NORDYNE Receives Patent on Heat Pump Defrost Board

Dec. 4, 2014
Defrost happens from two directions to ensure even coverage.

St. Louis, December 4, 2014 — NORDYNE, a subsidiary of Nortek, Inc. (Nasdaq: NTK) recently received a patent for their defrost process on split-system heat pumps with Micro-Channel condensing coils. U.S. patent 8,869,545 makes thorough defrosting possible on heat pumps that use all-aluminum coils.

Traditional tube-in-fin heat pumps have coil headers on the sides and defrost horizontally. But in a Micro-Channel heat pump, the coil is rotated 90 degrees so that the headers are on the top and bottom, not the sides. If the defrost started from the top down, the bottom of the coil would never defrost completely.

The NORDYNE patented process adds a hot gas bypass so that hot gas goes from the top-down as well as the bottom-up, ensuring the entire coil gets defrosted.

Contractors and distributors who would like to see this defrost process in action can watch a YouTube video at


A trusted name in the industry, NORDYNE has been designing and manufacturing reliable heating and cooling products for more than 95 years. The company focuses on creating genuine value for its customers through a unique combination of innovation, product performance and responsive support. NORDYNE builds solid residential systems for high-end brands including Maytag, Broan, Frigidaire, NuTone, Tappan and Westinghouse. To learn more about NORDYNE and its product offerings, please visit

NORDYNE is a subsidiary of Nortek, Inc. a global, diversified company whose many market-leading brands deliver broad capabilities and a wide array of innovative, technology-driven products and solutions for lifestyle improvement at home and at work. Please visit for more information.

Maytag is a registered Trademark of the Maytag Corporation.
Trademarks Frigidaire, Maytag, Tappan and Westinghouse used under license.