This automatic reset limit switch is engineered with a trip point range of 140-160°F

uneven ignition

this is dedicated 4-wire smoke detection hardware requiring separate power and initiation circuit wiring

resistance drops—allowing the boiler’s control logic to modulate firing rates and maintain supply water setpoints without short-cycling

the H-548NS allows for precise calibration

Lennox 58W22 Bearing Bracket 321702-401 This automatic reset limit switchThe Lennox 58W22 Bearing Bracket is a critical structural component engineered to provide stable motor support and precise alignment within residential and commercial blower assemblies. This 3 leg bearing bracket is specifically designed to house the blower shaft bearing, ensuring vibration free rotation and optimal airflow across the heat exchanger. Built from high grade, heavy duty metal, the 58W22 is a direct OEM replacement part (also identified