Daikin-McQuay 330388501 Crankcase Heater

The Daikin-McQuay 330388501 Crankcase Heater is an electrical appliance in its basic sense that is used to regulate the temperature inside the HVAC compressor crankcase. This heater is designed to produce heat when the compressor is off, so it helps to stop the refrigerant from entering the oil. This is essential, especially for residential and commercial AC systems or heat pumps where freezing increases refrigerant congealing with oil while the system is idle. The advantages of crankcase heaters include increased compressor durability, better operation efficiency, and protection against a flooded start that happens when liquid refrigerant gets into the compressor.