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TM 9-4120-389-14
Table 4-2. UNIT TROUBLESHOOTING-(cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
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.
Contact your supervisor and Direct Support Maintenance.
Step 1.
Isolate source of noise as near as possible, both by ear and touch.
Listen and feel at both front and back of cabinet.
Step 2.
Check fans for looseness or damage, and for rotational clearance.
Tighten loose fans or adjust rotational clearance, or replace
fans (See para. 4-26 and 4-32).
Step 3.
Check all internal components for looseness, vibration, and security.
Tighten, adjust, and secure as necessary.
4-60
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