Question-and-Answer Resource for the Building Energy Modeling Community
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The VRF terminal units are constructed in the OsLib_HVAC.createVRFAirConditioners method in the OsLib_HVAC library.
When the ZoneHVACTerminalUnitVariableRefrigerantFlow object is created, it creates a default FanOnOff object and assigns it to the VRF terminal unit.
To change the pressure rise, once the object is constructed, you can get the supply fan and set the pressure rise.
Add this code block right after the vrf_terminalUnit = OpenStudio::Model::ZoneHVACTerminalUnitVariableRefrigerantFlow.new(model) constructor.
supply_fan = vrf_terminalUnit.supplyAirFan
supply_fan = supply_fan.to_FanOnOff.get
supply_fan.setPressureRise(125)
Related forum question on pressure rise for VRF units..
You may also want to use different VRF curves from the OS default.
