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How do I fix CBECC-Com error code 9?

asked 2015-05-28 07:38:36 -0500

updated 2015-05-28 08:56:45 -0500

An example of the error I get is as follows:

2015-May-28 08:01:54 - Error: Undefined data: right side of '*' evaluating rule: Set DEFAULT ThrmlZn:CondFlrAreaWithMult (55:'ThermalZone-General.rule' line 744)

I was able to find ThermalZone-General.rule and figured out that the right side of "*" is the variable u. See below for example:


Originally, I included HVACZnCnt values of either 2 or 3 for 17 of the thermal zones and the corresponding ZnSysCnt for the associated zone systems. So once I got this error, I set the HVACZnCnt and ZnSysCnt values to default and increased the system parameters to the appropriate values to represent all of the zone systems within the thermal zone. However, I still get the same error.

UPDATE: After trying to figure this out it seems that there might be an issue associated with more than one space being assigned to a thermal zone. Does anyone know if each thermal zone is only allowed to have one space associated with it?

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When I created a copy of the model with just one floor, I no longer get these errors and am still able to have more than one space assigned to a thermal zone. Still not sure what is causing the problem in the version of the file with all of the floors.

anchapin's avatar anchapin  ( 2015-05-28 09:58:22 -0500 )edit

@anchapin, can you confirm what CBECC-Com version you are using?

DavidReddy's avatar DavidReddy  ( 2015-05-28 11:02:38 -0500 )edit

Also, I will need a copy of you model. Please attach here or on the GC issue you posted a comment to. Thanks

DavidReddy's avatar DavidReddy  ( 2015-05-28 11:05:42 -0500 )edit

I'm using version 2013-3b (717) and I attached the files on the GC issue. Is there a way to attach files here?

anchapin's avatar anchapin  ( 2015-05-28 11:20:06 -0500 )edit

I thought there was a way to attach files, but it appears you can only embed links. Ive got the file and will post a response shortly to both locations.

DavidReddy's avatar DavidReddy  ( 2015-05-28 14:40:49 -0500 )edit

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answered 2015-05-28 14:57:09 -0500

The error you are seeing is occuring prior to evaluation of CHECK rules, to be specific, it is in the DEFAULT rules that are evaluated each time the project is opened (actually 3x during file open to ensure properties dependent on each other are fully defined) and each time a property in the model is changed.

In any case, the root cause in your case is there are two ThermalZones, "Zn FC-3-0.2" and "Zn FC-4-0.3", which are included in the model but are not referenced by any Spaces. If you delete these zones (and the systems defined to serve them), this error will go away.

This issue does warrant a rule update to mitigate this error from being logged until running the analysis, so I appreciate you bringing it to our attention. In the future, 'Undefined data' errors are best handled through the CBECC-Com website:

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answered 2015-05-28 11:15:08 -0500

I was able to get the errors to stop showing by deleting just one floor out of five. Not sure what caused the issue and why it now seems to be solved. Any comments would be appreciated if it can help me avoid this in the future.

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Asked: 2015-05-28 07:38:36 -0500

Seen: 567 times

Last updated: May 28 '15