Applications Guide Tracer Graphical Programming - Trane

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Writing the mode and setpoints program
Figure 124: Mode and setpoints program properties
When complete, this program will perform the following tasks:
• Effective space setpoint calculation
• Discharge air setpoint validation
• Heat/Cool mode determination
Calculating the effective space setpoints
Study the sequence of operation to determine the logic to use to construct
your program. In this case, the following logical points apply to setpoint
calculation.
• Calculate the effective occupied cooling and heating setpoints as in
other Comm5 devices.
• In occupied mode, use the default occupied cooling and heating setpoints
to determine an offset.
• In occupied standby mode, use the default occupied standby cooling
and heating setpoints to determine an offset.
• In either mode, apply the calculated offset to the space temperature
setpoint to determine the effective cooling and heating setpoints.
• Because this is a VAV air-handling unit, controlling the discharge air
temperature is not based on the effective occupied cooling and heating
setpoints but on the cooling and heating setpoints for the dis-
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