13
VENT DAMPER OPERATION
Figure 7
Figure 8
For safe, efficient operation, vent damper and all flue
product carrying areas of appliance must be checked
annually, 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. See Figure 9.
• Turn thermostat or controller up to call for heat and
check vent damper indicator points to open position.
See Figure 9.
• 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 firing 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
qualified service technician.
Figure 9 - Vent Damper Position Indicator
