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TM 5-4120-361-14
Table 5-1.
Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4.
INSUFFICIENT COOLING - Continued
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
5.
LOW SUCTION
Step 1.
Step 2.
Step 3.
Check for indications of a clogged dehydrator.
Replace clogged dehydrator (para 5-24).
Check for indications of a defective pressure regulator valve.
Replace defective valve (para 5-30).
Check for indications of air in system.
Purge and charge system (fig. 6-1 and 6-2).
Check for indications of a defective thermal expansion valve.
Replace defective valve (para 5-28).
Check for indications of defective solenoid valve.
Replace defective solenoid valve (para 5-25).
Check for indications of defective quench valve.
Replace defective valve (para 5-29).
PRESSURE (See Table 6-1)
Check for indications of a
Replace clogged dehydrator
Check for indications of a
clogged dehydrator.
(para 5-24).
defective thermal expansion valve.
Replace defective valve (para 5-28).
Check for indications of a defective quench valve.
Replace defective valve (para 5-29).
6.
LOW DISCHARGE PRESSURE (See Table 6-1)
Step 1.
Step 2.
7.
LOW SUCTION
Step 1.
Check to see if compressor is not pumping due to defect.
Check to see if HIGH/LOW condenser fan thermostatic switch is
defective.
Replace defective switch (para 4-26).
AND DISCHARGE PRESSURE (See Table 6-1)
Check for low refrigerant charge by inspecting sight glass for
bubbles or milky appearances.
Also check system for leaks.
Repair leaks and add refrigerant as necessary.
5-4
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