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Bard part number 8000-304 is an OEM replacement compressor (RGA5453BXD) used in Bard wall-mounted HVAC equipment to restore proper refrigerant compression and system capacity when a failed or grounded compressor is causing hard starts, breaker trips, or poor cooling. This compressor is specified for 208 to 230V applications and is intended for R-410A systems, making it a direct-fit service part when you need to bring a Bard unit back to factory operating performance. As with any compressor changeout, confirm the exact unit model and serial, match the electrical and refrigerant requirements, and follow best practices for evacuation, oil and refrigerant handling, and clean system startup to protect the new compressor.