Rheem 136-1826, Operating And Installation Manual, Page: 17 / 55

VENT DAMPER
NORMAL OPERATION SUMMARY
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 dete-
rioration from corrosion or other sources. Check vent
damper operation as follows:
1. When the furnace or heater is off, check that the vent
damper position indicator points to the closed posi-
tion, Fig. 4.
2. Turn the thermostat or controller up to call for heat
and check that the vent damper indicator points to
the open position, Fig. 4.
3. Turn the thermostat or controller down again and
check that the vent damper position indicator re-
turns to the closed position.
DAMPER OPEN DAMPER CLOSED
FIG.4-VENT DAMPER POSITION INDICATOR
SHOWING OPEN & CLOSED POSITIONS.
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 system. If the vent damper is installed on an intermittent Pilot
or Direct Spark Ignition equipped system, the energy savings of the vent damper can be improved by plugging the
hole in the vent damper blade using the knockout plug, Part No 105612R, provided in the parts envelope.
DO NOT plug the hole if installing the vent damper on a continuous pilot system as this will create a hazardous
condition.
THE VENT DAMPER MUST BE INSPECTED AT LEAST
ONCE A YEAR BY A TRAINED, EXPERIENCED SER-
VICE TECHNICIAN.. THE NAME OF THE PERSON
WHO ORIGINALLY INSTALLED YOUR VENT DAMPER
IS SHOWN ON THE INSTALLATION LABEL. DAMPER
MUST BE IN OPEN POSITION WHEN HEATER MAIN
BURNERS ARE OPERATING.
INSTALLING THE VENT DAMPER IN HORIZONTAL &
VERTICAL VENTS.
D80B 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 EXPLOSION OR CARBON MONOXIDE
POISONING, COULD RESULT.
17
Damper position
indicator