Base Board

(When Used)

OE258

Building Pressure Sensor

EXC

OUT

COM

Tubing To Building

Pressure Sensing Location

Tubing To Atmospheric

Pressure Sensing Location

0-5 VDC Input

AIN4

GND

Pullup Resistor PU4 Must

Be Removed As Shown

R20

AIN1

AIN2

AIN3

AIN4

GND

AOUT1

R10

PWR LD1

PU1

PU2

PU3

PU4

LM358

JO1

JO2

JO3

JO4

CX1

T L

I D

4 ANALOG IN MOD. I/O BD.

YS101784

Jumper J04 Must

Be Removed As Shown

OE352 or OE353 Expansion Base Board

Figure 23: Building Pressure Sensor Wiring

26

VCM Controller

Technical Guide

Building Pressure Control

Output Wiring

The Building Pressure Control Output is a 0-10 VDC or 2-10 VDC signal sent from the OE354, 4 Analog Input 1 Analog Output Expansion Board. When using the output for Direct Building Pressure control

(output signal rises on a rise in building pressure), the output signal can be connected to either a Variable Frequency Drive controlling an exhaust fan or to a damper actuator controlling an exhaust damper. When used in this manner the output signal must be configured for Direct

Acting operation.

When using this output for Reverse Building Pressure Control (output signal rises on a fall in building pressure), a damper actuator controlling an OA Damper would be used. When using the OA damper for

Reverse Building Pressure Control, the output signal must be configured for Reverse Acting operation. A Building Pressure Sensor connected to AIN4 on the OE354 Expansion board is used to sense and control the signal to the Building Pressure Output. The OE258 Building Pressure Sensor must be connected in order for the Building Pressure Output to operate correctly.

See Figure 24 for detailed wiring of the Building Pressure Control

Output Signal.

Caution:

Frequency Drive and the HVAC unit electrical wiring.

WARNING!!

Observe Polarity! All boards must be wired with GND-to-

GND and 24VAC-to-24VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion

10 VA Minimum Power Required For

Each 2 Slot Expansion Base Board.

20 VA Minimum Power Required For

Each 4 Slot Expansion Base Board

Connect To VCM Controller

Connect To Next Expansion Base Board

(When Used)

Wiring When Using Damper Actuator

For Building Pressure Control

Belimo Actuator Wiring

Shown. Consult Factory For

Other Manufacturers Wiring

Instructions

Building Pressure Control

Damper Actuator

(By Others - Belimo Actuator Shown)

COM 1

GND

24 VAC

R20

PWR LD1

Both Types Of Building Pressure Control

Devices Are Shown

Only One Type Of Building Pressure Control

Device May Be Used On Each HVAC Unit

Building Pressure Control

Exhaust Fan Variable Frequency Drive

(By Others)

GND

The VFD Unit Must Be Configured For 0-10vdc Input. The

Input Resistance At The VFD Must Not Be Less Than 1000

Ohms When Measured At The VFD Terminals With All

Input Wires Removed.

GND

AOUT1

AIN1

AIN2

AIN3

AIN4

GND

AOUT1

R10

PU1

PU2

PU3

PU4

LM358

JO1

JO2

JO3

JO4

CX1

T L

4 ANALOG IN MOD. I/O BD.

YS101784

0-10VDC or 2-10 VDC

(Configurable)

OE352 or OE353 Expansion Base Board

Wiring When Using Exhaust Fan VFD

For Building Pressure Control

Figure 24: Building Pressure Control Output Wiring

VCM Controller

27

Technical Guide

Input/Output Wiring Details

CO

Sensor Wiring

The OE255 or OE256 CO

Sensors are used to sense the current CO

2 level in the conditioned space. The pullup resistor PU3 must be removed and the voltage jumper J03 must be in position (0-10 VDC position ) on the OE354, 4 Analog Input 1 Analog Output Expansion Board for proper operation of the CO

Sensor. See Figure 25 for detailed wiring.

Warning: It is extremely important to be certain that the

Sensors “AC/GND” terminal is connected to the GND terminal on the OE354 expansion board and to the 24 VAC expansion base board power source GND connection. The “AC+/DC+ ” terminal on the CO

Sensor must be connected to the 24 VAC power side of the 24 VAC power source supplying power to the expansion base board terminal as shown. Failure to observe the correct polarity will result in damage to the HVAC

Unit Controller, CO

Sensor and the Expansion

Board.

WARNING!!

Observe Polarity! All boards must be wired with GND-to-

GND and 24VAC-to-24VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion

10 VA Minimum Power Required For

Each 2 Slot Expansion Base Board.

20 VA Minimum Power Required For

Each 4 Slot Expansion Base Board

Connect To VCM Controller

Connect To Next Expansion Base Board

(When Used)

OE255 or OE256

(0-10VDC Signal)

AIN3

0-10 VDC Input

GND

Pullup Resistor PU3 Must

Be Removed As Shown

R20

PWR LD1

AIN1

AIN2

AIN3

AIN4

GND

AOUT1

R10

PU1

PU2

PU3

PU4

LM358

JO1

JO2

JO3

JO4

CX1

4 ANALOG IN MOD. I/O BD.

YS101784

Jumper J03 Must

Be In Place As Shown

OE352 or OE353 Expansion Base Board

Figure 25: CO

Sensor Wiring

28

VCM Controller

Technical Guide

Modulating Heating Device Wiring

The Modulating Heating Device signal can be configured for either a

0-10 VDC or 2-10 VDC output signal. The output signal can be configured for either Direct Acting or Reverse Acting operation as required.

The Output signal is normally used to control a Modulating Hot Water

Valve, Modulating Steam Valve or for SCR Control of an Electric Heating Coil.

See Figure 26 for detailed wiring of the Modulating Heating Device.

Warning: It is very important to be certain that all wiring is correct as shown in the wiring diagram below.

Failure to observe the correct polarity could result in damage to the Modulating Heating Device or the Analog Output expansion board.

WARNING!!

Observe Polarity! All boards must be wired with GND-to-

GND and 24VAC-to-24VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion

10 VA Minimum Power Required For

Each 2 Slot Expansion Base Board.

20 VA Minimum Power Required For

Each 4 Slot Expansion Base Board

Connect To VCM Controller

Connect To Next Expansion Board

(When Used)

The Modulating Heating Device Used Must Be Designed To

Accept Either a 0-10 Or a 2-10 VDC Input. The AOUT1

Output Voltage Is User Configurable For Either Voltage. The

Heating Device Used Can Be A Modulating Hot Water Valve,

Steam Valve Or SCR Controlled Electric Heating Coil.

0-10 VDC or 2-10 VDC

(Configurable)

GND

Modulating Heating Device

(By Others)

AOUT1

GND

R20

PWR LD1

AOUT1

AOUT2

AOUT3

AOUT4

GND

4 AOUT MOD. I/O BD.

YS101786

CX2

CX3

CX1

OE352 or OE353 Expansion Base Board

Figure 26: Modulating Heating Device Wiring

VCM Controller

29

Technical Guide

Input/Output Wiring Details

Modulating Cooling Device Wiring

The Modulating Cooling Device signal can be configured for either a

0-10 VDC, 2-10 VDC or 1.5-5.0 VDC output signal. The output signal can also be configured for either Direct Acting or Reverse Acting operation as required by your application. This signal output would normally be connected to a Modulating Chilled Water Valve or Digital

Compressor Controller.

to the Digital Compressor Controller instead of the VCM board and the

Modulating Cooling Output signal must be configured for a 1.5 to 5.0

VDC output signal. For Digital Compressor wiring details see Figure 16.

Warning: It is very important to be certain that all wiring is correct as shown in the wiring diagram below. Failure to observe the correct polarity could result in damage to the Modulating Cooling Device.

See Figure 27 for detailed wiring of the Modulating Cooling Device when using a Chilled Water Valve. When this output is used with a

Digital Compressor, the Suction Line Pressure Transducer must be wired

WARNING!!

Observe Polarity! All boards must be wired with GND-to-

GND and 24VAC-to-24VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion

10 VA Minimum Power Required For

Each 2 Slot Expansion Base Board.

20 VA Minimum Power Required For

Each 4 Slot Expansion Base Board

Connect To VCM Controller

Connect To Next Expansion Board

(When Used)

The Modulating Cooling Device Used Must Be Designed

To Accept Either A 0-10 VDC, 2-10 VDC Or 1.5-5.0 VDC

Input. The AOUT1 Output Voltage Is User Configurable

For These Voltages. The Cooling Device Used Can Be A

Modulating Chilled Water Valve or A Digital Scroll

Compressor. If Using A Digital Scroll Compressor

Please See Digital Scroll Detailed Wiring Information In

This Manual.

0-10 VDC, 2-10 VDC or 1.5-5.0 VDC

(Configurable)

GND

AOUT2

GND

Modulating Cooling Device

(By Others)

R20

PWR LD1

AOUT1

AOUT2

AOUT3

AOUT4

GND

4 AOUT MOD. I/O BD.

YS101786

CX2

CX3

CX1

OE352 or OE353 Expansion Base Board

Figure 27: Modulating Cooling Device Wiring

30

VCM Controller

Technical Guide

Return Air Bypass Wiring

The VCM controller can be configured for PAC or DPAC control schemes. Both PAC and DPAC control schemes provide improved moisture removal capabilities while utilizing internal space loads for reheat by redirecting the Return Air around the Evaporator Coil instead of through the coil. See the PAC and DPAC applications section of this manual for complete operation details.

The DPAC control scheme provides improved moisture removal capabilities and tighter temperature control than the PAC controls scheme by combining Digital Compressor control in addition to Return Air

Bypass control.

See Figure 28 for detailed wiring of the Return Air Bypass and Return

Air Damper Actuators.

See Figure 16 for detailed wiring of the Digital Compressor.

The PAC & DPAC control schemes both utilize a Return Air Bypass

Damper Actuator and a Return Air Damper Actuator to modulate the

Return Air and Return Air Bypass Dampers to control the amount of air that is redirected around the Evaporator Coil.

Warning: It is very important to be certain that all wiring is correct as shown in the wiring diagram below.

Failure to observe the correct polarity could result in damage to the Damper Actuators or the

Analog Output expansion board.

WARNING!!

Observe Polarity! All boards must be wired with GND-to-

GND and 24VAC-to-24VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion

10 VA Minimum Power Required For

Each 2 Slot Expansion Base Board.

20 VA Minimum Power Required For

Each 4 Slot Expansion Base Board

Connect To VCM Controller

Connect To Next Expansion Board

(When Used)

GND

Return Air

Damper Actuator

(0-10 VDC)

COM 1

+ 2

Y1 3

0-10 VDC

Return Air Bypass

Damper Actuator

(0-10 VDC)

COM 1

+ 2

Y1 3

Belimo Actuator Wiring

Shown. Consult Factory For

Other Manufacturers Wiring

Instructions

Figure 28: Return Air Bypass Wiring

VCM Controller

AOUT3

AOUT4

GND

R20

PWR LD1

AOUT1

AOUT2

AOUT3

AOUT4

GND

4 AOUT MOD. I/O BD.

YS101786

CX2

CX3

CX1

OE352 or OE353 Expansion Base Board

31

Technical Guide

Start-up & Commissioning

In order to have a trouble free start-up it is important to follow a few simple procedures. Before applying power for the first time it is very important to correctly address the controller and run through a few simple checks.

Controller Addressing

All VCM controllers are equipped with address switches. If the VCM controller is to operate as a stand alone system (not connected to any other HVAC unit or VAV/Zone controllers) the controller address switch should be set for address 1. When using the Modular Service Tool or

System Manager to program and configure the VCM controller you would enter this address to communicate with the controller. When the system is to be connected to other HVAC unit controllers on a communication loop, each controllers address switch must be set with a unique address between 1 and 59. When the VCM controller will be used with

VAV/Zone controllers the VCM controller’s address switch must be set as address 59, no exception. See Figure 29 for address switch setting information. For detailed information regarding communication wiring and connection for interconnected and networked systems, please see the Orion System Installation & Troubleshooting Guide.

Power Wiring

One of the most important checks to make before powering up the system for the first time, is to confirm proper voltage and transformer sizing for the controller. Each VCM controller requires 8 VA of power delivered to it at 24 VAC. Each 2 slot expansion board requires 10 VA at 24 VAC and each 4 slot expansion board requires 20 VA at 24 VAC.

