Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
We've found this to be an issue as well. The documentation for the Controller:OutdoorAir object states that the input for Minimum Fraction of Outdoor Air Schedule Name "overrides Minimum Outdoor Air Schedule and Minimum Outdoor Air Flowrate." However, we found this IS NOT true and that using Minimum Outdoor Air Schedule by itself works fine. This field should be set to the same HVAC Operation Schedule you defined above.
The documentation for the AvailabilityManager:NightCycle object doesn't explicitly say it, but I'm guessing that when it cycles on fans during unoccupied periods, it is programmed to bring in minimum OA. This would explain why setting the MINIMUM OA to zero through the Minimum Outdoor Air Schedule input field instead of the MAXIMUM OA would cause night cycling to stop introducing outside air.
