Applications Guide Tracer Graphical Programming - Trane
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Applications Guide Tracer Graphical Programming - Trane

Applications Guide Tracer Graphical Programming - Trane Applications Guide Tracer Graphical Programming - Trane

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28.09.2014 Views

® Chapter 8 Constant-volume AHU with warm-up, pre-cool, and communications Figure 165: Modified constant-volume AHU wiring diagram 198 CNT-APG001-EN

® 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

®<br />

Chapter 8 Constant-volume AHU with warm-up, pre-cool, and communications<br />

Figure 165: Modified constant-volume AHU wiring diagram<br />

198 CNT-APG001-EN

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