Hi everyone! I have a rare find! My neighbor has an old Janitrol Ac/Gas package unit furnace and believe it or not, the AC section is in good shape! In this economy he needs the AC which is still working, but low on refrigerant, repaired. We decided to gut the Gas Furnace part and it is fairly easy to just pull the heat exchanger and gas related parts and chuck' em.
My question is refrigerant. If the ID info is mostly missing on such an old unit, February 13th 1964, will this unit likely have refrigerant 500?
I haven't really delved into it yet, but I'm about to go exploring trying to help my buddy out! Thanks!