Trane Varitrac Dampers Installation And Maintenance Manual

Trane Air Conditioner Unit Control Module (UCM) 4.2 Retrofit VAV vav-svn03a-en

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Installation Manual

VariTrac™

Central Control Panel

June 2002 VAV-SVN03A-EN

VAV-SVN03A-EN

VariTrac Central Control Panel Installation Manual

This manual and the information in it are the property of American Standard

Inc. and shall not be used or reproduced in whole or in part, except as

intended, without the written permission of American Standard Inc. Since

Trane has a policy of continuous product improvement, it reserves the right

to change design and specification without notice.

Use of the software contained in this package is provided under a software

license agreement. Unauthorized use of the software or related materials

discussed in this manual can result in civil damages and criminal penalties.

The terms of this license are included with the compact disk. Please read

them thoroughly.

Trane has tested the system described in this manual. However, Trane does

not guarantee that the system contains no errors.

Trane reserves the right to revise this publication at any time and to make

changes to its content without obligation to notify any person of such

revision or change.

Trane may have patents or pending patent applications covering items in

this publication. By providing this document, Trane does not imply giving

license to these patents.

The following are trademarks or registered trademarks of Trane: Reliatel,

Tracker, Trane, VariTrac, VariTrane, and Voyager.

Printed in the U.S.A.

© 2002 American Standard Inc. All rights reserved.

VAV-SVN03A-EN i

Contents

About This Manual ............................................ 1

Contents .............................................................................................................. 1

Compliance Information .............................................................................. 1

Specifications ............................................................................................... 1

VariTrac Changeover Bypass System ......................................................... 1

Overview ................................................................................................ 1

Getting Started ...................................................................................... 1

Installing and Configuring the System ................................................ 1

Troubleshooting .................................................................................... 1

Delivered VAV System ................................................................................. 1

Overview ................................................................................................ 1

Getting Started ...................................................................................... 1

Installing and Configuring the System ................................................ 1

Naming Conventions ......................................................................................... 2

Cautionary Statements ...................................................................................... 2

Related Literature ............................................................................................... 2

FCC Information ............................................... 3

VariTrac and Delivered VAV Radio and Television Interference........................ 3

VariTrac Changeover-Bypass System ................ 5

Overview ............................................................................................................. 5

Central Control Panel ................................................................................... 5

Unit Control Module (UCM) ........................................................................ 5

VariTrac Damper ........................................................................................... 5

Communicating Sensor/Bypass Damper Control ...................................... 6

VariTrac Bypass Damper ....................................................................... 6

Communicating Sensor/Bypass Control .............................................. 6

Auxiliary Temperature Sensor ..................................................................... 6

Zone Temperature Sensors .......................................................................... 6

CO2 Sensor ................................................................................................... 7

Occupancy Sensor ....................................................................................... 7

Operator Display (optional) ......................................................................... 7

Service Model Number Description ........................................................... 7

Specifications................................................... 9

VariTrac Central Control Panel ........................................................................... 9

Operator Display .............................................................................................. 10

VAV-SVN03A-ENii

UCM Damper .................................................................................................... 10

Communicating Sensor/Bypass Control Assembly ........................................ 11

Relay Board Binary Outputs .............................................................................11

Wire Specifications ........................................................................................... 11

Getting Started ............................................... 13

Unpack and Inspect the Components ............................................................. 13

Mount the Wiring Base..................................................................................... 14

Mounting Requirements............................................................................ 14

Location ................................................................................................ 14

Operating Environment....................................................................... 14

Clearances ............................................................................................ 14

Secure Termination Module Wall ............................................................... 15

Secure Termination Module to Conduit Box............................................. 16

Install VariTrac CCP Relay Board ............................................................... 16

Wire AC Power .................................................................................................. 17

CCP Field Wiring ......................................................................................... 17

AC Power Wiring .................................................................................. 18

AC Power Checkout ............................................................................. 18

Binary Input Wiring .......................................................................................... 18

Priority Shutdown Input Wiring .......................................................... 18

Occupied/Unoccupied Input Wiring ................................................... 19

Output Wiring ................................................................................................... 19

Install the Bypass Dampers and Communicating

Sensor/Bypass Control Assembly ................................................................... 20

Install Bypass Dampers ............................................................................. 20

Bypass Damper Wiring .............................................................................. 21

Mount the Communicating Sensor/Bypass Control ................................ 21

Connect the Communicating Sensor/Bypass Control Wiring ................. 22

Install the VariTrac Dampers ............................................................................ 23

Connect UCM Wiring ................................................................................. 24

Set the UCM DIP Switches ........................................................................ 25

Slaved Dampers ............................................................................................... 26

Install the Zone Temperature Sensors ............................................................. 28

Location ...................................................................................................... 28

Mounting Standard and Digital Zone Temperature Sensors ................... 29

Wall Mount ........................................................................................... 29

Junction Box Mount ............................................................................ 29

Zone Temperature Sensor Wiring .............................................................. 30

Communication Link Wiring ............................................................................ 32

Mount Main Module .................................................................................. 36

Install Operator Display (optional) ............................................................ 37

Connecting Modem Devices ..................................................................... 38

VAV-SVN03A-EN iii

Connecting PC with VariTrac Software to CCP ......................................... 39

Installation Checklist...................................... 41

Shipment .................................................................................................... 41

Unit Location .............................................................................................. 41

AC Power Wiring ........................................................................................ 41

Communicating Sensor/Bypass Assembly .............................................. 41

Input Wiring ................................................................................................ 41

Output Wiring ............................................................................................. 41

VariTrac Dampers ....................................................................................... 42

Zone Temperature Sensors ........................................................................ 42

UCM Wiring ................................................................................................ 42

Communication Link Wiring ...................................................................... 42

System Start-Up and Checkout ...................... 43

Pre-power-Up Checkout ................................................................................... 43

Central Control Panel ................................................................................. 43

UCM ............................................................................................................ 43

Occupied Mode ................................................................................... 44

Unoccupied Mode ............................................................................... 44

Powering Down the System ...................................................................... 44

UCM LEDs .................................................................................................. 44

Green LED ............................................................................................ 45

Yellow LED ........................................................................................... 45

Tests and Troubleshooting .............................. 47

Displayed Failures ............................................................................................ 47

Static Sensor Calibration Failure ............................................................... 47

Discharge Air Temperature Sensor Failure ............................................... 47

Communication Failure ............................................................................. 47

Zone Sensor Failure ................................................................................... 48

Zone Setpoint Failure ................................................................................ 48

Auxiliary Sensor Failure ............................................................................ 48

Static Pressure Sensor Troubleshooting ................................................... 48

Zone, Auxiliary and System Temperature Sensor Checkout ................... 48

UCM Local Heat Checkout ......................................................................... 50

Central Control Panel Input/Output Test .......................................................... 50

Binary Input Tests ....................................................................................... 50

Communicating Sensor/Bypass Control Test ........................................... 50

Supply Air Temperature Input Test ...................................................... 50

Static Pressure Sensor Input Test ....................................................... 51

Binary Output Test ............................................................................... 51

System Troubleshooting .................................................................................. 51

VAV-SVN03A-ENiv

Delivered VAV System .................................... 53

Overview ........................................................................................................... 53

What is Delivered VAV? ............................................................................. 53

What Delivered VAV is Not ........................................................................ 53

Central Control Panel ................................................................................. 55

Unit Control Module (UCM) ...................................................................... 55

VariTrane VAV Terminal Units .................................................................... 55

VariTrane VAV Terminal Unit Types ............................................................ 55

Single Duct ........................................................................................... 55

Parallel Fan-Powered ........................................................................... 55

Series Fan-Powered ............................................................................. 55

Auxiliary Temperature Sensor ............................................................. 56

Zone Temperature Sensors ................................................................. 56

CO2 Sensor ........................................................................................... 56

Occupancy Sensor ............................................................................... 56

Operator Display.................................................................................. 56

Getting Started ............................................... 57

Installing the Central Control Panel................................................................. 57

Install VariTrane VAV Terminal Units ................................................................ 57

Connect UCM Wiring ................................................................................. 57

Set UCM DIP Switches ............................................................................... 57

Installing Zone Temperature Sensors ....................................................... 57

Communications Link Wiring .................................................................... 57

Installation Checklist...................................... 63

Shipment .................................................................................................... 63

Unit Location .............................................................................................. 63

AC Power Wiring ........................................................................................ 63

Input Wiring ................................................................................................ 63

VariTrane Terminal Units ............................................................................ 63

Zone Temperature Sensors ........................................................................ 63

UCM Wiring ................................................................................................ 63

Communication Link Wiring ...................................................................... 64

Completing Central Control Panel Assembly ................................................. 64

Mount Main Module .................................................................................. 64

Install Operator Display ............................................................................. 64

Connecting Modem Devices ..................................................................... 64

VAV-SVN03A-EN 1

About This Manual

Contents

This manual describes the steps required to install and configure VariTrac™

Changeover Bypass Zoning and Delivered VAV Systems. Sections in this

manual are highlighted below:

Compliance Information

Information about FCC approval and possible radio and telephone interfer-

ence, and the CE compliance statement.

Specifications

Technical specifications for VariTrac Central Control Panel unit and system

components.

VariTrac Changeover Bypass System

Overview

A brief description of a typical VariTrac changeover bypass system.

Getting Started

Pre-installation and setup information.

Installing and Configuring the System

Installation and configuration information, including an installation check-

list.

Troubleshooting

General troubleshooting guidelines for common problems.

Delivered VAV System

Overview

A brief description of a typical delivered VAV system.

Getting Started

Pre-installation and setup information.

Installing and Configuring the System

Installation and configuration information, including an installation check-

list.

