As you are already experiencing pains and joy of transiton from R22 to 410a. My question is, what is the evacuation level you must achieve when working with 410a? I have heard different stories from different people. I aim to achiev at least 1000 microns and not to have a rise of more than 300 microns when replacing a major component for R22. in an old system. R410 and POE oils are more sensitive to moisture and I have not done very many 410a system installs yet. What is your take on the evacuation levels when you install or replace major component in a system with 410a? Is 1000 micron sufficient? Is there an industry standard for evacuation?
I would appriciate all the help and comments.