I am trying to control a MAU that serves corridors in a apartment building to do a night setback of 50% airflow in OpenStudio. The unit is 100% outdoor air. The fan is variable. I have tried using the Maximum Fraction of Outdoor Air Schedule because it is the only input that allows a 0-1 fractional schedule, but this does not seem to be working. Has anyone been successful in implementing a measure like this? It seems like this should be a common control strategy and would be used in other applications like labs.
On another note, I am running into a weird outdoor air issue. On a VAV system, the outdoor air flow rate I put into the Design Outdoor Air Flow Rate in the OS:Sizing:System object and the Minimum Outdoor Air Flow Rate in the OS:Controller:OutdoorAir object overrides the Design Specification Outdoor Air from the zones. With the MAU system (it is controlled like a single zone system) the Design Specification Outdoor Air from the zones overrides the Design Outdoor Air Flow Rate and Minimum Outdoor Air Flow Rate. Does anyone know why this is?
