Insufficient cooling

Symptom seen in refrigeration system

Probable cause

Diagnosis

Remedy

♦Pressure low on both low and high pressure sides ♦Bubbles seen in sight glass continuously

♦Insufficient cooling performance

Gas leakage at some place in refrigeration system

♦Insufficient refrigerant in system ♦Refrigerant leaking

(1) Check for gas leakage with gas leak detector and repair if necessary

(2) Charge proper amount of refrigerant

(3) If indicated pressure value is near 0 when connected to gauge, create the vacuum after inspecting and repairing the location of the leak

(4) Poor circulation of refrigerant.

Symptom seen in refrigeration system

Probable cause

Diagnosis

Remedy

♦Pressure low in both low and high pressure sides

♦Frost on tube from condenser to unit

Refrigerant flow obstructed by dirt in condenser

condenser clogged

Replace condenser

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