Creating a Schematic Diagram
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
on page 520 mode.
Adding Schematic Lines in Orthographic Mode
, you add schematic lines in the world coordinate system
(WCS). In the WCS, the X axis is horizontal, the Y axis is vertical, and the Z axis is perpendicular to the XY
plane.
You can use the
to guide your placement of lines. You can also use the AutoCAD
®
Ortho mode to
restrict the cursor movement to the horizontal or vertical axes. The orthogonal alignment depends on the
current grid and snap settings. You can turn these tools on or off at any time.
To add schematic lines in orthographic mode
1
, start the add command by doing one of the following:
■
Open a schematic tool palette, and select a schematic line tool.
If necessary, scroll to display the tool. Because tools contain pre-configured properties for
the objects they create, you might not need or be able to specify some of the schematic line
properties referenced in this procedure.
■
Click Home tab
➤
Build panel
➤
Schematic Line
.
■
Enter
slineadd
.
Creating a Schematic Diagram | 525
Summary of Contents for 235B1-05A761-1301 - AutoCAD MEP 2010
Page 1: ...AutoCAD MEP 2010 User s Guide March 2009 ...
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Page 242: ...Modifying the elevation of a duct 224 Chapter 6 Drawing HVAC Systems ...
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