The AHU Discover Wizard should be run only after a WEMScontroller3 has been discovered and set up with the appropriate analogue inputs and outputs (AHU Supply Fan, AHU Heating Stages, AHU Cooling Stages, etc.). For a guide on how to set up an AHU for the first time, see the AHU First-time Setup guide.
If a WEMScontroller3 has already been configured with the appropriate analogue inputs and outputs, the AHU Discover Wizard can be used to add an AHU to the Floorplan.
For a guide on the wizard, see Run The AHU Discover Wizard.