Insufficient Cooling Action (Cont)

TM5-4120-383-14

Table 5-1.

TROUBLESHOOTING-Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Check area near condenser guard and fresh air inlet

Step 5.

for heat hource over 120F (40C).

Remove heat source.

Check sight glass after operating unit for 15

Step 6.

minutes with TEMPERATURE SELECTOR switch in maximum

COOLER position. Center should be bubble free and

green.

If charge is low add refrigerant.

(See para

Bubbles may also be caused by clogged

Use great care to avoid contact with liquid

refrigerant or refrigerant gas being

discharged from any container under pressure.

Sudden and irreversible tissue damage can

result from freezing.

Wear thermal protective gloves and a face

protector or safety glasses in any situation

where skin or eye contact is possible.

Prevent contact of refrigerant gas with flame

or hot metal surfaces.

Heat causes the refrigerant to break down and

form carbonyl chloride (phosgene), a highly

toxic and corrosive gas.

Check for refrigerant leaks.

Step 7.

Repair or change defective part.

High voltage can kill.

Check solenoid valves L1 and L2.

Step 8.

Repair or replace if defective.

5-8