Lennox 75M31 Limit Control 320734-701 and ignition module share a

and ignition module share a common chassis ground

375-inch I

the MARS 33217 is specifically designed for 240V heat sequencer applications

maintaining stable operation despite fluctuations in line voltage or ambient temperature

Lennox 75M31 Limit Control 320734-701 and ignition module share aThe Lennox 75M31 Limit Control is a critical OEM replacement part designed to maintain safe thermal operating parameters within residential and commercial HVAC systems. As a primary high limit switch, this component utilizes a precise L170 40F calibration, meaning the normally closed contacts are engineered to open when the heat exchanger surface temperature reaches 170F. Once the circuit is interrupted, the burner ignition or heating source is