Found out today that the scroll in them is coming with POE oil in it, not mineral oil as you'd expect. Idea behind that is using R407C instead of much more expensive R22. That gas is approved by Nordyne for warranty purposes. But we're back to the old POE and mineral oil issue. Local tech rep says blow the he!! out of things with nitro or even use an RX11 flush. Of course that adds cost to the job and most dry unit jobs are wanting bottom dollar. But then you could save by using 407C and not worrying about oil.
One of our guys went to a class on refrigerants recently. He was told that Copeland may be shipping replacement 22 compressors with POE in them. Wonder how they'll identify them and any procedures they'll want done. Cornfusing.