I use 422B on all the rooftop package units here and even on the walk in Coolers. Been using it a few years now haven't had any problems with it and it's cheap compared to others. I personally stay away from that Mo 99 stuff cuz it has had issues.
I know a lot about a lot of things BUT I still have a lot to learn. Life is what you make of it. So, why not make a working machine to make it easier.
