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TM 5-4120-361-14
Table 5-1.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7.
LOW SUCTION
Step 2.
Step 3.
8.
HIGH SUCTION PRESSURE (See Table 6-1)
AND DISCHARGE PRESSURE - Continued
Check for indications of defective thermal expansion valve.
Replace valve (para 5-28).
Check for indications of defective quench valve.
Replace valve (para 5-29).
Step 1.
Check for indications of defective thermal expansion valve.
Replace valve (para 5-28).
Step 2.
Check for indications of defective quench valve.
Replace valve (para 5-29).
9.
HIGH HEAD PRESSURE (See Table 6-1)
Step 1.
Check to see if condenser coil is dirty.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Clean coil.
Check condenser coil temperature gradient for indications of
refrigerant overcharge.
Discharge refrigerant (fig. 6-1) while observing head pressure
and sight glass.
Inspect or test condenser fan motor for defective operation.
Repair motor (para 6-8).
Inspect condenser louvers and actuating mechanism for correct
adjustment and proper operation.
Adjust and clean as necessary.
Replace in operative components
(para 5-20).
Check for indications of defective quench valve.
Replace defective valve (para 5-29).
Check to see if the compressor is defective.
Replace defective compressor (para 5-16).
5-5
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