Crankcase heater can protect the compressor from liquid slugging and insufficient lubricity.
We are always confused that why the refrigeration factory asks us to keep the power more than 4 hours when the unit is first started and or without electricity long time.
Because, during the shut-off periods, there are some refrigerant can mix with the oil. It will be liquid slugging and reduce lubricity in the next start. So, we add a heater in the crankcase. Then, we can warm up the oil to separate the refrigerant and oil by keeping the power for more than 4 hours.
The heater is important under the following conditions:
1. The compressor is during longer shut-off periods.
2.The compressor surrounding temperature less than 10C.
3. The way of supply oil is the oil pump.
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