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Figure 8 - Vent Damper Installation
Annually check vent damper and all flue 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 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.
7 - VENT DAMPER OPERATION
Figure 9 - Vent Damper Placement
For further information, and vent damper troubleshooting
guide, refer to manual packaged with vent damper and
Appendix B of this manual.
Inspect vent damper at least once a year by a
qualified service technician.
Figure 10 - Vent Damper Position Indicator
17
PN 240013090 REV. C [10/01/2021]
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