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Mounting
On vertical vents, the vent damper may be mounted
with the actuator in any position. On horizontal vents,
do not mount the actuator either directly above or
directly below the vent pipe; mount the vent damper
actuator to the side of the vent.
The vent damper is set up for a continuous pilot sys-
tem. If the vent damper is installed on a system with an
Intermittent Pilot or Hot Surface Ignition, the energy
savings of the vent damper can be improved by plug-
ging the hole in the vent damper blade using the
knockout plug provided in the parts envelope.
Closed Position
Hole in Vent Damper Blade
Fig. 8: Vent Damper
DO NOT plug the hole if installing the vent damper on
a continuous pilot system as this will create a haz-
ardous condition.
Fig. 9: Installing The Vent Damper in Horizontal
& Vertical Vents
Fig. 10: D80D General Wiring Diagram
Install the vent damper to service only the single
appliance for which it is intended. If improperly
installed, a hazardous condition, such as an explo-
sion or carbon monoxide poisoning, could result.
Vent Damper Operation
For safe, efficient operation, the vent damper and all
flue-product-carrying areas of the appliance must be
checked annually, with particular attention given to
deterioration from corrosion or other sources.
Check vent damper operation as follows:
1. When the boiler is off, check that the vent damper
position indicator points to the closed position (see
Fig. 11).
Damper Position Indicator
Damper Open Damper Closed
Fig. 11: Vent Damper Position Indicator