Learn how to resolve an issue where flow and pressure drop is not calculating for a hydronic pipe network.
Symptom: A piping network appears to be connected properly, but the flow and pressure drop isn't calculated.
Issue: The Flow Configuration for the VAV units have both pipe connectors set to Calculated.
Solution: Change one of these to Preset to allow the calculations to run as expected.
In the drawing area, select one of the VAV units, and open in Family Editor. Change the Flow Configuration for both connectors from Calculated to Preset. Reload the family.