{"product_id":"patterson-kelley-26-0000-0059","title":"Patterson-Kelley 26-0000-0059 Pressure Switch","description":"\u003cp\u003eThe \u003cstrong\u003ePatterson-Kelley 26-0000-0059\u003c\/strong\u003e is a high-sensitivity \u003cstrong\u003eboiler air pressure switch\u003c\/strong\u003e engineered for precise combustion air proving in industrial HVACR systems. As a critical safety interlock, this \u003cstrong\u003eOEM replacement part\u003c\/strong\u003e monitors the pressure differential created by the blower to ensure hazardous flue gases are properly exhausted before the ignition sequence begins. Designed for heavy-duty performance, the \u003cstrong\u003e26-0000-0059 pressure switch\u003c\/strong\u003e features an adjustable operating range of 25-100 PSI with tunable pull-in and pull-out points, allowing technicians to calibrate the logic specifically for \u003cstrong\u003ePatterson-Kelley MACH boilers\u003c\/strong\u003e and other high-efficiency condensing units. The rugged construction and high electrical rating of 15A at 125\/250VAC provide reliable switching in demanding mechanical environments. When troubleshooting a system lockout or an air proving fault, replacing a fatigued diaphragm with this genuine \u003cstrong\u003ePatterson-Kelley air switch\u003c\/strong\u003e ensures the control board receives the necessary signal to proceed with the pre-purge and firing cycles, maintaining both system uptime and operational safety.\u003c\/p\u003e\n\n\u003cstrong\u003eKey Benefits\u003c\/strong\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCombustion Air Proving:\u003c\/strong\u003e Ensures safe ignition by verifying sufficient airflow through the heat exchanger and flue.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdjustable Pressure Settings:\u003c\/strong\u003e Features a 25-100 PSI range for precise field calibration to manufacturer specifications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRobust Electrical Output:\u003c\/strong\u003e Heavy-duty 15A rating supports reliable communication with standard 120V or 240V control circuits.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSystem Protection:\u003c\/strong\u003e Acts as a fail-safe to prevent carbon monoxide buildup or burner operation under blocked flue conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOEM Compatibility:\u003c\/strong\u003e Exact-fit replacement for specified Patterson-Kelley models, eliminating the need for mounting modifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cstrong\u003eCommon Questions\u003c\/strong\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the symptoms of a failing boiler pressure switch?\u003c\/strong\u003e\u003cbr\u003e\nCommon indicators include the combustion blower running without ignition, intermittent system lockouts, or specific \"Air Proving\" error codes on the NURO or ENVI control interface.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan this switch be used in both condensing and non-condensing applications?\u003c\/strong\u003e\u003cbr\u003e\nYes, its high-sensitivity design makes it suitable for various Patterson-Kelley boilers, provided the required pressure thresholds match the 25-100 PSI adjustable range.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow do I test the 26-0000-0059 during a service call?\u003c\/strong\u003e\u003cbr\u003e\nTechnicians should use a multimeter to check for continuity across the terminals. The switch should be normally open and close only when the blower generates sufficient differential pressure to move the internal diaphragm.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong style=\"color: red;\"\u003eThis item is not eligible for free shipping.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDisclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.\u003c\/p\u003e","brand":"Patterson-Kelley","offers":[{"title":"Default Title","offer_id":43381699051698,"sku":"26-0000-0059","price":62.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/Pic_f12b7bf3-ab7d-47ea-8e83-e3f69ef1ed4e.png?v=1776716094","url":"https:\/\/www.gsistore.com\/products\/patterson-kelley-26-0000-0059","provider":"GSIstore","version":"1.0","type":"link"}