Applications Guide Tracer Graphical Programming - Trane

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® Contents Chapter 5 Cooling tower with variable-speed fan example 79 Whatyouwilllearn..........................................79 Skills. . . . . . . ............................................79 Conceptsanddefinitions..................................79 Blocks..................................................79 Reviewingthesequenceofoperation...........................80 Condenser water pump . . . . . . . ............................80 Coolingtowerfan........................................80 Sumpheater............................................80 Alarms.................................................80 Calculations.............................................80 RefreshingtheTGPeditor ....................................84 Determiningaprogrammingapproach..........................84 Editingtheprogramproperties................................84 Modifying the alarms module . . . . . ............................85 Writing the calculations module . . . ............................86 Calculating change in water temperature across the cooling tower . 86 Calculatingtheambientwet-bulbtemperature................87 Calculatingtheapproachtemperature.......................87 Writing the cooling tower fan module. . . . . . . . . . . . ...............88 Startingandstoppingthefan ..............................88 Imposinglimits..........................................89 ImplementingPIDcontrol .................................91 SettingupthePIDblockproperties.......................91 IncorporatingthePIDblock.............................93 Writing the condenser water pump module . . . . . . . ...............94 Adding the input blocks . . . . . . . ............................95 Addingtheoutputblocks..................................95 Determiningwhentostartandstopthepump ................96 AddingaFeedbackAlarmblock .........................96 Checking conditions to start and stop the pump . . . . . . . . . . . . 98 Summaryquestions........................................104 Chapter 6 VAV AHU example . . ...................... 105 Whatyouwilllearn.........................................105 Skills. . . . . . . ...........................................105 Conceptsanddefinitions.................................105 Blocks.................................................105 viii CNT-APG001-EN
® Contents Reviewingthesequenceofoperation.......................... 106 Modesandsetpoints.................................... 106 Occupiedmode..................................... 106 Unoccupiedmode................................... 106 Spacesetpoints..................................... 106 Dischargeairsetpoints............................... 107 Heat/Coolarbitration................................. 107 Control................................................ 107 Supply fan . . . . . . . . . ................................ 107 Outdoor air damper. . ................................ 107 Exhaustfan......................................... 108 Coolingvalve....................................... 108 Heatingvalve....................................... 108 Alarms ............................................ 108 Determiningaprogrammingapproach .........................113 Writingthefancontrolprogram...............................114 Controlling the supply fan. ................................114 Controllingtheductstaticpressure.........................116 Controllingtheexhaustfan................................117 Writingthedischargeaircontrolprogram.......................119 Controlling the mixed air and outdoor air damper . . . . . . ...... 120 Determining whether to economize. . ................... 121 Determining the outdoor air damper position . . . . . . ...... 122 Controllingthecoolingvalve ............................. 123 Controllingtheheatingvalve............................. 124 Writingthealarmsprogram ................................. 128 Indicatingmanualresetalarms............................ 130 Indicatingauto-resetalarms.............................. 131 Controllingalarmindicationandreset...................... 131 Writingthemodeandsetpointsprogram ...................... 134 Calculatingtheeffectivespacesetpoints.................... 135 Calculatingtheoffsetvalues........................... 136 Calculating the effective cooling and heating setpoints. . . . . 137 Effectivesetpointcalculationexamples ................. 138 Validatingthedischargeairsetpoints ...................... 140 Determiningtheheat/coolmode .......................... 141 Viewingprogramstatus..................................... 143 Summaryquestions........................................ 144 CNT-APG001-EN ix
Page 1: Applications Guide Tracer Graphical
Page 4 and 5: CNT-APG001-EN ®
Page 6 and 7: ® Special notifications and format
Page 8 and 9: ® Contents Arrangingblocks........
Page 12 and 13: ® Contents Chapter7 Constant-volum
Page 14 and 15: ® Contents Summary-question answer
Page 16 and 17: ® Figures Chapter3 Modifyingtheexh
Page 18 and 19: ® Figures Figure 96: Input blocks
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Page 24 and 25: ® Tables Chapter7 Constant-volumeA
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® Chapter 3 Modifying the exhaust
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® Chapter 6 VAV AHU example Table
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® Chapter 6 VAV AHU example Alarm
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® Chapter 6 VAV AHU example charge
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® Chapter 6 VAV AHU example Effect
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® Chapter 6 VAV AHU example Summar
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® Programming best practices Set t
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® Programming best practices 234 C
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® Summary-question answers Figure
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® Summary-question answers closed
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® Summary-question answers PROGRAM
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® Index dehumidification, 166-169,
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Trane An American Standard Company
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Applications Guide Tracer Graphical Programming - Trane

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