Applications Guide Tracer Graphical Programming - Trane

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® Chapter 8 Constant-volume AHU with warm-up, pre-cool, and communications Controlling the heating valve Controlling the humidifier Writing the alarms program The sequence of operation did not change with respect to alarm management; therefore, no changes are required to the Alarms program. See “Writing the alarms program” on page 176 for more information. 212 CNT-APG001-EN
® Writing the mode and setpoints program Figure 175: Space temperature setpoint source determination Writing the mode and setpoints program The mode and setpoints program in Chapter 7 provides a solid base for the program required by the more complex air handler in this chapter. The following considerations require additions or changes to the program: • Consider a third source of the space temperature setpoint—the building automation system. • Implement the pre-cool and warm-up mode decisions. Modifying the effective setpoint calculation The first module in the program, which calculates the setpoint offset, is unaffected by the modifications. See “Implementing effective space setpoint calculation” on page 181 for more information. Use additional programming in the space temperature setpoint source determination to include a setpoint from the building automation system. According to the sequence of operation: The space temperature setpoint source may be the building automation system, the operator display, or a wired thumbwheel setpoint adjustment knob, with the building automation system setpoint given first consideration. Use the nviSetpoint network variable input block, associated with the SCC profile, to communicate the building automation setpoint. If a valid setpoint is communicated, apply limits to it and accept the result as the space temperature setpoint. Use a Fail block to switch to the operator display setpoint or the wired setpoint if the communicated setpoint becomes invalid (Figure 175). The remaining portions of the program regarding effective setpoint calculations are the same as those in Chapter 7. CNT-APG001-EN 213
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Applications Guide Tracer Graphical
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CNT-APG001-EN ®
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® Special notifications and format
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Page 276: Trane An American Standard Company
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Applications Guide Tracer Graphical Programming - Trane

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