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 TM 5-4120-352-14
Table 5-1. Troubletthooting (cont`d)
Malfunction
Test or Inspection
Corrective Action
4. INSUFFICIENT COOLING
Test for low refrigerant charge.
Step 1.
Add refrigerant (para 6-3).
Check for indications of a clogged dehydrator.
Step 2.
Replace clogged dehydrator (para 4-43).
Check for indications of a defective pressure regulator valve.
Step 3.
Replace defective valve (para 5-30).
Check for indications of air in system.
Step 4.
Purge and charge system (fig. 6-1).
Check for indications of a defective thermal expansion valve.
Step 5.
Replace defective valve (para 5-28).
Check for indications of defective solenoid valve.
Step 6.
Replace defective solenoid valve (para 5-27).
Check for indications of defective quench valve.
Step 7.
Replace defective valve (para 5-29).
5. LOW SUCTION PRESSURE
Check for indications of a clogged dehydrator.
Step 1.
Replace clogged dehydrator (para 5-24).
Check for indications of a defective thermal expansion valve.
Step 2.
Replace defective valve (para 5-28).
Check for indications of a defective quench valve.
Step 3.
Replace defective valve (para 5-29).
6. LOW DISCHARGE PRESSURE
Check to see if compressor is not pumping due to defect.
Step 1.
Replace defective compressor (para 5-17).
Check to see if HIGH LOW condenser fan thermostatic switch is defective.
Step 2.
Replace defective switch (para 4-39).
5-4
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