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How to implement centralized ventilation system without heating or cooling in energyplus idf editor?

Hi all, For our master thesis project i want to implement a centralized ventilation system to a school building with different zones, which is seperate from the existing heating system (baseboard heating).

We tried it with the "HVACTemplate:System:UnitarySystem" object (without heating and cooling coils) and an "HVACTemplate:Zone:Unitary" object for each zone with the first object assigned as the Template Unitary System.

Since there is already a I"HVACTemplate:Zone:BaseboardHeat" object used for heating in all existing zones, we get following severe error for each zone (e.g. the music class) and the simulation does not work:

* Severe * Duplicate name found. name: "Music class (100) Equipment". Overwriting existing object.

We are thankful for any suggestions regarding this problem. Kindly find attached our file and thanks in advance!