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3 tons
3 ton
1.5 ton
Two and a half ton
1.5 ton
Two and a half ton
The B19 is the model or series. The 51 is the tonnage( the unit is actually a four ton unit with the coil being a little bigger for increased efficiency.
trane air handler tonnage for model BWV760P100A1
Usually stamped on the outside of the handler.
2.5 tons
TM2005 06905
The air handler does not have a tonnage rating, the evaporator coil within it is what you`re looking for since any given air handler can accomodate several different coil sizes. For the answer to your tonnage question see the tag on the coil, though that may prove to be difficult since it is enclosed in the plenum. An easier method would be to get the tonnage from the condenser model # in the yard.