Lennox 10M75 Limit Switch 340155-7026 What causes a Selectra system

What causes a Selectra system to drift from the setpoint

for D-3244

this unit utilizes horizontal mounting and is specifically calibrated for applications where a remote master controller resets the setpoint based on external variables like outdoor air temperature

If using with R-22

With a broad setpoint range of 30° to 110°F and a liquid-filled 1 3/8" x 2 1/4" coiled sensing bulb

Lennox 10M75 Limit Switch 340155-7026 What causes a Selectra systemThe Lennox 10M75 Limit Switch is a critical safety component designed for high limit thermal protection in Lennox HVAC systems. Engineered as a genuine OEM replacement part, this L210 40F limit switch operates on a snap disc thermal response mechanism to monitor heat exchanger temperatures. It is calibrated to open the circuit at 210F and automatically reset when temperatures drop by a 40F differential (resetting at 170F). This auto reset furnace