VAV-SVN03A-EN2

Naming Conventions

The following is a list of naming conventions used in this manual:

•CCP: Refers to the system Central Control Panel

•VariTrac: Refers to the CCP used in a pressure dependent bypass zoning

system

•Delivered VAV: Refers to the CCP used with a Commercial Voyager VAV

rooftop unit and VariTrane pressure independent VAV boxes

•VAV: Variable air volume

Cautionary Statements

The following cautionary statements signal procedures or conditions that

require particular attention.

WARNING

Indicates a potentially hazardous situation, which, if not avoided, could

result in serious injury or death.

CAUTION

Indicates a potentially hazardous situation, which, if not avoided, may

result in minor or moderate injury.

CAUTION

Indicates a situation in which property-damage-only accidents could occur.

It is also used to alert against unsafe practices.

IMPORTANT

Alerts installer, servicer, or operator to potential actions that could cause

the product or system to operate improperly, but will not likely result in

potential for damage.

Related Literature

VAV-SVX01B-EN: UCM 4.0 and Wireless VAV Communication

VAV-SLB006-EN: Zone Occupancy Sensor

VAV-SLB007-EN: Digital Display Zone Sensor

VAV-SLB008-EN: Zone and Duct CO2 Sensor

VAV-SVP01A-EN: VariTrac Operator’s Guide

About This Manual

VAV-SVN03A-EN 3

FCC Information

VariTrac and Delivered VAV Radio and

Television Interference

VariTrac and Delivered VAV generate, use, and can radiate radio frequency

energy. If not installed and used in accordance with the instruction manual,

interference to radio and television reception may occur. VariTrac and

Delivered VAV are tested and comply with the limits for Class A computing

devices in accordance with the specifications in Subpart J of Part 15 of FCC

rules, to provide reasonable protection against such interference in a

commercial installation.

There is no guarantee that interference will not occur in a particular

installation. If interference does occur, consult a radio or television

technician for suggestions to correct the problem. Also, the booklet

How to

Identify and Resolve Radio-TV Interference Problems

is available from the

U.S. Government Printing Office, Washington, DC 20402.

Order stock #004-000-00345-4.

VAV-SVN03A-EN4

'HFODUDWLRQRI&RQIRUPLW\



Manufacturer’s Name:

Manufacturer’s Address:

Trane

4833 White Bear Parkway

Saint Paul, Minnesota 55110

USA

The manufacturer hereby declares that the product:



Product Name:

Product Number:

Product Option:

VariTrac CCP Controller

X13650940010; X13650942010

Operator Display

Conforms to the following standards or other normative documents:



Electromagnetic Emission:

(by Council Directive 89/336/EEC)

Electromagnetic Immunity:

EN 50081-1:1998

Radiated EN55022: 1998 Class B limit

Conducted EN55022: 1998 Class B limit

EN61326-1:1997 +A1: 1998

EN61000-4-2 ±4 kV contact discharge

±8 kV air discharge

EN61000-4-3 3 V/m

EN61000-4-4 ±1 kV

EN61000-4-5 ±1 kV

EN61000-4-6 3 V

EN61000-4-8 30 A/m

EN61000-4-11 1 cycle/100%

When and where issued

Electromagnetic Emission : 4/3/2001 Bounheng Saycocie

Electromagnetic Immunity: 4/17/2001 Design/Compliance Engineer

Saint Paul, Minnesota USA

Mark of Compliance European Contact



Societe Trane (Epinal, France)

1, rue des Ameriques, B.P. 6

F-88191 Golbey Cedex, France

Phone: (33) 329.31.73.00

Fax: (33) 329.81.24.98

This document validates CE conformity of the VariTrac CCP controller.



FCC Information

VAV-SVN03A-EN 5

VariTrac Changeover-Bypass

System

Overview

VariTrac Changeover-bypass VAV is a comfort system solution designed for

light commercial applications. As the name implies, these systems deliver a

varying volume of air to multiple zones, each with its own thermostat, while

still utilizing a unitary machine with a constant volume fan. Changeover-

bypass VAV combines the comfort benefits of VAV with the cost effective-

ness and simplicity of packaged unitary equipment.

Central Control Panel

The VariTrac Central Control Panel is the central source of communications

and decision making between the individual zones and the air conditioning

unit. Connections to the central control panel are:

•24 Vac power

•binary inputs for an occupied/unoccupied signal and external priority

shutdown signal (optional)

•ICS communication bus to the Trane building automation system (op-

tional)

•UCM communication bus to the zone dampers and communicating

sensor/bypass damper control and Trane Voyager™/Reliatel™ rooftop unit

•binary outputs to heating, cooling, and fan of non-Voyager or Reliatel

rooftop units

Unit Control Module (UCM)

A unit control module is mounted to each individual zone damper. Inputs

and outputs consist of the twisted shielded pair communication link, zone

temperature sensor, optional CO2 and occupancy sensors, 24 Vac power,

damper motor control, and local heat outputs. Local heat may be duct or

space mounted, and can be staged electric, pulse-width modulating electric,

and modulating or staged two-position hot water.

VariTrac Damper

Each VariTrac damper consists of an integrated 24 Vac actuator and control

box that encloses the UCM circuit board. The damper is designed to operate

in static pressures up to 1.75 inches wg.

VariTrac dampers are referred to by their dimensions:

•round damper sizes are 6, 8, 10, 12, 14, and 16 inches. The dampers con-

sists of an 18 gage galvanized steel frame with a round damper blade

assembly.

VAV-SVN03A-EN6

•rectangular damper sizes are 8 x 12, 8 x 14, 8 x 16, 10 x 16, 10 x 20, and

14 x 16 inches. The damper consists of a 16 gage galvanized steel frame

and opposed blade damper assembly.

Communicating Sensor/Bypass Damper Control

The communicating sensor/bypass damper assembly is a bypass damper

and communicating sensor/bypass control that resides on the same bus as

the VariTrac dampers and Voyager/Reliatel rooftop unit.

VariTrac Bypass Damper

Bypass dampers are non-communicating VariTrac dampers which include an

integrated actuator with a pre-wired interconnect cable that plugs into the

communicating sensor/bypass control.

•round bypass damper sizes are 6, 8, 10, and 12 inches. The damper con-

sists of an 18 gage galvanized steel frame with a round damper blade

assembly. The round bypass damper operates in duct static pressures up

to 1.75 inches wg.

•rectangular bypass damper sizes are 14 x 12, 16 x 16, 20 x 20, and 30 x 20

inches. The damper consists of a 13 gage galvanized steel frame and

opposed blade damper assembly. The rectangular bypass damper oper-

ates in duct static pressures up to 2.00 inches wg.

Communicating Sensor/Bypass Control

The Communicating Sensor/Bypass Control is composed of an integrated

UCM board, static pressure, and discharge air temperature sensors. It

directly controls the bypass damper and communicates duct conditions to

the central control panel.

The static pressure sensor measures duct static pressure and positions the

bypass damper(s) to maintain the static pressure setpoint.

The discharge air temperature sensor allows the CCP to determine the heat/

cool action of each individual UCM and cycles the heating and cooling

stages to maintain the discharge air temperature. Discharge air temperature

setpoints are also edited through the operator display or PC software.

Auxiliary Temperature Sensor

The auxiliary temperature sensor allows the operator to monitor air

temperature leaving a reheat device or measure duct temperature for

automatic operation of a standalone UCM.

Zone Temperature Sensors

Five zone temperature sensor configurations are available:

•sensor only

•sensor with adjustable setpoint and communications jack

•sensor with night setback override button, cancel button, and communica-

tions jack

•sensor with adjustable setpoint, night setback override button, cancel

button, and communications jack

VariTrac Changeover-Bypass System

VAV-SVN03A-EN 7

•sensor with digital display, adjustable setpoint, night setpoint override

button, cancel button, and communications jack

CO2 Sensor

A CO2 sensor may be connected to the UCM damper control to sense CO2

levels in the space. This signal is communicated to the CCP for demand

ventilation calculation and control.

Occupancy Sensor

A normally open occupancy sensor contact may be connected to the UCM

damper control binary input to indicate zone occupancy.

Operator Display (optional)

A 1/4 VGA monochrome LCD touch screen display is available for the CCP.

This display provides setup, diagnostic, and seven-day scheduling functions

to the system.

Service Model Number Description

Service model numbers determine product characteristics and are used

when ordering replacement parts. Each digit signifies product characteris-

tics. See Figure 1.

Figure 1: Service Model Number Description

VA DA06 BYP 1

Product Type

Damper Size

VA = VariTrac Product Families

D = Damper

R = Rectangular Damper

A = Development Sequence

DA06 = 6” Damper

DA08 = 8” Damper

DA10 = 10” Damper

DA12 = 12” Damper

DA14 = 14” Damper

DA16 = 16” Damper

RA0812 = 8” x 12” Zone Damper

RA0814 = 8” x 14” Zone Damper

RA0816 = 8” x 16” Zone Damper

RA1016 = 10” x 16” Zone Damper

RA1020 = 10” x 20” Zone Damper

RA1418 = 14” x 18” Zone Damper

RA1412 = 14” x 12” Bypass Damper

RA1616 = 16” x 16” Bypass Damper

RA2020 = 20” x 20” Bypass Damper

RA3020 = 30” x 20” Bypass Damper

Inventory Number

Damper Control

BYPS = Bypass Control

BYR = Rectangular Bypass Control

CHGR = Changeover Control

ELEC = 3 Stage, Primary Heat Disabled Control

NCHW = 1 Stage, Primary Heat Enabled

CO

2

Sensor

VAV-SVN03A-EN8

Figure 2: VariTrac Changeover Bypass System Configuration

Legend

Communications Link (2 cond, Level 4 comm wire)

24 Vac

Sensor wiring

Voyager or

Reliatel TCI-3

Bypass Damper

(w/connecting cable assembly)

Zone

Sensor

VariTrac Central

Control Panel

Communicating

Sensor/Bypass

Control Assembly

VariTrac

Zone Damper

24 Vac

Transformer

VariTrac Changeover-Bypass System

VAV-SVN03A-EN 9

Specifications

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VAV-SVN03A-EN10

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Specifications

VAV-SVN03A-EN 11

Communicating Sensor/Bypass Control

Assembly

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Relay Board Binary Outputs

Voltage provided: 24 Vac from air conditioning unit

Current: 10 VA maximum

Wire Specifications

Shielded Level 4 communication wire is now recommended for all commu-

nication link wiring on the new VariTrac CCP. This is the same wire which is

recommended for the Tracker Version 10 Comm5 communication link.

