Trane VariTrac Dampers Installation and Maintenance Manual

Installation Guide

VariTrac™ Dampers

SAFETY WARNING

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

September 2010 VAV-SVN04B-EN

Warnings, Cautions and Notices

Warnings, Cautions and Notices. Note that warnings, cautions and notices appear at

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

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

ATTENTION: Warnings, Cautions and Notices appear at appropriate sections throughout

this literature. Read these carefully.

WARNING: Indicates a potentially hazardous situation which, if not avoided, could

result in death or serious injury.

CAUTION: Indicates a potentially hazardous situation which, if not avoided, could

result in minor or moderate injury. It could also be used to alert against unsafe practices.

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

accidents.

 WARNING

Personal Protective Equipment (PPE) Required!

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

• Before installing/servicing this unit, technicians MUST put on all Personal Protective
Equipment (PPE) recommended for the work being undertaken. ALWAYS refer to appropriate
MSDS sheets and OSHA guidelines for proper PPE.

• When working with or around hazardous chemicals, ALWAYS refer to appropriate MSDS and
OSHA guidelines for information on allowable personal exposure levels, proper respiratory
protection and handling recommendations.

• If there is a risk of arc or flash, technicians MUST put on all Personal Protective Equipment (PPE)
in accordance with NFPA70E or other country-specific requirements for arc/flash protection
PRIOR to servicing the unit.

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

WARNING

Proper Field Wiring and Grounding Required!

All field wiring MUST be performed by qualified personnel. Improperly installed and grounded
field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow
requirements for field wiring installation and grounding as described in NEC and your local/
state electrical codes. Failure to follow codes could result in death or serious injury.

© 2010 Trane All rights reserved VAV-SVN04B-EN

Warnings, Cautions and Notices

Overview of Manual

Note: At least one copy of this document ships with every order and is customer property. It must

be retained by the unit's maintenance personnel.

This booklet describes proper installation procedures for delivered air systems. By carefully
reviewing the information within this manual and following the instructions, the risk of improper
operation and/or component damage will be minimized. It is important that periodic maintenance
be performed to help assure trouble free operation. Should equipment failure occur, contact a
qualified service organization with qualified, experienced HVAC technicians to properly diagnose
and repair this equipment.

General

These instructions do not cover all variations in systems nor provide for every possible
contingency that may arise at a job site installation.

Inspection

Check carefully for any shipping damage. This must be reported to and claims made against the
transportation company immediately. Any missing parts should be reported to your supplier at
once and replaced with authorized parts only.

VAV-SVN04B-EN 3

Table of Contents

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Damper Descriptions & Actuator Specifications . . . . . . . . . . . . . . . . . . . . . . . . 5

Install Bypass Dampers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Bypass Damper Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Installing the Communicating Sensor/Bypass Control . . . . . . . . . . . . . . . . . . . 8

Connect the Communicating Sensor/Bypass Control Wiring . . . . . . . . . . . . . 9

Install the VariTrac Dampers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Connect UCM Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Round Dampers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Table 1. Round bypass dampers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Table 2. Round zone dampers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Rectangular Bypass Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Table 3. Rectangular bypass dampers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Rectangular Zone Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 4. Rectangular zone dampers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Actuator Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 1. Bypass damper installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 2. Installing the communicating sensor/bypass control . . . . . . . . . . . . . 8

Figure 3. Proper damper mounting positions. . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 4. VariTrac damper installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

DIP Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 5. DIP switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 5. Typical VariTrac Zone/Changeover Wiring Diagram. . . . . . . . . . . . . 13

4 VAV-SVN04B-EN

General

Damper Descriptions & Actuator Specifications

Round Dampers

Cylinder: 18-gage galvanized–rolled and seam welded

Damper: Two 22-gage galvanized steel plates locked together with an elastomeric gasket

sandwiched between.

Actuator: Internal actuator w/synchronous motor and gear reduction is direct coupled to the
damper shaft. It has a drive time of 60 seconds.

• Electrical Rating:

• Power Supply—24 VAC (20 to 30 VAC) at 50/60 Hz

• Transformer Sizing—2.0 VA maximum at nominal voltage, Class 2

Table 1. Round bypass dampers

Size Diameter (in.) Length (in.) Shipping Weight

6 17 17 lbs

8 17 19 lbs

10 17 20 lbs

12 17 21 lbs

14 17 23 lbs

16 17 25 lbs

Table 2. Round zone dampers

Size Diameter (in.) Length (in.) Shipping Weight

Rectangular Bypass Damper

Sheet Metal Box: 22-gage galvanized steel

Length: 16"

Damper Frame: 18-gage galvanized steel

Damper Blades: 18-gage galvanized steel

Damper Shaft: 1/2" Diam.

Table 3. Rectangular bypass dampers

Size W" x H" No. of Blades Shipping Weight

14 x 12 3 16 lbs

16 x 16 4 21 lbs

20 x 20 4 29 lbs

30 x 20 4 40 lbs

61719 lbs

81721 lbs

10 17 22 lbs

12 17 23 lbs

14 17 25 lbs

16 17 27 lbs

VAV-SVN04B-EN 5