You may use separate transformers for each device (preferred) or power several devices from a common transformer. If several devices are to be powered from a single transformer correct polarity must be followed.

Warning: Observe Polarity! All boards must be wired with

GND-to-GND and 24 VAC-to-24 VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion Boards must be wired in such a way that the Expansion Boards and the VCM Controller are always powered together.

Loss of power to the Expansion Board will cause it to become inoperative until power is restored to the Expansion Board.

Check all wiring leads at the terminal block for tightness. Be sure that wire strands do not stick out and touch adjacent terminals. Confirm that all sensors required for your system are mounted in the appropriate location and wired into the correct terminals on the VCM controller. Be sure any Expansion Boards connected to the VCM controller are also correctly wired just as you did for the VCM controller.

After all the above wiring checks are complete, apply power to the

VCM controller and all expansion boards connected to it.

This Switch Should Be

In The OFF Position

As Shown

ADDRESS

ADD

TOKEN

NETWORK

ADDRESS

ADD

Controller

Address Switch Shown Is

Address Switch

Address Switch Shown Is

Set For Address 1

Set For Address 13

The Address For Each Controller

Must Be Unique To The Other Controllers

On The Local Loop And Be Between 1 and 59

Note:

The Power To The Controller Must Be Removed And

Reconnected After Changing The Address Switch Settings

Caution

Disconnect All Communication Loop Wiring From The

Controller Before Removing Power From The Controller.

Reconnect Power And Then Reconnect Communication Loop

Wiring.

INPUTS

TB3

+VDC

RN5

AIN1

AIN2

AIN3

AIN4

AIN5

GND

C10

GND

AOUT1 C12

AOUT2

AIN7

GND

PJ1

C17

D15

PU1

PU2

PU3

PU4

PU5

D11

PU7

D14

ADDRESS

SW1

ADD

TOKEN

NETWORK

U10

JP1

U13

CX13

U15

CX10

R15

C14

R19

U14

U12

CX14

C15

R22

R24

R25

C20

CX15

CX12

R26

PRESSURE

SENSOR

EXPANSION

VR1

D12

R13

SC1

D19

VR2

C13

C16

TB4

GND

24VAC

Figure 29: VCM Controller Address Switch Setting

32

VCM Controller

Technical Guide

Initialization:

On system power up a 30 second startup delay is performed where all default setpoints are initialized, LED’s are initialized and all outputs are turned off.

When power is first applied, LED 1 and LED2 will flash out the controller address. LED1 will flash to represent Tens. LED2 will flash to represent Ones. After the controller address is complete, there will be a short pause and then 60 fast flashes to represent controller initialization. There will be no controller operation or communications during initialization. After initialization, LED1 & LED2 will continuously flash the status code.

Programming The Controller

The next step is programming the controller for your specific requirements. In order to configure and program the VCM controller you must use an operator interface. Four different operator interfaces are available for programming and monitoring of the VCM controller. These are:

•

Modular Service Tool

•

Modular System Manager

•

Tactio SI Touch Screen Interface

•

Notebook or Desktop Computer With

Prism II Computer Front End Software Installed

Example of a controller address of 59:

LED1 will flash 5 times. LED2 will flash 9 times.

See Table 2 in the Troubleshooting Section of this manual for detailed diagnostic blink code information.

Operating Summary

There is a standard set of operating instructions that are continuously repeated during normal operations. They are listed below.

1.) Read Analog Inputs for Temperatures, Pressures and Binary

Contact Closures

2.) Calculate Occupied / Unoccupied Mode of Operation

3.) Calculate HVAC Mode of Operation

4.) Set all outputs to match calculations for Heating or Cooling or vent Mode

5.) Broadcast information to other controllers if configured.

6.) Log all temperatures and output conditions

7.) Repeat steps 1 through 6 continuously

Any of these devices or a combination of them can be used to access the status, configuration and setpoints of any controller on your communications loop. See the Operator Interfaces Technical Guide for complete

VCM controller programming instructions if you are going to be using the Modular Service Tool or Modular System Manager with your system.

If you are going to be using a Notebook or Desktop computer and the

Prism II Computer Front End Software, please see the Orion Prism II

Computer Front End Technical Guide. If you will be using the Tactio SI

Interface please see the Tactio SI Touch Screen Technical Guide. No matter which operator interface you use, it is recommended that you proceed with the programming and setup of the VCM controller in the order that follows:

1.) Configure The Controller For Your Application

2.) Program The Controller Setpoints.

3.) Program The Controller Operation Schedules.

4.) Set The Controller Current Time And Date.

5.) Review Controller Status Screens To Verify System

Operation And Correct Controller Configuration

Mode

Selection

STATUS PREV

SETPOINTS

SCHEDULES

OVERRIDES

ALARMS

CONFIGURATION

BALANCE - TEST

DEC

ESC

DOWN

CLEAR

ENTER

System Manager

DEC

MINUS

ESC

DOWN

CLEAR

ENTER

STATUS

SETPOINTS

SCHEDULES

OVERRIDES

ALARMS

Figure 30: Modular Service Tool & Modular System Manager Operator Interfaces

VCM Controller

33

Technical Guide

Inputs & Outputs

VCM Controller

AIN1 - Space Temperature Sensor Input

If you want to generate Occupied or Unoccupied Heating and Cooling demands based on Space Temperature, select this Sensor for the HVAC

Mode enable. The Space Temperature Sensor can be used for Night

Setback control regardless of the HVAC Mode Sensor selected. If the

Space Temperature Sensor used is equipped with the optional Pushbutton Override Feature, this input will detect user overrides from Unoccupied back to Occupied operation for a user adjustable amount of time. This Sensor is not required for Cooling Only HVAC units configured for Supply Air Temperature control as the HVAC Mode Enable

Sensor, unless Night Setback operation is required. The Space Temperature can also be configured to reset the Supply Air Temperature

Setpoint. The Space Temperature Sensor is the only Sensor that can be used for Night Setback operation during the Unoccupied Mode.

AIN2 - Supply Air Temperature Sensor Input

The Supply Air Temperature Sensor is the default HVAC Mode Enable

Sensor. For typical VAV units that are Cooling Only with Morning Warmup, this Sensor should be configured as the HVAC Mode Enable Sensor. Heating will only occur during Morning Warm-up. After Morning

Warm-up expires, the Supply Air Temperature will be maintained at the

Supply Air Temperature Cooling Setpoint. The HVAC unit must always have a Supply Air Temperature Sensor installed.

AIN3 - Return Air Temperature Sensor Input

If you want to generate occupied Heating and Cooling demands based on Return Air Temperature, select this Sensor as the HVAC Mode Enable Sensor. The Return Air Temperature Sensor is also used to initiate or cancel the Morning Warm-up Period. This temperature must be at least 5°F above the Outdoor Air Temperature to allow Economizer-

Cooling operation.

AIN4 - Outdoor Air Temperature Sensor Input

The Outdoor Air Temperature is used to lockout Heating or Cooling to conserve energy at whatever temperature the user deems appropriate for each Mode of operation. The Outdoor Air Temperature Sensor can also be used to provide Low Ambient Temperature Protection in the building. If the Outdoor Air Temperature is below the Low Ambient

Temperature Setpoint, the Preheat Relay Output will be maintained during Occupied operation and will not be allowed to stage off unless the

Supply Fan is turned off. When using 100% (MUA Units) Outdoor Air applications, the Outdoor Air Temperature Sensor should be configured as the HVAC Mode Enable Sensor. The Outdoor Air Temperature

Sensor is also used in combination with the Outdoor Air Humidity Sensor for Dewpoint calculations.

AIN5 – Suction Pressure Sensor Input

A Suction Pressure Sensor can be connected to this input. This Sensor is required when using Dehumidification with DX Cooling units. The

VCM controller converts the Suction Pressure reading to Suction Temperature. This calculated Evaporator Coil Temperature, is considered to be the Saturation Vapor Pressure of the refrigerant leaving the evaporator coil. In most cases, the Supply Air Temperature leaving the Evaporator coil will be 10°F to 15°F higher than the calculated Evaporator

Coil Temperature.

Note: All temperature Sensors must be Thermistor Type III which provide 77.0°F @ 10 K Ohms Resistance.

AIN6 - Duct Static Pressure Sensor Input

This special phone jack style input connection accepts a Duct Static

Pressure Sensor input modular cable. The Duct Static Pressure Sensor reading is used to determine current Duct Static Pressure. This Static

Pressure reading is used to control the output signal supplied to the

Supply Fan VFD or Zoning Bypass Damper Actuator. If you have configured the HVAC unit for Constant Volume operation, this Sensor is optional. If it is installed on a Constant Volume unit, it will not affect operation, it will be used as a status only reading.

AIN7 – Space Temp. Sensor Slide Adjust or

Remote SAT Reset Signal Input

AIN 7 on the VCM controller is a dual purpose input. It can be used for the Space Sensor Slide Adjust option or for connection of the Remote

Supply Air Setpoint Reset Signal option. Only one or the other can be used not both.

Space Temperature Sensor Slide Adjust

If the Space Temperature Sensor being used has the optional Slide Adjust feature, its AUX output is connected to this input. The Slide Adjust control is used to vary the HVAC Mode Heating and Cooling Setpoints by a user configured maximum amount. The Slide Adjustment adjusts whichever Temperature Sensor that has been configured as the HVAC

Mode Enable Sensor even if that Sensor is not the installed Space Temperature Sensor.

If Space Temperature is configured as the SAT/Reset Source, the Slide

Adjustment adjusts both the HVAC Mode Enable Heating and Cooling setpoints and the SAT/Reset Source Heating and Cooling setpoints simultaneously by a user configurable maximum amount.

Remote Supply Air Temperature Reset Signal

When a 0-5 VDC Remote Supply Air Temperature Reset Signal is to be used, the controller must be configured for it and the Room Sensor

Slide Offset setpoint must be set to zero for this option. If the slide offset is not set to zero, the Supply Air Temperature Reset will not function.

The Remote Supply Air Temperature Reset signal must be configured so its setpoint will be at the coldest Supply Air Temperature at 0 VDC and its setpoint will be at the warmest Supply Air Temperature at 5

VDC.

If a 0-10 VDC reset signal is used, a resistor network will need to be installed on AIN 7. See the VCM wiring diagram for details.

AOUT1 - Economizer Control Signal

This voltage signal (2-10 VDC) is used to position the Outdoor Air

Damper during Economizer Control. It is also used to maintain the

Outdoor Air Damper at its Minimum Position during the Occupied Mode when the Outdoor Air Temperature and/or Outdoor Humidity is not suitable for Economizer Cooling purposes.

34

VCM Controller

Technical Guide

AOUT2 - Duct Static Pressure Control Signal

This voltage signal (0-10 VDC) can be connected to a Supply Fan VFD or to Proportional Inlet Vanes to control the Duct Static Pressure. This signal can also be connected to a 0-10 VDC Modulating Zoning Bypass

Damper Actuator to control Duct Static Pressure. When this signal is used to control a Zoning Bypass Damper Actuator, the Zoning Bypass

Damper Actuator needs to be mechanically configured to close the Zoning Bypass Damper on an increase of the 0-10 VDC output signal. This is necessary because the signal is Direct Acting and is not configurable as a Reverse Acting Signal on the VCM controller.

R1 - Supply Fan (Enable)

This is a non-configurable output.

R2 Thru 5 - User Configurable Relays

These relays are configurable by the user. For all the available configuration options see the OE357 4 Relay Output Expansion Board section of this manual.

OE354 (4) Analog Input

(1) Analog Output Expansion Board

AIN1 - Outdoor Air Humidity Sensor Input

This input is used to connect an Outdoor Air Humidity Sensor that, combined with the Outdoor Air Temperature Sensor reading, is used to calculate a Dewpoint and/or Wetbulb Temperature. Outdoor Air

Dewpoint Temperature is used to activate the Dehumidification Mode on MUA and CAV configured units which utilize the Dual Damper

Mode (Hood On/Off) control feature. The Wetbulb Temperature is used for Economizer enthalpy control.

AIN2 – Indoor Air Humidity Sensor Input

The Indoor Air Humidity Sensor is used to activate Dehumidification

Mode on a VAV or CAV unit. The Sensor can be either a Wall Mounted

Space Humidity Sensor or a Return Air Duct Mounted Humidity Sensor.

