MCAC-VTSM-2015-09 R410A All DC Inverter V4+S Series 60Hz
Troubleshooting 155
Step 3: Replace the compressor
Note:
1. Before removing the oil, shake the compressor, oil separator and gas-liquid separator first, so as to not allow
impurities to settle at the bottom of the tank.
2. If the oil of one compressor is clean, there’s no need to check the oil of the other compressor. If the oil of one
compressor has gone bad, it is necessary to check the oil of the other compressor. If all the oil of an outdoor
unit needs to be replaced, after adding oil to the compressors, the rest oil should be charged to the gas-liquid
separator.
3. Add oil to the compressor from the discharge pipe.
Pour out some oil from each compressor; check the
quality of the oil
Remove all oil from the compressor, oil separator
and gas-liquid separator
Check the filter between the ball valve and the
4-way valve
Clean the filter with nitrogen, or replace the filter
Replace the damaged compressor
Replace the oil separator and gas-liquid separator
Add clean oil to the new compressor, and gas-liquid
separator
Weld the pipes, vacuum drying the system and
recharge refrigerant
Make sure all the wire connections are correct,
restart the system
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