{"product_id":"tjernlund-products-950-0471","title":"Tjernlund Products 950-0471 Fan Prover Kit","description":"\u003cp\u003eThe \u003cstrong\u003eTjernlund Products 950-0471 Fan Prover Kit\u003c\/strong\u003e is a critical safety interlock designed for commercial \u003cstrong\u003ePAI-series intake hoods\u003c\/strong\u003e and induction systems. As a veteran-grade \u003cstrong\u003epressure switch kit\u003c\/strong\u003e, it serves as the primary mechanism to verify proper airflow before allowing the burner circuit to energize. This OEM \u003cstrong\u003eTjernlund 950-0471\u003c\/strong\u003e assembly features a high-precision diaphragm calibrated to \u003cstrong\u003e1.35\" WC PF\u003c\/strong\u003e, ensuring that the draft inducer or vent fan is moving sufficient air to prevent hazardous combustion conditions. The kit includes the sensing switch, mounting bracket, and required flexible tubing for a complete field replacement. For technicians troubleshooting \u003cstrong\u003eHVAC safety switches\u003c\/strong\u003e or \u003cstrong\u003edraft inducer proving switches\u003c\/strong\u003e, this unit offers a drop-in solution to resolve \"no-ignition\" codes caused by failing pressure sensors. Maintaining a functional \u003cstrong\u003e950-0471 fan prover\u003c\/strong\u003e is essential for compliance with mechanical codes regarding positive airflow verification in gas-fired equipment. Integration is straightforward for existing \u003cstrong\u003eTjernlund ventilation systems\u003c\/strong\u003e, utilizing standard blue (common) and yellow (normally open) wiring configurations.\u003c\/p\u003e\n\n\u003cstrong\u003eKey Benefits\u003c\/strong\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFail-Safe Operation:\u003c\/strong\u003e Prevents burner ignition until valid airflow is detected by the \u003cstrong\u003e1.35\" WC pressure switch\u003c\/strong\u003e, protecting the heat exchanger from overheating.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOEM Compatibility:\u003c\/strong\u003e Specifically engineered for \u003cstrong\u003eTjernlund PAI-7 intake hoods\u003c\/strong\u003e and commercial series in-forcers, eliminating the need for complex field modifications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Construction:\u003c\/strong\u003e Features a \u003cstrong\u003edurable mounting bracket\u003c\/strong\u003e and high-grade sensing diaphragm designed to withstand the cyclic nature of industrial HVAC operations.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrecise Draft Monitoring:\u003c\/strong\u003e Monitors \u003cstrong\u003esystem airflow\u003c\/strong\u003e with industrial accuracy, reducing equipment downtime caused by nuisance trips in low-draft environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cstrong\u003eCommon Questions\u003c\/strong\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I test if my Tjernlund 950-0471 pressure switch is defective?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBefore replacing, confirm the \u003cstrong\u003eintake hood air inlets\u003c\/strong\u003e and pre-filter screens are clear of debris. Check the \u003cstrong\u003eflexible sensing tubing\u003c\/strong\u003e for kinks or blockages. If the inducer is running and the tubing is clear but the switch fails to close the circuit across the blue and yellow terminals, the internal diaphragm or contact points may be compromised.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this kit compatible with other PAI series hoods?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003e950-0471\u003c\/strong\u003e is specifically calibrated for the commercial PAI series. While other kits like the 950-0452 exist for smaller PAI-1 or PAI-2 units, using the correct 1.35\" WC set point is vital for the safety of larger commercial induction systems.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat wiring configuration should be used for this fan prover?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eStandard installation involves connecting the system common to the blue terminal and the normally open (N.O.) lead to the yellow terminal. Always cycle the \u003cstrong\u003eheating equipment\u003c\/strong\u003e several times after installation to verify the proving sequence.\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":43465315975346,"sku":"950-0471","price":155.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/Pic_963b2533-e653-4324-91c1-44b0f6639d42.png?v=1701818746","url":"https:\/\/www.gsistore.com\/en-ca\/products\/tjernlund-products-950-0471","provider":"GSIstore","version":"1.0","type":"link"}