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The Bard 917-0540BX is an OEM coated evaporator coil assembly supplied boxed for service replacement, designed to restore proper heat transfer and cooling performance in compatible Bard wall mount and packaged HVAC equipment. As the indoor refrigerant coil, it is a critical component for stable suction pressures, correct superheat, and reliable dehumidification, especially when a coil is leaking, restricted, or heavily corroded. Using the correct Bard factory coil helps ensure proper fit in the coil compartment and maintains the airflow and refrigerant circuit characteristics the unit was engineered for, which is important for performance and long term reliability 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.