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TM 5-4120-259-15
44. Faulty Blower
Probable Cause
Unbalanced or corroded fans.
Defective fan motor.
45. Faulty Receiver
Probable Cause
Receiver develops leaks.
Relief valve defective.
46. Suction Pressure Below Normal
Probable Cause
Restricted liquid line or expansion valve.
Insufficient refrigerant charge.
47. Suction Pressure too High
Probable Cause
Overfeeding of expansion valve.
48. Defective Motor Contactor
Probable Cause
Circuit breaker defective.
Holding coil defective.
49. Dampers Fail
Probable Cause
Damper control cable defective.
Control linkage binder defective.
Damper blades binding in frame.
Possible Remedy
Replace (para 57 and 58).
Replace motor (para 57 and 58).
Possible Remedy
Repair leaks or replace receiver (fig. 31).
Replace valve (fig. 31).
Possible Remedy
Pump down, examine, and correct. Replace expansion
valve if necessary (para 84).
Check for refrigerant shortage. Recharge if necessary
(para 97).
Possible Remedy
Regulate expansion valve, and check bulb attachment.
Replace if necessary (para 84).
Possible Remedy
Replace circuit breaker (para 62).
Replace Motor Contactor (para 63).
Possible Remedy
Replace cable (para 54).
Check damper control linkage. Repair or replace
as needed.
Free blades or replace (para 53).
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