Reznor 112751 Switch

The Reznor 112751 Blocked Vent Switch is a critical safety component designed for HVAC unit heaters and furnace systems. As an OEM Reznor replacement part, this L200F limit switch is engineered to monitor airflow within the ventilation system. It features a fixed 200-degree Fahrenheit trip point, serving as a primary defense against hazardous flue gas backup. When a blockage occurs in the vent pipe, the resulting temperature spike triggers the switch to open the electrical circuit, immediately shutting down the gas valve to prevent carbon monoxide infiltration and equipment overheating.

This thermal safety switch is specifically tailored for L200F applications, ensuring a precise match for system impedance and response times. Its compact, durable construction is built to withstand the high-cycle demands of commercial and industrial heating environments. For contractors handling service calls on Reznor UDAP or similar power-vented units, installing this blocked vent safety switch ensures the equipment operates within factory-specified parameters, maintaining the integrity of the heat exchanger and venting assembly.

• Precise Thermal Monitoring: Fixed L200F (200°F) set point ensures reliable shutdown during vent obstructions.
• OEM Compatibility: Precision-engineered Reznor 112751 part guarantees seamless fit and electrical alignment.
• Enhanced Safety: Built to prevent hazardous exhaust accumulation in warehouses and manufacturing facilities.
• Industrial-Grade Build: Designed for high-temperature resilience in heavy-duty HVACR environments.

How do I know if my Reznor unit needs a new blocked vent switch?

If your heater is short-cycling or the control board flashes a code indicating a limit trip, check for actual flue obstructions first. If the vent is clear but the circuit remains open, the 112751 switch may have failed and requires replacement.

Is the L200F switch a manual or automatic reset?

The Reznor 112751 is typically a safety limit that requires a manual reset or a complete power cycle depending on the specific heater model's control logic; always verify the flue remains unobstructed before resetting.

Can I use an aftermarket limit switch instead of the 112751?

Technicians should always use the OEM Reznor 112751 to ensure the trip temperature and mounting configuration meet the original safety certifications of the appliance.

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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.