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Applications Guide Tracer Graphical Programming - Trane

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®<br />

Contents<br />

Chapter7 Constant-volumeAHUexample............. 145<br />

Whatyouwilllearn.........................................145<br />

Skills. . . . . . . ...........................................145<br />

Conceptsanddefinitions.................................145<br />

Block..................................................145<br />

Reviewingthesequenceofoperation..........................146<br />

Modesandsetpoints ....................................146<br />

Occupied mode (including occupied bypass) . . . . . . . . . . . . . 146<br />

Occupied standby mode . . . ...........................146<br />

Unoccupied mode (including night heat/cool). . . . . . . . . . . . . 147<br />

Spacesetpoints .....................................147<br />

Dischargeairsetpoints ...............................147<br />

Heat/Coolarbitration.................................147<br />

Control................................................148<br />

Supply fan. . . . . . . . . . . . . . . ...........................148<br />

Outdoor air damper . . . . . . . ...........................148<br />

Exhaustfan.........................................148<br />

Coolingvalve .......................................148<br />

Heatingvalve .......................................149<br />

Humidification ......................................149<br />

Dehumidification ....................................149<br />

Alarms.............................................149<br />

Determiningaprogrammingapproach.........................154<br />

Writingthefancontrolprogram ..............................155<br />

Controlling the supply fan . . . . . ...........................155<br />

Controllingtheexhaustfan...............................156<br />

Writingthemixedaircontrolprogram.........................158<br />

Writingthedischargeaircontrolprogram......................164<br />

Calculatingthedischargeairsetpoint.......................165<br />

Implementing humidification and dehumidification . . . . . . . . . . . 166<br />

Controllingthecoolingvalve ..........................169<br />

Controllingtheheatingvalve ..........................171<br />

Controllingthehumidifier.............................172<br />

Writingthealarmsprogram..................................176<br />

Writingthemodeandsetpointsprogram.......................180<br />

Implementing effective space setpoint calculation . . . . . . . . . . . . 181<br />

Determiningtheheat/coolmode...........................183<br />

Addingnightheat/cool...................................184<br />

Summaryquestions........................................187<br />

x<br />

CNT-APG001-EN

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