Lennox 29M74 Limit Switch 328140-751 using the Carrier SF703026 maintains

using the Carrier SF703026 maintains the factory seal and electrical impedance required for modern high-efficiency systems

where consistent temperatures are vital for product safety

preventing nuisance tripping while providing reliable high-limit protection

and York gas-fired systems

specifically calibrated to maintain high static pressure and balanced airflow across the coil

Lennox 29M74 Limit Switch 328140-751 using the Carrier SF703026 maintainsThe 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