TM 9-4120-385-14
Table 5-1. TROUBLESHOOTING FOR DIRECT SUPPORT MAINTENANCE Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE
ACTION
WARNING
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.
Step 3. Check head pressure (high pressure side). Refer to Paragraph 5-4.
a. If pressure is too high, check HIGH PRESSURE cutout switch and replace if defective. Refer to
b. If pressure is excessive and sight glass is clear, release excess refrigerant. Refer to Paragraph 5-5.
Step 4. Check if LOW PRESSURE cutoff switch RESET is out.
Push LOW PRESSURE switch to RESET.
Step 5. Check head pressure (low pressure side). Refer to Paragraph 5-4.
Step 6. Check quench valve. Refer to Paragraph 5-14.
Step 7. Check compressor motor thermo cutoff switch. Refer to Paragraph 5-11.
Replace compressor if cutoff switch is defective. Refer to Paragraph 5-11.
