Originally Posted by
dlc
I read it too, the point the article made was that it
is virtually impossible to pull moisture from poe oil
by system evacuation. which given the conditions the a/c guys work in, makes you wonder why the industry is going to 410a. however system design and driers will do the work. also it seems most guys have a different interpretation of 'a good vacuum', so many micron guages available but no time alloted to actually leave it on the pump to acheive a good vacuum. i remember starting out and looking back it was amazing when helping the journeyman do a compressor change on a rooftop unit, the time it took to have a coffee was long enough for evacuation.
ahh the good old days of r-22