{"product_id":"tjernlund-products-950-0476","title":"Tjernlund Products 950-0476 Fan Prover Kit","description":"\u003cp\u003eThe \u003cstrong\u003eTjernlund Products 950-0476 Fan Prover Kit\u003c\/strong\u003e is a critical safety component designed for \u003cstrong\u003ecommercial PAI series\u003c\/strong\u003e intake hoods and draft inducer systems. This kit functions as a differential pressure-sensing mechanism that confirms the \u003cstrong\u003emechanical draft\u003c\/strong\u003e is established before allowing the heating or ventilation equipment to fire. Engineered for high-reliability applications, the \u003cstrong\u003e950-0476 fan prover\u003c\/strong\u003e monitors real-time airflow to prevent hazardous conditions caused by restricted venting or mechanical failure. As a veteran-grade \u003cstrong\u003eHVAC replacement part\u003c\/strong\u003e, this assembly integrates seamlessly with the \u003cstrong\u003eTjernlund UC1 Universal Control\u003c\/strong\u003e and other interlock circuits. The kit includes the sensing switch, flexible pressure tubing, and necessary mounting hardware to ensure a precise \u003cstrong\u003epressure switch calibration\u003c\/strong\u003e. By verifying that the inducer is moving air at the required velocity, this kit safeguards the heat exchanger from thermal stress and ensures total compliance with modern venting safety codes in both residential and commercial mechanical systems.\u003c\/p\u003e\n\n\u003cstrong\u003eKey Benefits\u003c\/strong\u003e\n\u003cul\u003e\n  \u003cli\u003eEnsures consistent \u003cstrong\u003eHVAC system safety\u003c\/strong\u003e by preventing operation during airflow failure.\u003c\/li\u003e\n  \u003cli\u003eDirect \u003cstrong\u003eOEM replacement part\u003c\/strong\u003e for Tjernlund PAI-series commercial intake hoods.\u003c\/li\u003e\n  \u003cli\u003eIncludes high-temperature flexible tubing to withstand demanding mechanical room environments.\u003c\/li\u003e\n  \u003cli\u003eProvides a normally open (NO) contact that closes only upon successful \u003cstrong\u003efan operation detection\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003cli\u003eSimplifies the \u003cstrong\u003eventilation monitoring\u003c\/strong\u003e process for contractors through a straightforward two-wire integration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cstrong\u003eCommon Questions\u003c\/strong\u003e\n\u003cp\u003e\u003cstrong\u003eHow do you troubleshoot a Tjernlund fan prover switch that won't make?\u003c\/strong\u003e\u003cbr\u003e\nFirst, inspect the \u003cstrong\u003ePAI-series prefilter\u003c\/strong\u003e and intake hood for debris. If the filter is clear, check the sensing tubing for kinks or cracks. Use a manometer to verify that the draft inducer is producing sufficient pressure to satisfy the \u003cstrong\u003efan prover kit\u003c\/strong\u003e settings.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this kit compatible with other draft inducer brands?\u003c\/strong\u003e\u003cbr\u003e\nWhile designed specifically for Tjernlund PAI and commercial venting systems, the \u003cstrong\u003e950-0476\u003c\/strong\u003e functions on standard differential pressure logic. Always verify the specific pressure trip point (WC) against your system requirements before installation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat wiring configuration is required for the 950-0476?\u003c\/strong\u003e\u003cbr\u003e\nTypically, the blue lead is connected to Common and the yellow lead to the Normally Open (NO) terminal. This ensures the circuit only completes once proper \u003cstrong\u003emechanical draft\u003c\/strong\u003e is achieved.\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":"Tjernlund Products","offers":[{"title":"Default Title","offer_id":43465311387826,"sku":"950-0476","price":149.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/Pic_c349c574-0082-42b3-8076-db06cabfbbea.png?v=1701803976","url":"https:\/\/www.gsistore.com\/en-ca\/products\/tjernlund-products-950-0476","provider":"GSIstore","version":"1.0","type":"link"}