Lennox 48G63 Supply Air Sensor A 'Close on Rise' switch

A 'Close on Rise' switch is typically used for fan control to start a blower once the heat exchanger warms up

keeping the right capacitor on the truck is essential for avoiding callbacks on furnace and air handler calls

HVAC contractors rely on this 370F rollout switch to prevent cabinet damage and fire hazards in mid-to-high efficiency furnaces

and interlocking safety circuits

It is engineered to monitor high-temperature conditions and interrupt power to the gas valve if temperatures exceed the 150F threshold

Lennox 48G63 Supply Air Sensor A 'Close on Rise' switchThe Lennox 48G63 Supply Air Sensor is a critical diagnostic component engineered for high precision temperature monitoring within residential and commercial air handlers and heat pump systems. Designed to interface directly with Lennox iComfort communication systems, this NTC thermistor based sensor provides real time feedback to the integrated control board, ensuring the HVAC system maintains precise discharge air temperatures. By utilizing patented