TM 9-4120-402-14
4-47. EVAPORATOR AND CONDENSER FAN MOTOR (B2) AND CONDENSER FAN.
This task covers:
a. Test
b. Inspect
c. Remove
d. Clean
e. Install
INITIAL SETUP
Tools
Equipment Conditions:
Refrigeration Unit Service Tool Kit
CAUTION
Appendix B, item 1
Scrub Brush
Use disconnect switch (NOT POWER
Appendix B, item 2
CABLE) to disconnect power to unit.
Damage to cable connector pins will
result if cable is used.
Socket Head Key
Appendix B, item 13
Disconnect power at power source.
Materials/Parts
Remove rear panel (para 4-22).
Evaporator and Condenser Fan Motor
Remove conditioned air filter (para 4-23).
Condenser Fan
Remove evaporator fan (para 4-46).
Rags
Appendix E, item 13
Personnel Required
Dry Cleaning Solvent
Two
Appendix E, item 3
Detergent
Appendix E, item 15
a. Test
(1) Check motor rotational freedom by spinning fan. If there is any stiffness or binding, notify supervisor.
(2) Check motor bearings for shaft end play. If there is excessive end play, notify supervisor.
(3) Check motor windings as follows: (a) Disconnect motor cable from connector (1).
(b) Using multimeter set on lowest OHMS scale, check continuity between pins A and B, A and C, and B and C in
motor connector (1). If there is no continuity between any pair of pins, the motor winding is open. Replace
motor.
(c) Using multimeter set on highest OHMS scale, check continuity between pins A, B, and C in motor connector
(1) and motor housing. A reading of less than 500,000 ohms indicates insulation failure. Replace motor.
NOTE
If all of the above tests are satisfactory, but the motor will still not operate properly, notify supervisor.
4-135
