Are you installing a split and run a lineset to the attic handler? Running the water loop to the air handler doesn't seem right to me.
[A prior house of mine had a 5ton WF for my main floor and a 2.5ton Bosch in my attic for my 2nd floor.]
[A prior house of mine had a 5ton WF for my main floor and a 2.5ton Bosch in my attic for my 2nd floor.]