TM 9-4120-408-14
Table 5-1. Direct Support Troubleshooting Table. (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2. Refer to TM 9-2320-280-34 and test compressor.
Refer to applicable technical manual and replace damaged or defective compressor.
Step 3. Refer to wiring diagrams Figures H-1, H-2, and H-3 and inspect/test wiring.
a. Ensure all connectors are securely connected.
b. Replace or repair damaged or defective wiring as required.
10. Excessively Noisy Operation.
CAUTION
If a knocking or hammering sound is heard when compressor starts, turn mode selector
switch to OFF, immediately. Such noise is usually caused by liquid refrigerant in compressor
which can seriously damage or destroy compressor. Notify your supervisor.
Step 1. Inspect condenser vane axial fans for damage and blade clearance (paragraph 5-7).
Step 2. Inspect evaporator fan assembly for damaged impeller, loose or missing mounting hardware, or
Step 3. Check all internal components of condenser assembly and evaporator assembly for looseness, vibration,
and security.
a. Tighten, adjust, and secure loose components as necessary.
b. If unit is still noisy, notify your supervisor.
5-5