Worries me a bit ive been setting a ton of York for the past 6 months. No problems so far except for one dry charge that had a leak right out of the box. Tiny nick in the channel which they quickly shipped any paid 4 hrs labor for me to replace
I have been installing Nordyne units with microchannel condensers for 3 years now and have not had a single problem with them except that in the beginning they were coming shipped with very little refrigerant in them. Some only had vapor. I was concerned that they had leaks. Tech support assured me the problem was they were having trouble getting the full charge into the microchannel coil at the factory.
I filled them up and there were no leaks. They apparently figured out how to jam all the refer in now because they seem to be shipping with something at least close the nameplate charge.
I have not had to pump one down yet, but I suspect it will be a challenge for all but the shortest linesets.
I've replaced between 25 to 30 leaking all aluminum microchannel outdoor coils under warranty this summer. Its left bad taste in my mouth for microchannel coils. The only reason for using them is to get the same heat transfer with less materials & less freon so its basically cheaper to make the units. I'll stick with the old stuff as long as I can.
Add the fact that Carrier plasters about ten stickers warning to use "Only Water" to clean the cond coil. Guess any Chemicals will murder the coil.