AIN3 - CO

Sensor Input

This Sensor is required if you need to monitor Indoor Air Quality and modify the Economizer operation based on levels of CO

2 or building you are monitoring. The CO

in the space

Sensor can be either a Wall

Mounted CO

Sensor or and Return Air Mounted CO

Sensor as required by your specific application.

AIN4 - Building Pressure Sensor Input

This Sensor is only required if you wish to configure the VCM Controller for Building Pressure Control. Building Pressure Control can be accomplished by using one of two main control methods. One control method uses the 0-10 VDC signal to control an Exhaust Fan VFD or an

Exhaust Damper Actuator for Direct Acting Pressure Control applications. In addition, for Reverse Acting Pressure Control applications it can control an Outdoor Air Damper Actuator. The other available control method is to configure one of the Output Relays as an Exhaust Fan output which will activate the Exhaust Fan anytime the Building Pressure is above the Building Pressure Setpoint.

AOUT1 - Building Pressure Control Signal

This voltage signal (0-10 VDC) is used to provide an output signal to a

Building Pressure Control device. The output signal can be connected to either an Exhaust Fan VFD or an Exhaust Damper Actuator when

Direct Acting Building Pressure Control is required. When Reverse

Acting Building Pressure Control is required, the output signal would be connected to an Outdoor Air Damper Actuator. When used in this application the output signal must be configured for Reverse Acting

Operation.

OE355 (4) Analog Output

Expansion Board

AOUT1 – Modulating Heating Signal

This output signal can be configured for either 0–10 VDC or a 2-10

VDC output signal. This signal can be configured for either Direct Acting or Reverse Acting operation. This output signal is used to operate a

Modulating Heating Device to maintain the Heating Supply Air Temperature Setpoint.

AOUT2 – Modulating Cooling Signal

This output signal can be configured for either 0–10 VDC, 2-10 VDC or 1.5-5.0 VDC output signals. This signal can be configured for either

Direct Acting or Reverse Acting operation. This output signal is used to operate a Modulating Cooling Device to maintain the Cooling Supply

Air Temperature Setpoint. If your unit uses a Digital Compressor this must be configured for a 1.5-5.0 VDC output signal.

AOUT3 – Return Air Damper Signal

This output signal is a Direct Acting 0–10 VDC output signal that is used to modulate a Return Air Damper Actuator in concert with a Return Air Bypass Damper Actuator for PAC or DPAC control schemes.

AOUT4 – Return Air Bypass Damper Signal

This output signal is a Direct Acting 0–10 VDC output signal that is used to modulate a Return Air Bypass Damper Actuator in concert with a Return Air Damper Actuator for PAC or DPAC control schemes.

OE357 (4) Relay Expansion Boards

R6 – R21 User Configurable Relay Outputs

Relays can be configured in any order but we recommend that they be configured in the following order:

Cooling stages

Heating stages

Warm–up Mode Command (for VAV Boxes)

Reversing Valve (for Air to Air Heat Pumps)

Reheat

Exhaust Fan

Pre-Heater (for Low Ambient Protection)

Alarm

Override

10. Occupied

11. Economizer

VCM Controller

35

Technical Guide

Inputs & Outputs

By using all (4) of the available 4 Relay Expansion Boards and the 4 relay outputs available on the VCM controller, you have the ability to configure up to a combined total of 20, Heating Stages, Cooling Stages, and options 3 through 11 listed above.

OE356 Binary Expansion Board #1

BIN2 - Remote Forced Cooling Mode Input

This wet contact input is used to provide a means for another BAS or control device (by others) to force the unit into Cooling Mode when it closes. See the Note regarding Remote Force Mode Setting that follows at the end of this section.

Note: The Binary Inputs require wet contacts (24 VAC only) to recognize an active input. If you provide dry contacts, the contact closure will not be recognized

BIN1 – Exhaust Hood On Input

When this wet contact input closes the VCM controller switches from

Indoor Air Control to Outdoor Air Control. This is typically used on

CAV applications requiring Dual Damper (Hood On/Off) Modes.

BIN2 - Dirty Filter Contact Closure Input

This wet contact input is required for Filter Status Indication and requires a Differential Pressure Switch to initiate “Dirty Filter” indication.

BIN3 – Proof of Flow Input

A Proof of Flow Switch that provides a wet contact closure whenever the HVAC unit Supply Fan is operating can be connected to this input.

If the Proof of Flow Switch contact opens while the Supply Fan is operating, all Heating and Cooling is suspended or disabled. The Proof Of

Flow Switch is an optional input. This means the VCM controller must be configured by the user to recognize this input signal.

BIN4 – Remote Forced Occupied Mode Input

When this wet contact input closes, it will force the VCM controller into the Occupied Mode. When the Remote Forced Occupied Signal is removed, the controller will revert to the Unoccupied Mode of operation if no internal or external schedule has been configured or is in effect when this occurs.

OE356 Binary Expansion Board #2

BIN1 – Remote Forced Heating Mode Input

This wet contact input is used to provide a means for another BAS or control device (by others) to force the unit into Heating Mode when it closes. See the Note regarding Remote Force Mode Setting that follows at the end of this section.

Note: Remote Forced Heating or Cooling Modes require that the user enter zero values for both the Heating and

Cooling Setpoints for the HVAC Mode Enable. The

VCM Controller will then look for wet contact closures on the Remote Forced Cooling Mode and

Remote Forced Heating Mode inputs to enable the

HVAC Modes. If both the Remote Forced Heating and

Remote Forced Cooling Modes are active, the unit will operate in Vent Mode. The unit may also be operated in Vent Mode by providing a wet contact closure signal to the Remote Occupied Input.

BIN3 – Smoke Detector Input

This wet contact input is used to initiate shutdown of the HVAC unit when a Smoke Detector (by others) contact closure occurs. The controller remains active and can initiate alarm relays.

BIN4 – Remote Forced Dehumidification

This wet contact input is used to provide a means for another BAS or control device (by others) to force the VCM controller into Dehumidification Mode.

Note: When using the Remote Forced Dehumidification function the user must set the Dehumidification Spt

Indoor RH to 100% for the Remote Forced

Dehumidification feature to function.

36

VCM Controller

Technical Guide

Sequence Of Operations

Occupied/Unoccupied

Mode of Operation

The VCM controller can utilize several methods for determining the

Occupied Mode of Operation. These are:

Forced Schedule

Remote Forced Occupied Signal

Internal Schedule

Push Button Override Signal

Forced Schedule

The VCM controller can be forced into the Occupied Mode by inputting a Forced Schedule from any operator interface.

Remote Forced Occupied Signal

When this wet contact input closes, it will force the VCM controller into the Occupied Mode. When the Remote Forced Occupied Signal is removed, the controller will revert to the Unoccupied Mode of operation if no Internal or External Schedule has been configured or is in effect when this occurs.

You can still use the Space Temperature Sensor input for an Override

Command even when a Space Temperature Sensor is not connected.

Simply provide a Momentary Push-Button connected between AIN1 and the Ground Terminal on the same terminal block. Follow the above procedure for initiating Overrides, even on Supply Air Temperature Controlled Cooling only HVAC units.

HVAC Modes of Operation

There are 6 possible HVAC Modes of Operation. They are:

Vent Mode

Cooling Mode

Dehumidification

Heating Mode

Warm-Up Mode

Off Mode

Vent Mode Operation

This Mode only applies to the Occupied Mode of Operation. The Vent

Mode is defined as the Supply Fan running with no Heating, Cooling or

Dehumidification demand.

Note: If the Remote Forced Occupied Mode is to be used, it is necessary to set all the Internal Week Schedules to

‘0’ so that the Internal Schedule always commands the

Unoccupied Mode.

Vent Mode can occur during the Occupied Mode if the Space, Return or

Outdoor Air Temperature Sensors are selected as the HVAC Mode Enable Sensor. Vent Mode can also occur if the Supply Air Temperature

Sensor is the HVAC Mode Enable Sensor and the VCM has been configured for Remote Forced Heating and Cooling. See the Remote Con-

trol of HVAC Mode section in this manual for complete details.

Internal Week Schedule

An Internal Week Schedule, which supports up to two start/stop events per day, is available for determining Occupied and Unoccupied Schedules. If you are using the Internal Schedule, an Optimal Start calculation is also available. See the Scheduling Section of this manual for more information on the Optimal Start Feature.

Push Button Override Signal

During Unoccupied hours, the user can force the VCM controller back to Occupied operation by pressing the Override Button on the Space

Temperature Sensors for a period of less than 3 seconds. This initiates the Override or resets the Override Timer back to zero during Unoccupied hours of operation.

Note: During Vent Mode, all Cooling and Heating Stages are deactivated and the Economizer Damper is maintained at a Minimum Position to provide fresh air into the building. The Static Pressure is still maintained by the

Supply Fan VFD or Zoning Bypass Damper Signal since the Supply Fan is still operating in this Mode.

Cooling Mode Operation

Occupied Cooling Mode occurs whenever the HVAC Mode Enable Temperature is above the HVAC Mode Enable Cooling Setpoint. Unoccupied Cooling Mode only occurs if a Space Temperature Sensor is connected to the VCM, or a broadcast of Space Temperature is being received from an Averaging Broadcast Controller and only then if the

Space Temperature is above the Cooling Setpoint.

During Override operations, the user can cancel the Override by pressing the Override Button for a period of time between 3 seconds and 10 seconds. This restores the VCM controller to Normal Unoccupied Operation.

If the Override Button is held for more than 10 seconds, it causes a

Space Sensor Failure Alarm. This is due to the fact that the Override

Button actually shorts the Space Temperature Sensor input to ground. If this input is shorted to ground or left floating with no Space Temperature Sensor detected for more than 10 seconds, it is considered a Space

Temperature Sensor failure.

The Mechanical Cooling will be disabled if the Outdoor Air Temperature is below the Cooling Lockout Setpoint by 1°F. This gives a 2°F hysteresis around the Cooling Lockout Setpoint to prevent unwanted cycling in and out of Mechanical Cooling Mode. If the Outdoor Air

Temperature disables the Mechanical Cooling while it is currently operating, the Mechanical Cooling will stage off if all staging and run times are satisfied.

If the Economizer has been enabled for operation, it is used as the first stage of Cooling and the Mechanical Cooling will be activated if necessary. See the Economizer Operation section for a more detailed operating sequence.

VCM Controller

37

Technical Guide

Sequence Of Operations

No matter which Sensor is configured for the HVAC Mode Enable or if the Remote BAS sets the Mode through Remote Forced Cooling, the

Supply Air Temperature is always controlled to the Active Supply Air

Temperature Setpoint while in the Cooling Mode..

Stage Control Window

The Cooling Stage Control Window Setpoint determines when the compressors start to stage up and stage down. In the Cooling Mode, as the

Supply Air Temperature rises above the Active Supply Air Temperature

Setpoint, the Cooling Stages will begin to stage on based on the Cooling Stage Up Delay setting. The Cooling Stages will continue to run until the Supply Air Temperature drops below the Active Supply Air

Temperature Setpoint minus the Cooling Stage Control Window. For example if the Supply Air Temperature Setpoint is 55° and the Cooling

Stage Control Window is 5°, as the Supply Air Temperature drops below 50°, the Cooling Stages will begin to stage off based on the Cooling Stage Down Delay setting.

A Digital Compressor is a Variable Capacity Compressor that has a 10 to 1 turn down ratio. The VCM is capable of handling a single stage

Cooling unit with a Digital Compressor as its only stage. It is also capable of handling multistage Cooling units with a Digital Compressor.

The Digital Compressor is always the first stage of Cooling. On multistage Cooling units with a Digital Compressor, Fixed Capacity Compressors will stage up while the Digital Compressor modulates to achieve the Active Supply Air Temperature Setpoint. A three compressor Cooling unit with a Digital Compressor is the only special staging arrangement.

On three compressor Cooling units with a Digital Compressor, the first stage of Cooling is the Digital Compressor. The second stage of Cooling is a Fixed Capacity Compressor, equal to the maximum capacity of the Digital Compressor. The third stage of Cooling is a Fixed Capacity

Compressor with double the capacity of the second compressor. When the third stage of Cooling activates, the second stage (compressor) of

Cooling deactivates. The fourth stage of Cooling is when the second stage (compressor) of Cooling is reactivated. In this way, a three compressor Cooling unit with a Digital Compressor becomes four stages of

Cooling.

Cooling Staging Delay

Minimum Off Time

A Cooling Stage cannot be activated unless it has been off for this amount of time.

Minimum Run Time

After a Cooling Stage has been activated, it must remain on for this amount of time.

