Description
The York S1-02440873000 Pressure Switch senses air tension changes around the furnace and ventilation assemblies to verify proper airflow during heating operation. Calibrated for 0.85″ WC, the switch responds to pressurization variation by opening or closing the electrical circuit when predetermined draft conditions are reached. It is connected to the inducer and combustion sections in gas-fired HVAC systems, where airflow verification is necessary before ignition sequence continuation. Pressure-responsive switching assists with combustion airflow confirmation, operational sequencing, and protective shutdown control during restricted venting or inadequate draft conditions
