The Fasco D189 is a single-speed motor

Always verify the model number on the unit nameplate to ensure this specific Lennox 1-stage LP kit or 2-stage compatible spring is the correct match for your burner manifold configuration

Smith industrial water heating units

This board is utilized across various Carrier

while longer runs may require 1/4" or 1/2" ID tubing to maintain signal integrity and avoid pressure lag

Carrier 326643-703 Burner 321894-709 The Fasco D189 is aThe Carrier 326643 703 Burner is a critical 4 inch inshot burner assembly designed for high efficiency gas furnaces. As a veteran grade OEM furnace replacement part, this component ensures precise fuel to air ratios, facilitating a stable and consistent flame pattern essential for optimal heat exchange. Engineered for Carrier, Bryant, and Payne residential and commercial heating units, this assembly features a compact profile, measuring approximately