That's not what I've been told. On the DuPont site on the web I found this:
R-410A is designed for new equipment only, due to its much higher cooling capacity and operating pressure. R-410A is a higher-pressure refrigerant than R-22 and should be used only in equipment specifically designed for R-410A . . .working with R-410A is not much different than any other refrigerant. However, R-410A does have higher pressure and can become combustible when mixed with air . . . The vapor pressure of R-410A (at 70° F) at 201 psig is higher than R-22 at
136 psig . . . Dave Bateman is a senior technical service engineer for DuPont Refrigerants and has been providing customer technical support for DuPont and Suva refrigerants for the past 17 years. For more information, send e-mail to snipped-for-privacy@USA.dupont.com or visit
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Dupont makes the stuff, and I've always heard that the new stuff ran at higher pressures, but there's been more than one occasion where everything I knew had changed out from under me. Got any citations or further information about why the OP was wrong about what he said? Or is this a Clintonesque 'what is the meaning of "is"' sort of word game?
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-- Bobby G.