Nordyne 632492R SPST Pressure Switch -0.50" WC

The Nordyne 632492R Pressure Switch is made to check the negative pressure situation and indicate the correct work of the system. It responds at a set point of -0.50 inches of water column by connecting or breaking an electrical circuit by an SPST switching design as pressure variations take place during operation in furnaces and air handler HVAC systems. The switch is installed on the draft or pressure line of sensing and connected to the control wiring. This pressure reaction assists in ensuring that there is sufficient airflow, assists in proper ignition sequencing.