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ZoneHVAC:PackagedTerminalAirConditioner with Variable speed fan

Hi,

I want to design a system with a ZoneHVAC:PackagedTerminalAirConditioner object and control the fan speed based on the cooling demand, so for instance if the cooling demand is greater than XXX [W] operate the fan in 75% of its maximum speed, otherwise in 40%. However, based on the I/O document I can use either a FAN:ConstantVolume or a Fan:OnOff which don't allow me to control them based on the cooling demand. Is there any way to control the system in this way?