INSUFFICIENT COOLING. - TM-9-4120-430-140077

TM 9-4120-430-14

0013 00

FAULT PROCEDURE 2. INSUFFICIENT COOLING - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

INSUFFICIENT COOLING

Step 2.

Check liquid sight indicator level to see that refrigerant is colorless and clear. Yellow indicates

moisture in system. Milky or bubbly refrigerant indicates low level refrigerant charge.

Report condition to Direct Support Maintenance personnel.

Step 3.

Inspect condenser coil for dirt.

Clean coil with 25-30 psi (1.76-2.11 kg/cm2) compressed air.

Step 4.

Inspect evaporator air intake filter for dirt.

Clean filter.

Step 5.

Check for inoperative coil on liquid line solenoid valve.

a. Turn selector switch to OFF.

b. Turn circuit breaker to OFF.

c. Remove top cover (WP 0018 00).

d. Check wiring for loose connections and frayed wiring.

e. Remove coil from liquid line solenoid (WP 0032 00).

f. Turn on circuit breaker.

g. Turn selector switch to vent.

h. Check for magnetic field of coil.

i. Replace solenoid coil if no magnetic field is present (WP 0032 00).

Step 6.

Check for inoperative fan motor.

a. Check fan for operation by feeling for air flow from evaporator discharge louver.

b. Open fresh air damper and turn selector switch to vent and recheck for air flow.

c. If not air flow, turn unit off at remote control module and circuit breaker. Remove evaporator air

intake louver (WP 0020 00) and check for faulty evaporator motor bearings. Use TEST

procedure steps of WP 0035 00.

FAULT PROCEDURE 3. COMPRESSOR WILL NOT START.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

COMPRESSOR WILL NOT START

WARNING

Ensure the power source is disconnected.

Step 1.

Make sure that circuit breaker or selector switch is properly set.

Reset controls properly.

0013 00-3