Applications Guide Tracer Graphical Programming - Trane

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® Chapter 7 Constant-volume AHU example Figure 158: Offset calculation Figure 159: Space temperature setpoint source determination Determine the space temperature setpoint source before calculating the effective setpoints using the resultant offset as shown in Figure 159. According to the sequence of operation, the space temperature setpoint may originate from the operator display or from a setpoint adjustment knob on a local wired thumbwheel. • Use the binary variable, Thumbwheel SP Enable, to activate the thumbwheel setpoint. • If the thumbwheel setpoint fails, use the space temperature setpoint from the operator display. • Use the Limit block to apply appropriate limits to the setpoint. • Use a wireless connection to pass the resulting space temperature setpoint to the effective setpoint calculation. Use the resultant space temperature setpoint and the calculated offset in the effective setpoint calculation (Figure 160 on page 183), as in the VAV air-handling unit. 182 CNT-APG001-EN
® Writing the mode and setpoints program Figure 160: Effective setpoint calculation Figure 161: Heat/Cool mode decision Determining the heat/cool mode Use the same module to determine the heat/cool mode as you did in the VAV air-handling unit (Figure 161). CNT-APG001-EN 183
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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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® Chapter 6 VAV AHU example Review
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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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