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this board manages the induction motor
where consistent temperatures are vital for product safety
Its stainless steel sensing element is built to handle the mechanical stresses of high-side discharge environments
specifically calibrated to maintain high static pressure and balanced airflow across the coil
preventing nuisance tripping while providing reliable high-limit protection
Lennox 29M74 Limit Switch 328140-751 this board manages the inductionThe Lennox 29M74 Limit Switch is a critical fixed temperature safety component engineered for Lennox furnace flame rollout and primary limit protection. This SPST (Single Pole Single Throw) thermal switch is rated for a 140F trip point with a 30F differential, ensuring precise furnace cycling and preventing heat exchanger damage. Designed as a direct OEM replacement limit switch, the 29M74 features a 1 inch insertion depth and 1 4 inch quick connect
