The big push is on to replace R-22 unitary air conditioners and heat pumps, and it looks like the industry has really and truly decided that R-410A systems are “it.” This article offers an overview of some of the issues related to R-22 and -410A in the field: operating pressure differences, oil characteristics, and temperature glide.
The article contains comments from Todd M. Rossi, Jon D. Douglas, and Marcus Bianchi, all of Field Diagnostic Services, Inc., Langhorne, PA; and notes from the training departments of American Standard and Carrier Corp. For more detailed information, contact your equipment manufacturer and/or distributor.