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Bard part number 8000-110 is an OEM compressor assembly (listed as Compressor AW103ET-001-A4, also referenced as AW5519F) used in select Bard wall mounted air conditioner and heat pump units to drive the refrigeration cycle and restore proper cooling or heating capacity when the original compressor has failed or is electrically out of spec. As a core mechanical component, correct match-up is critical, so confirm the unit model and serial number along with refrigerant type and electrical ratings before ordering, and follow standard best practices for compressor replacement such as replacing the filter drier, verifying system cleanliness, and weighing in the factory specified charge after evacuation and leak testing.