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Trane TRG-TRC014-EN manual The Trane Company, An American Standard Company

Models: TRG-TRC014-EN

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The Trane Company

Worldwide Applied Systems Group 3600 Pammel Creek Road

La Crosse, WI 54601-7599 www.trane.com

An American Standard Company

Literature Order Number	TRG-TRC014-EN (May 2001)
File Number	E/AV-FND-TRG-TRC014-0501-EN

Supersedes	TRG-TRC004-EN (May 1999)

Stocking Location	La Crosse

Since The Trane Company has a policy of continuous product improvement, it reserves the right to change design and specifications without notice.

Page 93

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Trane TRG-TRC014-EN manual The Trane Company, An American Standard Company

Contents

Air Conditioning Clinic VAV Systems One of the Systems SeriesTRG-TRC014-EN VAV Systems A publication of The Trane CompanyOne of the Systems Series Preface VAV SystemsA Trane Air Conditioning Clinic period one What Is Variable Air Volume? Contentsperiod two Components of a VAV SystemTRG-TRC014-EN What Is Variable Air Volume? What Is Variable Air Volume?Constant-Volume Variable-TemperatureSystem period oneConstant Volume-FullLoad period oneWhat Is Variable Air Volume? Constant Volume-PartLoad What Is Variable Air Volume?period one What Is Variable Air Volume? Constant Volume-MultipleSpacesConstant Volume-MultipleSpaces period oneTerminal Reheat System What Is Variable Air Volume?period one VAV-FullLoad Variable-Air-VolumeVAV SystemWhat Is Variable Air Volume? period oneVAV-PartLoad Why VAV? Energy SavingsWhat Is Variable Air Volume? Why VAV?What Is Variable Air Volume? Why VAV? Comfortperiod one quiteSystem Comparison What Is Variable Air Volume?period one Variable Thermal Load Profiles VAV Building CharacteristicsWhat Is Variable Air Volume? period oneCommon Return Air Path Independent Space ControlWhat Is Variable Air Volume? period oneComponents of a VAV System period twoComponents of a VAV System period twoperiod two VAV Terminal UnitsComponents of a VAV System Components of a VAV System Single Duct, Cooling Onlyperiod two Single Duct, Cooling OnlySpace Heating with a VAV System Components of a VAV Systemperiod two primary air VAV ReheatComponents of a VAV System period twoComponents of a VAV System Fan-PoweredTerminal Unitsperiod two parallelplenum air Parallel, Fan-PoweredParallel, Fan-Powered Components of a VAV SystemSeries, Fan-Powered Components of a VAV Systemperiod two Series, Fan-Powered Parallel Versus Series Fan-PoweredComponents of a VAV System period twoSingle-DuctVAV Systems Components of a VAV Systemperiod two Components of a VAV System Dual-Ductperiod two warm primary air cool primary air supply airwarm Variable Air Volume to the Spacecool Components of a VAV SystemSingle-Fan, Dual-DuctVAV System Constant Air Volume to the SpaceComponents of a VAV System period twoTwo-Fan, Dual-DuctVAV System Components of a VAV Systemperiod two Upstream Pressure Affects Airflow VAV Terminal Unit ControlsComponents of a VAV System period twoPressure-IndependentControl Pressure-DependentControlComponents of a VAV System period twoTerminal-UnitControl Technologies Primary Airflow MeasurementComponents of a VAV System period twoPneumatic Control Components of a VAV Systemperiod two Electronic Control Components of a VAV Systemperiod two Direct Digital Control DDC Components of a VAV Systemperiod two period two Components of a VAV SystemDirect Digital Control DDC Electronic pressure transducer provides pressure-independentcontrolComponents of a VAV System Diffusersperiod two DiffusersComponents of a VAV System Linear Slot Diffuserperiod two CoandaCeiling-DiffuserCompatibility Components of a VAV Systemperiod two period two Components of a VAV SystemCeiling-DiffuserCompatibility cross TComponents of a VAV System Supply Duct Systemperiod two Supply Duct SystemComponents of a