Staging Up Delay

After the first Cooling Stage has been activated, this delay prevents additional stages from activating too quickly before they are needed to achieve the Active Supply Air Temperature

Setpoint.

Staging Down Delay

After a Cooling Stage has met its Minimum Run Time and is not needed, this delay prevents additional stages from deactivating too quickly in case they are needed to maintain the Active

Supply Air Temperature Setpoint Temperature.

If the Supply Air Temperature rises above the Active Supply Air Temperature Setpoint, the Digital Compressor signal will modulate as needed up to 100%. When the Digital Compressor signal reaches 100% the

Cooling Stage Up Delay begins. If the Digital Compressor signal remains at 100% and the Cooling Stage Up Delay expires, an additional

Fixed Capacity Compressor will activate if equipped.

If the Supply Air Temperature falls below the Active Supply Air Temperature Setpoint, the Digital Compressor signal will modulate as needed down to 0%. When the Digital Compressor signal reaches 0% the Cooling Stage Down Delay begins. If the Digital Compressor signal remains at 0% and the Cooling Stage Down Delay expires, the Digital Compressor, or a Fixed Capacity Compressor will be deactivated. The Digital Compressor is always the last compressor to be deactivated.

Economizer Operation

This section assumes you have configured your HVAC unit to control the Outdoor Air Dampers in an Economizer Mode of operation.

Modulating Cooling

The Modulating Cooling Proportional Window is used to determine the signal to the Modulating Cooling Source and is user adjustable.

The Modulating Cooling signal is calculated based on the differential between the Supply Air Temperature and the Active Supply Air Temperature Setpoint based on the Modulating Cooling Proportional Window. The Maximum Signal Adjustment per Time Period is 10% and is not user adjustable. The Minimum Signal Adjustment per Time Period is based on the Modulating Cooling Proportional Window. The larger the Modulating Cooling Proportional Window, the smaller the signal adjustment will be per Time Period. The Time Period is the delay between another increase or decrease in the Modulating Cooling Source

Signal and is user adjustable. For example, if the Modulating Cooling

Proportional Window is 5

F, the signal would be adjusted 2% per

F each Time Period above or below the Active Supply Air Temperature

Setpoint. When the Supply Air Temperature is above or below the

Active Supply Air Temperature Setpoint by 5

F or more, the signal would adjust 10% each Time Period.

The VCM can control one of two Modulating Cooling sources, such as a Chilled Water Valve or a Digital Compressor. Whichever source is used, the VCM will control the Modulating Cooling source to maintain the Active Supply Air Temperature Setpoint.

The Economizer is used as the first stage of Cooling if the Outdoor Air or Wetbulb Temperature is below the Economizer Enable Setpoint. For

Wetbulb control of the Economizer, an Outdoor Air Humidity Sensor must be installed. If the unit is equipped with a Return Air Temperature

Sensor, the Outdoor Air or Wetbulb temperature must be at least 5°F colder than the Return Air Temperature to allow the Economizer to modulate. The same is true if the unit is only equipped with a Space Temperature Sensor. By using the Return Air and/or Space Temperature reference, it allows the VCM to calculate whether the Outdoor Air Temperature will assist in Free Cooling.

The VCM Controller can monitor an Outdoor Air Humidity Sensor and combine that reading with the Outdoor Air Temperature reading to calculate a Wetbulb Temperature. If this Wetbulb Temperature is not available, just the Outdoor Air Temperature will be used. Whichever temperature is available, it must be below the Economizer Enable Setpoint by 1°F to enable the Economizer during the Cooling Mode of operation. When the temperature rises 1°F above the Economizer Enable

Setpoint, the Economizer will be disabled and return to Minimum Position.

38

VCM Controller

Technical Guide

As soon as the Cooling Mode is started, the Economizer will calculate a starting damper position based on the Outdoor Air Temperature and the differential between the Supply Air Temperature and the Active

Supply Air Temperature Setpoint. After it moves to this initial Setpoint, further adjustments will be made in small increments to fine tune the damper position to maintain the Active Supply Air Temperature Setpoint.

If the Economizer reaches 100% open and the Supply Air Temperature is still too warm, the Mechanical Cooling will be enabled to operate to provide additional stages of Cooling. Once a Mechanical Cooling Stage has been activated, the Economizer will remain full open until the Mechanical Cooling Stages are off or the Outdoor Air Temperature or

Wetbulb Temperature causes the Economizer to be disabled.

For DX Cooling Stages, the VCM activates the Cooling Stages based on the actual Evaporator Coil Temperature compared to the Evaporator

Coil Temperature Setpoint. The Evaporator Coil Temperature is calculated by using the Suction Pressure Sensor and converting the pressure to temperature. For Digital Compressor units, the VCM will modulate the Digital Compressor to maintain the Evaporator Coil Temperature

Setpoint and activate Fixed Capacity Compressors as necessary.

For Chilled Water units the VCM opens the Chilled Water Valve to a fixed 100% position to provide full moisture removal capabilities.

If the Economizer is not enabled to provide Cooling during the Occupied Mode, it will still maintain the Minimum Position programmed by the user to provide minimum fresh air into the building. During the

Unoccupied Mode, the Economizer will be closed. If during the Unoccupied Mode there is a call for Cooling and the Economizer is enabled by Outdoor Air Drybulb or Wetbulb temperature, it will modulate between full closed and full open to provide Free Cooling.

If you configured your VCM Controller for Dehumidification control, you need to install a Humidity Sensor on the optional Analog Input

Expansion Board. If the VCM is configured as a MUA unit, use an

Outdoor Air Humidity Sensor. If the VCM is configured as a VAV or

CAV unit, use an Indoor Air Humidity Sensor such as a Wall Mounted or Duct Mounted Sensor. If the VCM is to be used for Dual Damper

Modes during Occupied hours, use both Indoor and Outdoor Air Humidity Sensors. As an example this could be used in a kitchen application when you have a CAV unit using both Outdoor Air and Return Air.

This unit could be configured to operate using Return Air when the

Exhaust Hood is off or 100% Outdoor Air when the Exhaust Hood is on.

The Supply Air Temperature must be above the Supply Air Temperature Setpoint before the Mechanical Cooling can be activated.

Dehumidification Mode

During the Dehumidification Mode the VCM activates Cooling to extract moisture from the Supply Air and utilizes either Modulating Hot

Gas Reheat, On/Off Hot Gas Reheat or Heating to warm the Supply Air before entering the building. Hot Gas Reheat is the standard form of

Reheat. The HVAC unit’s Heat Source or a Heat Source located in the

Supply Air Duct can be used for Reheat if the unit is not equipped with

Hot Gas Reheat. Please see the warning note that follows regarding applications operating Heating and Cooling simultaneously

If the unit is equipped with a Modulating Hot Gas Reheat board

(MHGRV II), it is automatically detected by the VCM controller. In

Dehumidification Mode, as the Cooling causes the Supply Air Temperature to drop, the MHGRV II will bypass Hot Gas to the Hot Gas

Reheat Coil, raising the Supply Air Temperature back up to the Active

Supply Air Temperature Setpoint.

If the unit is equipped with an On/Off Hot Gas Valve, then one of the relays will be configured for Reheat. The Reheat Relay will be activated if the Supply Air Temperature is less than the HVAC Mode Enable Heating Setpoint. The Hot Gas Reheat Relay will remain on during the Dehumidification Mode regardless of the Supply Air Temperature. This is to insure a steady Supply Air Temperature.

Warning: Simultaneous Heating and Cooling cannot be approved unless the HVAC unit has been specifically designed for this purpose. A Special

Price Authorization (SPA) must be obtained from the AAON

factory for these applications to avoid warranty and/or rating problems. WattMaster

Controls Inc. assumes no liability for any

Simultaneous Heating and Cooling application if a

SPA is not obtained from the AAON

Factory at the time the HVAC unit is ordered.

On 100% Outdoor Air applications the Outdoor Air Dewpoint initiates the Dehumidification Mode when the Outdoor Air Dewpoint rises above the Outdoor Air Dewpoint Setpoint during the occupied Mode of operation. The Outdoor Air Dewpoint is calculated by using an Outdoor

Air Temperature Sensor and an Outdoor Air Humidity Sensor.

On VAV or CAV applications the Indoor Air Humidity initiates Dehumidification when the Indoor Air Humidity rises above the Indoor Air

Humidity Setpoint during the occupied Mode of operation.

When Heating is used for Reheat instead of Hot Gas Reheat, the VCM can activate the Heat Source(s) discussed in the Heating Mode section.

Heating can also be used in conjunction with Hot Gas Reheat to add additional Reheat for applications that require a higher Supply Air

Drybulb Temperature than what Hot Gas Reheat can provide. When

Heating is used in conjunction with Reheat, the VCM restricts the Heating to one form of Modulating Heat, or one stage of Gas or Electric

Heat.

The Dehumidification Mode can be configured to have Dehumidification Priority. If configured, the VCM will enter the Dehumidification

Mode when the Dewpoint or Humidity is above the Setpoint regardless of the current Heating or Cooling demands. The Reheat is always controlled to the Active Supply Air Temperature Setpoint. The Active Supply Air Temperature Setpoint will change during Heating, Cooling or

Vent Modes. During the Vent Mode, the Supply Air Temperature Setpoint will be a Calculated Setpoint that is halfway between the HVAC Mode

Setpoints.

Note: MODGAS II cannot be used in conjunction with Hot

Gas Reheat to add additional Reheat.

VCM Controller

39

Technical Guide

Sequence Of Operations

If Dehumidification Priority has not been configured, the VCM will only enter the Dehumidification Mode and use Reheat during the Vent

Mode. The Reheat will be controlled to a Calculated Supply Air Temperature Setpoint that is halfway between the HVAC Mode Setpoints.

Night Dehumidification can also be configured and is used primarily for CAV units that require an Unoccupied Mode of Dehumidification.

Night Dehumidification is only activated when the Indoor Air Humidity is above the Indoor Air Humidity Setpoint during the Unoccupied

Mode.

Remote Forced Dehumidification

Dehumidifcation Mode is normally controlled by using a Humidity Sensor connected to the (4) Analog Input (1) Analog Output Expansion

Board input AIN1 or AIN2. If desired Dehumidification Mode can also be determined by using a remote BAS or other user supplied remote device. The VCM controller will check Binary Input Expansion Board

#2 for a 24 VAC signal on BIN4. If the signal is present it will force the

VCM controller into Dehumidifcation Mode regardless of the mode it is currently operating in if Dehumidification Priority Mode has been configured. If Dehumidification Priority Mode has not been configured, the unit will only be forced into Dehumidification Mode if it is operating in the Vent Mode during the time the remote signal is being supplied to input BIN4.

Note: When using the Remote Forced Dehumidification function the user must set the Dehumidification Spt

Indoor RH to 100% for the Remote Forced

Dehumidification feature to function.

Return Air Bypass Damper Control

The return air bypass (RAB) damper is only used on constant air volume units with space temperature configured as the HVAC Mode Enable sensor. The RAB damper is only active during the dehumidification mode and is used as the first form of reheat. If the HVAC unit is equipped with modulating hot gas reheat, the RAB damper needs to be at 100% before the modulating hot gas reheat can be used. The RAB damper modulates from 0-100% as the space temperature falls below the cooling setpoint. When the space temperature is equal to the cooling setpoint, the RAB damper will be at 0%. When the space temperature falls to halfway between the cooling and heating setpoints, the RAB damper will be at 100%.

If the HVAC unit is equipped with separate actuators for the outdoor air and return air dampers, the return air damper will proportionally close more as the RAB damper opens. The rate at which the return air damper closes is user adjustable. The purpose of closing the return air damper more as the RAB Damper opens, is to allow more air to bypass the evaporator coil through the RAB Damper. If you want more air to pass through the RAB Bypass Damper, enter a larger number in the Return

Air Damper Factor setpoint. If you want less air to pass through the

RAB Damper, enter a smaller number in the Return Air Damper Factor setpoint.

Heating Mode Operation

Occupied Heating Mode occurs whenever the HVAC Mode Enable

Temperature is below the HVAC Mode Enable Heating Setpoint. Unoccupied Heating Mode only occurs if a Space Temperature Sensor is connected to the VCM or a broadcast of Space Temperature is being received from an Averaging Broadcast Controller.

