Last I knew Trane considered all of their vaporators high efficiency since you could change the piston size or add an expansion valve. The number you have there is not a 3-ton coil though, it's a 2 1/2 ton wide cabinet coil. I can;t remember the width but the 030 coil is the narrow 2 1/2 ton and the 031 is the wider 2 1/2 ton coil.
There are many equipment matchups with that coil with anything from a 1.5 ton outdoor unit to a 3 ton outdoor unit, depending on the outdoor unit and furnace used, and the desired total, sensable and latent BTUH required for the aplication.
It would definatly be considdered a high efficiency coil, since it matches up with 2.5 and 3 ton XL19i units.
If more government is the answer, then it's a really stupid question.
I am having a 2.5 ton XL15i installed soon with an XV90 furnace with variable speed. Is there much difference between the 2 coil selections, latent vs sensible. I am curious whether the larger coil will dehumidify as well as the smaller 030 coil. Is it significant whether it is a non- bleed or bleed type TXV? Is the bleed type easier on the compressor on startup?