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

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

and shuttering valves caused by mineral scale or mechanical wear

This component meets stringent EIA-456-A industry standards

Broad Interchangeability: Replaces multiple previous versions

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