Indicates if the system is well connected or not. 
   Namespace:   Autodesk.Revit.DB.Mechanical  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2011 
Syntax
Remarks
 If the system is not well connected, parameters which need to be calculated are invalid.