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By default the EnergyPlus Input Data Dictionary only includes 20 'Zone Terminal Unit Name' fields for ZoneTerminalUnitList, which defines the terminal units connected to a single VRF condenser object. \

You can edit the EnergyPlus.idd file located in the EnergyPlus installation packaged with OpenStudio (located at C:\Program Files\OpenStudio 1.10.0\share\openstudio\EnergyPlusV8-4-0 to add name fields to ZoneTerminalUnitList, making sure to move the semicolon to the last field:

A21,    \field Zone Terminal Unit Name 20
        \type object-list
        \object-list ZoneTerminalUnitNames
A22,   \field Zone Terminal Unit Name 21
        \type object-list
        \object-list ZoneTerminalUnitNames
...
A31;  \field Zone Terminal Unit Name 30
        \type object-list
        \object-list ZoneTerminalUnitNames

If you're using a separate installation of EnergyPlus to run your idf, edit the idd for that installation.

By default the EnergyPlus Input Data Dictionary only includes 20 'Zone Terminal Unit Name' fields for ZoneTerminalUnitList, which defines the terminal units connected to a single VRF condenser object. \object.

You can edit the EnergyPlus.idd file located in the EnergyPlus installation packaged with OpenStudio (located at C:\Program Files\OpenStudio 1.10.0\share\openstudio\EnergyPlusV8-4-0 to add name fields to ZoneTerminalUnitList, making sure to move the semicolon to the last field:

A21,    \field Zone Terminal Unit Name 20
        \type object-list
        \object-list ZoneTerminalUnitNames
A22,   \field Zone Terminal Unit Name 21
        \type object-list
        \object-list ZoneTerminalUnitNames
...
A31;  \field Zone Terminal Unit Name 30
        \type object-list
        \object-list ZoneTerminalUnitNames

If you're using a separate installation of EnergyPlus to run your idf, edit the idd for that installation.

By default the EnergyPlus Input Data Dictionary only includes 20 'Zone Terminal Unit Name' fields for ZoneTerminalUnitList, which defines the terminal units connected to a single VRF condenser object.

You can edit the EnergyPlus.idd file located in the EnergyPlus installation packaged with OpenStudio (located at C:\Program Files\OpenStudio 1.10.0\share\openstudio\EnergyPlusV8-4-0 a text editor to add name fields to ZoneTerminalUnitList, making sure to move the semicolon to the last field:

A21,    \field Zone Terminal Unit Name 20
        \type object-list
        \object-list ZoneTerminalUnitNames
A22,   \field Zone Terminal Unit Name 21
        \type object-list
        \object-list ZoneTerminalUnitNames
...
A31;  \field Zone Terminal Unit Name 30
        \type object-list
        \object-list ZoneTerminalUnitNames

The idd used for the EnergyPlus installation that runs from OpenStudio is located at C:\Program Files\OpenStudio 1.10.0\share\openstudio\EnergyPlusV8-4-0. If you're using a separate installation of EnergyPlus to run your idf, edit the idd for that installation.