The Mechanical Heating will be disabled if the Outdoor Air Temperature is above the Heating Lockout Setpoint by 1°F. This gives a 2°F hysteresis around the Heating Lockout Setpoint to prevent unwanted cycling in and out of Mechanical Heating Mode. If the Outdoor Air

Temperature disables the Mechanical Heating while it is currently operating, the Mechanical Heating will stage off if all staging and run times are satisfied.

No matter which Sensor is configured for the HVAC Mode Enable or if the Remote BAS sets the Mode through Remote Forced Heating, the

Supply Air Temperature is always controlled to the Active Supply Air

Temperature Setpoint while in Heating Mode.

Stage Control Window

The Heating Stage Control Window Setpoint determines when the

Heating Stages begin to stage up and stage down. In the Heating Mode, as the Supply Air Temperature falls below the Active Supply Air Temperature Setpoint, the Heating Stages will begin to stage on based on the Heating Stage Up Delay. The Heating Stages will continue to run until the Supply Air Temperature rises above the Active Supply Air

Temperature Setpoint plus the Heating Stage Control Window. For example if the Supply Air Temperature Setpoint is 140°F and the Heating Stage Control Window is 5

F, as the Supply Air Temperature rises above 145

F, the Heating Stages will begin to stage off based on the

Heating Stage Down Delay.

Heating Staging Delay

Minimum Off Time

A Heating Stage cannot be activated unless it has been off for this amount of time.

Minimum Run Time

After a Heating Stage has been activated, it must remain on for this amount of time.

Staging Up Delay

After the first Heating Stage has been activated, this delay prevents additional stages from activating too quickly before they are needed to achieve the Active Supply Air Temperature

Setpoint.

Staging Down Delay

After a Heating Stage has met its Minimum Run Time and is not needed, this delay prevents additional stages from deactivating too quickly in case they are needed to maintain the Active

Supply Air Temperature Setpoint.

40

VCM Controller

Technical Guide

MODGAS II Controller

The MODGAS II Controller is treated as a single stage of gas Heating when connected to the VCM’s expansion port. The Supply Air Temperature is broadcast from the MODGAS II Controller to the VCM.

The Supply Air Temperature Setpoint is broadcast from the VCM to the

MODGAS II Controller. When the VCM enters the Heating Mode, it broadcasts a command to activate the MODGAS II Controller. The

MODGAS II Controller modulates the Natural Gas Valve to maintain the Supply Air Temperature Setpoint. See the MODGAS II Controller

Technical Guide for detailed operation information of the MODGAS II

Controller.

lating Heating Proportional Window. The larger the Modulating Heating Proportional Window, the smaller the signal adjustment will be per

Time Period. The Time Period is the delay between another increase or decrease in the Modulating Heating source signal and is user adjustable. For example, if the Modulating Heating Proportional Window is

5°F, the signal would be adjusted 2% per °F each Time Period above or below the Active Supply Air Temperature Setpoint. When the Supply

Air Temperature is above or below the Active Supply Air Temperature

Setpoint by 5°F or more, the signal would adjust 10% each Time Period.

MODGAS II Controller with Additional Stages of Heat

The VCM can activate the MODGAS II Controller and additional stages of heating if needed. If this configuration is needed, a heating relay must be configured on the VCM for the MODGAS II Controller, but it will not be connected to anything. The MODGAS II Controller will always be the first stage of heating in this configuration. Additional heating relays can be configured and connected to Staged Heating sources, such as Natural Gas or Electric Heat. In order for the additional stages to activate, the MODGAS II Controller must be at 100% and then the Stage Up Delay begins. Once the Stage Up Delay expires and the Gas Valve is still at 100%, another Fixed Stage of Heating will activate. This will be the VCM’s second stage of heat. The MODGAS

II Controller will modulate to achieve the Active Supply Air Temperature Setpoint. If the MODGAS II Controller modulates to 0% and the

Supply Air Temperature is above the Active Supply Air Setpoint plus the Heating Stage Control Window, the Stage Down Delay begins. Once the Stage Down Delay expires and the Supply Air Temperature has remained above the Active Supply Air Setpoint plus the Heating Stage

Control Window, the Fixed Stage of Heating will be deactivated. The

MODGAS II will remain active, even at the minimum valve position unless the Supply Air Temperature remains above the Active Supply

Air Setpoint plus the Heating Stage Control Window. The MODGAS II controller will be the last stage of heating to be deactivated.

Modulating Heating

The VCM supports various forms of Modulating Heat such as SCR

Electric Heat, Modulating Hot Water Heat and Modulating Steam Heat.

Whichever form of Modulating Heating is used, the VCM will modulate the Heat Source to achieve the Active Supply Air Temperature

Setpoint. Modulating Natural Gas is a form of Modulating Heat, but is controlled by the MODGAS II Controller. The VCM only activates the

MODGAS II as a stage of heat, therefore, the Modulating Heating Proportional Window does not apply when the VCM is connected to the

MODGAS II Controller and is the only form of Heating activated by the VCM.

The Modulating Heating Proportional Window is used to determine the signal to the Modulating Heating Source and is user adjustable. The

Modulating Heating Signal is calculated by the differential between the

Supply Air Temperature and the Active Supply Air Temperature Setpoint based on the Modulating Heating Proportional Window. The maximum signal adjustment per Time Period is 10% and is not user adjustable.

The minimum signal adjustment per Time Period is based on the Modu-

The VCM can activate two forms of Heating that are classified as Primary and Secondary Heat Sources. The Primary Heat Source used can be SCR Electric Heat, Modulating Hot Water Heat or Modulating Steam

Heat. The Secondary Heat Source used can be Modulating Natural Gas

(MODGAS II Controller), Staged Gas Heat or Staged Electric Heat.

Primary Modulating Heat and

Secondary Heat with MODGAS II Controller

The Modulating Heating Proportional Window is used to determine the signal to the Primary Heat Source and is user adjustable. The Heating

Stage Control Window is used to determine stage up and stage down of the Secondary Heat Source. In the Heating Mode, the Primary Heat

Source will modulate to achieve the Active Supply Air Temperature

Setpoint. When the Primary Heat Source reaches 100%, the Heating

Stage Up Delay begins. If the Primary Heat Source is still at 100% after the Heating Stage Up Delay expires, the Secondary Heat Source will activate, which is controlled by the MODGAS II Controller. The Primary Heat Source will then be forced to 0%, allowing the MODGAS II

Controller to modulate the gas valve to achieve the Active Supply Air

Temperature Setpoint. When the Secondary Heat Source reaches 100%, the Heating Stage Up Delay begins. If the Secondary Heat Source is still at 100% after the Heating Stage Up Delay expires, the Primary

Heat Source will be forced to 100%. The Primary Heat Source will remain at 100% to allow the Secondary Heat Source to modulate to achieve the Active Supply Air Temperature Setpoint. If the Supply Air

Temperature rises above the Active Supply Air Temperature Setpoint plus the Heating Stage Control Window, the Heating Stage Down Delay begins. If the Supply Air Temperature is still above the Active Supply Air Temperature Setpoint plus the Heating Stage Control Window and the Heating Stage Down Delay expires, the Primary Heat Source will forced to 0%. If the Secondary Heat Source modulates to 0%, the

Heating Stage Down Delay begins. If the Secondary Heat Source remains at 0% and the Heating Stage Down Delay expires, the Secondary

Heat Source will be deactivated, and the Primary Heat Source will modulate to achieve the Active Supply Air Temperature Setpoint. If the

Supply Air Temperature rises above the Active Supply Air Temperature

Setpoint plus the Heating Stage Control Window, the Primary Heat

Source modulates as needed to allow the Supply Air Temperature to cool off.

VCM Controller

41

Technical Guide

Sequence Of Operations

Primary Modulating Heat and Secondary Heat with

Staged Gas or Electric Heat

The Modulating Heating Proportional Window is used to determine the signal to the Primary Heat Source and is user adjustable. The Heating

Stage Control Window is used to determine stage up and stage down of the Secondary Heat Source. In the Heating Mode, the Primary Heat

Source will modulate to achieve the Active Supply Air Temperature

Setpoint. When the Primary Heat Source reaches 100%, the Heating

Stage Up Delay begins. If the Primary Heat Source is still at 100% after the Heating Stage Up Delay expires, the Secondary Heat Source will activate. The Primary Heat Source will then modulate to achieve the

Active Supply Air Temperature Setpoint. If the Secondary Heat Source is activated and the Primary Heat Source has modulated to 0%, the

Heating Stage Down Delay will begin. If the Primary Heat Source is still at 0% after the Heating Stage Down Delay expires, the Secondary

Heat Source will deactivate. If the Supply Air Temperature rises above the Active Supply Air Temperature Setpoint plus the Heating Stage

Control Window, the Primary Heat Source modulates to 0% to allow the Supply Air Temperature to cool off.

on both BIN1 and BIN2, the VCM will be in Remote Forced Venting

Mode. Remote Forced Venting Mode is considered to be Occupied Fan

Only operation. Once the Remote Forced Mode has been set, normal

Heating, Cooling or Venting Modes of operations will occur. All other user adjustable setpoints, such as the Heating and Cooling Supply Air

Temperature Setpoints are used in the actual control of the equipment.

During Dehumidification, if a Reset Source is not configured, the Supply Air Temperature Setpoint will be 70°F.

The Remote Occupied Input on the Binary Input Expansion Board #1,

BIN4 can also be used for Occupied Fan Only operation when the Remote Forced Heating or Cooling inputs are not activated.

Warm-up Mode Operation

When the VCM Controller switches to the Occupied Mode of Operation (Not Override Mode), the unit compares the Return Air Temperature to a Morning Warm-up Target Temperature. If the Return Air Temperature is below this Setpoint, the Warm-up Mode is initiated. This

Mode remains in effect until the Return Air Temperature rises above the Target Temperature or a user adjustable Time Period expires. Warmup Mode is not initiated by Push Button Overrides or Unoccupied Heating demands.

Supply Air Temperature

Setpoint Reset

The VCM incorporates a new automatic Supply Air Temperature Reset capability. During reset, the Supply Air Temperature Setpoints are always being calculated based on the Heating and Cooling demands of the reset source. Since the Supply Air Temperature Setpoints are not fixed during reset, we refer to them as the “Active Supply Air Temperature Setpoints”.

The Supply Air Temperature Setpoints can automatically be reset by configuring the Space Temperature or Return Air Temperature as the

SAT/Reset Source. The Supply Air Temperature Setpoints can also be reset by configuring the Fan VFD Signal or Remote SAT Reset as the

SAT Reset Source. The Fan VFD Signal and Remote SAT Reset options are not fully automatic and require the user to enter a Low and a

High Temperature Reset setpoint for both Heating and Cooling.

Once the Warm-up Mode has been terminated, it cannot resume until the unit has been through a subsequent Unoccupied Mode. Only one

Warm-up Mode is allowed per Occupied cycle.

If you have stand alone VAV boxes that need to be forced wide open during the Warm-up Mode, you can configure one of the relay outputs to be used during this Mode. If the Warm-up Mode is active, the relay is activated. This relay then becomes the Force Open Command for all

VAV boxes to which it is wired.

Off Mode

If the schedule has set the Unoccupied Mode and no Heating, Cooling or Dehumidification demands exist, the VCM Controller enters the Off

Mode. During the Off Mode the Supply Fan is off and the Outdoor Air

Dampers are closed.

Remote Control of HVAC Mode

If Space Temperature or Return Air Temperature is configured as the

SAT/Reset Source, the user will need to enter the desired Heating and

Cooling Setpoints for the SAT/Reset Source. The VCM uses the HVAC

Mode Enable Setpoints to determine the mode of operation. Once the

HVAC Mode has been determined, the VCM calculates the Active Supply Air Temperature Setpoint based on the SAT/Reset Source Temperature in relation to the SAT/Reset Source Heating and Cooling Setpoints.

During the Dehumidification Priority Mode, the Active Supply Air Temperature Setpoint is calculated in the same way as the Heating or Cooling Modes. When the VCM is in the Venting Mode, the Supply Air

Temperature Setpoint will be calculated to be halfway between the

HVAC Mode Enable Setpoints. When the VCM is in Dehumidification

Priority and the HVAC Mode is the Vent Mode, the Supply Air Temperature Setpoint reset range will be + or - 10° F, above and below the calculated Vent Mode, Supply Air Temperature Setpoint.

Note: When using the Remote Control Of HVAC Mode both of the Heating and Cooling HVAC Mode Enable

Setpoints must be set to zero.

