Description
The Rheem-Ruud AP24422 Water Heater Pressure Switch detects combustion air movement in gas-fired water heaters requiring verified draft conditions before permitting burner ignition and fuel delivery. It monitors the differential pressure created by induced draft blowers or natural convection in HVAC systems, closing electrical contacts only when adequate airflow ensures complete combustion and proper venting of exhaust gases. The diaphragm-actuated mechanism responds to slight pressure changes preventing operation during blocked vent scenarios insufficient draft conditions or blower flue gas spillage into occupied spaces. Calibrated setpoints match specific appliance requirements ensuring consistent proving without distracting lockouts from normal pressure variations.
