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Bard part 8000-903 is an OEM scroll compressor assembly listed as Copeland model ZR28K5E-PFJ-800, used to restore proper refrigerant compression and cooling performance in compatible Bard wall-mounted air conditioner systems. A correct compressor match is critical for reliable start-up, correct operating pressures, and long service life, so verify the unit model and electrical/refrigerant requirements before ordering, then follow standard best practices for compressor replacement including system cleanup, deep evacuation, and proper charging for the application.