Table 4-1. Troubleshooting - TM-55-1905-223-24-170210

TM 55-1905-223-24-17

SYMPTOM INDEX - CONT

Troubleshooting

Procedure

(Table 4-1)

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)

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).

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