What a crankcase heater switch do?

A crankcase heater switch controls the operation of a heater installed in the crankcase of a refrigeration or air conditioning system. Its primary function is to prevent the accumulation of refrigerant in the compressor oil during low-temperature conditions, which can lead to compressor damage. By activating the heater, the switch ensures that the oil remains warm and prevents refrigerant from mixing with it, promoting efficient system operation and longevity.