Lennox 66J78 Limit Switch Els PW 17895 the 64391 kit includes the

the 64391 kit includes the bracket and the specialized high-temperature tape required for the conversion

Broad Interchangeability: Replaces multiple previous versions

This 160F CO Auto Limit Switch acts as a critical safety benchmark

A 70W heater is sized to maintain proper oil viscosity for specific compressor frames

and shuttering valves caused by mineral scale or mechanical wear

Lennox 66J78 Limit Switch Els PW 17895 the 64391 kit includes theExperienced HVAC contractors recognize the Lennox 66J78 Limit Switch as a critical safety component for maintaining furnace integrity and preventing heat exchanger damage. This OEM Lennox replacement part is a 36T series disc style control designed for High Limit or Secondary Rollout applications. It features a Normally Closed (NC) circuit that opens on temperature rise to interrupt the heating cycle if internal temperatures exceed safe operating