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I saw no one had answered you so I thought this might help. I am not 100% sure about in OpenStudio but if you put it into EnergyPlus you could possibly use the setpointManager:OutdoorAirReset or SetpointManager:FollowOutdoorAirTemperature (I have only used this with the cooling tower so I am not sure it would work with the chiller but it is probably worth a try). As EnergyPlus is the engine for OpenStudio this might appear where you add setpoints to your system. Otherwise you could pull your model out of OpenStudio and run it in EnergyPlus adding this setpoint to your chiller. I am not sure either are perfect but they might help.