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It is possible to setup primary secondary systems with a single plant using the built in common pipe model of PlantLoop. OpenStudio supports this feature programmatically and the CBECC engine is in fact making use of this feature. The key is setting up the model the way your schematic shows AND also setting the "Common Pipe Simulation" property of PlantLoop to common pipe. We generally discourage this approach although it is proven to work in the configurations that CBECC supports (no variable speed branch pumps). In an effort to steer you in the direction described here we have explicitly hidden the "Common Pipe Simulation" in the OpenStudio Application. Models coming out of CBECC will have the common pipe enabled, but you wont be able to manipulate this property in the OpenStudio application. You can however use an OpenStudio Measure to programmatically set the common pipe simulation using this method.