Applications Guide Tracer Graphical Programming - Trane

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® Chapter 8 Constant-volume AHU with warm-up, pre-cool, and communications Remaining unit status items Based on the programs in Chapters 6, 7, and 8, you should be able to construct programs to handle most air-handling applications. After completing this tutorial, you may want to try programming some of the common applications that you see in your area. As you develop programs for various jobs, build your own graphical programming library to reuse programs and to help you to become a more efficient programmer. 224 CNT-APG001-EN
® Summary questions Summary questions Answer the following questions to review the skills, concepts, and definitions you learned in this chapter. The answers to these questions are on page 243. 1. The SCC profile contains a variable called nviEmergOverride. This variable contains an enumerated value. It may be used to communicate an emergency shutdown to the Tracer MP580/581 controller. How would you use this variable in the fan control program to control the supply fan? 2. The SCC profile contains a variable called nviValveOverride of type SNVT_hvac_overrid. This variable contains a structure made up of three elements. The first of which is the override mode. The Tracer Summit system is capable of communicating the following values as the override mode to the Tracer MP580/581 controller: • 0 (Override Off) • 4 (Override Open) • 5 (Override Close) Incorporate logic in the discharge air control program to accommodate the valve override for both the cooling and heating valves. 3. You constructed a number of programs that incorporated alarm management and reset. In many cases, the alarm reset variable was automatically set to off after the operator turned it on to reset an alarm. How would you accomplish the same functionality from the building automation system (Tracer Summit)? Hint: A CPL program is required. CNT-APG001-EN 225
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Applications Guide Tracer Graphical
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CNT-APG001-EN ®
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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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