Question-and-Answer Resource for the Building Energy Modeling Community
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Ok. So I was able to recreate this error.
It occurs if there is only one thermal zone to add the system to on a given building story. This can happen if you only select a few spaces types in your model, or you have few zones in your model
Specifically, in the file OsLib_HVAC.rb in the resources folder, you need to change line #1181 from this:
vrfAirConditioner.setZoneforMasterThermostatLocation(thermalZonesToAdd[1])
to this:
vrfAirConditioner.setZoneforMasterThermostatLocation(thermalZonesToAdd[0])
If there is only one zone in the array thermalZonesToAdd, then there isn't a [1] object to access. Remember that ruby arrays start at index 0.
@david-goldwasser seems to be the author and can probably fix this in the OsLib_HVAC.rblibrary.
