Lennox 66J78 Limit Switch Els PW 17895 Using this component for high-voltage

Using this component for high-voltage loads can result in insulation failure and system damage

The FM55 is a 3-leg torsion bracket

This component meets stringent EIA-456-A industry standards

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 Using this component for high-voltageExperienced 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