Question-and-Answer Resource for the Building Energy Modeling Community
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I've done this with an EnergyPlus measure to add an EMS program and required objects. I used sensors on the AHU availability schedule 'Schedule Value' and the return air node dewpoint temperature (though you could use the Zone Control Humidistat schedules), and an actuator of AirLoopHVAC 'Availability Status'. The program logic is simple: if system is off (availabilty schedule value == 0) and DP sensor is > some limit, set availability status actuator to 'CycleOn'.
