[Equest-users] Fresh air control according to CO2 concentration in DOAS +FCU

[tiejun hu]

HI  equester:
        I am working on project in which fresh air  is controled by CO2 concentration, in my model, every room has FCU, and all fresh air provied by DOAS controling a dummy room. so the fresh air volume of this system is sum of all room served by FCU. and to realize this control , in every system tab, i choose DCV return sensor,  but i don't kown how to setup the fresh air system(DOAS), if i also choose  DCV return sensor, i think the volume of air provided by system is unchanged, because people im dummy room is 0. i tried to input number of people in room tab and total heat for 0,but is unaccepted by software. so this method is not ok.
       dose any people can guide me? note that:my fresh air volume of DOAS must reflect requirement of all room served by FCU.
       any words will be apreciated! 
BEST REGARDS!                                                                                                                                
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