Applications Guide Tracer Graphical Programming - Trane

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Chapter 6 VAV AHU example
Figure 107: Supply fan control
Figure 108: Duct static pressure control
Controlling the duct static pressure
After starting the supply fan, modulate the supply fan speed to maintain
the duct static pressure setpoint, 1.5 in. wg (adjustable). Use a PID loop,
as shown in Figure 108.
• Use a Network Configuration Input (nci) block to access the duct
static pressure setpoint associated with the DAC profile.
➤ Using the Network Configuration Input (nci) block
Use a network configuration input (nci) in a program with this block.
Select the specific nci in the properties dialog box.
• In the duct static pressure control programming, set the PID loop
properties as shown in Figure 109 on page 117.
116 CNT-APG001-EN