{"product_id":"773-128","title":"773-128","description":"Ensure the safe and efficient operation of your high-efficiency heating system with this premium 2-stage air pressure switch. As a critical safety component, this air proving switch monitors the negative pressure generated by the inducer fan motor to verify that the furnace is venting combustion gases properly before allowing the ignition sequence to begin. Designed specifically for two-stage gas furnaces, this switch features dual setpoints to accurately manage airflow requirements for both low-fire and high-fire heating cycles. If your furnace is experiencing ignition failure, frequent cycling, or displaying pressure-related error codes, replacing a faulty air switch is essential for restoring reliable performance. This durable, factory-calibrated component is engineered to provide precise pressure sensing and long-lasting reliability in demanding HVAC environments.\u003cbr\u003e\nType: Air Pressure Switch\u003cbr\u003e\nSize: Small\u003cbr\u003e\nApplication: Used in high-efficiency 2-stage gas furnaces and residential HVAC heating systems to monitor inducer motor draft and ensure proper exhaust venting.\u003cbr\u003e\nSpecifications: Dual-stage operation; Setpoints: -0.20\" WC (Water Column) and -0.55\" WC; Diaphragm-actuated air proving sensor.","brand":"BCFurnace","offers":[{"title":"LENNOX PRESSURE SWITCH 2-STG -0.20\" WC \/ -0.55\" WC \/ 773-128","offer_id":47251298025757,"sku":null,"price":70.43,"currency_code":"CAD","in_stock":true},{"title":"LENNOX PRESSURE SWITCH 2-STG -0.20\" WC \/ -0.55\" WC \/ 102737-03","offer_id":47251298091293,"sku":null,"price":70.43,"currency_code":"CAD","in_stock":true},{"title":"LENNOX PRESSURE SWITCH 2-STG -0.20\" WC \/ -0.55\" WC \/ 69W55","offer_id":47251298058525,"sku":null,"price":70.43,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/7298\/9981\/files\/0909f38a555c4a57b37687778f7eab86.webp?v=1773958015","url":"https:\/\/bcfurnace.myshopify.com\/products\/773-128","provider":"BCFurnace","version":"1.0","type":"link"}