Lochinvar & A.O. Smith 100274734 Flue Sensor 320720-756 It uses ECM constant torque

It uses ECM constant torque logic to adjust performance based on the specific taps energized by the furnace or air handler control board

utilizing this genuine Johnson Controls replacement part ensures thread compatibility and material integrity

while the internal thermal protection prevents winding failure during restricted airflow conditions

Whether you are performing a mid-season repair or a routine furnace gas valve replacement

01%) to prevent thermal bleed

Lochinvar & A.O. Smith 100274734 Flue Sensor 320720-756 It uses ECM constant torqueThe Lochinvar & A. O. Smith 100274734 Flue Sensor is a critical safety component designed for high efficiency condensing boilers and water heaters. This exhaust temperature sensor monitors the heat levels within the venting system to prevent heat exchanger damage and plastic vent meltdown. Also identified by part number TST2013, this NTC thermistor provides the control board with precise resistance readings, ensuring the unit modulates or shuts down