773-203

This York Pressure Switch is a critical safety component designed for high-efficiency HVAC systems and gas furnaces. Functioning as an air proving switch, it monitors the negative pressure generated by the draft inducer motor to ensure that the combustion environment is properly vented before the ignition cycle begins. With a precise calibration of 0.90" WC (Water Column), this switch protects your heating system by preventing operation if it detects insufficient airflow or a blocked flue. It is an essential replacement part for restoring reliable performance in furnaces experiencing ignition failure or pressure switch lockout errors, ensuring both home safety and equipment longevity.
Type: Air Pressure Switch
Size: Standard HVAC Component
Application: Used in residential and commercial gas furnaces and air handlers to verify proper ventilation and exhaust airflow during the heating cycle.
Specifications: Pressure Rating: 0.90" WC (Water Column); Function: Air Proving and Safety Interlock; Type: Diaphragm-actuated sensing switch.