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 TM 5-4120-369-14
Table 5-1.
Troubleshooting - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4.
INSUFFICIENT COOLING - Continued
Check idications of a defective pressure regulator valve.
Step 3.
Replace defective valve (paragraph 5-30).
Check for indications of air in system.
Step 4.
Purge and charge system (figures 6-1 and 6-2).
Check for indications of a defective thermal expansion valve.
Step 5.
Replace defective valve (paragraph 5-28).
Check for indications of defective solenoid valve.
Step 6.
Replace defective solenoid valve (paragraph 5-25).
Check for indications of defective quench valve.
Step 7.
Replace defective valve (paragraph 5-29) .
5.
LOW SUCTION PRESSURE (See Table 6-1)
Check for indications of a clogged dehydrator,
Step 1.
Replace clogged dehydrator (paragraph 5-24).
Step 2.
Check for indications of a defective thermal expansion valve.
Replace defective valve (paragraph 5-28) .
Step 3.
Check for indications of a defective quench valve,
Replace defective valve ( paragraph 5-29).
LOW DISCHARGE PRESSURE (See Table 6-1)
6.
Check to see
if compressor is not pumping due to defective compressor.
Step 1.
Replace defective compressor (paragraph 5-31).
Check to see if HIGH/LOW condenser fan thermostatic switch is defective.
Step 2.
Replace defective switch (paragraph 4-26).
7.
LOW SUCTION AND DISCHARGE PRESSURE (See Table 6-1)
Check for low refrigerant charge by inspecting sight glass for bubbles or
Step 1.
milky appearances. Also check for leaks.
Repair leaks and add refrigerant as necessary.
Step 2.
Check for indications of defective thermal expansion valve.
Replace valve (paragraph 5-28 ).
Check for indications of defective quench valve.
Step 3,
Replace valve (para 5-29).
5-4
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