AIR CONDITIONING - CONT - TM-55-1905-223-24-170056

TM 55-1905-223-24-17

Table 2-2. Troubleshooting-CONT

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

AIR CONDITIONING-CONT

STEP 4. Check for high head (discharge pressure).

Refer to Item 8 of this table.

STEP 5. Check for defective compressor.

Refer to Item 15 of this table.

24.

Partial or insufficient cooling-blower running.

STEP 1. Check to see if thermostat is set too high.

Adjust thermostat to a lower temperature setting.

STEP 2. Check for dirty air filter.

Replace as required (paragraph 2-33 or 2-34).

STEP 3. Check for defective fan/blower.

Refer to Item 5 of this table.

STEP 4. Check for insufficient air flow through cooling coil (evaporator).

Clean dirt from coil.

STEP 5. Check for high head (discharge) pressure.

Refer to Item 8 of this table.

STEP 6. Check to see if electric heat element is ON in a duct heater.

Check for defective heat contactor. Replace as required (appropriate paragraph 2-18 thru 2-

22).

25.

Water leaking from unit.

STEP 1. Check for loose water line or drain connection or hole in line.

Correct as required.

ALL HVAC EQUIPMENT

26.

Unit gives electrical shock.

STEP 1. Check for grounded electrical circuit.

Check equipment and wiring to determine what is grounded. Repair or replace the equipment

as required.

2-27