12.2 Burnt-out compressor due to an insufficient refrigerant charge
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Question and answer for the field work
Example: Burnt-out compressor due to an insufficient refrigerant charge
Phenomenon
After commissioning, the alarm code “08” sometimes occurred and the compressors were burnt out after operating for two
months.
Cause
The refrigerant piping work was performed during the simmer season, The additional refrigerant was not sufficiently chargedf
from de discharge gas side.
This insufficient refrigerant charge resulted in the overheating of the discharge gas and the oil deterioration, which was finally
due to the separated operation despite the alarm code “08”.
Countermeasure
1. The compressor was replaced with a new compressor.
2. The correct refrigerant amount was charged according to the refrigerant piping length and the connected indoor units.
Remarks
Additional refrigerant charge: Open the liquid stop valves slightly when you charge the additional refrigerant from the check joint
of the liquid stop valves (the discharge gas side) during the cooling process. If the liquid stop valve is fully open, it is difficult to
charge the additional refrigerant. Do not charge the refrigerant from the gas stop valve.
12 Maintenance notes
349
SMGB0065 rev. 1 - 12/2010
12
