Lennox 66J78 Limit Switch Els PW 17895 A 70W heater is sized

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

and shuttering valves caused by mineral scale or mechanical wear

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

This model is foot-print compatible with most standard industry mounts

The FM55 is a 3-leg torsion bracket

Lennox 66J78 Limit Switch Els PW 17895 A 70W heater is sizedExperienced 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