I have a COBie model that I am constantly working on for demonstration purposes. The model was created by the US Military. They are the ones who pioneered COBie and gave the models to Autodesk. I split the model into its constituent disciplines and now I am reworking the models to fix errors in them. Recently, I started reworking the HVAC model. The ducting was not connected or capped and so I created some systems and started connecting the ducting.

I discovered that the systems in the ducting would not necessarily change when I hook them up to the air handler. A way around this was to physically disconnect the ducting from the air handler, then change the system of the air terminals before connecting them to the air handler again.

Consider the case below.

An air terminal is selected, but it does not show up in the system browser. It is not possible to edit the network is it connected to. To fix this, disconnect the duct from the terminal.

You can now edit the system allocation of the terminal.

As soon as you reconnect the duct, the other terminals are assigned to the system.

Here you can see how the system is now behaving as normal.

In conclusion, when dealing with systems, you may need to disconnect elements from existing systems before they behave as expected. This is especially relevant to old models and systems that were modeled by someone who does not connect elements into systems, to begin with.

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