Description
The York S1-02436217000 SPNO Air Pressure Switch is a sensing control component used to monitor airflow conditions within the inducer or duct assembly. It operates at a 0.20-inch water column fall-on threshold and changes state when draft conditions reach the calibrated level, allowing the control board to change proper venting before ignition. In residential and light commercial HVAC systems. The switch integrates into the furnace control system and supports safe sequencing of ignition, ensuring the inducer motor establishes adequate draft before gas valve activation and heating operation begins.
