Bard S8402-028 Limit Control

The Bard S8402-028 Limit Control is a critical OEM safety component engineered for Bard wall-mount HVAC units and similar industrial climate control systems. This high-limit switch is designed to protect the heat exchanger and internal components from thermal damage by monitoring air temperatures within the plenum. Operating with a 150°F open and 125°F close configuration, it ensures the burner or heating elements are de-energized if the system exceeds safe operating thresholds. As a direct replacement for Bard 8402-028, this 150 degree limit control maintains the original equipment specifications required for precise safety circuit integration. For veteran technicians, this HVAC limit switch is essential for resolving short-cycling or "blower always on" symptoms caused by a tripped or failing thermal sensor. Utilizing this Bard OEM replacement part ensures the system remains compliant with the manufacturer's safety protocols and prevents nuisance shutdowns in heavy-duty commercial or telecommunication shelter applications.

• Precise Thermal Calibration: Features a fixed 150°F trip point to prevent heat exchanger fatigue and ensure operational safety.
• OEM Compatibility: Serves as the factory-authorized replacement for the discontinued 8402-028, ensuring correct fitment and terminal alignment.
• Automatic Reset: Resets the circuit once temperatures drop to 125°F, allowing for standard system recovery once airflow issues are addressed.
• Durable Construction: Built to withstand the high-cycle demands of industrial HVACR environments without drift in temperature sensitivity.

What causes a 150F limit control to trip frequently?
Repeated tripping of the Bard S8402-028 usually indicates restricted airflow. Check for a dirty air filter, blocked return vents, or a failing blower motor. If the switch remains open even after the system has cooled, the internal bimetal disc may have failed, requiring a full replacement.

Can I use a higher temperature limit switch if this one keeps tripping?
No. The 150°F rating is specific to the heat exchanger’s design and safety listing. Installing a higher limit can lead to catastrophic equipment failure or safety hazards. Always replace like-for-like using the S8402-028 to maintain system integrity.

Is this compatible with older Bard 8402-028 models?
Yes, the S8402-028 is the direct superseded part number for the 8402-028. It is designed to mount in the same location with standard wiring connectors.

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.