5-1
FIELD WORK INSTRUCTION
5. FIELD WORK INSTRUCTION
5.1 Burnt-out Compressor due to Insufficient Refrigerant Charge
Question and Answer for Field Work
Example 1: Burnt-out Compressor due to Insufficient
Refrigerant Charge
[Phenomenon]
After commissioning, alarm code “08” sometimes occurred and compressors were burnt out after
2 month operation.
[Cause]
Refrigerant piping work was performed during summer season. Additional refrigerant was not
sufficiently charged from the discharge side.
This insufficient refrigerant charge resulted in discharge gas overheating and oil deterioration finally
due to separated operation despite “08” alarm.
[Countermeasure]
1. The compressor was replaced with a new one.
2. Correct refrigerant amount was charged according to refrigerant piping length and connected indoor
units.
[Remarks]
Additional Refrigerant Charging:
Open the liquid stop valve slightly when the additional refrigerant is charged from the check joint of
the liquid stop valve (discharge side) during the cooling operation. If the liquid valve is fully open, it is
difficult to charge the additional refrigerant. Do not charge refrigerant from the gas stop valve.
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