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.
5 Tons
3.5
2 tons
3.5 Tons
3 1/2 ton
It's 2
2 Ton
5 Tons
5 ton 10 seers
48 -> 48000 BTU -> 3 ton
TONAGE AND SEER SPECS FOR MY rUUD mODEL UBHC-17J11SFD
approx. 4 tons