Is 408a a drop in for 502
yes 408A is used as a replacement for 502 systems , cant mix the 2 gasses
We have a tech on call and he has has a walkin that is flat with 502 on the txv and no other markings. We are trying to get them up and running tonite
Thanks for the reply hope we can get them going
Hope it worked out for you.
If running mineral oil you may run in to an issue.
Keeping the Ice Cream Frozen!
MO-79, R-422A is worth looking into.
We are having good success with MO-59 for R-22 sub on a similar note.
Otherwise HP-80 is the best older substitute.
Trouble is having the right jug on the truck. He found the leak on a solenoid valve so he had to go back