The term “Level 4” is used to specify a particular performance of communi-

cation wire and is normally associated with LonTalk™. Level 4 wire is differ-

ent from Category IV (four) wire and Category V (five) wire. The specification

information for Level 4 wire can be found in the “LonWorks™ FTT-10A Free

Topology Transceiver User ’s Guide” at www.echelon.com.

Shielded Level 4 communication wire can be purchased from two qualified

suppliers: Windy City Wire and Connect-Air.

Communicating Sensor/Bypass Control Assembly

VAV-SVN03A-EN12

Table 1: Communication Link Wire Specifications

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Specifications

VAV-SVN03A-EN 13

Getting Started

Familiarize yourself with the system components and preview the

installation procedures before installing and configuring the VariTrac

system.

Installation and configuring procedures appear in suggested order of

performance:

•Unpack and inspect the components

•Mount the wiring base

•Wire AC power

•Binary input wiring

•Output wiring

•Install communicating sensor/bypass damper control

•Install bypass damper(s) and connect to communicating sensor/bypass

control assembly

•Install VariTrac dampers

•Connect UCM wiring

•Set UCM DIP switches

•Install slaved dampers (if used)

•Install zone temperature sensors

•Communication link wiring

•Mount main module

•Install operator display (optional)

•Connecting modem devices

IMPORTANT

The CCP is designed to work with UCM III and IV VariTrac damper and

VariTrane VAV controllers produced beginning January 1995. If any other

dampers are used (especially on a retrofit job), please consult the factory

to confirm VariTrac Central Control Panel compatibility prior to installa-

tion.

Unpack and Inspect the Components

Inspect components for damage. Match each component to the packing list

to ensure that nothing was lost during shipment. Make sure that the litera-

ture is not lost or discarded with the packing material. Visually inspect the

central control panel for damage. All components are thoroughly inspected

before leaving the factory. Any claims for damage incurred in shipping must

be filed with the carrier.

VAV-SVN03A-EN14

Mount the Wiring Base

Figure 3: Termination module conduit access and mounting holes

Termination board

Conduit access

(three places)

Two holes for mounting on a wall

(one on each side)

Holes for mounting on a

4 in. x 4 in. conduit box

(four corners)

Holes for mounting on a 2 in. x 4 in.

conduit box vertically

(top and bottom)

Holes for mounting on a 2 in. x 4 in.

conduit box horizontally

(left and right)

Conduit connector

Jamb nut

(attaches to

conduit connector)

Mounting Requirements

Location

The VariTrac Central Control Panel should be mounted at a convenient level

and located where it will be easily accessible. If possible, locate the CCP

near the controlled equipment to reduce wiring cost.

Operating Environment

The VariTrac Central Control Panel is designed for indoor use only. It should

be located in a dust-free and corrosive-free environment, and within a range

of 32° to 120°F, and 10 to 90 percent humidity (non-condensing).

Clearances

Mount the VariTrac Central Control Panel on any vertical flat surface. The CCP

is approximately 8.75 inches high, 10.25 inches wide and 2.75 inches deep.

Getting Started

VAV-SVN03A-EN 15

The VariTrac Central Control Panel should be easily accessible for making

wiring connections and for servicing. Provide two inches of clearance on the

left and right sides, and sufficient clearance above the unit to make conduit

connections. Sufficient space should be available in front of the unit to

making wiring connections and perform maintenance.

Figure 4: Dimensions for VariTrac Central Control Panel Components

Front view Side view

8.75 in.

(22.38 cm)

2.75 in.

(6.99 cm)

10.25 in.

(26.04 cm)

Top view

Bottom view

Secure Termination Module to Wall

1Mark the location of the two mounting holes on the wall.

2Set the termination module aside and drill mounting holes.

3Secure the termination module to the wall with the supplied hardware

(#10 x 1 in. screw with plastic anchor).

Secure Termination Module to Wall

VAV-SVN03A-EN16

Secure Termination Module to Conduit Box

1Remove the screws from the conduit box.

2Line up the conduit box screw holes on the termination module (Figure 3)

with the screw holes on the conduit box.

3Install the screws.

NOTE: When mounting the termination module to a 4 in. x 4 in. conduit box,

remove the plastic cover over the box for easier access. Do not attempt to break

away excess plastic. Use a hack saw blade and carefully cut away the plastic.

Install VariTrac CCP Relay Board

1Separate the main module and front panel from the termination module.

2Remove the relay board from its packaging.

3Orient the relay board so that its 20-pin socket connector faces left (see

Figure 5).

4Slide the left edge of the board underneath the catches on the left side.

5Rotate the board to the catches on the right side.

6Snap the board into place by pressing on the terminal block or on the

right side of the board.

Figure 5: Installing Optional Relay Board

Getting Started

VAV-SVN03A-EN 17

Wire AC Power

CCP Field Wiring

Field wiring to the VariTrac Central Control Panel includes:

•AC power wiring

•binary input wiring

•communication link wiring

•binary output wiring (requires optional relay board)

These procedures are detailed in the following sections. Refer to Figure 6 for

wiring connections.

Figure 6: Field Wiring

24V

AC

VA

CO

MM4

CO

M

M

NO

T

US

ED

P

RI

O

RI

TY

S

H

U

TD

O

W

N

OCC

/

UNOC

1

2

3

4

5

6

7

8

9

1

0

11

12

1

3

14

1

5

24

V

a

c

Line volta

ge

Comm5

link

Co

mm

5

lin

k

Comm5 UCMTr

ac

k

er

Splice

2

1

4

3

3

AA

BB

A

A

B

B

Twisted pair, shielded wire

per Trane specifications

Shield termination

Earth ground

Contact points

Transformer

Termination resistor

Shield ground

=

=

=

=

=

=

=

Termination Board TB2

Figure note

=

Comm4

link

Co

mm

4

li

n

k

Comm4 UCMComm4 UCM

Splice

-

+

-

+

+

+

-

-

Le

g

en

d

Figure Notes

1 All customer wiring must be in acordance with

national, state, and local electrical codes.

2 Trane recommends a dedicated transformer

for 24 Vac power.

3 Do not apply voltage to the priority shutdown

and occupancy inputs.

4 Example of Comm5 communication link wiring.

See product-specific literature for Comm5 wire

connection details.

Wire AC Power

VAV-SVN03A-EN18

AC Power Wiring

A dedicated 24 Vac, 30 VA Class 2 transformer is required to power the

VariTrac Central Control Panel.

The VariTrac Central Control Panel requires 3-wire service with a nominal

voltage of 24 Vac and a utilization range of 20 to 30 Vac. All wiring must

comply with the National Electrical Code and local codes.

The 24 Vac line can enter the VariTrac Central Control Panel cabinet through

the 4 in. x 4 in. knockout or through the knockouts in the top of the panel.

Figure 3 shows the 24 Vac conduit entry holes. Connect the 24 Vac power

wires to TB2-1 and TB2-2 and the ground wire from the circuit breaker panel

ground to TB2-3 as shown in Figure 6. Use copper conductor wire only.

AC Power Checkout

After the 24 Vac connections have been made at TB2, apply AC power by

closing the circuit breaker for the Class 2 transformer.

Measure the voltages at TB2. The voltage between:

•TB2-1 and TB2-2 should be 20 to 30 Vac.

•TB2-1 and TB2-3 (ground) should be 20 to 30 Vac.

•TB2-2 and TB2-3 (ground) should be 20 to 30 Vac.

IMPORTANT

The 24 Vac power supplies must not be used to power any devices other

than the VariTrac Central Control Panel. This could result in malfunction of

the VariTrac Central Control Panel due to electrical noise.

WARNING

To prevent death or injuries from electrical shock, disconnect external

power to the VariTrac Central Control Panel before making power connec-

tions.

WARNING

When measurements are made with power on, use care to prevent injuries

or death from electrical shock.

Binary Input Wiring

Use 18-22 AWG twisted pair copper conductor wire for binary input wiring.

Wire run should be limited to less than 1,000 feet to avoid electrical noise

problems.

Refer to Figure 6 for proper connection of binary inputs.

Priority Shutdown Input Wiring

This input closes the connection between TB2-6 and TB2-7. The most likely

source of this input is a building management system or fire control panel,

but any other device allowing a dry contact connection may be used. When

the connection is open, the VariTrac Central Control Panel operates normally.

When the connection is closed, the CCP goes into priority shutdown.

Getting Started

VAV-SVN03A-EN 19

Occupied/Unoccupied Input Wiring

This input closes the connection between TB2-8 and TB2-9. This is most likely

from an external time clock, but any other device allowing a dry contact

connection may be used. When the connection is open, the VariTrac Central

Control Panel operates in the occupied mode. When the connection is

closed, the CCP operates in the unoccupied mode.

CAUTION

Do not run binary input wires and AC power wires together in the same

conduit or wire bundles.

CAUTION

Controlling the binary inputs on multiple VariTrac Central Control Panels

from a single contact closure is not permitted.

Output Wiring

Use only copper conductors for output wiring. The recommended wire size

is 16-22 AWG. Do not run output wires in the same conduit or wire bundle

with any AC power wires other than VariTrac Central Control Panel 24 V

ac

power.

Output wires should enter the cabinet through the conduit entry holes

shown in Figure 3. Output wiring connections at the VariTrac Central Control

Panel are shown in Figure 7.

