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NewMechanicalSystem Method

Document New Mechanical System Method

Creates a new MEP mechanical system element.

Namespace: Autodesk.Revit.Creation
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)
Syntax 
public MechanicalSystem NewMechanicalSystem(
	Connector baseEquipmentConnector,
	ConnectorSet connectors,
	DuctSystemType ductSystemType
)

Parameters

baseEquipmentConnector Connector
One connector within base equipment which is used to connect with the system. The base equipment is optional for the system, so this argument may be . The baseEquipmentConnector should not be included in the connectors.
connectors ConnectorSet
Connectors that will connect to the system. The owner elements of these connectors will be added into system as its elements.
ductSystemType DuctSystemType
The system type.

Return Value

MechanicalSystem
If creation was successful then an instance of mechanical system is returned, otherwise an exception with information will be thrown.
Exceptions
Exception Condition
InvalidOperationException Thrown when calling this function outside of the Autodesk Revit MEP product.
ArgumentNullException Thrown when the input connectors parameter value is .
ArgumentOutOfRangeException Thrown when the ductSystemType parameter is out of permitted scope.
ArgumentException Thrown when some connectors can't be used to create the mechanical system. All the input connectors and base equipment connector should match system type and domain with the system, and they should not have been used in another system. The owner of BaseConnector should be a mechanical equipment, and the owner of other connectors should be a mechanical equipment or air terminal.
InvalidOperationException Thrown when the mechanical system creation failed.
Remarks
This method will regenerate the document even in manual regeneration mode.
Example 
// create a connector set for new mechanical system
ConnectorSet connectorSet = new ConnectorSet();
// Base equipment connector
Connector baseConnector = null;

// Select a Parallel Fan Powered VAV and some Supply Diffusers
// prior to running this example
ConnectorSetIterator csi = null;
ICollection<ElementId> selectedIds = uiDocument.Selection.GetElementIds();
Document document = uiDocument.Document;
foreach (ElementId id in selectedIds)
{
    Element e = document.GetElement(id);
    if (e is FamilyInstance)
    {
        FamilyInstance fi = e as FamilyInstance;
        Family family = fi.Symbol.Family;
        // Assume the selected Mechanical Equipment is the base equipment for new system
        if (family.FamilyCategory.Name == "Mechanical Equipment")
        {
            //Find the "Out" and "SupplyAir" connector on the base equipment
            if (null != fi.MEPModel)
            {
                csi = fi.MEPModel.ConnectorManager.Connectors.ForwardIterator();
                while (csi.MoveNext())
                {
                    Connector conn = csi.Current as Connector;
                    if (conn.Direction == FlowDirectionType.Out && conn.DuctSystemType == DuctSystemType.SupplyAir)
                    {
                        baseConnector = conn;
                        break;
                    }
                }
            }
        }
        else if (family.FamilyCategory.Name == "Air Terminals")
        {
            // add selected Air Terminals to connector set for new mechanical system
            csi = fi.MEPModel.ConnectorManager.Connectors.ForwardIterator();
            csi.MoveNext();
            connectorSet.Insert(csi.Current as Connector);
        }
    }
}

MechanicalSystem mechanicalSys = null;
if (null != baseConnector && connectorSet.Size > 0)
{
    // create a new SupplyAir mechanical system
    mechanicalSys = uiDocument.Document.Create.NewMechanicalSystem(baseConnector, connectorSet, DuctSystemType.SupplyAir);
}
See Also