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If you want to cool using a plant loop, then choose a CoolingCoil:Water instead of a CoolingCoilDX object. Then create a water loop with an air or water cooled chiller, depending on your use case. Water cooled if you will have a cooing tower.
On the HVAC tab of the OpenStudio application if you click the green plus at the top left you will open a dialog to make various HVAC systems. If you choose "Packaged Rooftop VAV with Reheat" you can inspect the resulting system that has an air loop serving the zones, a chiller water loop, and a condenser water loop.