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Bard part number 917-0413BX is an OEM service coil assembly (boxed) used to restore proper heat transfer and refrigerant performance in compatible Bard wall-mounted HVAC units when a coil has leaked, corroded, or become restricted. Replacing the coil assembly helps bring capacity and efficiency back to spec and can prevent repeat issues like high head pressure, poor cooling, or nuisance freeze-ups caused by a compromised coil. Because coil assemblies are model and revision specific, confirm compatibility with your unit model and serial number and follow Bard service procedures for evacuation, leak checking, and recharge after installation.
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.