Lennox 26W85 2-Stage Pressure Switch

The Lennox 26W85 2-Stage Pressure Switch is a safety and control device particularly for multi-stage furnaces and other HVAC systems. This pressure switch controls the furnace air pressure to its combustion chamber to maximum safety and efficiency. It regulates the flow of the furnace blower and gas valve during the heating process by starting at two different pressure points. It also offers maximum combustion and thus offering the dryers maximum levels of efficiency in energy use. If there is an abnormal pressure, the switch turns off the furnace so as to prevent problems such as overheating or incomplete combustion.