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Bard part number 8000-820 is an OEM replacement compressor listed as CR42K6-TFD-875, built for Bard wall-mounted and packaged HVAC equipment that uses an R-22 refrigerant circuit and 3-phase power. This hermetic reciprocating compressor is the heart of the sealed system, restoring proper refrigerant flow and compression so the unit can pull down space temperature and maintain capacity under load. Because compressor replacements are sensitive to electrical match and refrigerant compatibility, confirm voltage, phase, and the original compressor model from your Bard unit data label or service literature before ordering, and follow best practices during installation such as replacing the filter drier, verifying oil and charge requirements, and confirming correct line connection sizes for your application.