Bard HVAC 8402-075BX Limit Switch

The Bard 8402-075BX Limit Switch is a critical safety component designed for precise thermal regulation within Bard wall-mount air conditioners and heat pump systems. This specific high-limit control features a 7-170F AUTO reset configuration, ensuring the unit cuts power to the heating elements or compressor if temperatures exceed safe operational thresholds, then automatically resets once the plenum cools. Engineered as a direct replacement, the 8402-075BX is identical to 8402-075, maintaining the exact form, fit, and electrical specifications required for HVAC high limit switch replacement. As a veteran-preferred Bard OEM part, it ensures compatibility with series such as the WA, WL, and WH models. Replacing a fouled or tripped fixed temperature limit control is essential for preventing equipment overheating and maintaining system uptime. This Bard 8402-075BX safety switch offers the rugged reliability needed for demanding commercial and telecommunication HVAC thermal protection applications, ensuring consistent performance in high-cycle environments.

• Direct OEM Match: Fully interchangeable with Bard part number 8402-075 for seamless field installation.
• Automatic Reset Logic: Eliminates manual resets by restoring circuit continuity once temperatures drop below the 170°F cutout point.
• Critical Safety Compliance: Engineered to meet strict UL and manufacturer specifications for over-temperature protection.
• Durable Construction: Built to withstand the high-ambient conditions typical of wall-mount HVAC cabinets.

Common Technical Questions

Is the Bard 8402-075BX a manual or automatic reset switch?
This model is an auto-reset limit switch, meaning it will automatically close the circuit once the sensed temperature falls back within the safe operating range, typically 40°F below the trip point.

How do I verify if my Bard unit uses the 8402-075BX?
Check your unit's parts list or the existing switch faceplate. If your manual calls for an 8402-075 or 8402-075BX, this is the correct technical replacement.

What causes this limit switch to trip repeatedly?
Common causes include restricted airflow from dirty filters, a failing blower motor, or blocked return air grilles, all of which lead to localized overheating in the heat exchanger or heater strips.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.