Description
The Rheem-Ruud 42-101955-02K SPST Pressure Switch is a sensing component used to regulate airflow verification within gas furnaces and heating assemblies in HVAC systems. It operates at a calibrated setting of -0.40″ WC and operates by monitoring draft conditions created by the inducer motor during startup and operating cycles. It is used to control the circuit by helping confirm proper venting before burner ignition, reducing operation in heating equipment. It is placed where controlled airflow confirmation is necessary for stable combustion performance.
