2.5 tons
That isn't a typical Rheem model number, are you sure that isn't the serial? If it is the model number it is a 2.5 ton :)
2
5 Tons
2.5
2 ton
3 ton
5 ton
five ton
5 tons, denoted by the 60 in the model #, (5x12=60).
Your first set of numbers gives you the tonnage, so this is a 2 ton; your "4" number represents a 460-volt electrical requirement
2.5 tons. 1 ton =12,000 btu so 30,000 btu=2.5 tons. The 30 in the model # denotes btu of the unit in 1000`s.
The Rheem RAMC-048JBZ condenser has a nominal cooling capacity of 4 tons. This is typically indicated by the "048" in its model number, where each ton of cooling capacity is equivalent to 12,000 BTU/h, resulting in a total capacity of 48,000 BTU/h for this unit.