Lennox 26W41 2-Stage Pressure Switch 0.50/.85"

The Lennox 26W41 is a 2-stage pressure switch that has been developed to be used with Lennox HVAC equipment only. It acts as a safety control by detecting the pressure change with the air inside the system. The switch has two set pressure ranges (stages). If the air pressure drops below the first stage set point of 0.50” WC, the switch turns on the furnace to heat up. If the pressure goes up to the second stage set point, the switch turns on the furnace to high-stage heating for more heat production.