The wire from the air conditioning unit to the CCP consists of one wire from

each stage of heating, cooling, the supply fan, and the leg of the 24 Vac

power source at the air conditioning unit. 24 Vac power single transformer

systems terminate power at Rh and Rc (TB1-1 andTB1-2). Two transformer

systems terminate the heating transformer at Rh (TB1-2) and the cooling

transformer at Rc (TB1-1).

The remaining wires are terminated per the diagram in Figure 7.

Binary output relay contacts are rated at 24 Vac, 1 amp 24 VA pilot duty.

IMPORTANT

All output wiring must comply with applicable electrical codes. Metal

conduit may be required by local codes.

IMPORTANT

Output wires run in the same conduit or wire bundle with any AC power

wires other than VariTrac Central Control Panel 24 Vac power could cause

the VariTrac Central Control Panel to malfunction due to electrical noise.

Occupied/Unoccupied Input Wiring

VAV-SVN03A-EN20

Figure 7: Binary Output Wiring for Optional Relay Board

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

NOT USED NC NO

AUX W2/O

W1 Y2 Y1 G Rh Rc

24 V*

C1

C2

Ht1

Ht22H/2C

Ht. Pump

*24 Vac from the rooftop unit. For single transformer systems,

connect Rc to Rh. For two transformer systems, connect the

cooling transformer to RC and the heating transformer to Rh.

C/O24 V* FAN

FAN

COMP1 COMP2 EM HT

Termination Board TB1

Install the Bypass Dampers and

Communicating Sensor/Bypass Control

Assembly

Install Bypass Dampers

Bypass damper(s) should be located before the first zone runs out from the

supply air duct. VariTrac dampers or supply duct branches should be

installed downstream of bypass dampers. The distance between bypass

dampers and the communicating sensor/bypass control should be two to

three equivalent duct diameters.

In a ducted return system, bypass dampers will be ducted directly to the

return air duct.

In systems with plenum return, bypass damper(s) should be ducted into the

return air riser. Confirm that sufficient relief or exhaust exists to prevent

return plenum pressurization. See Figure 8.

IMPORTANT

The use of a relief fan or backdraft damper is strongly recommended in the

return air system. This will prevent bypassed air from pressurizing the

return air duct system and spilling out of return grills into conditioned

space, especially when the unit is in economizer mode.

Getting Started

VAV-SVN03A-EN 21

Bypass Damper Wiring

The interconnect cable is pre-wired to the bypass damper and may be

lengthened if necessary.

IMPORTANT

Mounting screws must be located towards the ends of the damper when

hanging straps are used to avoid interference with the rotating damper. A

label attached to the dampers indicates the acceptable areas for mounting

screws.

IMPORTANT

The bypass damper must be positioned to orient the drive shaft horizon-

tally. Failure to do this may result in drive train malfunction (see Figure

11).

IMPORTANT

It is important to note the airflow direction when installing dampers. A

label for this is present on each damper assembly.

Mount the Communicating Sensor/Bypass Control

Figure 8: Mounting the Bypass Damper Communicating Sensor/Bypass

Control Assembly

Voya ger

Micro

Control

Heating and

Cooling Coils

Bypass

Damper Return

Air

Duct

Ductwork

12

3

1. Avoid high pressure turns and transitions

2. Use hard duct

3. Mount communicating Sensor/Bypass Controller

2-3 duct diameters upstream of bypass damper

The communicating sensor/bypass control is located between the supply

fan and the bypass damper in the least turbulent location possible. It is

recommended that the distance between the control and the nearest up-

stream transition be two to three equivalent duct diameters.

Bypass Damper Wiring

VAV-SVN03A-EN22

If the supply duct branches out at the riser, install the control in the largest

supply duct.

A two-inch hole is required to insert the temperature and static pressure

sensor. Use the supplied gasket to seal off air leaks. Secure the sensor to

the duct with a minimum of three sheet metal screws.

IMPORTANT

The sensor assembly should be mounted on the side of the duct to keep

the pressure transducer in a vertical orientation. Do not install horizontally

on the top or bottom of a duct.

Connect the Communicating Sensor/Bypass Control

Wiring

The pre-wired interconnect cable plugs into the actuator connector inside

the control. The cable is designed to connect in one orientation only.

Refer to the diagram and connect as follows:

1Plug the red actuator connector brom the BYPS damper onto the master

damper UCM socket (ACT) as shown in Figure 9.

2If two bypass dampers are used, connect the second bypass damper’s

red actuator plus to the spare connector socket pigtailed on the first

BYPS damper cable assembly.

3If cable assembly needs to be extended, cut and splice additional wire on

the BYPS damper end of the cable.

Figure 9: Wiring the Communicating Sensor/Bypass Control

Address

Switch DDC/UCM

Control Board

Shielded Twisted Pair

Communications Wiring

To NEC Class 2

24V Transformer

Load 8 VA (without actuator)

Female plug end of bypass

sensor assembly cable

Male plug end located on

DDC/UCM control board

DDC/UCM

Control Board

Step 2

Open

Close

Hot

Actuator

Step 1

Step 1

Air Supply

Temp Sensor

Static

Pressure

Port

Pressure

Transducer

Getting Started

VAV-SVN03A-EN 23

Install the VariTrac Dampers

A sketch of basic damper installation is shown in Figure 10. The damper may

be connected with hard duct or flex duct at either end.

If two bypass dampers are installed, a pigtail socket is provided on the cable

so the second damper can be plugged into the UCM.

IMPORTANT

Mounting screws must be located towards the ends of the damper when

hanging straps are used to avoid interference with the rotating damper. A

label attached to the dampers indicates the acceptable areas for mounting

screws.

IMPORTANT

It is important to note airflow direction when installing the damper. A

label for this is present on each damper assembly.

IMPORTANT

The control box on each damper must be positioned to orient the drive

shaft horizontally. Failure to do this may result in drive train malfunction.

(See Figure 11.)

Figure 10: VariTrac Damper Installation

Install the VariTrac Dampers

VAV-SVN03A-EN24

Figure 11: Proper Damper Mounting Positions

Connect UCM Wiring

Connect the power to terminals TB1-1 (24V) and TB1-2 (ground). 24 Vac is

required to power the UCM control. 20 Vac to 28 Vac is acceptable. Use 18 to

20 AWG for power wiring.

The power consumption for an auto-changeover cooling-only UCM (model

CHGR) is 10VA.

Local heat outputs are rated at 10VA maximum for each output. To

determine the total UCM power requirements, add the power consumption

of local heat to the circuit board power.

CAUTION

Use wires with copper conductors only. The use of aluminum or other

types of wire may result in overheating and equipment damage.

CAUTION

Connecting a shared UCM power supply with reversed polarity will cause

damage to the UCM, TCI, and central control panel.

CAUTION

When powering multiple UCMs from one transformer, polarity must be

maintained. Terminal TB1-1 is designated positive (+) and Terminal TB1-2 is

negative (–) to unit casing ground.

IMPORTANT

UCM control box cover must be replaced after field wiring to prevent

electromagnetic interference.

Getting Started

VAV-SVN03A-EN 25

Figure 12: UCM Wiring

Set the UCM DIP Switches

Each device connected to the VariTrac Central Control Panel must a unique

address. No two devices (of the same type) can have the same address.

Table 2 lists the address settings for UCM DIP switches connected to the

VariTrac Central Control Panel.

IMPORTANT

The UCM located in the communicating sensor/bypass control must always

be addressed as #33.

Set the UCM DIP Switches

VAV-SVN03A-EN26

Table 2: DIP Switch Settings for UCM Damper Addresses

DIP Switch Settings

Addresses 25-32 used for Delivered VAV only

UCM

Number 12346

5

ON

ON

ON ON

ON

ON

ON ON

ON

ON

ON

ON

ON

ON

ON ON

ON

ON ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON ON

ON

ON

ON ON

ON

ON

ON

ON

ON

ON

ON ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

ON

= Off

01

02

03

04

05

06

07

08

09

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

ON ON ON ON ON

32

ON ON ON ON

33

Communicating Sensor/Bypass Control only

ON

Example of Address #5

Slaved Dampers

In some applications it may be desirable to control an additional damper

from a single UCM. The slaved damper does not require a UCM circuit

board. For this reason a model BYPS damper is paralleled directly to the

Getting Started

VAV-SVN03A-EN 27

outputs of the UCM controlling the primary damper by using the BYPS

damper cable assembly shipped with the BYPS damper.

Refer to diagram and connect as follows:

1Disconnect the red actuator plug from the master damper UCM.

2Plug the red actuator connector from the BYPS damper onto the master

damper UCM socket (ACT) as shown in Figure 13.

3Reconnect the master damper actuator’s red connector to the spare

connector socket pigtailed on the BYPS damper cable assembly.

4If cable assembly needs to be extended, cut and splice additional wire on

the BYPS damper end of the cable.

Figure 13: Wiring for Slaved Damper

Address

Switch DDC/UCM

Control Board

Shielded Twisted Pair

Communications Wiring

To NEC Class 2

24V Transformer

Load 8 VA (without actuator)

Female plug end of bypass

sensor assembly cable

Male plug end located on

DDC/UCM control board

DDC/UCM

Control Board

Step 3

Steps

1 & 2

Steps

1 & 2

Open

Close

Hot

Actuator

Slaved Dampers

VAV-SVN03A-EN28

Install the Zone Temperature Sensors

Five types of zone temperature sensors are available. The sensors are

shown below in Figure 14:

•sensor with night setback override button, cancel button, and communica-

tions jack

•sensor with adjustable setpoint, night setback override button, cancel

button, and communications jack

•sensor with adjustable setpoint and communications jack

•sensor with night setback override button, cancel button, and communica-

tions jack

•sensor only

•sensor with digital display, adjustable setpoint, night setpoint override

button, cancel button, and communications jack.

Figure 14: Zone Sensor Options

Location

Proper temperature sensor location is crucial to occupant comfort. The

sensor should be placed in the most critical area of the zone where there is

free circulation of air. It should be mounted on a flat interior surface

approximately 54 inches from the floor, or as specified by the project plans

and specifications.

