Applications Guide Tracer Graphical Programming - Trane

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Writing the mode and setpoints program
Figure 125: Offset calculation in TGP
culates the offset values and uses the occupancy mode to determine which
offsetvaluetouse.
• Use the Occupancy and De-Enumerator blocks to determine the
mode: occupied, occupied standby, or unoccupied. In this case, the
first output on the De-Enumerator block is true when the Occupancy
block yields a value of unoccupied (1). The second output on the De-
Enumerator block is true when the Occupancy block yields a value of
occupied standby (3).
• Use Network Configuration Input (nci) blocks to access the default
setpoints associated with the DAC profile.
• Use the Switch block to switch between the occupied and occupied
standby offset values.
• Use wireless connections to transfer the unoccupied status and the
final offset value to other parts of the program.
Calculating the effective cooling and heating setpoints
Use the calculated offset and the space temperature setpoint to determine
the effective occupied cooling and heating setpoints. Remember, the space
temperature setpoint is the one setpoint that the building operator uses
to adjust the space temperature. The setpoint origin could be any of the
following:
• Tracer Summit
• Comm5 network variable (through custom binding)
• Operator display
• Local wired thumbwheel setpoint
CNT-APG001-EN 137