10
VENT DAMPER OPERATION
FIG. 9 FIG. 10
For safe, effi cient operation, the vent damper and all
fl ue product carrying areas of the appliance must be
checked annually by you, 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:
1. When the boiler is off, check that the vent damper
positions indicator points to the closed position, Fig.
11.
2. Turn the thermostat or controller up to call for
heat and check the vent damper indicator points
to the open position, Fig. 11.
3. Turn the thermostat or controller down again and
check that the damper position indicator returns
to the closed position.
MANUAL OPERATION OF THE VENT DAMPER
The vent damper may be placed in the open position to
permit burner operation by using the “HOLD DAMPER
OPEN” switch, located on the damper controller. The
thermostat will control the burner fi ring as before, while
the 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 for a vent damper
troubleshooting guide, refer to the manual that was
packaged with the vent damper.
The vent damper must be inspected at least once a
year by a trained, experienced service technician.
The name of the person who originally installed
your vent damper is shown on the installation
label.
FIG. 11 VENT DAMPER POSITION INDICATOR
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