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The FM55 is a 3-leg torsion bracket
A 70W heater is sized to maintain proper oil viscosity for specific compressor frames
This 160F CO Auto Limit Switch acts as a critical safety benchmark
it is designed to snap into standard Modine control panel cutouts used in the 5H series applications
Lennox 66J78 Limit Switch Els PW 17895 The FM55 is a 3-legExperienced 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
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