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.
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.
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.
Table of Contents General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Damper Descriptions & Actuator Specifications . . . . . . . . . . . . . . . . . . . . . . . . 5 Round Dampers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Round bypass dampers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Round zone dampers . . . . . . . . . . . . . . . . . . . . . .
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.
General Rectangular Zone Damper Sheet Metal Box: 22-gage galvanized steel Length: 16" Damper Frame: 18-gage galvanized steel Damper Blades: 18-gage galvanized steel Crank Bearings: Glass filled Nylon Damper Shaft: 1/2" Diam. Table 4. Rectangular zone dampers Size H" x W" No.
General 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. 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.
Installation Installing the Communicating Sensor/Bypass Control WARNING Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury. The communicating sensor/bypass control is located between the supply fan and the bypass damper in the least turbulent location possible.
Installation Connect the Communicating Sensor/Bypass Control Wiring WARNING Proper Field Wiring and Grounding Required! All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/ state electrical codes. Failure to follow code could result in death or serious injury.
Installation Figure 4. VariTrac damper installation IMPORTANT: Mounting screws must be 3" away from damper bend to avoid interference with rotating damper. Hard or Flex Duct Attach unit to hard duct using a minimum of four sheet metal screws Hard or Flex Duct Attach flex duct to unit using self-locking plastic tie strap. A screw & washer can be used to secure the tie-strap if required.
Installation Connect UCM Wiring WARNING Proper Field Wiring and Grounding Required! All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/ state electrical codes. Failure to follow code could result in death or serious injury.
Installation Table 5.
Installation Figure 5. Typical VariTrac Zone/Changeover Wiring Diagram. Damper Actuator Wiring To 24V Transformer R–CLOSE OPTIONAL FIELD INSTALLED OCCUPANCY SENSOR BK–OPEN 5. BL–HOT R (HOT) (TB1-1) 24 VAC) O (COMMON) (TB4-1) BIP GR (NC CONTACT) (TB1-1) 24VAC BK (RETURN) (TB1-2) GND Y NOT CONNECTED 8. 3RD STG. 2ND STG. TB1–2 GND TB1–1 TB4–1 J8 J9 J7 BIP 24V J3 D.D.C.\U.C.M.
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