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You cannot just replace Fan:ConstantVolume with Fan:OnOff on an AirLoopHVAC, otherwise you get the error message you see.
Fan:OnOff must be used as part of a compound object, meaning it needs to be used in a AirLoopHVAC:Unitary:Furnace:HeatCool, ZoneHVAC:PackagedTerminalAirConditioner, etc.
That said, if you are using EnergyPlus 8.1 or higher you can use AirLoopHVAC:UnitarySystem. This will allow you to embed a Fan:OnOff on an AirLoopHVAC.
You cannot can not just replace Fan:ConstantVolume with Fan:OnOff on an AirLoopHVAC, AirAirLoopHVAC, otherwise you get the error message you see.
Fan:OnOff must be used as part of a compound object, meaning it needs to be used in a AirLoopHVAC:Unitary:Furnace:HeatCool, ZoneHVAC:PackagedTerminalAirConditioner, etc.
That said, if you are using EnergyPlus 8.1 or higher you can use AirLoopHVAC:UnitarySystem. This will allow you to embed a Fan:OnOff on an AirLoopHVAC.