Description
The York S1-02435309000 Air Pressure Switch is designed to monitor airflow pressure within combustion or venting circuits in HVAC systems. It has a -0.35-inch WC setpoint in a fall, single pole, and normally opened, allowing the system control board to verify proper inducer draft before ignition or continued operation. It is used in furnaces and packaged units, where it connects to sensing tubing from the inducer housing or vent path to detect pressure changes during operation. It operates as an interlock that helps ensure correct exhaust flow and prevents operation under restricted or failed airflow conditions.
