how i need to model that to comply with model actual equipment a

There is a fan system that will supply outdoor air for the building, This system is a big injection fan that will supply air to all zones that is completed designed and all the zones that are not completed designed (just the outdoor air had been designed), for the zones designed, there will be fan coil units. For the other zones, I don't know (Surely will be Fan coils units) As my baseline is system 8, i have modeled the proposed case in the zones completed designed easily, but for the zones that is not completed designed i have model the system fan (big injector fan) and in the interior zones the equipment as in the baseline, the diference that i have see is that my fan system have been designed just to supply outdoor air, not to be a function of cooling. So, it don't met the setpoint temperature because it need more outdoor air than my system can supply. When i use Fan coils unit it met the setpoint temperature. Another option is model a VAV system instead of my injector fan. Please, how i need to model that to comply with model actual equipment and for zones not completed designed like the baseline? Thank in advance.