The Heating Mode, Cooling Mode and Vent Mode can be determined by a remote Building Automation System (BAS). The VCM will check the Binary Input Expansion Board #2 for a 24 VAC input signal on

BIN1 and BIN2. BIN1 is used for Remote Forced Heating Mode. BIN2 is used for Remote Forced Cooling Mode. If a 24 VAC signal is present

If the Fan VFD Signal is configured as the SAT/Reset Source, the SAT/

Reset Source Setpoints and Remote SAT Reset Setpoints create the range of Supply Air Temperature Reset from 0% to 100% Supply Fan VFD

Signal. When the Supply Fan VFD signal is at 0%, the SAT/Reset Source heating setpoint will be the lowest Supply Air Temperature setpoint for heating. When the Fan VFD signal is at 100% , the Remote SAT Reset heating setpoint will be the highest Supply Air Temperature setpoint for heating. When the supply fan VFD signal is at 0%, the Remote SAT

Reset cooling setpoint will be the highest Supply Air Temperature

42

VCM Controller

Technical Guide setpoint for cooling. When the supply fan VFD signal is at 100%, the

SAT/Reset Source cooling setpoint will the lowest Supply Air Temperature setpoint for cooling. During the dehumidification priority mode, the Active Supply Air Setpoint is calculated in the same way as the

Heating or Cooling Modes. When the VCM is in the Vent Mode, the

Supply Air Temperature Setpoint will be calculated to be halfway between the HVAC Mode Enable Setpoints.

Since the Duct Static Pressure Control Output Signal is a nonconfigurable Direct Acting Signal (0-10 VDC), when you are using a

Zoning Bypass Damper Actuator to control the Duct Static Pressure you must set up the Zoning Bypass Damper Actuator or the Zoning

Bypass Damper so that it is Reverse Acting in operation. The Output

Signal increases (closes Zoning Bypass Damper) if the Duct Static Pressure is below the Duct Static Pressure Setpoint by the Deadband amount and the Output Signal decreases (opens Zoning Bypass Damper) if the

Static Pressure is above the Setpoint by the Deadband amount.

If Remote SAT Reset is configured as the SAT/Reset Source, the SAT/

Reset Source Setpoints will be the lowest Supply Air Temperature

Setpoints for both Heating and Cooling when the Remote SAT Reset

Input is at 0 VDC. When the Remote SAT Reset Input is at 5 VDC, the

Remote SAT Reset Setpoints will be the highest Supply Air Temperature Setpoints for both Heating and Cooling. The supply air setpoint will proportional between the SAT/Reset Source Setpoints at 0 VDC and the Remote SAT Reset Setpoints at 5 VDC. During the Dehumidification Priority Mode, the Supply Air Temperature Setpoints will be the same as the Heating and Cooling Modes. When the VCM is in the

Vent Mode, the Supply Air Temperature Setpoint will be calculated to be halfway between the HVAC Mode Enable Setpoints.

Supply Fan Control

Anytime the Supply Fan is requested to start, a timer is checked to make sure the Supply Fan has been off for at least 1 minute. This 1 minute delay is to protect against rapid cycling of the Supply Fan. Once the 1 minute delay has been satisfied, the Supply Fan relay is activated and all other outputs are verified to be in the off condition for a period of 1 to 2 minutes. This short period of Supply Fan only Operation serves to purge the stagnant air from the duct before any Heating or

Cooling occurs.

If the Static Pressure ever rises 0.5” above the Duct Static Pressure

Setpoint, the Duct Static Pressure Control Output Signal will be cut in half every control period until the Static Pressure is brought under control. This is to prevent damage to the ductwork if all the VAV boxes are closed or some other blockage occurs in the ductwork.

Warning: The manufacturer does not assume responsibility for protecting the equipment from over pressurization! The user should always install mechanical high static protection cutoffs to protect their system!

When the Supply Fans starts, the Duct Static Pressure Control Output

Signal will go to the Minimum % for Heating. Anytime the Supply Fan is off the Duct Static Pressure Control Output Signal will remain at zero volts.

Normally the Supply Fan runs continuously during the Occupied Mode of operation. If the fan is only required to run in the Occupied Mode during Heating, Cooling or Dehumidification Modes, the VCM can be configured for Fan Cycle Mode.

Duct Static Pressure Control

The VCM Controller reads and controls Static Pressure in the duct system if the Supply Fan has been configured for Duct Static Pressure

Control. Anytime the Supply Fan is operating, the VCM Controller is controlling Duct Static Pressure. The Duct Static Pressure Setpoint and

Deadband limits are user adjustable along with a Control Interval. This

Control Interval is the amount of time that elapses between each adjustment to the Duct Static Pressure Control Output Signal. The default period is 10 seconds and should not be changed unless close observation reveals that the Supply Fan is hunting and not maintaining a stable pressure reading. The Static Pressure Control Output Signal can be used to control a Supply Fan VFD (Direct Acting Operation) or a Zoning

Bypass Damper Actuator (Reverse Acting Operation).

The Duct Static Pressure Control Output Signal is a non-configurable

Direct Acting Signal (0-10 VDC). This Output Signal can be used to directly connect to a Supply Fan VFD. The Output Signal increases

(Increases VFD Speed) if the Duct Static Pressure is below the Duct

Static Pressure Setpoint by the Deadband amount and the Output Signal decreases (Decreases VFD Speed) if the Static Pressure is above the

Setpoint by the Deadband amount.

If the Supply Fan control is not configured for Duct Static Pressure

Control, you can still monitor the Duct Static Pressure if the Duct Static

Pressure Sensor is installed, however no control will occur.

Building Pressure Control

The VCM can maintain Building Static Pressure anytime the Supply

Fan is operating by activating a Constant Volume Exhaust Fan, a VFD

Exhaust Fan, Modulating Exhaust Damper or by modulating the Outdoor Air Damper. A Building Pressure Transducer must be connected to the VCM’s Analog Input Expansion Board. For Constant Volume Exhaust Fan applications, only an Exhaust Fan Relay needs to be configured for on/off operation of the Exhaust Fan. VFD or Modulating Building Pressure control must be configured in order to operate. An Exhaust Fan Relay can also be configured along with Modulating Building Pressure control for an Enable output. Building Pressure can be maintained by either Direct or Reverse Acting control.

Direct Acting

If configured, a VFD Exhaust Fan or Modulating Exhaust Damper will be controlled by varying a 0-10 or 2-10 VDC control signal on the analog output of the optional Analog Input Expansion Board. If an enable output is required, an Exhaust Fan Relay can also be configured.

The Exhaust Fan Relay and the Modulating Signal will activate when the Building Static Pressure rises above the Building Static Pressure

Setpoint plus the Deadband. The Exhaust Fan Relay will remain active until the Building Static Pressure falls below the Building Static Pressure Setpoint minus the Deadband and the Modulating Signal falls to

0%.

VCM Controller

43

Technical Guide

Sequence Of Operations

On/Off Control

If you do not require a Modulating Control Signal, you can also configure one of the Relay Outputs as an Exhaust Fan Relay to activate whenever the Building Static Pressure is above the Building Static Pressure

Setpoint plus the Deadband. The Exhaust Fan Relay will deactivate when the Building Static Pressure falls below the Building Static Pressure Setpoint minus the Deadband. Only one Relay Output should be configured for this operation. There is no staging of additional Exhaust

Fan Relays.

When the Outdoor Air Temperature is below the Cooling Lockout

Setpoint, no Mechanical Cooling can operate. However, if the unit is equipped with an Economizer and the VCM is configured to use the

Economizer, it can be used to provide free Cooling when the Mechanical Cooling is locked out. For Air to Air Heat Pumps the Cooling lockout also applies to Compressor Heating, which means it usually will be a lower setting than on Cooling units that are not Air to Air Heat Pumps.

Reverse Acting

If configured, on a drop in building static pressure below the building pressure setpoint minus the deadband, the AOUT 1 terminal on the

Analog Input Expansion Board will modulate the 2-10 VDC signal to open the outside air damper. When this option is selected, no economizer free cooling or IAQ operation will be available.

IAQ (CO

) Operation

If you have configured the VCM Controller to monitor and control CO

2 levels, the Economizer operation will be modified as follows:

The Outdoor Air Heating Lockout operates so that when the Outdoor

Air Temperature is above the Outdoor Air Heating Lockout Setpoints, no Mechanical Heating can operate. This applies to any type of Heating except Compressor Heating as used on Air to Air Heat Pumps. The lockout for Compressor Heating is explained in the previous paragraph regarding Cooling Lockout Setpoints.

Supply Air Cutoffs

The Supply Air Temperature Cutoffs are designed to prevent extremely

High and Low temperature Supply Air from entering the building.

High Supply Air Temperature Cutoff

High Supply Air Temperature Cutoff is initiated when the Supply Air

Temperature rises above the HI SAT Cutoff Setpoint. When this occurs, Heating stages will be deactivated until the Supply Air Temperature falls 5 °F below the HI SAT Cutoff Setpoint.

The Maximum Reset Position the Economizer can open to is determined by a user adjustable setpoint called the CO

Protection Limit Max. Level.

The Minimum Position the Economizer can close down to is Reset higher as the level of CO

increases above the CO

Protection Limit Max Level programmed by the user. As

2 the CO

level increases above the adjustable CO

Setpoint, the Outdoor Air Damper will start opening beyond its

Minimum Position. At the CO

Protection Limit Reset

Range above Setpoint, the Economizer will be held to its

Maximum Reset Position and not allowed to open any further.

Pre-heater Operation

In colder climates where freezing temperatures are sometimes experienced, it is desirable to preheat the Outdoor Air being drawn into the

HVAC unit before it reaches the Water Coils to prevent freezing. The

Pre-heater control option is available by setting a Low Ambient Protection Setpoint and by configuring one of the relay outputs as a Pre-Heater.

Only one relay can be configured for this option and therefore staging of Pre-heater relays is not available.

The Pre-heater sequence operates so that anytime the Outdoor Air Temperature is below the Low Ambient Protection Setpoint and the Supply

Fan is running, the Pre-heater Relay will activate. It will remain on until the Outdoor Air Temperature rises 1°F above the Setpoint or the

Supply Fan shuts down. If the Proof Of Flow option is installed and configured, its signal must also be active for the Pre-Heater Relay to activate. This output will operate during any HVAC Mode that exists.

Outdoor Air Lockouts

The Outdoor Air Cooling and Heating Lockouts Setpoints are designed to prevent unwanted Mechanical Heating or Cooling operation during certain Outdoor Ambient Temperature conditions.

Low Supply Air Temperature Cutoff

Low Supply Air Temperature Cutoff is initiated when the Supply Air

Temperature falls below the LO SAT Cutoff Setpoint. If the VCM is in

Economizer Operation, Vent Mode or Heating Mode and the Supply

Air Temperature falls below the LO SAT Cutoff Setpoint for 10 minutes, it is assumed a Mechanical Failure has occurred and all Heating will be deactivated, the Supply Air Fan will shut off and the Outdoor

Air Dampers will close. If the VCM is in the Cooling or Dehumidification Mode and the Supply Air Temperature falls below the LO SAT

Cutoff Setpoint, the Cooling Signal or Cooling Stages will immediately begin deactivating. To restore normal operation, one of the following three things must occur:

The Supply Air Temperature rises above the LO SAT

Cutoff Setpoint by 5 °F

The VCM goes from Occupied to Unoccupied or

Unoccupied to Occupied Mode.

The VCM’s power is cycled.

Scheduling

The VCM Controller has an internal power source for the Real Time

Clock (RTC) that allows the controller to keep the time and accurately control scheduling. It can also broadcast the time to the VAV/Zone Controllers if that option is configured.

The VCM Controller has an Internal 7 day Schedule with 2 Start/Stop

Events per day. You can also have 1 Holiday Schedule with 2 Start/Stop

Events per day. This Holiday Schedule can be used for 14 different

Holiday periods.

44

VCM Controller

Technical Guide

You can change the time on the VCM Controller through the Modular

Service Tool or the System Manager. You can also broadcast the time and date to all VCM controllers by using a Personal Computer and the

PRISM II Computer Front End Software.

