69-1088B
5
D896 AUTOMATIC VENT DAMPER
SETTINGS
The service switch operates in normal (NORM) or service
(SERV) modes. See Fig. 4.
NORM—D896 opens on a call for heat and closes at
the end of the heating cycle.
SERV—D896 remains open at the end of a call for
heat. The switch must be in the SERV position
before manually opening the damper.
CHECKOUT
Heating
1. Turn on the power supply.
2. If using a thermostat, set the heat anticipator at .13A
plus the current draw for the control module and the
system.
3. Set the thermostat or controller 10
°
F (6
°
C) above
the room temperature to call for heat.
4. Check that the D896 CALL FOR HEAT and
IGNITION GAS PWR LEDs are lit and that the
damper opens before the gas valve opens and the
pilot or main burner ignites. See Fig. 8.
NOTE:
If a boiler gas control is sequenced by the
Aquastat® controller, make sure that the
damper opens prior to the opening of the
gas control.
5. Turn the thermostat or controller 10
°
F (6
°
C) below
the room temperature. Make sure the LEDs turn off
and the D896 closes.
6. Cycle the heating system at least three times, using
the thermostat or controller to ensure the system is
operating safely.
THE AIR DUCT IS CLOSED WHEN THE
INDICATOR POINTS PERPENDICULAR TO
THE DIRECTION OF THE AIR DUCT
THE AIR DUCT IS OPEN WHEN
THE INDICATOR POINTS IN THE
DIRECTION OF THE AIR DUCT
M3431
Fig. 8. Determining damper position.
Cooling
CAUTION
Damage to air condtioner condenser possible.
Do not operate cooling if outdoor temperature is
below 50
°
F (10
°
C).
1. Set the thermostat or controller to COOL. Move the
setpoint 10
°
F (6
°
C) below the room temperature.
2. Make sure the cooling system operates.
3. Check that the D896 is in the closed position. See
Fig. 8.
4. Return the thermostat or controller to the desired
settings.
NOTE TO INSTALLER:
Explain to the homeowner that a yearly inspec-
tion by a trained, experienced service technician
is necessary for safe, efficient operation of the
vent damper and heating system. The home-
owner should check for deterioration from
corrosion or other sources between service
technician calls.
TROUBLESHOOTING
WARNING
Fire or explosion hazard. Can cause property
damage, severe injury or death.
Explosion or carbon monoxide poisoning possible.
Never apply a jumper across or short gas control
terminals or wires. This can force the D896 to
remain closed and cause an explosion.
