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TM 55-1905-223-24-17
Table 3-1. Troubleshooting
Malfunction
Test or Inspection
Corrective Action
VENTILATION FANS (SUPPLY AND EXHAUST)
WARNING
Make sure a fan is not in a stalled condition before attempting
maintenance. Severe injury could result if fan operates while
being worked on.
3.
Excessive noise or vibration.
STEP 1
Check for impeller out of balance, worn, or corroded. Replace impeller or fan as required
(paragraph 3-17, 3-19, 3-21, 3-22, or 3-23 or 3-24).
STEP 2. Check for worn or defective bearings. Replace bearings as required (paragraphs 3-17
4.
Fan does not operate.
STEP 1
Check for defective fan motor. Replace fan motor (paragraph 3-18, 3-20, 3-21, 3-22, 3-23,
AIR CONDITIONING
5.
Higher than normal operating head (discharge) pressure.
STEP 1
Check to see if refrigerant is overcharged.
a. Remove excess refrigerant:
NOTE
Self-contained units are not equipped with discharge service
valve for attaching high pressure hoseline of portable gauge to
obtain discharge pressure.
A/C-1 and 3 are self-contained units.
(1) Shut down compressor and remove front cabinet panel for access to compressor.
3-4

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