Reznor 146465 Limit Switch

The Reznor 146465 Limit Switch is a critical OEM replacement part engineered for precise thermal regulation in unit heaters and forced-air systems. This auto fan limit switch operates within a specific 105-135F temperature range, ensuring the blower fan activates once the heat exchanger reaches 105°F and continues to dissipate residual heat until the plenum drops to 135°F. Pro-grade construction and a 60T12 terminal configuration provide the reliability needed for high-demand industrial and commercial environments. By maintaining these strict thermal parameters, this high limit safety control prevents short-cycling and protects the heat exchanger from structural fatigue caused by overheating.

For veteran technicians, the Reznor 146465 offers a direct-fit solution to restore furnace fan control without the need for field modifications. Whether you are troubleshooting a furnace not blowing hot air or addressing a limit switch tripping due to restricted airflow, this genuine component ensures your HVAC system diagnostics remain accurate and your repairs meet factory specifications. Its automatic reset capability and durable temperature sensor housing make it a staple for maintaining energy-efficient HVAC performance during peak heating seasons.

• Optimized Airflow Control: Automatically manages blower timing to maximize unit heater efficiency.
• System Safety: Acts as a primary safety limit switch to prevent combustion chamber overheating.
• Precision Engineering: Specialized 105-135F set points designed specifically for Reznor equipment compatibility.
• Heavy-Duty Reliability: Built with industrial-grade materials to withstand constant thermal cycling.

• What are the symptoms of a bad limit switch on a furnace? Common signs include the blower fan running continuously, the furnace shutting off prematurely, or the system failing to trigger the fan after the burners ignite.
• How do I know if my Reznor limit switch needs replacement? If HVAC troubleshooting reveals that the contacts are stuck open or if the fan fails to engage at 105°F, the internal thermal disc may be fouled or exhausted.
• Is this switch a universal HVAC part? While it shares features with other controls, the Reznor 146465 is specifically calibrated for the airflow requirements and heat rise of Reznor unit heaters.

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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.