Issue with VRF and ERV/DOAS air loop

asked 2021-11-18 14:44:50 -0600

bwebster gravatar image

updated 2021-11-19 08:26:02 -0600

Hello,

I am repeatedly getting a cycle of errors related to a multifamily OSM model with a VRF + DOAS (w/ERV) system. I thought the error may have had something to do with opening the model in a new version of Open Studio (3.2.0), so I rebuilt the air loop and the VRF system.

When I rebuilt the air loop, I get severe errors with the VRF system saying that the air inlet and outlet nodes are not the same for the VRF terminal units -- I do not know how to adjust the VRF terminal nodes through the Open Studio interface (I imagine you can do it through the IDF). So I rebuilt the VRF system thinking it may have been a version issue, but then I get a series of severe errors with the air loop:

* Severe * Node NODE 127 connects to no component * ~~~ * Occurs in Supply Air Path=CENTRAL ERV NODE 119 SUPPLY PATH * ~~~ * Check the connection to a ZoneHVAC:EquipmentConnections object * ~~~ * Check if this component is missing from the Supply Air Path

When I rebuild the air loop, I then get the same VRF terminal errors, and thus I'm stuck in a time consuming cycle. Any help would be much appreciated!

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