|
| |
ARMY TM 9-4120-381-14
NAVY EE-000- CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
Table 4-2. Unit Maintenance Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6. EVAPORATOR FAN MOTOR (B1) DOES NOT OPERATE - Continued.
Step 4. Check operation of MODE SELECT SWITCH (Si).
Inspect switch (para 4-56). Replace switch, if defective.
7. CONDENSER FAN MOTOR (B3) DOES NOT OPERATE.
WARNING
Disconnect input power before performing internal electrical troubleshooting.
Voltages used can be deadly.
Step 1. Using wiring diagram (see Figure FO-3), check electrical connections and individual wires for tightness.
Tighten or replace electrical connectors, or repair damaged wires.
Step 2. Check operation of fan motor contactor (K9).
Test contactor (para 4-51). Replace contactor, if defective.
Step 3. Check operation of condenser fan motor (B3).
Test motor (para 4-76). Replace motor, if defective.
Step 4. Check operation of MODE SELECT SWITCH (S1).
Inspect switch (para 4-56). Replace switch, if defective.
8. EXCESSIVE NOISE.
Step 1. Examine noises heard during compressor operation.
CAUTION
If a knocking or hammering sound Is heard when compressor starts, turn MODE
SELECT SWITCH to OFF, immediately. Such noise is usually caused by liquid re-
frigerant in compressor, which can seriously damage or destroy compressor.
a. If knocking or hammering sound is heard when compressor starts, turn MODE SELECT SWITCH to
OFF IMMEDIATELY.
b. Isolate source of noise as near as possible, both by ear and touch. Listen and feel at both front and
back of cabinet.
4-26
|
