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**iru69** · January 8, 2011, 03:40 AM

I don't have any good answer... seems to be one more problem of Autodesk splitting up Revit into different programs. I guess have your MEP consultant fix it? But I guess you'll just have to ignore that particular warning - I don't think there's anything you can do about it.

**mdradvies** · January 8, 2011, 01:48 PM

Originally posted by safoulkes View Post

I am working in Revit Architecture with an MEP file linked in. In reviewing my warnings I came across this:

"The default system 'Default Domestic Cold Water' is now over 50 elements. To improve performance, Revit is no longer calculating the critical path pressure drop and the more complex duct sizing has been disabled. If you want to use these features, you must define logical systems in the model instead of using the default system."

An MEP colleague tells me that this warning is due to the fact that I have more than 50 plumbing fixtures on one system. I do, in fact, have many plumbing fixtures modeled into my Arch file. However, being in Revit Arch I do not believe I have the ability to change the system these fixtures are on. At least, in the properties the System Type & Name parameters are grayed out.

Does anyone know how I can fix this warning?

Is this warning a problem? Do you WANT to calculate this stuff or is it just irritating? I think if you want to do something about it you'll have to ask the MEP guy.
Never seen this though. Have you also modelled the pipings or something? Did the MEP-guy place some fixtures which you copied around a lot? never get this message but I do on occasion use a lot of fixtures...

**safoulkes** · January 10, 2011, 07:34 PM

Thanks for your inputs, I was worried I was up a creek. This warning is not causing any problems for me in this file. I had no calculations for anything running from my fixtures. All it is is that I am constantly checking my unresolved warnings and to keep my models 'clean' so it bugs me to see this warning just sitting there. And since I do not know anything about it, I don't know if it is creating any issues in the heart of my file.

In this file I placed all of the fixtures myself, and they are sinks, WCs, and drinking fountains. They do have MEP connector elements, but none are connected to any pipes. I feel silly asking this, but would it hurt to open my file in Revit MEP and try to change their default system from there?

**mdradvies** · January 10, 2011, 10:33 PM

I don't see why this should be a problem...

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