I'm modeling humidity control of Data Center in Office Building. RH need to be controlled as 40%~60% in Data Center, 50% and lower in other zones occupied. A VAV reheat system control every floor, for 5 zones occupied, and 1 data center. Desiccant system has been set in every VAV airloop to dehumidification, but for terminal, only one zone(data center) need humidifer, but when I put it after reheat coil of data center, some errors occured. So how can I reach this target?