C/US CSA Certified

• Less harness Dual safety switches allow the burner to fire only when the damper is in the open position This unit will not interfere with existing appliance safety controls, when properly installed The field vent damper works automatically to allow natural draft during appliance operation while preventing residual appliance heat and conditioned air from escaping during off cycles It also prevents the infiltration of cold air during down drafts Damper operation - power opens in 15 sec, power closes in 15 sec, power is off at damper motor when it is at rest Hold open switch allows damper to be placed in an open position and taken out of service to assist with trouble shooting appliance problems Keyed wiring harness connector plug installs only one way, preventing incorrect wiring connection Stainless steel construction provides superior corrosion-resistance

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.