The Internal Scheduling in the VCM Controller also includes a Self

Teaching Optimal Start Routine that can be activated by entering a value of 1.0 or greater for the Soak Multiplier Setpoint. The Optimal Start function can only be used if your VCM Controller has a Space Temperature Sensor installed and it is being used as the Controlling Sensor, or you are using WattMaster VAV/Zone controllers with the VCM controller. No adjustments other than the Soak Multiplier are required from the user because the VCM Controller monitors how long it takes to reach the Target Temperature each day and adjusts the Starting Time accordingly. That means the first day you operate your HVAC unit it will not be able to Optimally Start because it does not have a history of previous Starts and their results. After the first day, the VCM Controller will begin adjusting the Start Time, and after six Normally Scheduled

Starts have occurred, the Optimal Start Routine will have gathered enough data to provide an accurate Pre-start based on the learned conditions. This is an ongoing learning process of the six previous starts, so the unit automatically adjusts for the changing seasons. If you don’t need this feature but you are using the Space Temperature Sensor as the

Controlling Sensor, you can set the Soak Multiplier to zero to eliminate the Optimal Start Routines.

Internal Trend Logging

The VCM Controller continuously maintains an Internal Trend Log, which records a fixed set of values at an interval programmed by the user. These values can be retrieved only with the PRISM II Computer

Front End Software. If you do not have a computer with PRISM II

Software installed and connected to the system communications loop, you do not have access to these logs.

Outdoor Air Humidity

Indoor Air Humidity

Duct Static Pressure

Building Static Pressure

Economizer Signal Percentage

Supply Fan VFD/Zoning Bypass Damper Signal Percentage

Exhaust Fan VFD/Exhaust Damper Signal Percentage

Modulating Heat Signal Percentage

Modulating Cool Signal Percentage

On Board Relay Status (BIT Pattern )

Expansion Board Relay Status (BIT Pattern )

These items and values are explained in greater detail in the PRISM II

Computer Front End Software manual.

Force Modes or Overrides

The VCM Controller relay and analog outputs can be user overridden if the Modular Service Tool or the PRISM II Computer Front-end Program is used. The System Manager cannot be used for these Force

Modes. The Modes of operation for the relays are:

0 = Normal Operation

1 = Forced ON

2 = Forced OFF

The Analog Outputs are Forced if the user specifies a value between 0.0

and 10.0 VDC. To cancel the Force Mode, you must enter a value less than 0 such as -1.0 VDC.

There are 120 log positions available. Once the last (120th) position has been recorded, the log jumps back to the first position and begins overwriting the old data. This means the user is required to retrieve the logs at an interval that is shorter than the duration of the last 120 logs.

When the Analog Outputs are Forced, the display on the Modular Service Tool or Prism II program can be interpreted as the actual voltage.

During normal operation, the display indicates the percentage signal applied based on the user defined voltage limits. For example, if the user defines a 2.0 VDC to 10.0 VDC range, then 50% would be 6.0

VDC instead of the 5.0 VDC applied when the range is 0.0 VDC to

10.0 VDC.

Shown below are some log intervals and the duration of 120 logs.

1 Minute Interval = 2 Hours

12 Minute Interval = 24 Hours

15 Minute Interval = 30 Hours

30 Minute Interval = 60 Hours

60 Minute Interval = 120 Hours

The fixed items in the log are listed below:

As previously mentioned, Force Modes can only be activated when using either the Modular Service Tool or the PRISM II Computer Front

End Software. Furthermore, the Override condition can only remain in effect as long as one of these Operator Interface devices is connected and communicating with the VCM. That means that you cannot Force an Override condition and then walk away from the equipment with the

Override still active. The loss of communications, removal or shutdown of the Operator Interface will automatically terminate the Override within

10 minutes. This is to protect the equipment and to prevent an Override condition from remaining active indefinitely resulting in inefficient or dangerous operation of the equipment.

Date

Time

Space Temperature

Return Air Temperature

Outdoor Air Temperature

Active Cooling Setpoint

Active Heating Setpoint

Supply Air Temperature

Active Supply Air Temperature Setpoint

Warning: No equipment protection is available during the

Force Mode of operation. That means you could start a compressor without running the

Supply Fan or create other conditions that

WILL damage the equipment. WattMaster

Controls, Inc. assumes no responsibility or liability for the misuse of these user Overrides that cause damage to the equipment!

VCM Controller

45

Technical Guide

Sequence Of Operations

VAV/Zone Box Compatibility

The VCM Controller is designed to communicate with Orion VAV/Zone

Controllers. The VCM can be configured to broadcast its Internal Schedule, Time and Date, Fan and Heat Status and Supply Air Temperature.

The VCM can also broadcast Force to Max or Force to Fixed Position during Morning Warm-up. The Orion VAV/Zone Controllers broadcast

Push-Button Overrides from Unoccupied to Occupied. They can also generate Unoccupied Heating and Cooling calls to the VCM controller based on Setbacks.

If you are using another manufacturers VAV Box Controllers, the VCM

Controller can activate a relay to inform the VAV/Zone Controllers that the VCM controller is operating in Warm-up Mode. No other information can be passed between the VCM Controller and the other manufacturers VAV Box Controllers. This means that Overrides or Unoccupied

Heating and Cooling calls cannot activate the VCM Controller. If you need any of these capabilities you must use only Orion VAV/Zone controllers for controlling all your VAV Boxes.

VAV/Zone System

When the VCM goes into the Occupied Mode it initiates Morning Warmup if the Return Air Temperature is below the Morning Warm-up Target

Temperature Setpoint. During Morning Warm-up the VAV/Zone Controllers will modulate open if the Space Temperatures are too cold. They can also move to their Maximum Airflow or Fixed Airflow Position

Setpoint if they receive this broadcast from the VCM Controller. Once

Morning Warm-up has been satisfied, the VCM enters the Cooling Mode and the VAV/Zone Controllers will modulate to satisfy their Space Temperature Setpoints. If the Space Temperature falls below the Heating

Setpoint, staged or modulating Reheat can be activated to warm the space.

Communications between the VCM and the VAV/Zone Controllers are handled by the MiniLink Polling Device. Alarm Polling and Tenant

Overrides are also monitored by the MiniLink Polling Device. Tenant

Overrides are overrides generated by the Space Temperature Sensor’s push button. The MiniLink Polling Device records the start and stop times and total run times of the overrides on a daily and monthly basis.

A computer running Prism II Computer Front End Software is required to retrieve all data acquired by the MiniLink Polling Device.

Zoning System

The VCM Controller automatically configures itself for Voting Control when the MiniLink Polling Device is installed and is configured as a

Voting System. The VCM controller sets the HVAC Mode Enable to the Return Air Temperature Sensor as soon as communication is acquired with the MiniLink Polling Device. If the VAV/Zone controllers are configured for Voting, the MiniLink Polling Device totals the Heating and Cooling demands and determines which HVAC Mode the VCM should be in. The MiniLink Polling Device broadcasts a forced Heating, Cooling or Vent Mode of operation to the VCM. Once the VCM receives the broadcast to set the HVAC Mode, it operates as previously described in the VCM Sequence of Operations. If communications are lost, the VCM returns to its own control and will maintain the HVAC

Mode Enable Setpoints by using the Return Air Temperature Sensor as the Controlling Sensor.

46

VCM Controller

Technical Guide

Troubleshooting

Using LEDs To Verify Operation

The VCM controller is equipped with 4 LEDs that can be used as very powerful troubleshooting tools. See Figure 29 for the LED locations.

The LEDs and their uses are as follows:

“COMM”

This LED will light up to indicate system communications.

“PWR”

This LED will light up to indicate that 24 VAC power has been applied to the controller.

“LED1”

This is the diagnostic blink code LED. It will light up and blink out diagnostic codes. LED1 also represents the tens column in the address blink code.

If the address switch setting is correct and the COMM LED still does not behave as indicated above, check to be sure the operators interface is connected correctly. If you are using the System Manager Operators Interface it must be connected to VCM controller as shown in

Figure 31, or anywhere on the local communications loop. If you are using the Modular Service Tool, verify that it is plugged in securely to the DIN connection on the VCM controller. See Figure 31 for DIN connector location.

“LED2”

This is the diagnostic blink code LED. It will light up and blink out diagnostic codes. LED2 also represents the ones column in the address blink code.

If the COMM LED still does not behave correctly, check the voltages at the communications terminal block. Be sure the board is powered up for this test. Unplug the communications terminal block from the board and check the DC voltage between T and SHLD and between R and

SHLD. Check the voltage with a digital multimeter set to DC volts.

The voltage should be between 2.4 to 2.5 VDC between SHLD and either T or R. If your voltage is not in this range, you probably have a damaged driver chip that must be replaced.

PWR LED Operations

When the VCM Controller is powered up the “PWR” LED should light up and stay on continuously. If it does not light up, check to be sure that you have 24 VAC connected to the board, that the wiring connections are tight and that they are wired for the correct polarity. The 24 VAC power must be connected so that all ground wires remain common. If after making all these checks the PWR LED does not light up, please contact WattMaster technical support for assistance.

For driver chip replacement instructions, please see the Orion Controls

System Installation & Troubleshooting Guide for more information or contact the factory for further assistance.

OE331-21-VCM

Controller Board

COMM LED Operations

When power is applied to the controller, the “COMM” LED will also light up. If this is a Stand Alone System (one controller only on the loop) or an Interconnected System (several VCM controllers tied together without a CommLink) the COMM LED will glow continuously.

The COMM LED will flicker when you are connected to the VCM controller and you are entering setpoints with the Modular Service Tool or the System Manager. It will also flicker if this is a Networked System. If this is a Networked System (the system has a CommLink installed) the COMM LED should flicker rapidly indicating that the system is communicating. A “flicker” is defined as a brief moment when the LED turns off then back on. It may be easier to see this “flicker” if you cup your hand around the LED.

Communications Terminals

System Manager Can Be

Connected Here With Pigtail

Cable

(COMM) Communications LED

(PWR) Power LED

(LED1) Diagnostic LED

COMM

SHLD

COMM

PWR

LED1

LED2

DIN Connector

For Modular

Service Tool

If the COMM LED does not operate as indicated above, first check the address switch setting. Verify the address switch as outlined in the

Diagnostic LEDs Operations section. See Figure: 29 for complete address switch setting instructions.

Note: LED1 represents the tens column and LED2 represents the ones column of the board address. If the address of the board is set to 59 with the address switch, then

LED1 will blink 5 times and then LED2 will blink 9 times.

(LED2) Diagnostic LED

Figure 31: LED Locations & Service Connections

VCM Controller

47

Technical Guide

Appendix

Diagnostic LEDs Operation

When power is first applied, both LEDs will be off for (1) second. At this time both LEDs will blink to indicate the setting of the address switch and then extinguish for 5 seconds. Verify that the address switch setting is correct by counting the number of blinks.

Note: LED1 represents the tens column and LED2 represents the ones column of the board address. If the address of the board is set to 59 with the address switch, then

LED1 will blink 5 times and then LED2 will blink 9 times.

Blink Code Description

Normal Operation

Supply Air Sensor Failure

Outdoor Air Sensor Failure

Space Sensor Failure

Mechanical Cooling Failure

Mechanical Heating Failure

Fan Proving Failure

Dirty Filter Alarm

Smoke Alarm

Low Supply Temperature Alarm

High Supply Temperature Alarm

Control Temp. Cooling Failure

Control Temp. Heating Failure

Push Button Override

Zone Override

Force Outputs Override

LED #1

Number

Of Blinks

LED #2

Number

Of Blinks

If the address switch is not correct, remove the communication loop terminal plug from the controller and then the power terminal plug. Set the address dip switches correctly. See Figure 29 for correct address switch setting instructions. After you are sure the address switch setting is correct, reconnect the power connection and then the communication loop connection to the board.

Note: Power to the Controller being addressed must always be cycled after changing address switch settings in order for the changes to take effect.

Reapply power to the controller and observe the blink code to verify the address is set correctly. If the LEDs now blink the correct address your board is addressed correctly. If they don’t light up at all, the board is not operating correctly and could be defective. Once the board is done blinking the address then LED2 will blink continuously for 30 seconds while the board calibrates. Once the board is done calibrating the Diagnostic

LEDs will blink a code every 10 seconds to indicate board status. See

Table 2 for a list of the various blink codes and their meaning.

If all of these tests are made and the controller still doesn’t operate, please contact WattMaster Controls Technical Support group. You can reach WattMaster Controls Technical Support at 866-918-1100.

Table 2: LED Blink Code Interpretation

48

VCM Controller

Technical Guide

System Configuration Options

The VCM controller can be used as a Stand Alone System (One VCM

Controller Only), connected together on a Interconnected System (Multiple VCM controllers Only), or connected together on a Network System (Multiple VCM Controllers, VAV/Zone Controllers, or Add -on

Controllers) to form a complete Orion Controls System that can be programmed and monitored with one or more of the available Orion Operator Interfaces.

