Air present in refrigeration system

Condition: Insufficient cooling

NOTE : These gauge indications are shown when the refrigeration system has been opened and the refrigerant charged without vacuum purging.

I01392

Symptom seen in refrigeration system

Probable cause

Diagnosis

Remedy

♦Pressure too high on both low and high pressure sides ♦The low pressure piping hot to touch

♦Bubbles seen in sight glass

Air entered in refrigeration system

♦Air present in refrigeration system

♦Insufficient vacuum purging

(1) Check compressor oil to see if it is dirty or insufficient

(2) Evacuate air and charge new refrigerant

(8) Expansion valve improperly.

Symptom seen in refrigeration system

Probable cause

Diagnosis

Remedy

♦Pressure too high on both low and high pressure sides ♦Frost or large amount of dew on piping on low pressure side

Trouble in expansion valve

♦Excessive refrigerant in low pressure piping ♦Expansion valve opened too wide

Check expansion valve, and replace if defective

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