Pr
o
-
C
Series
8
Supply/Exhaust Airflow Dampers
All PRO-C units have airfl ow dampers on the outdoor air
intake and exhaust air outlet that are fi eld adjustable.
To adjust the outside airfl ow damper, turn the unit off and
open the access panel. Locate the outside airfl ow damper
actuator inside the unit on the right side. Loosen the two
end stops
and
with a No. 2 Phillips head screwdriver.
Move the stops to the desired positions and retighten the
screws. To test the correct position of the stops, while
depressing the release button
on the actuator, move the
damper to the fully open and closed position. Readjust the
stops as necessary. The actuator will automatically open the
damper to the set position whenever the unit is running and
will close the damper to the set position when the remote
unit start/stop (by others) is off. Note, the actuator needs
power to close, therefore it is not recommended that the
unit be turned off by disconnecting the power to the unit.
This may leave the actuator in an open position, which may
not be desirable.
To adjust the exhaust airfl ow damper, turn the unit off
and remove the nut/bolt stops on both sides of exhaust
hood. Reposition the nut/bolt stops in the desired adjusting
holes and retighten. Be sure to use matching adjusting hole
on both sides of the exhaust hood. Readjust the stops as
necessary to obtain the desired airfl ow. The exhaust airfl ow
damper will automatically open to the set position when the
exhaust fan is on, and close when the exhaust fan is off.
2ELEASE"UTTON
%ND3TOP
%ND3TOP
PRO-C Unit
Adjusting Holes
Nut/Bolt Stop
Exhaust Damper
Exhaust Hood
Figure 6. Location of the outside air damper and actuator.
Figure 7. Diagram of exhaust hood damper.
