Lennox 46K72 Limit Switch 319852-301 The cast iron E-Main valve

The cast iron E-Main valve is typically rated for a maximum inlet pressure of 250 PSIG at 450°F

Simplified Installation: Features standard spade terminal connectors and mounting brackets for quick field replacement during service calls

For veteran contractors managing high-efficiency hydronic systems

Built for durability in high-demand residential and commercial applications

Smith commercial and residential boilers and water heaters

Lennox 46K72 Limit Switch 319852-301 The cast iron E-Main valveThe Lennox 46K72 Limit Switch is a critical safety component designed for precise thermal regulation within residential and commercial HVAC units. Engineered with a 250 degree Fahrenheit cutout and a 220 degree Fahrenheit reset, this auto reset limit switch prevents heat exchanger damage by breaking the electrical circuit if internal plenum temperatures exceed safe operating limits. This specific L250 30 model features a manual reset safety bypass or