Description
The Reznor RZ201158 Air Pressure Switch is a -1.10″ WC vacuum-rated sensing unit that responds to negative pressure changes by opening or closing an electrical circuit. It is applied in gas-fired heaters and ventilation equipment, where it verifies proper draft or airflow created by the inducer fan before ignition proceeds in HVAC systems. This switch operates through diaphragm movement that reacts to pressure differentials and changes contact state accordingly. Positioned along the air or venting line, it ensures draft conditions are present and signals system readiness.
