Applications Guide Tracer Graphical Programming - Trane

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Determining a programming approach
Determining a programming approach
The programs created in Chapter 7 serve as the starting point for all of
the programs in this chapter. Modify the programs to apply the new
warm-up and pre-cool modes and write a new program to incorporate
some of the communications functions with the Tracer Summit building
automation system.
From the sequence of operation, determine the basic control functions
required. The required control functions are very similar to those in the
Chapter 7, “Constant-volume AHU example.” In this case, the following
control functions must be addressed.
• Effective space setpoint calculation
• Mode determination, including night heat/cool, pre-cool, and warm-up
• Supply fan control
• Exhaust fan control
• Mixed air/outdoor air damper control
• Discharge air setpoint calculation
• Cooling valve control, including dehumidification
• Heating valve control, including dehumidification
• Humidification
• Alarm management
• Communications
Not every control function fits into one program. Determine the number
of programs required by grouping control functions that require the same
information and/or the same run frequency as shown in Table 28.
Table 28: Control functions within each program
Program name
FanControl
MixedAirControl
DischargeAirControl
Alarms
ModeAndSetpoints
Communications
Control functions
Supply fan control
Exhaust fan control
Mixed air/outdoor air damper control
Discharge air setpoint calculation
Cooling valve control
Heating valve control
Dehumidification
Humidification
Alarm management
Effective space setpoint calculation
Setpoint source determination
Mode determination
Communications to BAS
CNT-APG001-EN 199