Just as a theorical matter .

Despite it can not reach the low temperature as in R502 , what will be the performance if the equipment is charged, vacuum first, with R22. It is a hermethic , about 2.5 hp

Of course I know that both gas are banned , but actually I can use R22 in my country, Argentina.
And I do not need to reach so low temperature. -5ºC evaporator is enough