The Reznor 96512 is a high-precision high-temperature limit switch designed as a critical safety component for commercial and industrial unit heaters. This auto reset limit switch operates within a precise thermal range of 140-220°F, effectively monitoring internal plenum temperatures. Formulated to protect heat exchangers from thermal stress, the Reznor 140-220F auto limit opens the control circuit when temperatures exceed secondary limits and automatically restores the circuit once safe operating parameters are reached. Specifically engineered for HVAC high limit control, the 96512 serves as the direct replacement for part 155764, ensuring seamless integration into legacy and current Reznor systems without modifying the existing wiring harness or mounting bracket. For technicians servicing Reznor UDAP, UDAS, and UDBP series equipment, this OEM Reznor 96512 provides the exact electrical specifications required to maintain system certifications. Installing a genuine Reznor temperature safety switch prevents frequent short-cycling and blower fan malfunctions caused by drifting calibration in aftermarket alternatives. The 36T21 style construction offers reliable contact closure and thermal sensitivity suitable for demanding unit heater environments. Key Benefits Direct OEM Compatibility: Specifically designed to replace the Reznor 155764, maintaining original factory specifications. Automatic Reset Logic: Eliminates the need for manual intervention by resetting the circuit once the unit cools, reducing unnecessary downtime. Broad Operating Range: Regulates temperature effectively between 140°F and 220°F for versatile application across various Reznor unit heater models. Safety Compliance: Acts as the primary fail-safe against heat exchanger overheating, protecting critical furnace components. Common Questions Why is my Reznor heater tripping the high limit switch? Tripping is typically caused by restricted airflow, such as a clogged filter, a failing blower motor, or an obstructed exhaust vent. Ensure the heat exchanger is clean and the fan is operating at the correct CFM before replacing the switch. Can I use a manual reset switch to replace the Reznor 96512? No. The 96512 is an auto-reset limit switch. Using a manual reset switch in its place could interfere with the control board's logic and lead to operational errors or safety risks. How do I identify a failing limit switch versus an airflow issue? If the switch opens before the 220°F threshold or remains open after the unit has cooled significantly, the internal bimetal disc has likely fatigued and requires replacement. 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.
