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![]() TM 55-1905-223-24-17
SYMPTOM INDEX - CONT
Troubleshooting
Procedure
High crankcase temperature (compressor
Item 8
extremely hot)
High operating head (discharge) pressure
Item 3
High suction pressure
Item 5
Hissing sound
Item 16
Low operating head (discharge) pressure
Item 4
Lower than normal suction pressure
Item 6
No cooling - blower does not run
Item 17
No cooling - blower running
Item 18
Partial or insufficient cooling - blower
Item 19
running
Table 4-1 lists the common fault conditions that may be found during operation or maintenance of the
equipment. Look for causes and do corrective actions in the order listed. This manual cannot list every
symptom that may show up, and it cannot list all of the possible causes and corrective actions. If a symptom is
not listed, or if it keeps up after you have performed the corrective actions, notify your supervisor.
Table 4-1. Troubleshooting
Malfunction
Test or Inspection
Corrective Action
VENTILATION (SUPPLY AND EXHAUST FANS)
1.
Excessive noise or vibration.
STEP 1.
Impeller out of balance, worn, or corroded.
Replace impeller (paragraphs 4-11 through 4-13).
STEP 2.
Check for worn or defective bearings.
Replace bearings as required (paragraph 4-12).
2.
Fan does not operate.
STEP 1.
Check for defective fan motor.
Replace fan motor (paragraph 4-12 or 4-13).
STEP 2.
Check for defective controller.
Turn power on. If motor does not start, see TM 55-1905-223-24-18 for maintenance of
controller.
4-3
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