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I have files with this EMS actuator working. I used the calling point InsideHVACSystemIterationLoop, because this is the sort of the thing you want to be updating during the system subtimesteps. Check output results at the detailed frequency.

The rest of the air handler needs to be setup to be able to operate at the flow request. Would need more information to help much. A VAV fan might be needed if you are trying to run at lower flow rates. The sizing could be holding it back if you are trying to run at higher flow rates.