Lennox 33J88 Pressure Switch 4.50" Water Column SPST

The Lennox 33J88 is a pressure switch that is used mainly in HVAC systems. It is 4.5 Inches in size and requires a 240V circuit. Its name derives from the fact that it is a SPST switch, that is, it closes one circuit when it is switched on. This pressure switch monitors the amount of pressure in the HVAC system. When the pressure of the air reaches a certain level, the switch gives an electrical on/off signal. This signal contributes to the stabilization of the flow and pressure in the prescribed heating or cooling cycle as well as minimize risks.