Avoid locating sensors in the following places:

•areas of direct sunlight

•areas blanketed by air from diffusers or subject to drafts

•surfaces with unconditioned areas behind them (such as an outside wall

or the wall of a storeroom)

Getting Started

VAV-SVN03A-EN 29

•areas near heat sources like equipment (appliances, computers, copiers,

etc.) or concealed pipes or chimneys

•dead spots behind doors, draperies, or in corners.

Mounting Standard and Digital Zone Temperature

Sensors

Zone temperature sensors consist of two basic pieces: the base and cover.

Externally adjustable versions have an external adjustment knob. To remove

the sensor cover from the base:

1Note the position of the adjustment knob (if present).

2Use a small screwdriver to gently pry the adjustment knob from the

cover.

3Before mounting a zone temperature sensor, remove zone sensor cover

by easing the tip of a small screwdriver between the base and the cover.

Gently lift the top of the screwdriver up. Do not force.

Follow these steps to replace the zone temperature sensor cover and (if

present) adjustment knob after mounting:

1Align the cover with the sides of the base.

2Press the cover toward the wall until it snaps into place.

3Align the knob to the position noted prior to its removal.

4Push the stem through the cover hole until the stem sits firmly in setpoint

potentiometer.

5Turn the knob to assure that it rotates freely through the entire range of

temperature settings.

Wall Mount

With the cover removed, feed the control wires through the rectangular

opening in the base. Follow these steps if mounting the sensor to a wall:

1Assuring that the base is level, position the back of the base over the wire

entry in the wall.

2Mark the centers of the two oblong mounting holes, then set aside the

base.

3Drill a 3/16 in. diameter hole approximately 1 in. deep at the marked

locations.

4Insert plastic anchors into the holes until they are firmly seated.

5Feed the control wires through the base and fasten the base to the wall

with the supplied mounting screws.

6Connect the control wires to the proper terminals on the temperature

sensor (See Figure 15).

7Replace the sensor cover.

Junction Box Mount

1With the cover removed, feed the control wires through the rectangular

opening in the base.

Mounting Standard and Digital Zone Temperature Sensors

VAV-SVN03A-EN30

2Using two #6-32 screws, fasten the base to the junction box’s threaded

mounting holes.

3Connect the control wires to the proper terminals on the temperature

sensor (See Figure 15).

4Replace the sensor cover.

Zone Temperature Sensor Wiring

A zone temperature sensor designed specifically for UCM damper control

must control each unit. Field wiring for the zone temperature sensors must

meet local code. If local codes require enclosed conductors, the zone tem-

perature sensor wires should be installed in conduit

Do not route zone temperature sensor wires in conduit with 24V or any

other high power conducting wires.

Different numbers of conductors are required based on the zone

temperature sensor used. The following table lists the options and number

of wires required.

Table 3: Zone Sensor Options

noitpOrosneSenoZ

forebmuN

deriuqeR

seriW

1

ylnorosneS2

tniopteselbatsujdahtiwrosneS3

edirrevokcabtesthginhtiwrosneS

snottublecnacdna 2

dnatniopteselbatsujdahtiwrosneS

lecnacdnaedirrevokcabtesthgin

snottub

3

dnayalpsidDCLhtiwrosneS

thgindnatniopteselbatsujda

snottublecnacdnaedirrevokcabtes

5

2

1. Some sensors have a communication jack available as an option. If these jacks

are used, they must be wired to the UCM using a separate two-conductor,

shielded cable that meets the specification for communication link wiring. Tape

back the shield of the communication link (if used) at the zone temperature

sensor and splice the other end into the adjoining communication link shield. The

communication jacks do not need to be wired for the system to operate properly.

Getting Started

VAV-SVN03A-EN 31

2. 3 wires are required for sensor connection. 2 wires are required for 24 Vac power

connection. For wire lengths less than 75 feet, an 18 gage, 5 conductor cable may

be used. For wire lengths greater than 75 feet, use 18 gage, 2 conductor cable for

the power wiring (TB1-TB1), and 18 gage, 3 conductor cable for signal wiring

(TB2-TB3).

Figure 15: Zone Temperature Sensor Controller Wiring

Zone Temperature Sensor Wiring

VAV-SVN03A-EN32

Communication Link Wiring

The VariTrac Central Control Panel communication link (TB2-10, 11, and 12)

connects the CCP, UCM dampers, communicating sensor/bypass damper

control assembly, and Voyager/Reliatel rooftop units. Field wiring for the

communication link must meet the following requirements:

•All wiring must be in accordance with the National Electrical Code and

local codes.

•Communication link wiring must be Level 4 22 AWG twisted, shielded pair

wire (meets or exceeds Trane specifications. See wiring specifications

sections in this manual for further information).

•The maximum total wire length is 3,500 feet for the communication link.

At the VariTrac Central Control Panel, the communication link wires must be

connected to Terminals TB2-10 (+) and TB2-11 (−). Refer to Figure 17. This

connection is polarity sensitive.

IMPORTANT

Connections between lengths of link wiring should be soldered and taped.

Wire nuts are not acceptable.

CAUTION

Connecting the communication link with reversed polarity will lead to

system malfunction and possible equipment damage.

The shield on the communication link wiring must be connected to TB2-12.

The shield wire should be spliced with the shield from the next section of

communication link wiring at every junction. Tape each splice to prevent any

contact between the shield and ground. The shield should be cut and taped

back at the end of the link.

Communication link wiring cannot pass between buildings.

IMPORTANT

Improper communication link shield connections will lead to system

malfunction.

IMPORTANT

Improper communication link routing will lead to system malfunction.

Connect UCMs on the communication link in a daisy-chain configuration.

With this configuration, it is easier to solve communication problems by

isolating portions of the communication link. See Figure 16 for an example

of a daisy-chain configuration.

Getting Started

VAV-SVN03A-EN 33

Figure 16: Daisy Chain Configuration for Communication Link Wiring

UCM Dampers

Central Control Panel

VariTrac

UCM Dampers UCM Dampers

UCM Dampers UCM Dampers UCM Dampers

Each Voyager/Reliatel Rooftop requires a Trane communications interface

(TCI) board for connection to the VariTrac Central Control Panel

communication link.

Refer to the TCI installation manual for more information on connecting a

rooftop to the communication link.

Communication Link Wiring

VAV-SVN03A-EN34

Figure 17: UCM Communication Link Wiring

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Splice

2

Termination Board TB2

Legend

Twisted pair, shielded wire

per Trane specifications

Shield ground

=

=

Figure note

=

Figure Notes

1 Shield must be cut back and taped at last unit controller.

2 A continuous shield is required. At each unit controller, splice shield

wire and tape back to prevent grounding.

VariTrac

COMM 4

+

-

COMM 5

Zone UCM Address #2 Zone UCM Address #1

Communicating Sensor / Bypass Control

Assembly Address #33

Address

Switch DDC / UCM

Control Board

Splice

To Zone Dampers

3 through 24 2

Address

Switch

Address

Switch DDC / UCM

Control Board

DDC / UCM

Control Board

Air Supply Temp Sensor

Pressure

Transducer

Static

Pressure Port

VOUT

1 2

Note

The UCM order in this drawing is for demonstration purposes only.

No specific order is required on the Comm link.

Getting Started

VAV-SVN03A-EN 35

Figure 18: Voyager Communication Link Wiring

Voyager (UPC)

Unit Control Panel

Comm Termination Details for Voyager RTU

(TCI-V)

1

2

Figure Notes

1 All dip switches off.

2 Comm board to non-isolated

Comm3 or Comm4 option.

VariTrac Communications

Interface (Comm4)

Voyager Communication Link Wiring

VAV-SVN03A-EN36

Figure 19: Precedent Communication Link Wiring

VariTrac Communications

Interface (Comm4)

Comm Termination Details for Voyager RTU

Precedent (UCP)

Unit Control Panel

(TCI-P)

Trane Communication

Interface-Precedent

1

2

Figure Notes

1 All dip switches off.

2 Comm board to non-isolated

Comm3 or Comm4 option.

Mount Main Module

After mounting and wiring the wiring base, attach the main module.

NOTE: It is not necessary to turn off 24 Vac power to the wiring base prior to mount-

ing and removing the main module.

•Verify that all the wires on the wiring base are securely fastened in place.

•Carefully line up the alignment pins on the wiring base with the back of

the main module (Figure 20).

Getting Started

VAV-SVN03A-EN 37

Figure 20: Mounting Main Module

Termination module

Main module

Alignment pin

(four places)

IMPORTANT

Do not use excessive force when mounting the module. If the module does

not snap easily into place, slightly reposition it on the alignment pins.

Failure to comply may cause damage to the module.

Firmly push the main module onto the wiring base until it snaps into place.

If 24 Vac is applied, the main module will start. The LEDs on the main

module will flash on and off after a few seconds

Install Operator Display (optional)

An operator display is available to provide monitoring and control of

VariTrac systems and UCM zones from one central location. The display

provides a ¼ VGA touch screen to allow the operator to interface with the

system. Temperature and system failure diagnostics and Voyager and

Precedent Rooftop unit alarms are indicated on the operator display screen

and in PC software.

NOTE: It is not necessary to turn off 24 Vac power to the wiring base prior to mount-

ing and removing the operator display.

After mounting the main module, attach the operator display.

•Tilt the top of the operator display about 30 degrees towards you.

Mounting Main Module

VAV-SVN03A-EN38

•Align the three tabs on the bottom of the display with the slots in the

bottom of the main module. (Figure 21).

•Starting with the center tab, insert the tabs into the slots.

Figure 21: Install operator display

IMPORTANT

Do not use excessive force when mounting the module. If the module does

not snap easily into place, slightly reposition it on the alignment pins.

Failure to comply may cause damage to the module.

Push the top of the display module toward the main module until it snaps

into place.

If 24 Vac is applied, the operator will turn on and display data.

