Doors fully opened

Item

Symptom

Amount of refrigerant

Remedy

1

Bubbles appear in sight glass

Insufficient*

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

(2) Add refrigerant until bubbles disappear

2

No bubbles appear in sight glass

None, sufficient or too much

Refer to item 3 and 4

3

No temperature difference between compressor inlet and outlet

Empty or nearly empty

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

(2) Add refrigerant until bubbles disappear

4

Temperature between compressor inlet and outlet is noticeably different

Correct or too much

Refer to items 5 and 6

5

Immediately after air conditioning system is turned off, refrigerant in sight glass stays clear

Too much

(1) Discharge refrigerant

(2) Evacuate air and charge proper amount of purified refrigerant

6

When air conditioning system is turned off, refrigerant foams and then stays clear

Correct

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