Field Controls (GVD) gas vent damper was developed to reduce off cycle venting losses through boilers and draft hoods. When the boiler is in a standby mode, heat escapes up the chimney. The heat comes from the boiler and the conditioned space. To significantly reduce these losses, install a Field Controls Gas Vent Damper. The damper is installed in the vent as close to the draft hood as practical. When properly installed, the damper opens before the burner fires, and closes after the burner shuts off. The electrical circuits in this product are designed not to override the existing limit and safety controls of the boiler.

The plug is installed only if the appliance is equipped with an intermittent or direct ignition system. Failure to follow these instructions can cause odor problems and minor property damage due to moisture. Do not install on standing pilot systems.

When the boiler receives a call for heat, the damper rotates to the open position before the burner circuit is energized. If the damper does not rotate to the open position, the burner circuit will not be energized. When properly installed, the electrical circuits in this product are designed not to override the existing limit and safety controls of the appliance.

WARNING: Before installing the vent damper:
1. Read this manual carefully and completely.
2. Be sure to follow all procedures and safety inspections.
3. Do not negate the action of any safety or operational controls.
4. The vent damper is not for retrofit in Canada.

For continued safe operation the appliance device combination should be inspected annually by a qualified service agency. It is recommended that the homeowner should have the vent system and the damper device examined annually for deterioration from corrosion or other sources. This inspection should be performed prior to and during each heating season.