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Forums >> Revit Systems >> Technical Support >> HVAC Systems
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Joined: Mon, Oct 20, 2008
22 Posts
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Hi everybody I have a little problem with HVAC systems: I created 4 VAV systems, and main system, connected to A/C unit. After connecting VAV unit to the main, all VAV boxes show in System type: Mech. Supply system #, Main Supply system 1. And I can'n run duct check, it shows error: "At least one connector on the highlighted element is currently assigned to the Supply System 1. In general items shouldn't be assigned to the Default Systems, but should be assigned as equipments or elements of a non-default system" In addition, all main ducts show Air Flow as 0 (all VAV's shows the right Air Flow). Can somebody help me? Thank you
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Joined: Thu, Aug 21, 2008
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Did you find a solution to your problem? I am having similar issues. When I try to size the ducts I get an error in the segment from the vav to the ahu that says the flow is zero. How did you fix the problem?
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Joined: Wed, Jun 11, 2008
68 Posts
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Caveman- there are several things that could cause your flow to = zero in a duct. 1- did you make the connector on your diffuser & your AHU's flow = "system airflow parameter"? (screen shot attached- you click on the little grey box next to the flow value to get a dialog box to pop up) 2- did you make the flow on the diffuser "preset" (user specified), and the flow on the equipment calculated? at least one connector has to be calculated in order to calculate flow. 3- are the connector flow directions corresponding correctly?
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Joined: Wed, Jun 11, 2008
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Attachment was too large. I had to reduce it down to just the dialog boxes, but this reflects the low pressure side connector on a vav box.
Edited on: Wed, Sep 16, 2009 at 7:09:31 AM
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