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Bard part number 910-2109BX is an outdoor temperature and humidity sensor assembly (boxed) used on select Bard wall mounted HVAC equipment to report outdoor conditions back to the unit controls for proper staging, ventilation, and humidity related operating decisions. As a genuine Bard OEM replacement, this sensor assembly is built to match the original electrical characteristics and connector fit so the control can read accurate outdoor temperature and RH values, which helps prevent nuisance issues tied to incorrect sensor input. Confirm compatibility by matching the part number and verifying your unit model and serial against the Bard parts list before ordering, since sensor locations and harness interfaces can vary by series and control platform.
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.