Interconnected System

The Interconnected system is used when you have multiple VCM controllers on your job. With this system you simply connect the controllers together using WattMaster communications wire or 18 gauge 2 conductor twisted pair with shield wire (Belden #82760 or equivalent). This allows for all controllers that are connected on the communications loop to be programmed and monitored from one or more of the available Operator Interfaces connected on the communications loop.

For detailed information about the various Orion Controls Systems that are available and their related wiring requirements and options, please see the Orion Systems Technical Guide.

Operator Interfaces

The Orion Operator Interfaces are designed to provide for programming and monitoring of VCM controller(s) and/or any VAV/Zone or

Add-on Controller(s) connected to your Orion System. The Operators

Interfaces available for use with the Orion Systems are:

•

Modular Service Tool

•

Modular System Manager

•

Tactio SI - Touch Screen Interface

•

Personal Computer with Prism II Computer Front End

Software Installed

You can use any one of these interfaces or all of them on the same Orion

System.

Stand Alone System

The Stand Alone system is used when you have a single VCM controller only. Programming and status monitoring are accomplished by selecting and installing one or more of the Operator Interfaces.

See Figure 33 for a Typical Interconnected System Layout diagram.

Networked System

If you have 1 to 59 VCM controllers that require information sharing , simply connect the controllers together using WattMaster communications wire or 18 gauge 2 conductor twisted pair with shield wire (Belden

#82760 or equivalent). The Networked Single Loop system requires that either a MiniLink PD communication interface or a CommLink communication interface or both are purchased and wired into the communications loop in a similar manner to the VCM controllers.

The Networked Multiple Loop system is used when you have more than 59 VCM controllers and/or are using multiple VCM controllers that are connected to VAV/Zone controllers. These groups of controllers are broken up into multiple “Local Loops” which connect to each other via the “Network Loop”. Each individual MiniLink PD handles its specific local loop’s communications requirements. The CommLink communications interface handles all the communications between the individual MiniLink PDs to form the network loop. Up to 60 local loops can connected together with this configuration. This provides the capability for over 3500 controllers to be networked together.

See Figure 34 for a Typical Networked System Layout diagram.

See Figure 32 for a Typical Stand Alone System Layout diagram.

VCM Controller

49

Appendix

Technical Guide

Tactio

Operator

Interfaces

Figure 32: Typical Stand Alone System Layout

50

VCM Controller

Technical Guide

Ta ct io

VCM Controller

51

Appendix

Technical Guide

52

Ta ctio

VCM Controller

Technical Guide

10 kOhm Type III Temperature Sensor

Testing

The following sensor voltage and resistance tables are provided to aid in checking sensors that appear to be operating incorrectly. Many system operating problems can be traced to incorrect sensor wiring. Be sure all sensors are wired per the wiring diagrams in this manual.

If the sensors still do not appear to be operating or reading correctly, check voltage and/or resistance to confirm that the sensor is operating correctly per the tables. Please follow the notes and instructions below each chart when checking sensors.

Temp

(

-10

-5

Temperature – Resistance – Voltage For Type III 10 K Ohm Thermistor Sensors

Resistance

(Ohms)

Voltage @

Input (VDC)

Temp

(

Resistance

(Ohms)

Voltage @

Input (VDC)

Temp

(

Resistance

(Ohms)

93333

80531

69822

60552

52500

45902

40147

35165

30805

27140

23874

21094

18655

17799

16956

16164

15385

4.620

4.550

4.474

4.390

4.297

4.200

4.095

3.982

3.862

3.737

3.605

3.470

3.330

3.275

3.217

3.160

3.100

14681

14014

13382

12758

12191

11906

11652

11379

11136

10878

10625

10398

10158

9711

9302

8893

8514

3.042

2.985

2.927

2.867

2.810

2.780

2.752

2.722

2.695

2.665

2.635

2.607

2.577

2.520

2.465

2.407

2.352

110

115

120

125

130

135

100

105

140

145

150

4923

4449

4030

3656

3317

3015

8153

7805

7472

6716

6047

5453

2743

2502

2288

Voltage @

Input (VDC)

2.297

2.242

2.187

2.055

1.927

1.805

1.687

1.575

1.469

1.369

1.274

1.185

1.101

1.024

0.952

Thermistor Sensor Testing Instructions

Use the resistance column to check the thermistor sensor while disconnected from the controllers (not powered).

nus) lead on GND terminal and the “+”(plus) lead on the sensor input terminal being investigated.

Use the voltage column to check sensors while connected to powered controllers. Read voltage with meter set on DC volts. Place the “-”(mi-

If the voltage is above 5.08 VDC, then the sensor or wiring is “open.”

If the voltage is less than 0.05 VDC, the sensor or wiring is shorted.

VCM Controller

53

Appendix

Technical Guide

OE265 RH Sensor Testing

The chart below is used to troubleshoot the OE265 Relative Humidity

Sensors.

Humidity

Percentage

(RH)

16%

18%

20%

22%

24%

10%

12%

14%

OE265 Relative Humidity Transmitters – Humidity vs. Voltage For 0-5 VDC Sensors

Voltage

Input

(VDC)

Humidity

Percentage

(RH)

Voltage

Input

(VDC)

Humidity

Percentage

(RH)

Voltage

Input

(VDC)

Humidity

Percentage

(RH)

0.80

0.90

1.00

1.10

1.20

0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

42%

44%

46%

48%

50%

26%

28%

30%

32%

34%

36%

38%

40%

2.10

2.20

2.30

2.40

2.50

1.30

1.40

1.50

1.60

1.70

1.80

1.90

2.00

68%

70%

72%

74%

76%

52%

54%

56%

58%

60%

62%

64%

66%

3.40

3.50

3.60

3.70

3.80

2.60

2.70

2.80

2.90

3.00

3.10

3.20

3.30

78%

80%

82%

84%

86%

88%

90%

92%

94%

96%

98%

100%

OE265-03 Relative Humidity Sensor

Testing Instructions:

Use the voltage column to check the Humidity Sensor while connected to a powered expansion board. Read voltage with meter set on DC volts.

Place the “-”(minus) lead on terminal labeled GND and the “+” lead on the AIN terminal that the Humidity sensor is connected to on the Analog Input/Output Expansion Board.

Voltage

Input

(VDC)

3.90

4.00

4.10

4.20

4.30

4.40

4.50

4.60

4.70

4.80

4.90

5.00

54

VCM Controller

Technical Guide

OE271 Pressure Sensor Testing

The table below is used to troubleshoot the OE271 Duct Static Pressure Sensors.

OE258 Pressure Sensor Testing

The table below is used to troubleshoot the OE258 Building Pressure

Sensors.

OE271 Duct Static Pressure Sensor

Pressure

Sensor

(“ W.C.)

0.90

1.00

1.10

1.20

1.30

1.40

1.50

1.60

1.70

1.80

1.90

2.00

0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

2.10

2.20

2.30

2.40

2.50

Voltage

Input

(VDC)

0.25

0.33

0.41

0.49

0.57

0.65

0.73

0.81

0.89

0.97

1.05

1.13

1.21

1.29

1.37

1.45

1.53

1.61

1.69

1.77

1.85

1.93

2.01

2.09

2.17

2.25

Pressure

Sensor

(“ W.C.)

2.60

2.70

2.80

2.90

3.00

3.10

3.20

3.30

3.40

3.50

3.60

3.70

3.80

3.90

4.00

4.10

4.20

4.30

4.40

4.50

4.60

4.70

4.80

4.90

5.00

Voltage

Input

(VDC)

3.05

3.13

3.21

3.29

3.37

3.45

3.53

3.61

3.69

3.77

3.85

3.93

2.33

2.41

2.49

2.57

2.65

2.73

2.81

2.89

2.97

4.01

4.09

4.17

4.25

OE271 Pressure Sensor Testing Instructions

Use the voltage column to check the Duct Static Pressure Sensor while connected to powered controllers. Read voltage with meter set on DC volts. Place the “-”(minus) lead on GND terminal and the “+”(plus) lead on the 0-5 pin terminal on (JP1) with the jumper removed. Be sure to replace the jumper after checking.

OE258 Building Pressure Sensor

Pressure

Sensor

(“ W.C.)

-0.16

-0.15

-0.14

-0.13

-0.12

-0.11

-0.10

-0.09

-0.08

-0.07

-0.06

-0.05

-0.25

-0.24

-0.23

-0.22

-0.21

-0.20

-0.19

-0.18

-0.17

-0.04

-0.03

-0.02

-0.01

0.00

Voltage

Input

(VDC)

0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0.90

1.00

1.10

1.20

1.30

1.40

1.50

1.60

1.70

1.80

1.90

2.00

2.10

2.20

2.30

2.40

2.50

Pressure

Sensor

(“ W.C.)

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.10

0.11

0.12

0.13

0.14

0.15

0.16

0.17

0.18

0.19

0.20

0.21

0.22

0.23

0.24

0.25

Voltage

Input

(VDC)

3.50

3.60

3.70

3.80

3.90

4.00

4.10

4.20

4.30

4.40

4.50

4.60

2.60

2.70

2.80

2.90

3.00

3.10

3.20

3.30

3.40

4.70

4.80

4.90

5.00

OE258 Building Pressure Sensor Testing Instructions

Use the voltage column to check the Building Static Pressure Sensor while connected to a powered expansion board. Read voltage with meter set on DC volts. Place the “-”(minus) lead on terminal labeled GND and the “+” lead on terminal AIN4 on the Analog Input/Output Expansion Board.

VCM Controller

55

Technical Guide

Appendix

OE275 Suction Pressure Transducer

Testing

The Evaporator Coil Temperature is calculated by converting the Suction Pressure to Temperature. The Suction Pressure is obtained by using the OE275 Suction Pressure Transducer which is connected into the

Suction Line of the Compressor. See the OE275 Suction Pressure Transducer, Pressure, Temperature and Voltage Chart. The chart shows a tem-

OE275 Suction Pressure Transducer

Coil Pressure – Temperature – Voltage Chart

52.52

53.70

54.89

56.25

57.61

58.98

60.34

61.70

63.06

43.03

44.21

45.40

46.59

47.77

48.96

50.14

51.33

64.42

65.78

67.14

68.51

70.06

71.61

73.16

74.71

76.26

77.82

79.37

80.92

82.47

84.02

1.34

1.36

1.38

1.40

1.43

1.45

1.47

1.49

1.51

1.19

1.21

1.23

1.25

1.27

1.29

1.31

1.32

1.53

1.56

1.58

1.60

1.63

1.65

1.68

1.70

1.73

1.75

1.77

1.80

1.82

1.85

OE275 Suction Pressure Transducer Testing

Use the voltage column to check the Suction Pressure Transducer while connected to the VCM Controller. The VCM Controller must be powered for this test. Read voltage with a meter set on DC volts. Place the negative lead from the meter on a ground (GND) terminal located on the VCM’s 12-pin terminal block. Place the positive lead from the meter on the AIN5 terminal located on the VCM’s 12-pin terminal block.

99.86

101.62

103.60

105.58

107.56

109.54

111.52

113.50

115.48

85.79

87.54

89.30

91.06

92.82

94.58

96.34

98.10

117.46

119.44

121.43

123.65

125.87

128.09

130.31

132.53

134.75

136.97

139.19

141.41

143.63

2.10

2.13

2.16

2.20

2.23

2.26

2.29

2.32

2.35

1.88

1.91

1.93

1.96

1.99

2.02

2.05

2.08

2.39

2.42

2.45

2.49

2.52

2.56

2.59

2.63

2.66

2.70

2.74

2.77

2.81

56

VCM Controller

Notes:

Technical Guide

VCM Controller

57

Notes:

Technical Guide

58

VCM Controller

Notes:

Technical Guide

VCM Controller

59

AAON, Inc.

Form: AA-VCM-TGD-01A Printed in the USA November 2005

WattMaster Controls Inc.

•

8500 NW River Park Drive

•

Parkville, Mo.

•

64152

Phone (816) 505-1100 www.orioncontrols.com

Fax (816) 505-1101

2425 So. Yukon Ave • Tulsa, OK 74107-2728

Ph: (918) 583-2266 • Fax: (918) 583-6094

AAON ® Part No. R38200

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