Quote Originally Posted by Filthy View Post
it sounds like one for each type of refrigerant and possibly more than one of each depending on its capacity. cant put 100 pounds of freon in a 50psi tank
Yes, one for each type of refrigerant, this being because the systems do not use the same type of oils for the compressors/systems. Usually 30lb cylinders, by weight as well. There's a scale that is used to measure amount of refrigerant used so they know how much to charge a customer.