mount the sensor on the north-facing wall of the building

This 121866 Reznor part is built for the rigors of commercial and industrial environments

or if the flame sensor signal is weak

This indicates the switch isn't closing to prove safe airflow

maintaining system uptime in demanding commercial environments

Burnham Boiler 109620-01 Valve THPU32HP7Y mount the sensor on theThe Burnham Boiler 109620 01 Valve is a critical gas control component engineered for precise natural gas manifold pressure regulation between 0. 7" and 3. 5" W. C. This 1 2 inch NPT gas valve features a step opening characteristic, ensuring smooth ignition transitions and stable combustion across Burnham residential hydronic systems. As a direct OEM replacement valve for discontinued part numbers 81660145U and 81660282, it maintains the structural