Connecting Modem Devices

Remote communications may be accomplished through a Trane building

management system or with stand-alone modem attached to a single CCP

via the RS-232 port.

A US Robotics Sportster™ fax/data external modem is recommended for

CCP applications. Modems require hardware and software configurations

for use with the CCP

Physical connection of the modem to the VariTrac Central Control Panel is

shown in Figure 22.

Getting Started

VAV-SVN03A-EN 39

Figure 22: Modular Adapters, Cable, and Connections for External

Modems

To modem

serial port

Connect RJ-12 to

25-pin male

adapter

RJ-12 port for PC

direct connection

(bottom side)

RJ-12 cable

(PN: 35914269)

(PN: 35914260)

Termination module bottom view

RJ-12 port

(PC direct connection)

Connecting PC with VariTrac Software to CCP

The VariTrac PC Software provides a graphic user interface for VariTrac and

Delivered VAV systems. Advanced status and set-up information are avail-

able via a PC serial port connection.

Install the PC software on your PC following the instructions provided with

the software CD.

Connect your PC to the Central Control Panel as shown in Figure 23. The

connection is made using a PC serial port adapter and cable:

Adapter: DB9 female to RJ12 (PN: 3591 4262)

Cable: RJ12 to RJ12 (PN: 3591 4260)

Connecting Modem Devices

VAV-SVN03A-EN40

Figure 23: Typical VariTrac Central Control Panel to PC serial port connec-

tions

Connect RJ-12 to

9-pin female

adapter

To PC

serial port

RJ-12 port for PC

direct connection

(bottom side)

RJ-12 cable

(PN: 35914262)

(PN: 35914260)

Termination module bottom view

RJ-12 port

(PC direct connection)

Getting Started

VAV-SVN03A-EN 41

Installation Checklist

Complete this checklist as the VariTrac Central Control Panel is installed to

verify that all recommended procedures are performed. This checklist does

not replace the detailed instructions provided in the manual. Read the entire

manual carefully to become familiar with the installation procedures before

installing the unit.

Shipment

oInspect VariTrac Central Control Panel for shipping damage. File claim if

necessary.

oInspect zone dampers and accessories for shipping damage. File claim if

necessary.

Unit Location

oInstall VariTrac Central Control Panel in environment that meets tempera-

ture and humidity requirements.

oSecurely mount VariTrac Central Control Panel on wall at an accessible

location with proper clearances.

AC Power Wiring

oField installed AC power wiring complies with all applicable codes.

o24 Vac line from dedicated Class 2 transformer connected to VariTrac

Central Control Panel at TB2.

oVoltage measured at TB2-1 to TB2-2 is 20 to 30 Vac.

oAssure that a reliable earth ground has been attached to TB2-3.

Communicating Sensor/Bypass Assembly

oBypass damper(s) properly installed between supply/return ductwork per

instructions.

oCommunicating Sensor/Bypass Control mounted and wired to the

bypass damper(s).

oCommunication cable properly terminated at the Communicating Sensor/

Bypass Control and routed back to VariTrac Central Control Panel.

Input Wiring

oField installed input wiring complies with all applicable codes.

oOptional time clock and priority shutdown inputs terminated at TB2-6

through TB2-9 per instructions.

Output Wiring

oField installed output wiring complies with all applicable codes. If used,

relay wiring is terminated at TB1-1 through 11 per instructions.

VAV-SVN03A-EN42

VariTrac Dampers

oUCM dampers mounted and secure according to recommendations.

Zone Temperature Sensors

oSensors are properly mounted and wired per instructions and in the

correct space.

UCM Wiring

oUCM power is properly wired to TB1-1 and TB1-2.

NOTE: TB1-2 is COMMON (case ground) if grounded secondary transformers are

being used. Confirm polarity from one UCM to the next if more than one UCM is

being powered from a single transformer.

oConfirm voltage present between 20 Vac and 28 Vac.

oEnsure that the sensor is properly terminated.

oIf optional local heat is being used, confirm wiring per appropriate

diagram.

Communication Link Wiring

oField installed communications wiring complies with all applicable codes.

oVariTrac Central Control Panel communication link wiring to UCMs is

connected at TB2-10, TB2-11, and TB2-12 on the CCP.

oCommunication link wiring is properly terminated at each zone damper

UCM on terminals TB2-1 through TB2-6. Ensure that polarity (+ -) has

been maintained through the link.

oCommunication link wire shields spliced at each device junction and

taped to prevent contact with earth ground.

Installation Checklist

VAV-SVN03A-EN 43

System Start-Up

and Checkout

Pre-power-Up Checkout

Central Control Panel

•Measure the supply voltage to the CCP TB2-1 and TB2-2. The supply

voltage should be between 20 Vac and 30 Vac.

•Assure that a reliable ground is attached to TB2-3 on the CCP.

•Check the UCM communication link to assure that the wire designated (+)

is connected to the TB2-10 and the wire designated (–) is terminated at the

TB2-11. The shield must be connected to TB2-12.

WARNING

The following test should not be performed until all people and equipment

are clear of the air conditioning unit.

If the air handling unit is controlled by the optional field installed relay

board, check the operation of the supply fan and heating and cooling stages

by jumping the appropriate terminals of the binary output terminal block

TB1. This check assures that the wires are properly terminated at the CCP

and that the air conditioning unit is operational.

UCM

•Verify that the damper is installed with the drive shaft horizontal. See the

Installation and Wiring section of this manual for more details.

•Check to assure that all mounting screws are a minimum of three inches

away from the center damper bead if hanging straps are used. This allows

full rotation of the damper.

•Check the supply voltage at TB1-1 and TB1-2. Polarity is important. Notice

that TB1-1 is designated 24V and TB1-2 is designated ground to unit casing

ground. The acceptable voltage present is 20 Vac to 28 Vac.

CAUTION

Connecting a shared UCM power supply with reversed polarity will cause

damage to the UCM, TCI, and Central Control Panel.

When powering multiple UCMs from one transformer, polarity must be

maintained. Terminal TB1-1 is designated 24V and Terminal TB1-2 is GND to

unit casing ground.

•Verify that communications wiring is terminated at TB2-1 (+) and TB2-2 (–).

Polarity is important.

•Verify that zone sensor connections are correct as detailed in the Installa-

tion and Wiring section of this manual.

VAV-SVN03A-EN44

•Verify that the proper unit address is set on each UCM.

Occupied Mode

After the system is completely wired and installed it is ready for the initial

power-up. Upon power-up the CCP and UCMs will initiate the sequence of

events that follows.

IMPORTANT

For the CCP start-up sequence to begin, it is necessary for one UCM and a

communicating sensor/bypass control on the loop to communicate with

the CCP.

•The CCP prepares for static calibration.

•UCMs begin driving closed to perform their calibration reset.

•After calibration, the UCMs are driven to maximum position, and the

bypass begins to close.

•The “zero flow” voltage reading is taken with the fan off.

•System fan is turned on for approximately 45 seconds.

•High flow static sensor voltage is taken and stored in the CCP.

•The bypass damper is then driven to 50 percent and released.

•The UCMs are released from their MAX flow position.

•UCMs are scanned and heating/cooling callers are established.

•Fan remains on if edited to occupied fan mode “on”.

•Fan energizes if occupied fan mode is edited to “auto” and sufficient

requests are present.

•The control action of each UCM changes as appropriate.

•Heating or cooling is staged to maintain the discharge air temperature.

Unoccupied Mode

Each time the CCP enters the unoccupied mode, a static sensor self-

calibration sequence takes place.

Powering Down the System

CCP power must be disconnected to avoid unnecessary zone tagging and

personal injury during service.

UCM LEDs

Green and yellow LEDs on the circuit board help diagnose communication

or circuit board problems. Conditions indicated by the LEDs are:

System Start-Up and Checkout

VAV-SVN03A-EN 45

Green LED

NO noitarepOlamroN

FFO draobevitcefedro,rewopcaV42oN

GNIKNILB draoBevitcefeD

Yellow LED

NO ytiralopknilnoitacinummocdesreveR

FFO ytivitcaknilnoitacinummocoN

draobevitcefedro

WOLS

KNILB MCUtahtrofdednetnitonknilehtnonoitacinummoC

TSAF

KNILB PCCehthtiwdetacinummocMCUehT

UCM LEDs

VAV-SVN03A-EN46

System Start-Up and Checkout

VAV-SVN03A-EN 47

Tests and

Troubleshooting

Displayed Failures

Static Sensor Calibration Failure

If static sensor calibration fails, the CCP uses 0.50 inch wg as the static

pressure setpoint.

The zone dampers continue to control normally. Failed static sensor

calibration may indicate that the position or location of the sensor is not

correct. See mounting the communicating sensor/bypass control in this

manual. The following conditions create a static sensor calibration failure:

•No UCMs are communicating

•No UCM can be driven to MAX due to group level overrides

•Zero static reading was not in the range of 0.15 to 0.45 Vdc

•High flow static reading is less than 0.10 Vdc greater than the zero static

reading

•Fan does not run during the start-up calibration sequence

•Design static pressure value is too low

•Bypass damper(s) are operating incorrectly

Discharge Air Temperature Sensor Failure

If the discharge air temperature sensor fails, the CCP issues a priority

shutdown command:

•All zone dampers drive to maximum

•Bypass damper drives to 50 percent

•Fan and all stages of heating and cooling are de-energized

This failure appears in diagnostics on the operator display and PC software

A shorted or open temperature sensor or failed communicating sensor/

bypass control is the cause.

Communication Failure

If communications fails (no UCMs communicating), the CCP:

•De-energizes the fan and all stages of heating and cooling

•Drives the bypass to 50 percent

Individual UCM communications failures are displayed in diagnostics on the

operator display and PC software. Check all wiring connections and polarity.

See the Communications Troubleshooting section in this manual for details.

VAV-SVN03A-EN48

Zone Sensor Failure

If the zone sensor fails, the damper drives to minimum position, and its vote

is excluded.

