You create a schematic diagram by connecting symbols with lines to show the basic function of a building system in the overall design. You drag and drop schematic symbols into a drawing and connect the symbols with schematic lines, drawing the schematic lines just as you draw lines in AutoCAD®. However, schematic lines and symbols are more powerful than AutoCAD lines and objects because they recognize the connection points built into each schematic symbol, enabling you to create an intelligent building system diagram.
Typically, you alternate between drawing schematic symbols and drawing schematic lines, essentially drafting them together. You can add freestanding or end-of-line symbols in a drawing and connect them later. For example, you can add a pump and connect the supply and return lines at a later time, or you can add a fan and connect the wire at a later time. You can also draft the lines first and then add in-line symbols. For example, you might add a duct heater that breaks into a run in a hot air system, or add a device after wire has been run to a panel.
You can draw a schematic diagram in orthographic (plan) or isometric mode.