Lennox 29M74 Limit Switch 328140-751 Standard Threading: Features a 5/16-18

Standard Threading: Features a 5/16-18 NPT female connection for easy replacement and universal fit

Key Benefits Dual Coil Voltage: Versatile 24 Vac/dc or 120 Vac input simplifies field wiring and reduces inventory overhead

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

This replacement vertical drain pan provides the exact dimensions and port orientations required for optimal moisture management and leak prevention in tight mechanical closets and upright installations

As a direct 7200ERCS-1 replacement

Lennox 29M74 Limit Switch 328140-751 Standard Threading: Features a 5/16-18The 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