{"product_id":"nti-84039-dual-sensor-supply-return-tft300-399","title":"Nti 84039 Dual Sensor Supply Return TFT300-399","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe NTI 84039 is a dual temperature sensor assembly covering both supply and return lines, designed for use in hydronic boiler systems. This replacement part monitors water temperatures entering and leaving the heat exchanger, providing the control system with the data it needs to regulate firing cycles and maintain setpoints. Licensed HVAC technicians and plumbers working on NTI boiler installations will recognize this as a direct OEM-style replacement that restores accurate temperature sensing when a sensor fails or reads out of range.\u003c\/p\u003e\u003cp\u003eThis sensor assembly is intended for residential and light commercial hydronic heating systems equipped with NTI TFT300-399 series boilers. The dual configuration means a single part addresses both the supply and return sensing points, reducing parts count and simplifying the service call. It is sold individually and ships as a single unit.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eDual-function design monitors both supply and return water temperatures in one assembly\u003c\/li\u003e\n\u003cli\u003eOEM replacement part for NTI TFT300-399 series boilers\u003c\/li\u003e\n\u003cli\u003eRestores accurate temperature feedback to the boiler control board\u003c\/li\u003e\n\u003cli\u003eSold as a single unit for straightforward parts ordering\u003c\/li\u003e\n\u003cli\u003eDirect fit reduces diagnostic guesswork and installation time\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a replacement sensor for NTI TFT300-399 series boilers. Manufacturer part number 6000084039 is an alternate reference for this component.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed plumber or HVAC technician familiar with hydronic boiler systems. Always shut down the boiler and allow the system to cool before removing any sensors or disturbing pressurized water lines. Follow all local mechanical codes and the boiler manufacturer's service documentation when replacing sensors. Verify sensor seating and connection integrity before restoring power and initiating a test cycle.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack Size\u003c\/strong\u003e: 1 each\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType\u003c\/strong\u003e: Replacement Part\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: NTI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 84039\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"NTI","offers":[{"title":"Default Title","offer_id":51149607797042,"sku":"84039","price":69.11,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/00007733.png?v=1778598427","url":"https:\/\/voomisupply.com\/products\/nti-84039-dual-sensor-supply-return-tft300-399","provider":"Voomi Supply","version":"1.0","type":"link"}