Zone Setpoint Failure

If a setpoint fails, the UCM automatically uses the edited occupied cooling

and heating setpoints.

Auxiliary Sensor Failure

If the auxiliary sensor circuit opens, the temperature reading on the display

screen reads and a diagnostic is be displayed on the operator display and

PC software. If the auxiliary sensor is used on a stand alone UCM to

establish the control action, the UCM remains in the current control action.

Static Pressure Sensor Troubleshooting

The static pressure sensor signal enables the CCP to recognize system static

and adjust the bypass damper accordingly. If a problem exists with the

sensor or its location, the bypass damper controls with default values. If a

“failure” persists, perform the following:

1On the communicating sensor/bypass control UCM, read the voltage

across J3-1 (green wire) and J3-3 (red wire). Voltage should be between

4.50 Vdc and 5.50 Vdc.

2Read the transducer output voltage across J3-1 (green wire) and J3-2

(black wire). Voltage should be between 0.20 Vdc and 0.45 Vdc. Record the

zero flow voltage.

3Wait approximately 4 minutes after power-up for the system fan to start.

Read the transducer output voltage again across J3-1 (green wire) and

J3-2 (black wire). The difference between this voltage and the zero flow

voltage should be 0.10 Vdc minimum.

4If a defective transducer is suspected, check the output voltage with a

low-pressure source and Magnahelic gauge. Record the zero flow volt-

age. Connect a low-pressure source and Magnahelic gauge to the “hi”

port of the transducer. Input 1 inch of pressure. The voltage should be

approximately 0.750 Vdc greater than the zero flow voltage. The reading

on the voltmeter will include the zero flow voltage.

CAUTION

Do not exceed 2 inches of input pressure to avoid damaging the tranducer.

Signal change must be 0.10 Vdc minimum or a “AHU air flow” “failed”

message will be displayed

Zone, Auxiliary and System Temperature Sensor

Checkout

If temperature is reported to the UCM or CCP seems wrong use the

temperature-resistance table (Table 4) to verify the integrity of the adjustable

setpoint potentiometer or the sensor. Measure resistance across the

terminals the device is connected to. For details of terminal connections see

the Installation and Wiring section of this manual.

Tests and Troubleshooting

VAV-SVN03A-EN 49

Table 4: Temperature Resistance Table

pmeT leehwbmuhT

ecnatsiseR

rosneS

ecnatsiseR

03-

02-

01-

0

01

02

03

04

05

-

-

-

-

-

-

-

-

-

000142

000071

000121

00088

00046

00074

00053

00062

00002

55

65

75

85

95

297

277

357

337

417

85961

14561

53161

14751

85351

06

16

26

36

46

56

66

76

86

96

496

576

656

636

716

795

875

855

935

915

26941

50641

75241

81931

88531

66231

25621

64321

74321

65021

07

17

27

37

47

57

67

77

87

97

005

184

164

244

224

304

383

463

443

523

17711

39411

22211

75901

89601

54401

79101

5999

8179

7849

08

18

28

38

48

58

603

682

762

742

822

802

0629

8309

1288

8068

9938

5918

09

001

021

031

041

051

571

002

-

-

-

-

-

-

-

-

0037

0085

0083

0003

0052

0002

0031

738

Zone, Auxiliary and System Temperature Sensor Checkout

VAV-SVN03A-EN50

UCM Local Heat Checkout

Turn the adjustable zone sensor to full heating, or adjust the temperature

setpoints at the CCP.

IMPORTANT

Model DCEA local heat outputs are disabled in the heating control action.

Model DCWA local heat outputs are enabled in the heating or cooling

control action.

To check the local heat outputs:

•Disconnect any connections to Terminals J8, J9, J10, or J11.

•Place a 500 to 1000 ohm resistor between Terminals common (J8) and the

terminals (J9, J10, or J11) tested. This simulates a load condition across

the triacs within the circuit board.

•Measure the voltage between J8 (common) and the appropriate output

(J9, J10, and J11). When the heat is off, the voltage will measure between 0

and 1.5 Vac. When heat is on, voltage should read 24 Vac.

Central Control Panel Input/Output Test

Binary Input Tests

With the system in the occupied mode:

•Jump the priority shutdown input (TB2-5 and TB2-6) with a wire. The

system goes into priority shutdown.

•Remove the jumper on the priority shutdown input. Normal system

operation is restored.

•Jump the uncc input with a wire (TB2-6 and TB2-7). The system goes into

the unoccupied mode.

•Remove the jumper wire from the uncc input. The system will go into the

occupied mode.

Communicating Sensor/Bypass Control Test

The following defines the procedure necessary to test the supply air

temperature and static pressure sensor inputs to the communicating sensor/

bypass sensor control:

Supply Air Temperature Input Test

•Disconnect the supply air temperature sensor from communicating

sensor/bypass control terminals TB3-6 and TB3-7.

•System goes into priority shutdown.

•Disconnect the static sensor from J3.

•System displays static pressure failure.

•Input a resistance value between 9.4K and 10.5K across terminals TB3-6

and TB3-7. System returns to normal operation.

Tests and Troubleshooting

VAV-SVN03A-EN 51

Static Pressure Sensor Input Test

In order to perform this test a voltage between 0.25 Vdc and 0.7 Vdc must be

present at J3 pins 2 and 3. This voltage is from the pressure transducer in

the communicating sensor/bypass control. If system pressure is insufficient

to create at least .25 Vdc apply pressure to the transducer with an alternate

pressure source.

CAUTION

Do not over pressurize the transducer. The maximum pressure signal

should not exceed 2 inches H20.

When the voltage is between 0.25 Vdc and 0.7 Vdc the static pressure failure

clears.

Binary Output Test

The relay board binary outputs may be manually controlled from either the

operator display or the PC software.

Great care must be taken when manually controlling these relays. There are

NO minimum on-off timers or safe guards in effect during test mode. See

the CCP operator guide for complete description of the binary output test.

WARNING

This test can energize the fan and both stages of heating and cooling at

the rooftop unit. Before starting this test make sure that all persons, tools,

etc. are clear.

System Troubleshooting

Contact your Trane representative for problems that cannot be resolved

using these guidelines.

Static Pressure Sensor Input Test

VAV-SVN03A-EN52

Tests and Troubleshooting

VAV-SVN03A-EN 53

Delivered VAV System

Overview

What is Delivered VAV?

Delivered VAV is a small tonnage VAV system made up of three Trane prod-

uct families. It is the combination of:

•Voyager Commercial 27 ½ to 50 ton VAV Packaged Rooftop Unit

•Up to 32 VariTrane VAV boxes with DDC Controls

•VariTrac Central Control Panel with Operator Display

Delivered VAV will only work with this combination of Trane products. It will

not support any other types of equipment.

The Voyager Commercial 27 ½ to 50 ton rooftop unit must be a VAV model

with factory installed inlet guide vanes or variable frequency drive, micro-

processor controls, and Trane Communications Interface.

Delivered VAV will support up to 32 VariTrane VAV boxes with the DDC

controls option. They may be single duct boxes or fan powered boxes, and

may have a factory installed local heat option if desired.

The heart of the system is the VariTrac Central Control Panel with Operator

Display. The CCP acts as the communications hub of the system. It is

responsible for coordinating the actions of the VAV rooftop and the actions

of the VAV boxes with each other to meet the comfort requirements of the

zones.

As in any other application, the Voyager Commercial VAV unit runs the

supply fan at full constant volume whenever it goes into the heating mode,

with all the VAV boxes commanded to maximum flow. For this reason the

unit heat is only used for the Morning Warm-up and Daytime Warm-up

modes available on the Voyager Commercial unit. In both of these modes

the VAV boxes are commanded to maximum flow. If individual zone heat-

ing is required during normal daytime operation, a local heat source must

be provided at the box.

What Delivered VAV is Not

Delivered VAV is not changeover-bypass VAV. It is a true pressure indepen-

dent VAV system. The fact that we utilize the VariTrac Central Control Panel

as the heart of the system does not make it a VariTrac system. There is no

bypass damper in this system.

Additionally, Delivered VAV will only work with the combination of the

Voyager Commercial VAV unit, VariTrane VAV boxes with DDC controls, and

the VariTrac CCP with Operator Display. It will not support any other types

of equipment.

VAV-SVN03A-EN54

Figure 24: Delivered VAV System Configuration

Legend

Communications Link (2 cond, Level 4 comm wire)

24 Vac

Sensor wiring

24 Vac

Transformer

VariTrac

Central Control Panel

w/ Operator Display

VAV

Terminal

Unit

Zone

Sensor

Voyager

Commercial VAV Unit

(27 1/2 to 50 ton)

Delivered VAV System

VAV-SVN03A-EN 55

Central Control Panel

The VariTrac Central Control Panel is the central source of communications

and decision making between the individual zones and the air conditioning

unit. Connections to the CCP are:

•24 Vac power

•binary inputs for an occupied/unoccupied signal and external priority

shutdown signal (optional)

•ICS communication bus to the building automation system (optional)

•UCM communication bus to the VAV boxes and Trane Voyager commercial

27 ½ - 50 ton VAV rooftop unit

Unit Control Module (UCM)

A unit control module is mounted to each individual VAV terminal unit.

Inputs and outputs consist of the twisted shielded pair communication link,

zone temperature sensor, optional CO2 and occupancy sensors, 24 Vac

power, damper motor control, and local heat outputs. Local heat may be

duct or space mounted, and can be staged electric, pulse-width modulating

electric, and modulating or staged two-position hot water.

VariTrane VAV Terminal Units

The function of the VariTrane terminal unit in a VAV control zone is to vary

the volumetric airflow rate to the zone. VariTrane units are supplied with

microprocessor-based DDC controls. Factory-installed controls are required

with all types of terminal units.

