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Bard part number 8000-330BX is an OEM rotary compressor (RGA5510BXD, boxed) used in Bard wall-mount air conditioners and heat pump units to circulate refrigerant and restore proper cooling capacity when a compressor has failed or is electrically or mechanically out of spec. As a core mechanical component, correct selection depends on matching your unit model and serial to the exact Bard compressor listing, along with confirming refrigerant type and electrical requirements for your application, so you get reliable start-up, stable operating pressures, and factory-intended performance after replacement.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.