Nti 84039 Dual Sensor Supply Return TFT300-399

Product Description

The 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.

This 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.

Key Features

• Dual-function design monitors both supply and return water temperatures in one assembly
• OEM replacement part for NTI TFT300-399 series boilers
• Restores accurate temperature feedback to the boiler control board
• Sold as a single unit for straightforward parts ordering
• Direct fit reduces diagnostic guesswork and installation time

Compatibility

Designed as a replacement sensor for NTI TFT300-399 series boilers. Manufacturer part number 6000084039 is an alternate reference for this component.

Installation Notes

Installation 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.

Technical Specifications

• Pack Size: 1 each
• Type: Replacement Part

Standard Information

• Brand: NTI
• Manufacturer Part Number: 84039