You need 3.0.0 for WaterCooled VRF to be supported natively in the SDK (Model API), as implemented by OpenStudio#3613https://github.com/NREL/OpenStudio/pull/3613

OSApp support is pending: I just added OSApp support in OpenStudioApplication#185https://github.com/NREL/OpenStudioApplication/pull/185

You need 3.0.0 for WaterCooled VRF to be supported natively in the SDK (Model API), as implemented by https://github.com/NREL/OpenStudio/pull/3613