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Bard part number 8620-271 is an OEM CCH kit (crankcase heater kit) specified for Bard D48 and D60 series wall mounted HVAC units to help protect the compressor during low ambient operation. A properly working crankcase heater keeps refrigerant from migrating into the compressor oil during off cycles, reducing the risk of hard starts and internal compressor damage when the system calls for cooling. This kit is intended as a direct fit replacement to restore the factory designed cold weather reliability and should be selected using your unit model and serial information to confirm correct application before ordering.