Description
The York S1-02435286000 Air Pressure Switch is a safety control component used to monitor draft or airflow pressure within HVAC systems. It is set to operate at -0.90″ water column on fall, triggering system response when pressure drops below the specified threshold. This switch is commonly installed in gas furnaces and related heating equipment, where it integrates into the inducer and venting control circuit to verify proper airflow before allowing ignition and continued operation. It helps ensure safe combustion and reliable system sequencing during heating cycles.
