Reznor 202584 Limit Switch

The Reznor 202584 Limit Switch is a critical OEM safety component designed for precise thermal regulation in industrial and commercial heating applications. This 155-20F limit control is engineered to monitor heat exchanger temperatures, automatically opening the electrical circuit if the internal temperature reaches the 155°F threshold. This high limit switch features a 20°F differential, ensuring the system resets only once the temperature has dropped to a safe 135°F, preventing rapid cycling and protecting the burner assembly from thermal fatigue. As a genuine Reznor replacement part, it ensures direct compatibility with specific waste oil heaters and units where accurate high-temperature detection is mandatory for safe operation.

Field technicians frequently specify the L155-20F limit switch when troubleshooting Reznor waste oil heaters that exhibit premature shut-offs or failed safety inspections. Replacing a drifted or fouled limit control with this factory-spec HVAC high limit restores the original safety parameters of the equipment. This component is built for the high-duty cycles of commercial environments, providing the reliability required to prevent catastrophic overheating without the nuisance tripping common in low-quality aftermarket alternatives.

Key Benefits

• OEM Compatibility: Specifically designed for Reznor RA150, RAD150, and RV225 waste oil heaters.
• Precise Thermal Calibration: Fixed 155°F trip point with a 20°F differential for stable system performance.
• System Protection: Acts as a primary safety boundary to prevent heat exchanger damage and combustion issues.
• Contractor-Grade Durability: Robust construction handles the rigorous demands of industrial HVAC controls.

Common Questions

Which Reznor models use the 202584 limit switch?
This part is a standard high-limit safety for Reznor waste oil furnace models, including the RA series (RA150) and the RV series (RV225). Always verify your specific unit's wiring diagram to ensure the 155-20F specification matches.

What causes a limit switch to trip repeatedly?
While a faulty switch is possible, frequent tripping often indicates restricted airflow, such as a dirty blower, clogged air filters, or improper fan-to-motor spacing (typically requiring 2-1/8" clearance on specific models). Ensuring proper combustion air and venting is also crucial.

Is this a manual or automatic reset switch?
The 202584 is an automatic reset limit switch. Unlike manual reset rollout switches that require a physical button press, this component cycles back to a closed position once the temperature falls below the 135°F reset point.

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.