{"product_id":"773-389","title":"773-389","description":"This high-quality air pressure switch is a critical safety component designed for modern HVAC systems and forced-air furnaces. As an 'air proving' switch, its primary function is to monitor the pressure generated by the inducer blower motor, ensuring that combustion gases are being safely exhausted before allowing the ignition sequence to proceed. Rated at 0.40\" WC, this switch features a Single Pole Normally Open (SPNO) contact configuration that closes once the required vacuum or pressure threshold is met. It is a common replacement part for heating systems experiencing ignition failure, intermittent shut-offs, or pressure switch lockout errors. Engineered for precision and long-term reliability, this switch helps maintain the safety and efficiency of your residential or commercial heating equipment.\u003cbr\u003e\nType: Air Pressure Switch\u003cbr\u003e\nSize: Standard\u003cbr\u003e\nApplication: Used in forced-air furnaces, HVAC units, and heating systems to monitor inducer fan performance and flue venting safety.\u003cbr\u003e\nSpecifications: 0.40\" WC (Water Column) set point, SPNO (Single Pole Normally Open) circuitry, air proving functionality.","brand":"BCFurnace","offers":[{"title":"YORK\/ETC PRESSURE SWITCH 0.40\" WC SPNO \/ 773-389","offer_id":50572733022493,"sku":null,"price":133.58,"currency_code":"CAD","in_stock":true},{"title":"YORK\/ETC PRESSURE SWITCH 0.40\" WC SPNO \/ 02435977000","offer_id":50572736790813,"sku":null,"price":133.58,"currency_code":"CAD","in_stock":true},{"title":"YORK\/ETC PRESSURE SWITCH 0.40\" WC SPNO \/ S1-02435977000","offer_id":50572733055261,"sku":null,"price":133.58,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/7298\/9981\/files\/20df5af92b2f46b2bdf7dde662a488c7.webp?v=1773964425","url":"https:\/\/bcfurnace.myshopify.com\/products\/773-389","provider":"BCFurnace","version":"1.0","type":"link"}