VariTrane VAV Terminal Unit Types

Single Duct

Single duct terminal units control the volumetric flow of supply air to the

space to maintain the zone temperature at setpoint. These units are gener-

ally applied in cooling-only VAV zones that require no heat during occupied

hours. If local zone heat is necessary, it can be provided either remotely (for

example, perimeter heat) or by terminal reheat (either electric or hot water

coils).

Parallel Fan-Powered

Parallel fan-powered units are commonly used in VAV zones that require

some degree of heat during occupied hours when the primary supply air is

cool. The terminal unit fan is in parallel with the central unit fan; no primary

air from the central fan passes through the terminal unit fan. The terminal

unit fan draws air from the space return plenum.

Series Fan-Powered

Series fan-powered terminal units are used commonly in VAV zones that not

only require heat during occupied hours, but also desire constant air vol-

ume delivery. The terminal unit fan is in series with the central fan. Primary

air from the central fan always passes through the terminal unit fan.

Central Control Panel

VAV-SVN03A-EN56

The local series fan within the terminal unit operates whenever the unit is in

the occupied mode. The volume of air delivered to the VAV zone is constant,

but the temperature of the delivered air varies. As the zone requires less

cooling, the primary air damper closes. As the primary air damper closes,

the air mixture supplied to the zone contains less cool air and more warm

plenum air. Remote heat or terminal reheat can provide additional local

heating.

Auxiliary Temperature Sensor

The auxiliary temperature sensor allows the operator to monitor air tem-

perature leaving a reheat device or measure duct temperature for automatic

operation of a standalone UCM.

Zone Temperature Sensors

Five zone temperature sensor configurations are available:

•sensor only

•sensor with adjustable setpoint and communications jack

•sensor with night setback override button, cancel button, and communica-

tions jack

•sensor with adjustable setpoint, night setback override button, cancel

button, and communications jack

•sensor with digital display, adjustable setpoint, night setpoint override

button, cancel button, and communications jack

CO2 Sensor

A CO2 sensor may be connected to the UCM damper control to sense CO2

levels in the space. This signal is communicated to the CCP for demand

ventilation calculation and control.

Occupancy Sensor

A normally open occupancy sensor contact may be connected to the UCM

damper control binary input to indicate zone occupancy.

Operator Display

A ¼ VGA monochrome LCD touch screen display is installed on the CCP. This

display provides setup, diagnostic, and seven-day scheduling functions to

the system.

Delivered VAV System

VAV-SVN03A-EN 57

Getting Started

Familiarize yourself with the system components and preview the installa-

tion procedures before installing and configuring the Delivered VAV system.

Installation and configuring procedures appear in suggested order of

performance:

Installing the Central Control Panel

Refer to the following installation procedures for the CCP in this manual

•Unpacking and inspecting the components

•Wiring AC power

•Binary input wiring

NOTE: Ignore the sections referring to Installation of the CCP Relay Board and

Binary Output Wiring. Those sections do not apply to this system.

Install VariTrane VAV Terminal Units

Refer to the appropriate installation instructions shipped with the VariTrane

air terminal devices for proper installation.

Connect UCM Wiring

Refer to Connect UCM Wiring in this manual, and the appropriate installa-

tion instructions shipped with the VariTrane air terminal devices.

Set UCM DIP Switches

Refer to Set UCM DIP Switches and Table 2 in this manual, and the appropri-

ate installation instructions shipped with the VariTrane air terminal devices.

Installing Zone Temperature Sensors

Refer to Installing Zone Temperature Sensors in this manual.

Communications Link Wiring

The VariTrac Central Control Panel communication link (TB2-10, 11, and 12)

connects the CCP, VAV UCMs, and Voyager VAV rooftop unit. Field wiring for

the communication link must meet the following requirements:

•All wiring must be in accordance with the National Electrical Code and

local codes.

•Communication link wiring must be Level 4 22 AWG twisted, shielded pair

wire (meets or exceeds Trane specifications. See wiring specifications

sections in this manual for further information).

•The maximum total wire length is 3,500 feet for the communication link.

VAV-SVN03A-EN58

At the VariTrac Central Control Panel, the communication link wires must be

connected to Terminals TB2-10 (+) and TB2-11 (−). Refer to Figure 26. This

connection is polarity sensitive.

IMPORTANT

Connections between lengths of link wiring should be soldered and taped.

Wire nuts are not acceptable.

CAUTION

Connecting the communication link with reversed polarity will lead to

system malfunction and possible equipment damage.

The shield on the communication link wiring must be connected to TB2-12.

The shield wire should be spliced with the shield from the next section of

communication link wiring at every junction. Tape each splice to prevent any

contact between the shield and ground. The shield should be cut and taped

back at the end of the link.

Communication link wiring cannot pass between buildings.

IMPORTANT

Improper communication link shield connections will lead to system

malfunction.

IMPORTANT

Improper communication link routing will lead to system malfunction.

Connect UCMs on the communication link in a daisy-chain configuration.

With this configuration, it is easier to solve communication problems by

isolating portions of the communication link. See Figure 25 for an example

of a daisy-chain configuration.

Getting Started

VAV-SVN03A-EN 59

Figure 25: Daisy Chain Configuration for Communication Link Wiring

VAV Terminal Unit

VAV Terminal Unit VAV Terminal Unit VAV Terminal Unit

VAV Terminal Unit VAV Terminal Unit

Central Control Panel

VariTrac

with Operator Display

Each Voyager VAV Rooftop requires a Trane communications interface (TCI)

board for connection to the VariTrac Central Control Panel communication

link.

Refer to the TCI installation manual for more information on connecting a

rooftop to the communication link.

Daisy Chain Configuration for Communication Link Wiring

VAV-SVN03A-EN60

Figure 26: UCM Communication Link Wiring

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Splice

2

Termination Board TB2

Legend

Twisted pair, shielded wire

per Trane specifications

Shield ground

=

=

Figure note

=

Figure Notes

1 Shield must be cut back and taped at last unit controller.

2 A continuous shield is required. At each unit controller, splice shield

wire and tape back to prevent grounding.

VariTrac

COMM 4

+

-

COMM 5

VAV UCM Address #3 VAV UCM Address #2 VAV UCM Address #1

Address

Switch DDC / UCM

Control Board

Splice

To VAV Terminal Units

4 through 32 2

Address

Switch

Address

Switch DDC / UCM

Control Board

DDC / UCM

Control Board

1 2

Note

The UCM order in this drawing is for demonstration purposes only.

No specific order is required on the Comm link.

Getting Started

VAV-SVN03A-EN 61

Figure 27: Voyager Communication Link Wiring

Voyager (UPC)

Unit Control Panel

Comm Termination Details for Voyager RTU

(TCI-V)

1

2

Figure Notes

1 All dip switches off.

2 Comm board to non-isolated

Comm3 or Comm4 option.

VariTrac Communications

Interface (Comm4)

Voyager Communication Link Wiring

VAV-SVN03A-EN62

Getting Started

VAV-SVN03A-EN 63

Installation Checklist

Complete this checklist as the VariTrac Central Control Panel is installed to

verify that all recommended procedures are performed. This checklist does

not replace the detailed instructions provided in the manual. Read the entire

manual carefully to become familiar with the installation procedures before

installing the unit.

Shipment

oInspect VariTrac Central Control Panel for shipping damage. File claim if

necessary.

oInspect VAV terminal units and accessories for shipping damage. File

claim if necessary.

Unit Location

oInstall VariTrac Central Control Panel in environment that meets tempera-

ture and humidity requirements.

oSecurely mount VariTrac Central Control Panel on wall at an accessible

location with proper clearances.

AC Power Wiring

oField installed AC power wiring complies with all applicable codes.

o24 Vac line from dedicated Class 2 transformer connected to VariTrac

Central Control Panel at TB2.

oVoltage measured at TB2-1 to TB2-2 is 20 to 30 Vac.

oAssure that a reliable earth ground has been attached to TB2-3.

Input Wiring

oField installed input wiring complies with all applicable codes.

oOptional time clock and priority shutdown inputs terminated at TB2-6

through TB2-9 per instructions.

VariTrane Terminal Units

oAir terminal units mounted and secure according to recommendations.

Zone Temperature Sensors

oSensors are properly mounted and wired per instructions and in the

correct space.

UCM Wiring

oUCM power is properly wired to TB1-1 and TB1-2.

NOTE: TB1-2 is COMMON (case ground) if grounded secondary transformers are

being used. Confirm polarity from one UCM to the next if more than one UCM is

being powered from a single transformer.

VAV-SVN03A-EN64

oConfirm voltage present between 20 Vac and 28 Vac.

oEnsure that the sensor is properly terminated.

oIf optional local heat is being used, confirm wiring per appropriate

diagram.

Communication Link Wiring

oField installed communications wiring complies with all applicable codes.

oVariTrac Central Control Panel communication link wiring to VAV UCMs

and Voyager VAV rooftop unit is connected at TB2-10, TB2-11, and TB2-12

on the CCP.

oCommunication link wiring is properly terminated at each zone damper

UCM on terminals TB2-1 through TB2-6. Ensure that polarity (+ -) has

been maintained through the link.

oCommunication link wire shields spliced at each device junction and

taped to prevent contact with earth ground.

Completing Central Control Panel

Assembly

Mount Main Module

Refer to Mount Main Module instructions in this manual.

Install Operator Display

Refer to Install Operator Display instructions in this manual. The Operator

Display is required for the Delivered VAV system to function.

Connecting Modem Devices

Refer to Connecting Modem Devices instructions in this manual.

Installation Checklist

Literature Order Number VAV-SVN03A-EN

File Number SV-AH-VAV-000-SVN03A-EN-0602

Supersedes VADA-IN-2

Stocking Location La Crosse

Trane has a policy of continuous product and product data improvement and reserves the right to change

design and specifications without notice. Only qualified technicians should perform the installation and

servicing of equipment referred to in this publication.

Trane

An American Standard Company

www.trane.com

For more information contact

your local district office or

e-mail us at comfort@trane.com