Lennox 18M84 Limit Switch Els PW 17895 meaning it has a set

meaning it has a set diameter

Key Benefits Universal Compatibility: Seamlessly integrates with 35 and 70 inch-pound non-spring return actuators

Cracks in the insulation or loose terminal connectivity will bleed off the voltage required for a strong spark

and HE105C models

Encapsulated Design: The hermetically sealed switch prevents contact contamination from dust

Lennox 18M84 Limit Switch Els PW 17895 meaning it has a setProfessional grade Lennox 18M84 limit switches are critical safety components designed to regulate internal furnace temperatures and protect heat exchangers from thermal stress. This OEM Lennox limit control features a 3 inch insertion depth and is factory calibrated for an auto reset range of 230 260F. As a normally closed switch, it breaks the electrical circuit to the gas valve if the plenum temperature exceeds the 260F threshold, typically caused