TM 9-4120-388-14
Table 5-1. Troubleshooting for Direct Support Maintenance - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. INSUFFICIENT COOLING ACTION - Continued.
Step 6. Check for refrigerant leaks. (See para 5-10.)
Repair or change defective part.
High voltage can kill.
Step 7. Check solenoid valves L1 and L2. (See para 5-19.)
Repair or replace if defective. (See para 5-19.)
Step 8. Check pressure regulator valve. (See para 5-25.)
Replace if defective. (See para 5-25.)
Step 9. Check expansion valve for proper operation. (See para 5-23.)
Replace if defective. (See para 5-23.)
Step 10. Check quench valve for proper operation. (See para 5-20.)
Replace if defective. (See para 5-20.)
NOTE
To determine if unit is operating at proper capacity (output) in the COOLING mode, refer
to Table 5-3.
4. REFRIGERANT SYSTEM CONTINUOUSLY LOSING REFRIGERANT.
Use great care to avoid contact with Iiquid refrigerant or refrigerant gas being dis-
charged 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 situa-
tion where skin or eye contact is possible.
Prevent contact of refrigerant gas with flame or hot metal surfaces.
Heat causes the refrigerant to breakdown and form carbonyl chloride (phosgene),
a highly toxic and corrosive gas.
5-4
