Lennox 63W56 Pressure Switch 0.35/0.60" WC SPST Normally Open 2Stage

The Lennox 63W56 Pressure Switch is an essential controller element used in Lennox two-stage heating devices. The 63W56, with a focus on safety and optimization of its usage. This switch is SPST, single-pole, single-throw switch that controls the air pressure in your furnace. It has two specific pressure settings: a lower one of 0.35 In. W.C, and a higher one of 0.60 In. W.C. These settings are related to the two phases of your heating system. At this pressure, the switch turns on the first heating stage of the furnace when the setting drops to the lower level.