{"product_id":"tjernlund-products-950-0640","title":"Tjernlund Products 950-0640 Limit Switch","description":"\u003cp\u003eThe \u003cstrong\u003eTjernlund Products 950-0640\u003c\/strong\u003e is a critical \u003cstrong\u003eL135F High Limit Switch\u003c\/strong\u003e designed specifically for \u003cstrong\u003eSS1 and SS1-R Side Wall Vent Systems\u003c\/strong\u003e. As a veteran technician knows, maintaining the safety circuit in power venting applications is non-negotiable. This \u003cstrong\u003enormally closed switch\u003c\/strong\u003e monitors internal temperatures and triggers a burner lockout if it detects an overheat condition, effectively preventing equipment damage or hazardous exhaust scenarios. Engineered for \u003cstrong\u003ehigh-temperature sensing\u003c\/strong\u003e, it integrates seamlessly with the \u003cstrong\u003eUC1 Universal Control\u003c\/strong\u003e board to provide reliable \u003cstrong\u003ethermal protection\u003c\/strong\u003e in residential and light commercial \u003cstrong\u003eHVAC exhaust systems\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003eWhen troubleshooting a \u003cstrong\u003eventer lockout\u003c\/strong\u003e, verifying the continuity of the \u003cstrong\u003e950-0640 limit control\u003c\/strong\u003e is a primary diagnostic step. This \u003cstrong\u003eOEM replacement part\u003c\/strong\u003e features a rugged construction that withstands the demanding environment of a venter cabinet. Its precise \u003cstrong\u003eL135F temperature trip point\u003c\/strong\u003e is factory-calibrated to ensure the \u003cstrong\u003esafety limit switch\u003c\/strong\u003e responds accurately to flue gas temperatures, maintaining \u003cstrong\u003esystem interlock integrity\u003c\/strong\u003e. For contractors performing \u003cstrong\u003epower venter maintenance\u003c\/strong\u003e, keeping this switch on the truck ensures you can restore \u003cstrong\u003eventing safety standards\u003c\/strong\u003e without multiple site visits.\u003c\/p\u003e\n\n\u003cstrong\u003eKey Benefits:\u003c\/strong\u003e\n\u003cul\u003e\n  \u003cli\u003eEnsures precise \u003cstrong\u003eoverheat protection\u003c\/strong\u003e for \u003cstrong\u003eTjernlund SS1 and SS1-R\u003c\/strong\u003e models.\u003c\/li\u003e\n  \u003cli\u003eDirect \u003cstrong\u003eOEM replacement\u003c\/strong\u003e guarantees exact fit and \u003cstrong\u003eterminal compatibility\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003cli\u003eCritical for maintaining the \u003cstrong\u003esafety interlock\u003c\/strong\u003e circuit between the burner and venter.\u003c\/li\u003e\n  \u003cli\u003eRugged \u003cstrong\u003ehigh-temperature construction\u003c\/strong\u003e for long-term field reliability.\u003c\/li\u003e\n  \u003cli\u003eEssential component for code-compliant \u003cstrong\u003eside wall venting\u003c\/strong\u003e installations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cstrong\u003eCommon Questions:\u003c\/strong\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWhat does an L135F rating mean for this switch?\u003c\/strong\u003e It indicates the switch is designed to trip and open the circuit when temperatures reach 135 degrees Fahrenheit, protecting the \u003cstrong\u003epower venter\u003c\/strong\u003e components.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIs the 950-0640 a manual or auto-reset switch?\u003c\/strong\u003e This specific \u003cstrong\u003ehigh limit switch\u003c\/strong\u003e typically requires a manual reset to ensure a technician inspects the cause of the overheat condition before the system resumes operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHow do I test if my Tjernlund limit switch is defective?\u003c\/strong\u003e With power disconnected, check for continuity across the terminals. Since it is a \u003cstrong\u003enormally closed (NC) switch\u003c\/strong\u003e, a lack of continuity at room temperature indicates a failed component or a tripped state.\u003c\/li\u003e\n\u003c\/ul\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":"Tjernlund Products","offers":[{"title":"Default Title","offer_id":43465312731314,"sku":"950-0640","price":112.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/Screenshot_2023-11-30_135524-removebg-preview.png?v=1701381389","url":"https:\/\/www.gsistore.com\/products\/tjernlund-products-950-0640","provider":"GSIstore","version":"1.0","type":"link"}