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8 - VENT DAMPER OPERATION
Figure 8 - Vent Damper Installation Figure 9 - Vent Damper Placement
Annually check vent damper and all fl ue product
carrying areas of appliance, with particular attention
given to deterioration from corrosion or other
sources. If you see corrosion or other deterioration,
contact your heating contractor for repairs. Check
vent damper operation as follows:
• When boiler is off, check vent damper positions
indicator points to closed position, Figure 10.
• Turn thermostat or controller up to call for heat and
check vent damper indicator points to open position.
• Turn thermostat or controller down again and check
damper position indicator returns to closed position.
Vent Damper Manual Operation
Vent damper may be placed in open position to
permit burner operation by using “HOLD DAMPER
OPEN” switch, located on damper controller.
Thermostat will control burner fi ring as before, while
damper will remain open. DO NOT turn damper
open manually or motor damage will result. Set
switch to “AUTOMATIC OPERATION” to close vent
damper during burner off cycle.
For further information, and vent damper
troubleshooting guide, refer to manual packaged with
vent damper.
Inspect vent damper at least once a year by a
qualifi ed service technician.
Figure 10 - Vent Damper Position Indicator