Applications Guide Tracer Graphical Programming - Trane

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® Chapter 6 VAV AHU example Indicating manual reset alarms Complete the first module to accommodate the diagnostic conditions that require manual reset alarms (Figure 120). Because manual reset alarms require both shutdown and manual reset, use a binary variable, Manual Reset Alarm, to pass the existence of manual reset alarms to other programs. This variable is used in the fan control program to control the supply fan off. Figure 120: Manual reset alarms 130 CNT-APG001-EN
® Writing the alarms program Indicating auto-reset alarms The remaining diagnostic conditions require auto-reset alarms. Use the TGP module in Figure 121. Figure 121: Auto-reset alarms Controlling alarm indication and reset Based on the status of both auto-reset and manual reset alarms, the last module manages alarm indication and reset (Figure 122 on page 132). • Use a Latch block to indicate the alarm status. • Be sure that auto-reset alarms clear automatically, but manual reset alarms require a manual reset. • Use a Switch block to automatically return the binary variable, Alarm Reset, to a value of off (as presented in the cooling tower program in Chapter 4, “Cooling tower with two-speed fan example”). CNT-APG001-EN 131
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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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® Contents Arrangingblocks........
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® Contents Chapter 5 Cooling tower
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® Contents Chapter7 Constant-volum
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® Contents Summary-question answer
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® Figures Chapter3 Modifyingtheexh
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® Figures Figure 96: Input blocks
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® Figures Chapter 8 Constant-volum
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® Figures xx CNT-APG001-EN
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® Tables Chapter7 Constant-volumeA
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® Chapter 1 Using the Tracer Graph
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® Summary-question answers PROGRAM
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® Index dehumidification, 166-169,
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Applications Guide Tracer Graphical Programming - Trane

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