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Bard part number 8000-849 is an OEM replacement scroll compressor listed as ZR42K5-TFD-800, used to restore proper refrigerant compression and cooling capacity in compatible Bard wall-mounted package units. This compressor is a direct-fit Bard specified component, so it is the right choice when you are addressing hard-start complaints, locked rotor conditions, abnormal amp draw, or confirmed compressor mechanical failure and you want the system to run and cycle the way Bard engineered it. Because compressor variants can differ by refrigerant, voltage, and electrical characteristics, confirm your unit model and serial number and match the compressor code (ZR42K5-TFD-800) before ordering, then follow best practices during replacement such as correcting the root cause, replacing the filter drier, pulling a deep vacuum, and weighing in the charge per the Bard service literature.