Reznor 112752 Switch

The Reznor 112752 Blocked Flue Switch is a critical safety component designed for specific Reznor unit heaters. This manual reset limit switch operates with an L225F temperature rating, meaning it is calibrated to trip and interrupt the burner circuit when flue temperatures reach 225 degrees Fahrenheit. As a genuine Reznor replacement part, it ensures the unit remains compliant with original equipment manufacturer specifications, preventing hazardous operation during venting failures or internal heat exchanger obstructions. For technicians troubleshooting Reznor heater error codes or persistent flame roll-out issues, verifying the integrity of the flue pressure switch and this thermal limit is essential. This switch is engineered for high-cycle reliability in industrial environments, providing a positive break in the safety loop that requires manual intervention to restart the system, ensuring the underlying venting issue is addressed by a professional before operation resumes.

• Precision Thermal Calibration: The L225F rating ensures exact trip points for maximum equipment protection.
• Manual Reset Safety: Prevents automatic recycling of the heater under unsafe blocked flue conditions.
• OEM Compatibility: Direct fit for multiple Reznor model series, ensuring proper mounting and terminal alignment.
• Robust Construction: Designed to withstand high-ambient temperatures near the combustion collector box.

What causes a Reznor 112752 switch to trip?
This switch typically opens due to a blocked flue pipe, improper venting pitch, or a failing venter motor assembly that cannot clear combustion gases effectively.

Can I bypass the manual reset switch for testing?
Bypassing safety controls is not recommended. If the blocked flue limit switch trips, the technician must inspect the entire venting system and heat exchanger for soot or obstructions.

How do I confirm if this switch is faulty?
Using a multimeter, check for continuity across the terminals. If the switch is cool and not tripped but shows an open circuit, the internal bimetal disc has failed and the HVAC safety switch requires replacement.

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.