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Bard part number 8000-511 is an OEM replacement compressor (model YA51K1E-TF5-ASC) used in select Bard wall-mounted and related packaged HVAC equipment to restore proper refrigerant circulation and cooling capacity when the original compressor has failed or is electrically/mechanically out of tolerance. This is a refrigerant and mechanical component, so correct match-up is critical: verify the exact Bard model and serial number, refrigerant type, and electrical requirements before ordering, and follow standard best practices for compressor replacement such as replacing the filter drier, evacuating to a deep vacuum, and confirming proper charge and airflow so the new compressor is protected on start-up.