4
SEQUENCE OF OPERATION
Cooling
When the room thermostat calls for cooling, the compressor
contactor no. 1 is energized to start compressor no. 1 and
outdoor--fan motor(s). The indoor--fan motor is energized and the
two--position damper moves to its field--adjusted position. On a
further call for cooling, compressor contactor no. 2 is energized
starting compressor no. 2 (7--1/2 to 12--1/2 ton units only). When
the indoor--fan motor is de--energized, the two position damper
moves to the fully closed position.
Heating
When the room thermostat calls for heating, the heating controls
are energized as described in the base unit installation, start--up and
service instructions. The indoor--fan motor is energized and the
two--position damper moves to the set position. When the
indoor--fan motor is de--energized, the two--position damper moves
to the fully closed position.
Ventilation (Continuous Fan)
The two--position damper remains at set position as long as the
indoor fan is energized. When the indoor fan is cycled off, the
two--position damper moves to the fully closed position.
Low Temperature Lockout (Optional)
If desired, a temperature lockout switch can be field installed to
over ride the damper signal and keep it closed if the outside air
temperature falls below a specified air temperature. The
recommended method is to use an outside air lockout switch or
thermostat to make/break the red wire on the damper actuator
harness.
NOTE
: In the event of a power failure or if the disconnect to the
unit is shut off, the damper will close due to the internal spring in
the actuator.
SERVICE
Once each heating or cooling season or as conditions require,
perform the following:
1. Inspect the two--position damper blade to ensure it is clean
and moves freely.
2. Visually verify that the damper opens upon a call for
cooling or heating and shuts when the unit is cycled off.
3. Inspect the actuator limit screw on the damper actuator.
Verify it is still in the desired position, and that it has not
slipped. Adjust as required.
WIRING DIAGRAM
RTU
PL-6
C07345
Fig. 8 -- CRTWOPOS010A00 and CRTWOPOS011A00 Wiring
Copyright 2007 CAC / BDP
D
7310 W. Morris St.
D
Indianapolis, IN 46231
Printed in U.S.A.
Edition Date: 11/07
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No:IIK---CRTWOPOS01---01
Replaces: 48_50--- 63SI and 48_50--- 64SI
