Applications Guide Tracer Graphical Programming - Trane

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Writing the mode and setpoints program
Then use these offset values to calculate the heating and cooling effective
occupied and occupied standby setpoints.
CSP EffectiveOcc = 72.0 + 1.5 = 73.5
HSP EffectiveOcc = 72.0 – 1.5 = 70.5
CSP EffectiveOccStby = 72.0 + 5.5 = 77.5
HSP EffectiveOccStby = 72.0 – 5.5 = 66.5
Table 17 displays the effective setpoint values when the space temperature
setpoint is set to 72.0°F
Table 17: Effective setpoint values
Setpoints
Effective
setpoints
Space temperature setpoint
72.0°F
Unoccupied cooling 85.0°F 85.0°F
Occupied standby cooling 78.0°F 77.5°F
Occupied cooling 74.0°F 73.5°F
Occupied heating 71.0°F 70.5°F
Occupied standby heating 67.0°F 66.5°F
Unoccupied heating 60.0°F 60.0°F
Default setpoints
Use the module in Figure 126 on page 140 to complete the second part of
the program that calculates the effective setpoint values.
• Use the Add block to add the offset to the space temperature setpoint
to obtain the effective cooling setpoint.
• Use the Subtract block to subtract the offset from the space temperature
setpoint to obtain the effective heating setpoint.
• Use two Switch blocks to determine the effective setpoints based on
the occupancy mode. In unoccupied mode, set the effective setpoints
to the default unoccupied setpoints. Otherwise, calculate the effective
setpoints based on the effective offset and the space temperature setpoint.
• Use Network Configuration Input (nci) blocks to access the unoccupied
default setpoints associated with the DAC profile.
• Use wireless connections to transfer the effective setpoints to other
parts of the program.
CNT-APG001-EN 139