Nordyne 632451R SPST Pressure Switch, 0.90" WC

The Nordyne 632451R Single Pole Single Throw Pressure Switch that is used in different HVAC systems especially in gas furnaces. This pressure switch has the essential safety function of checking the venting and combustion in the furnace. Its main application is to identify and confirm sufficient draft or negative pressure in the venting system. This pressure is established by the inducer motor which pulls the combustion gases out of the furnace and through the venting. The 632451R is designed to trigger at a particular pressure of 0.90 inches of water column