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How are you adding the PTHP to your model? What version of OpenStudio are you using?

In version 1.9, I can assign a PTHP to the 'Zone Equipment' column of a zone in the "Thermal Zones" tab. There are no input fields to set the air inlet and outlet nodes of the PTHP fan. I can run a simulation successfully, and the resulting IDF file has these input fields automatically set by OpenStudio.

Fan:ConstantVolume,
  PTHP CV Fan,                            !- Name
  Always On Discrete 1,                   !- Availability Schedule Name
  0.7,                                    !- Fan Total Efficiency
  250,                                    !- Pressure Rise {Pa}
  AutoSize,                               !- Maximum Flow Rate {m3/s}
  0.9,                                    !- Motor Efficiency
  1,                                      !- Motor In Airstream Fraction
  PTHP Heating Coil Outlet Node,          !- Air Inlet Node Name
  PTHP Fan Outlet Node;                   !- Air Outlet Node Name

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Adding PTHP in OpenStudio

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Editing PTHP in OpenStudio