Bard 8402-070 Limit Switch

The Bard 8402-070 Limit Switch is a critical safety component designed for HVAC temperature regulation in Bard wall-mount units and forced-air systems. Engineered with a precision bimetal sensor, this 2-pole limit control provides essential overheat protection by interrupting the electrical circuit if internal temperatures exceed the 160°F threshold. This specific model features a standard 160°F-40°F operating range, ensuring the system resets once the temperature drops back into the safe operating zone. For technicians, this OEM replacement part is a direct match for the Bard 8402-070BX, maintaining the administrative and safety standards required for high-performance heating and cooling equipment. Its 120VAC compatibility and durable construction minimize nuisance shutdowns while protecting the heat exchanger from thermal stress. When diagnosing intermittent system failures or "limit open" codes, replacing the high-limit switch with this genuine Bard component ensures long-term reliability and precise thermal response.

• Precise Thermal Protection: Features a 160°F trip point to prevent heat exchanger damage and ensure safe equipment operation.
• Automatic Reset Logic: The 40°F differential allows the system to cycle back on automatically once safe temperatures are restored.
• Broad Compatibility: Primarily utilized in Bard wall-mounted HVAC units, furnaces, and specific heating applications requiring a 2-pole configuration.
• Industrial Build Quality: Constructed with high-grade materials to withstand the high-cycle demands of commercial and residential HVAC environments.

What are the symptoms of a failing Bard 8402-070 limit switch?
A faulty switch typically causes the indoor blower to run continuously or prevents the heating element/burner from engaging, often resulting in a "limit circuit open" error on the control board.

Is the 8402-070 interchangeable with the 8402-065?
While they look similar, you must match the temperature ratings. The 8402-070 is rated for 160°F; installing a switch with different set points can cause safety hazards or frequent equipment tripping.

How do I verify the 2-pole wiring for this part?
Always refer to the unit-specific wiring diagram. This 120VAC 2-pole switch is designed to break both sides of the safety string or specific control legs depending on the Bard model's circuit design.

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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.