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Bard part number 8605-021 is an OEM wrap-around crankcase heater for Bard HVAC compressors in 575V applications. This heater band installs around the compressor crankcase to keep the oil and crankcase warm during off cycles, helping reduce refrigerant migration and oil dilution that can lead to noisy starts, nuisance trips, or premature compressor wear in colder conditions. It is a direct-fit Bard replacement intended to restore proper compressor protection and reliability, so confirm your unit model and electrical rating match 575V before ordering.