Midea Mini C Series Service Manual page 22

Mini C Series VRF 50/60Hz
3 Standby Control
3.1 Crankcase Heater Control
The crankcase heater is used to prevent refrigerant from mixing with compressor oil when the compressor is stopped. The
crankcase heater is controlled according to outdoor ambient temperature and the compressor on/off state. When the
outdoor ambient temperature is above 3°C or the compressor is running, the crankcase heater is off; when the outdoor
ambient temperature is at or below 3°C and either the compressor has been stopped for more than 3 hours or the unit has
just been powered-on (either manually or when the power has returned following a power outage), the crankcase heater
turns on.
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