The Reznor 112753 High Limit Switch is a critical safety component designed for precise thermal regulation in Reznor unit heaters. This Hi-Limit Block Vent Switch features an L150F temperature rating, specifically engineered to open the electrical circuit when internal temperatures reach 150°F. As a manual reset limit switch, it provides an essential layer of protection for the heat exchanger and venting system, preventing operation under unsafe conditions such as flue blockages or restricted airflow. This genuine Reznor OEM part is easily identified by its signature white dot marking, ensuring the electrical characteristics and trip points match the original equipment specifications exactly. Integrating this 150 degree high limit control into your service routine ensures systems maintain UL compliance and intended combustion safety parameters. Whether you are performing a seasonal tune-up or troubleshooting a burner lockout, replacing a faulty limit switch with the Reznor 112753 restores proper sequencing to the furnace control board. Key Benefits for Technicians: OEM Compatibility: Exact replacement for Reznor 112753, ensuring proper fitment and terminal alignment without field modifications. Enhanced Safety Logic: The manual reset functionality requires a technician to inspect the heat exchanger for cause of failure before restarting. Precise Calibration: Factory-set L150F trip point provides a strict thermal ceiling to protect expensive system components from heat stress. Durable Construction: Built to withstand the high-cycle demands of commercial and industrial HVAC environments. Common Questions: What causes the Reznor 112753 switch to trip? A trip is typically triggered by restricted airflow, a failed blower motor, or a blocked vent pipe causing heat to build up beyond the 150°F threshold. Is this switch compatible with multi-stage Reznor units? Yes, as long as the service manual specifies the 112753 or the L150F white dot component for that specific model series. Can I bypass the manual reset if the unit keeps locking out? No. Bypassing safety controls is a code violation and poses a fire hazard. If the switch keeps tripping, the underlying airflow or venting issue must be corrected. 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.
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