Lennox 57W38 Limit Switch 30067439-890 Smith residential boilers

Smith residential boilers

Non-Linting Design: Features an aerated pilot flow that prevents debris buildup

Professionals choose this OEM furnace bracket to guarantee a perfect fit and long-term HVAC system reliability

Factory Precision: Genuine Carrier 48TM400755 ensures exact manifold alignment and header placement for simplified field brazing

Lennox 57W38 Limit Switch 30067439-890 Smith residential boilersThe Lennox 57W38 Limit Switch is a critical OEM replacement part designed for high limit temperature monitoring in residential gas and electric furnaces. This SPST (Single Pole Single Throw) safety control features a 3 inch insertion length, making it compatible with specific Lennox, Allied, Armstrong, and Ducane heating units. Engineered for precise thermal regulation, the switch is calibrated to open the circuit at 180F to prevent heat exchanger