The crankcase heater is an electrical resistance element that keeps the compressor crankcase warm when the unit is not in operation or under specific conditions.
Why it is needed
In low temperatures, refrigerant can migrate toward the compressor and dissolve into the oil.
Risk at start-up
If a large amount of refrigerant is in the oil, it can cause foaming and inadequate lubrication during start-up.
When it operates
The activation logic varies by model and may be controlled automatically by the circuit board.
Important
Do not permanently disconnect the power supply of a unit in a cold environment without knowing the manufacturer's instructions.
