Nordyne 632444R SPST Pressure Switch 1.74" WC

The Nordyne 632444R SPST Pressure Switch is a safety control that can be used to check the condition of airflow or draft and will only permit the system to operate when the pressure is adequate. It reacts to a set point of 1.74 inches of water column by opening or closing an electrical circuit using a diaphragm-activated switch. The system is attached to the pressure-sensing circuit and connected to the circuit, in which, in gas furnaces and air handler HVAC systems, it assists in the assurance of safe operating conditions.