Control Assembly: Service and Repair

DAMPER CONTROL MOTOR ASSEMBLY

REMOVAL AND INSTALLATION

INSPECTION





INSPECTION OF INSIDE/OUTSIDE-AIR DAMPER MOTOR ASSEMBLY
Check that the motor rotates when battery voltage is applied to the connector on the motor assembly side. Check also that the motor rotates in the backward direction when polarity is changed.

CAUTION
1. Cut off the voltage when the damper is in the RECIRCULATION or FRESH position.
2. Cut off the voltage if the motor does not turn when battery voltage is applied.





INSPECTION OF AIR MIX DAMPER MOTOR
Check that the motor rotates when battery voltage is applied across terminals (2) and (6) of motor assembly side connector. Check also that the motor turns in the backward direction when polarity is changed.

CAUTION
1. Cut off the voltage when the damper is in the MAX. HOT or MAX. COOL position.
2. Cut off the voltage if the motor does not turn when battery voltage is applied.





INSPECTION OF AIR MIX DAMPER POTENTIOMETER
Connect a circuit tester across terminals (3) and (4) the motor assembly connector and check that resistance gradually changes as the damper is moved from MAX. HOT to MAX. COOL position.

Standard value
MAX. HOT: Approx. 0.2 K Ohms
MAX. COOL: Approx. 4.9 K Ohms





INSPECTION OF OUTLET SELECTOR DAMPER MOTOR
Check that the motor turns when battery voltage is applied across terminals (2) and (6) of the motor assembly connector. Check also that the motor turns in the backward direction when polarity is changed.

CAUTION
1. Cut off the voltage when the damper is in the DEF. or FACE position.
2. Cut off the voltage if the motor does not turn when battery voltage is applied.





INSPECTION OF OUTLET SELECTOR DAMPER POTENTIOMETER
Connect a circuit tester across terminals (3) and (4) of the motor assembly connector and check that resistance gradually changes as the damper is moved from DEF. to FACE position.

Standard value
DEF. position: Approx. 2.0 K Ohms
FACE position: Approx. 4.3 K Ohms