Robust SPST Logic: Simplified single pole single throw operation provides a reliable "normally open" or "normally closed" circuit path for the ignition controller

such as fan coils and VAV reheat coils

The intuitive slide-switch interface for heating

preventing the delayed ignition or nuisance lockouts typical of universal alternatives

Common Questions What are the mounting requirements for the Reznor 194202

Lennox 93W72 Limit Switch 321142-301 Robust SPST Logic: Simplified singleThe Lennox 93W72 Limit Switch (also identified as L155 30F) is a critical safety component designed for precise thermal regulation in residential and commercial heating systems. This genuine OEM Lennox replacement part is engineered to monitor internal furnace temperatures and disrupt the electrical circuit if the heat exceeds the safety threshold of 155F. Featuring an auto reset function, the switch restores the circuit once temperatures drop by 30F