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Forums >> Revit Structure >> Technical Support >> Deleting an air termainal doesn't update CFM

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Thu, Jul 19, 2012 at 3:35:56 PM | Deleting an air termainal doesn't update CFM




Joined: Wed, Dec 19, 2007
69 Posts
5 Stars: 2 Votes

Using Revit 2012.


If I have a logical system of 4 Air Terminals and 1 VAV, connect them up physically then delete 1 of the Air Terminals and it's branch the CFM doesn't get updated. If I delete the air terminal first the system will update to 0, then when I delete the rest of the branch it'll stay 0 even though it's no longer an open system.


I know my work around has either been to diconnect and reconnect one of the branches or change the CFM on one of the terminals to give the system a nudge. However, the powers-that-be find this too inconvenient and fraught with danger, since there's a possibilty that if the flow doesn't update then our schedule will have incorrect data. The logical system updates in the system browser but the main duct and VAV aren't recalculating the flow. I've tried selecting the system and running the duct sizer to see if that would provide the nudge, but it doesn't.


So, instead of using the Flow data from our Air Terminals we're using dumb parameters to populate our schedules, which is more prone to error, IMO.


How do some of you others deal with this issue? (I know this has been fixed in 2013, we haven't rolled it out yet.)

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