Great forum! I'd like to tap into your expertise if I may.
I plan to replace my existing 3.5T R22 central AC system (14 years old and getting leaky). I'm tending toward an R410-based system (American Standard), but have the following questions:
1. I hear alot of talk about flushing lines, but can the inside coil also be flushed? My current coil is a replacement installed last spring, so it's only a year old. The fellow who quoted me the 410 system checked the coil and said it was rated for both R22 and R410. I'd like to use it, but am wary given the comments regarding incompatibility of oils, etc. I would guess that coils are more difficult to flush than lines.
2. Are linesets for R410 systems generally larger diameter than those for R22 systems? I understand the issues regarding flushing the lines, but I've also seen some comments about line sizes being different. If so that would be one reason to bite the bullet and get a new lineset.
Obviously, for cost reasons I'd like to use the existing lineset and coil. But I don't want to be causing myself problems down the road. Do you guys have any advice for me? Thanks.