Compressor Crankcase Heater
During the normal operation of a central air conditioner or heat pump the compressor is both drawing "suction" from the evaporator and "discharging" hot gas into the condenser coil. While running, there is enough heat being generated by the compressor running to keep from creating refrigerant migration from occurring. Refrigerant vapor always migrates to the coldest part of the system - the compressor. The refrigerant "migrates" to the compressor crankcase where it is attracted to the compressor oil. This refrigerant vapor "condenses" ( turns back to a liquid during the "off cycle") then on the next start of the compressor, the oil is in a watery state and washes the bearings out, which leads to locked up, frozen or totally burnt out compressors. This is especially true of Heat Pumps. Some manufacturers of AC equipment install crankcase heaters either in the compressor or mount them externally around the base of the compressor. The (2) wires of the heater is wired directly to the 230 Volt input side of the contactor from the main power supply, and is always supplying 230 volts of power to the heater. The result is a warmed lower section of the compressor which drives any refrigerant that gathers there back into the system rather than to allow condensation in the crankcase. This is an over simplification, but we think you get the idea.
If you have had a locked up compressor and have freed it up with a Hard Start Kit, you would be well advised to consider adding a crankcase heater to your system.
Crankcase Heater (B12-547)
PLEASE NOTE: U.P.S. DOES NOT OPERATE ON THE WEEKEND, SO IF YOU ORDER A NEXT DAY AIR PART ON FRIDAY, YOU WILL NOT GET IT ON THE WEEKEND! WE CAN'T BE RESPONSIBLE FOR THE U.P.S. DELIVERY SCHEDULES. IF YOU NEED A PART FOR THE WEEKEND, PLEASE ORDER BY THURSDAY BEFORE NOON MOUNTAIN TIME.
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