AIR CONDITIONING - CONT - TM-55-1905-223-24-170055

TM 55-1905-223-24-17

Table 2-2. Troubleshooting - CONT

Malfunction

Test or Inspection

Corrective Action

AIR CONDITIONING - CONT

20.

Compressor makes noises.

STEP 1.

Check for loose mounting bolts.

Secure all mounting bolts until snug.

STEP 2.

Check for slugging due to refrigerant floodback (on expansion valve equipped unit; A/C-2;

accommodations).

Make sure the thermal bulb on the expansion valve is firmly attached to the suction line.

Correct as required.

STEP 3.

Check for hydraulic knock due to excess oil in circulation.

Refer to Item 11 of this table.

21.

Piping rattles.

STEP 1.

Check for improper or loose supports.

Correct as required.

22.

No cooling - blower does not run.

STEP 1.

Check to see if fan switch is in OFF position.

Turn switch ON.

STEP 2.

Check to see if circuit breaker OFF or tripped.

Re-set breaker. If breaker trips again, locate the problem and correct as required.

b. Check for defective circuit breaker and replace as required (TM 55-1905-223-24-18).

STEP 3.

Check for defective wiring, compressor, or electrical components.

Refer to Item 15 of this table.

23.

No cooling - blower running.

STEP 1.

Check to see if thermostat is set to FAN ON, but selector switch set to OFF.

Set HEAT-OFF-COOL switch on thermostat to COOL.

STEP 2.

Check to see if thermostat is set too high.

Adjust thermostat to a lower temperature setting.

STEP 3.

Check for defective thermostat.

Replace thermostat (TM 55-1905-223-24-18).

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