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[EnergyPlus_Support] Problems with nodes


I am having trouble connecting the output of a pump to the input of a boiler.  I get the error message that says it can't find a matching output node.  

I have tried putting the pump and the boiler on the same branch (pump first) and using a common name for the node the connects them.  I have tried putting them on separate branches, giving them distinct node names and letting the supply-side branch list connect them.  I have tried using variable and constant speed pumps.  Nothing has worked.  Any ideas?  How does Energy+ decide whether an input and output node are matching.

In a possibly unrelated note, many of my nodes have 0 references elsewhere (which doesn't seem to be an issue) and the fluid-type is BLANK, which is a little more worrisome.  I don't see a way to SET the fluid type.  Is this an issue?

Any help you can offer will be appreciated.  Thanks.



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