Dear all,

The building is to have a child water system with fan coils and 2 FAHU (fresh air handling unit)

First:
As ASHRAE 90.1 you should model the residential building with PTHP if you dont have a heating source, But the problem after modeling the proposed case with the 3 chillers and 2 FAHU the load become apro. 4 MW rather than in baseline case its 3.4 MW ?????

should I model FAHU's in the baseline case also 

second:

when you define air side systems in DD wizard at the beginning, before detailed  mode, I cant choose fan coil units, I have putted " Parallel fan powered (no reheat) as there is no fan coil option on the beginning
so in the detailed mode when i changed the type of each unit from PIU to fan coil i had many errors related to the CHW Loop

what shall i do???

Thanks for any help