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Bard 117Y139BX is an OEM low voltage box assembly used in Bard wall mount HVAC equipment to safely route, terminate, and protect thermostat and control wiring inside the unit. This component helps keep low voltage connections organized and shielded from vibration, moisture, and accidental contact, which supports reliable call signals to contactors, relays, and control boards. If your existing box is cracked, corroded, or missing its cover, replacing it with the correct Bard part helps restore proper wiring protection and serviceability. Confirm fit by matching the part number to your unit model and serial, since low voltage box layouts can vary by series and revision.
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.