Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The default Setpoint Manager (SPM) is schedule-based, but OpenStudio allows you to apply many different types of SPMs, including one specifically for applying outdoor air reset. In the HVAC Systems tab, while viewing your boiler loop, scroll through the Library list of HVAC components on the right. You should find a line item for "Setpoint Manager Outdoor Air Reset" (see below).
Drag and drop this item onto the last node of your supply side, replacing the schedule SPM. Then, you can click on the new orange tag icon representing the OA reset SPM to edit parameters (see below).
For a primary-secondary loop, you may need to apply the same OA reset SPM to the supply side of the secondary loop. In your case, the loop where the "water heater" serves the service hot water draws.
