I'm working on an eQuest model that uses a dedicated outside air system serving a number of terminal unit heat pumps. I have created a dummy zone for the DOAS to serve and am using the "OA-FROM-SYSTEM" for the heat pump zones to get outside air from the DOAS. In the design, the DOAS fan is running at part load, and at economizer conditions, increases speed to the maximum economizer airflow. Is there any way to model the economizer mode in this case?

Thanks,

Todd Lagus, EIT