I am sure most of you may have come across a situation like this.
Walk-in cooler at a convenient store. Do not have any data plate, No markings/notations what so ever that tells you what gas is in it. The owner says guy comes every few months and charge it and I pay lot of $$$. What he is putting in it is a mystery. I do not want to rely on pressure readings alone. 240/65. Could be r22? 50 degrees. I know some of you will suggest retro, change over to a clean refrigerant and that is all good.
My question is, is there any type of analyzer available to determine type of refrigerant in the system? I found some that are only for automotives only. What would you do in a situation like this? Need some tips from refrigerant gurus out there.