Lennox 63W39 2-Stage Pressure Switch 0.50/0.85"

The Lennox 63W39 model of 2-stage pressure switch usually used in HVAC appliances. It plays the safety and efficiency sentinel role by keeping track of air-pressure within the system. When the pressure of the air gets to certain set levels the switch operates electrical parts to switch on or off. For example it can tell the furnace to shift from low to high stages of heating or turn off if there are fatal pressures. Common in gas furnaces and air handlers the 63W39 is helpful in minimizing the difficult and often dangerous functions necessiting the Lennox piece of HVAC equipment.