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A bug report.

I tried modelling optimum start control to zone VRF.

I used an ExampleFile: VariableRefrigerantFlow_5Zone.idf (V25-2-0).

Originally, AvailabilityManager:NightCycle is modelled in one of ZoneHVAC:TerminalUnit:VariableRefrigerantFlow objects: TU1 in the idf file. I replaced it with AvailabilityManager:OptimumStart. Then, EnergyPlus crashed with few clue in the err file.

The idf file is here.

Some findings:

• Crashed with other versions e.g., V25-1-0, V23-1-0, V9-4-0 and V8-9-0.
• Crashed regardless of Control Type of AvailabilityManager:OptimumStart
• Simulated successfully for ZoneHVAC:FourPipeFanCoil with another idf file. The crash seems to be specific to ZoneHVAC:TerminalUnit:VariableRefrigerantFlow.

This post is about optimum start for VRF. I wonder if @apdavis or @Julien Marrec has successfully modelled optimum start for zone VRF.