Basic Installation

Pre-Installation Steps

1. Safety Inspection: Ensure all appliances are safe and working properly.

2. Unpacking: Inspect the GVD unit and verify all parts are included.

3. Wiring Preparation: Use 24VAC wiring, 18-gauge minimum.

Installation Procedure

1. Shut off gas and electricity to the appliance.

2. Install the GVD device after the appliance draft hood, as close to the draft hood as possible.

3. Ensure 6 inches of clearance from combustible materials.

4. Secure the GVD with sheet metal screws or pop rivets, ensuring fasteners do not obstruct the damper gate.

5. Install and connect the wiring harness as instructed in the wiring diagram.

6. Confirm the vent damper's position indicator is visible and accessible.

Electrical Wiring

• Follow appliance manufacturer instructions for locating the vent damper harness.

• Ensure all connections are secure and properly positioned away from heat sources.

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Order of Operation

1. Power On: Damper may be open or closed.

2. Call for Heat: Damper rotates to the open position.

3. During Combustion: Damper remains open throughout heating cycle.

4. End of Heating Cycle: Damper rotates to the closed position.

5. Non-Heating Cycle: Damper remains closed to prevent heat loss.

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Troubleshooting Guide

 

Terminal 4 - Black (Common) 24 Volt

Terminal 3 - Yellow ( End Switch Out) 24 Volt

Terminal 2 - Orange ( End Switch In) 24 Volt

Terminal 1- Brown ( Hot ) 24 Volt

No Power to Damper (Terminals 4 & 1)

• Possible Causes:

  • Tripped limit control

  • Blown fuse or circuit breaker

  • Loose or disconnected wiring

  • Damper harness unplugged

• Solutions:

  • Reset limit control or breaker

  • Replace fuse

  • Tighten or repair wiring connections

  • Plug in damper harness

No Power to Damper (Terminals 4 & 2) with Power at 4 & 1

• Possible Causes:

  • Thermostat not calling for heat

  • Faulty heat anticipator or wiring

  • Tripped limit control or blocked vent switch

• Solutions:

  • Adjust thermostat

  • Replace thermostat or heat anticipator

  • Reset limit control or vent switch

Power at Terminals 4 & 1, 4 & 2, Damper Open, No Combustion

• Possible Causes:

  • Gas supply off

  • Loose wiring connection

  • Defective appliance component

• Solutions:

  • Open gas valve

  • Tighten or repair wiring connections

  • Replace faulty appliance component

Damper Rotates Continuously

• Possible Causes:

  • Defective damper motor

• Solution:

  • Replace damper motor assembly

Damper Stuck Closed

• Possible Causes:

  • Obstruction in damper gate

  • Bent or damaged vent pipe

• Solutions:

  • Clear obstruction

  • Repair or replace vent pipe

Troubleshooting Using a Jumper Wire

1. Ensure the damper is in the open position.

2. Place a jumper wire between Terminals 2 & 3.

3. If the appliance fires, remove the jumper and plug the damper harness back in.

4. If the appliance does not fire, replace the damper motor assembly.

5. If a replacement motor assembly is not available, place the service switch in the hold open position to allow temporary heating operation.

 

See below for wire references: