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Bard part number 8000-143 is an OEM compressor (CR22K6-PFJ-270) used in select Bard wall-mounted air conditioner and environmental control unit refrigeration circuits to compress refrigerant and maintain proper system pressures for reliable cooling. When a compressor is locked, shorted, or losing pumping capacity, replacing it with the correct Bard factory part helps restore designed performance and protects the rest of the sealed system from abnormal operating conditions. Confirm the exact unit model and serial number compatibility before ordering, and plan to follow standard best practices for sealed-system service, including verifying refrigerant type, replacing the filter drier as needed, evacuating properly, and checking operating pressures after start-up.