Reznor 112754 Switch

The Reznor 112754 Blocked Flue Switch is a critical safety component designed for commercial and residential HVAC units, specifically engineered to monitor venting conditions and mitigate hazardous exhaust buildup. This manual reset limit switch is factory-calibrated at a 175°F temperature rating (L175F), functioning as a fail-safe device that interrupts the heating cycle if a blockage occurs within the flue pipe or heat exchanger system. Utilizing a high-precision 36TX16 thermostat mechanism, this part ensures that the combustion process remains within safe thermal parameters, preventing damage to the unit heater burners and protecting occupants from potential CO leaks.

For service contractors troubleshooting Reznor heating systems, the RZ112754 provides consistent circuit control and is frequently utilized in UDX, UDAP, or UDAS series units. When a blocked vent condition trips this switch, the internal contacts remain open until a technician manually clears the obstruction and resets the device. This OEM replacement part is built for durability under frequent thermal cycling, ensuring the HVAC induction process operates with the correct differential pressure and airflow. Integrating this genuine Reznor safety switch preserves the system's operational integrity and meets specific manufacturer requirements for high-limit safety controls.

• Precision Thermal Safety: Fixed L175F trip point provides accurate response to excessive flue temperatures.
• Manual Reset Security: Ensures the system cannot resume operation until the root cause of the flue blockage is addressed.
• Durable OEM Construction: Reliable 36TX16 switch architecture designed for long-life performance in demanding HVAC environments.
• Broad Compatibility: Standardized fit for various Reznor gas-fired unit heaters and furnaces.

What causes the Reznor 112754 switch to trip?
The switch typically opens due to physical obstructions in the vent pipe, a failing venter motor, or an improperly sized flue that restricts exhaust flow, causing temperatures to exceed the 175°F limit.

How do I test a blocked flue switch during a service call?
Technicians should check for continuity across the terminals when the system is cool. If the circuit is open and the reset button hasn't been engaged, the limit switch may be faulty or has successfully responded to a high-temp event.

Can this switch be used in place of an automatic reset limit?
No, this is a manual reset safety device. Substituting it for an automatic reset switch can create a safety hazard by allowing the unit to cycle repeatedly under dangerous venting conditions.

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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.