VAV System Duct Designperiod two Equal friction methodDuct Design Recommendations Components of a VAV Systemperiod two System Configurations System Configurationsperiod three period threePerimeter Spaces period threeSystem Configurations Perimeter SpacesSystem Configurations Baseboard Perimeter Heatingperiod three heat loss 450 Btu/hr/ftOverhead Supply Perimeter Heating System Configurationsperiod three period three System ConfigurationsVAV Reheat heat loss 250 Btu/hr/ftDual-DuctVAV Fan-PoweredVAVSystem Configurations period threeInterior Spaces, Reheat Required Interior SpacesSystem Configurations period threeChangeover/Bypass VAV System Small BuildingsSystem Configurations period threeSystem Configurations System-LevelControl Modesperiod three System-LevelControl ModesOccupied Mode System Configurationsperiod three Unoccupied Mode System Configurationsperiod three Morning Warm-up/Cool-downMode System Configurationsperiod three Fan Modulation period fourFan Modulation period fourperiod four System Resistance CurveFan Modulation Riding the Fan Curve Operating PointFan Modulation period fourForward-CurvedCentrifugal Fan Fan Modulationperiod four Fan Modulation Fan Modulation Curveperiod four Fan Modulation CurveVAV Fan Modulation Fan Control LoopFan Modulation period fourDischarge Dampers Fan Modulation MethodsFan Modulation period fourperiod four Fan ModulationDischarge Dampers As the VAV terminal units modulate shut, the system resistance curve shifts upwards. The fan begins to “ride up” the constant-speedperformance curve, from the design operating point A, trying to reach the balance point with this new system resistance curve. As a result, the fan delivers a lower airflow at a higher static pressureFan Modulation Inlet Vanesperiod four Inlet VanesFan Modulation Fan-SpeedControlperiod four Fan-SpeedControlFan Modulation Variable-PitchBlade Controlperiod four Variable-PitchBlade ControlFan Modulation Comparisons Fan Modulationperiod four Fan Outlet Static-PressureControl Controlling System Static PressureFan Modulation period fourFan Modulation Supply Duct Static-PressureControlperiod four sensor located 2/3 down supply ductFan Modulation Optimized Static-PressureControlperiod four sensor locatedPart-LoadComparison Fan Modulationperiod four Application Considerations period fiveperiod five Application Considerationsperiod five System-LevelVentilationApplication Considerations Application Considerations Ventilation Resetperiod five outdoor airflowMeasures to Prevent Coil Freeze-Up Freeze Protection for CoilsApplication Considerations period fiveApplication Considerations Part-LoadSpace Humidity Controlperiod five Part-LoadSpace Humidity ControlPart-LoadSupply Air Tempering Application Considerationsperiod five Direct Pressurization Control Building Pressure ControlApplication Considerations period fiveApplication Considerations period fiveA sensitive static-pressurecontroller directly compares the variations between the space static pressure and the outdoor reference static pressure. The controller modulates the capacity of a central relief fan to maintain a fixed static-pressuredifference, usually a slightly positive building pressure. The space static-pressuresensor is typically located in the lobby or near the main entrance Review period sixReview period sixReview-PeriodTwo period sixfan-poweredVAV terminal unit ReviewReview-PeriodFour Review-PeriodThreeReview period sixReview Review-PeriodFiveperiod six System-levelventilationReview period sixTRG-TRC014-EN Questions for Period QuizQuestions for Period Questions for Period11What method of static-pressurecontrol provides the greatest power- savings potential for a VAV system? QuizQuestions for Period TRG-TRC014-EN Answers Glossary Glossary parallel fan-poweredterminal unit A fan-poweredVAV terminal unitsupply air Conditioned air delivered to a space GlossaryAn American Standard Company The Trane Company