York S1-024-35270-000 SPNO Pressure Switch 0.45" WC Close On Fall

The York S1-024-35270-000 SPNO Pressure Switch is used for HVAC systems. This switch measures the air pressure in the ductwork or the equipment. In particular, it opens or shuts its electrical contacts when the pressure drops to 0.45 inches of water column This is an essential in safety and protection of the system. The switch would then activate, it may turn off the heating or cooling unit to avoid such problems as overheating. It helps to keep the equipment safe and avoid expensive repairs as well as guarantee smooth functioning of the heating and air conditioning systems, due to proper flow of air.