Description
The Lennox 20J44 High Altitude Pressure Switch Kit is an safety and control component used in compatible furnace system to monitor combustion airflow conditions at higher elevations in HVAC systems. It is installed in the furnace control and pressure sensing circuit, where it responds to induced draft fan operation and verifies proper pressure conditions before and during burner operation. The switch operates as part of the safety interlock system, ensuring the inducer motor establishes the required airflow signal for safe ignition and continued heating operation. In high-altitude applications, it is calibrated to account for reduced air density.
