100,000 btu input. The output depends on the efficienct rating of the furnace, ie 95%efficient = 95,000 btu output, 80% = 80,000 btu output.
Its a commercial unit that does heating and cooling.
Rheem model #RRNLB036JK10EBUA
Most manufacturers put a number related to Btu's of the unit in the model. If Rheem is no different then that 42 represents a 3.5 ton unit as there are 12,000 btu's / ton and 3.5 X 12 = 42.
This unit was manufactured in 1996.
2.5 ton unit
You need to look on the manufacturer's specification plate on the unit for the amperage and voltage.
That is a 2 1/2 ton unit. One ton of A/C = 12000 btu. The 30 in the model number refers to 30000 btu.
There is no set tonnage rating for furnaces, only the ac units which are attached to them. Since furnaces with multiple blower motor speeds can accommodate several different size ac units. To get your ac units tonnage, get the model # of the outdoor unit and repost.
The AHU unit does not have a tonnage rating, since all AHU`s can accept a number of different tonnage evaporator coils. Your best bet would be to post the condensing unit model and serial#`s.
4 tons, 48 in the model # is the unit capacity in 1000`s of btu (48,000), There are 12,000 btu in one ton. 48 divided by 12 = 4.