Applications Guide Tracer Graphical Programming - Trane

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Writing the mode and setpoints program
Figure 157: Mode and setpoints program properties
When complete, this program will perform the following tasks:
• Setpoint source determination
• Effective space setpoint calculation
• Heat/Cool mode determination, including night heat/cool
Implementing effective space setpoint calculation
The effective space setpoint calculation for the constant-volume air-handling
unit is exactly the same as that used for the VAV air-handling unit.
First, determine the setpoint based on the occupancy mode and the
default setpoints as shown in Figure 158 on page 182.
One important distinction exists between the setpoint calculation module
here and the one you used for the VAV air-handling unit. Instead of using
default setpoints associated with the DAC profile, use the default setpoints
associated with the SCC profile.
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