Engineering Manual o.. - HVAC.Amickracing

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AIR HANDLING SYSTEM CONTROL APPLICATIONSVAV AHU WITH RETURN FAN AND FLOW TRACKING CONTROLFunctional DescriptionEA832022174ON5824.5RA309PERCENTLOAD4.53010EXHAUSTFANON5EXHAUSTFAN "ON"DIFFERENTIALm 3 /s1.27413ZEROCALIBRATION36014CONTROLPROGRAMSPACEPRESSURIZATIONDIFFERENTIALm 3 /s31120.61383211814.5NORMAL2ON1NORMAL36.42311m 3 /sOASA1690.0600.060232425002676663PERCENTLOAD1327870.450.4517ECONOMIZER DECISION.REFER TO PREVIOUSECONOMIZER OPTIONS2215CONTROLPROGRAM3229WARM-UPMODEON OFF32 1328SATEMPERATURESETPOINT1316.519OATEMPERATURE4-21OA MINIMUM SETPOINT(NOTE: THE TEST AND BALANCE INITIALVALUE FOR PROPER VENTILATION IS 22)M15182ItemNo.Function1-5 Control system energizes when supply fan isturned on (See FAN SYSTEM START-STOPCONTROL).6-8 Supply fan loads to maintain duct staticpressure at the end of the longest run.9-14 Return fan loads to track supply airflow minusexhaust airflow minus air for pressurization.15 <strong>Manual</strong> positioning value determinesminimum summer ventilation mixing damperposition. This position is fixed for the OA andrelief air dampers; but is a minimum positionfor the return air damper, the value of whichwill be overriden to maintain a constant mixingbox negative static pressure and thus a constantOA airflow.16 OA determines SA temperature setpoint.17 Economizer enables free cooling when OAis suitable.18 Mixed air temperature is for operatorinformation.258ENGINEERING MANUAL OF AUTOMATIC CONTROL
AIR HANDLING SYSTEM CONTROL APPLICATIONS19 SA temperature setpoint is reset based uponOA temperature.20-22 Mixing dampers modulate for free cooling.23,24 Mixing box static pressure maintained constantduring noneconomizer mode by modulation ofthe RA damper during minimum ventilationperiods to maintain constant OA airflow.25-27 Hot water valve, mixing dampers, and chilledwater valve modulated in sequence tomaintain SA temperature setpoint.28,29 SA temperature setpoint switches from coolingto heating value during warm-up modes.30 RA temperature determines end of warm-upmode.32 Control program coordinates return fanairflow setpoint, loading, exhaust fan control,and fan interlock.33 Control program coordinates temperaturecontrol of mixing dampers, control valves,and fan interlock.FEATURES1. The system admits outdoor air for cooling based uponthe economizer program decision.2. Supplies constant temperature variable volume (energyconserving) air to VAV boxes during cooling mode.3. Provides constant airflow of OA in summer with varyingsupply airflow.4. Return fan airflow varies with supply fan airflowdependent upon exhaust and pressurization requirements.5. Provides 100% RA during warm-up periods.6. Perimeter boxes provide heat when required.7. SA temperature setpoint is reset based upon OAtemperature.NOTE: This function has no hardware cost. The setpointparameters are easily adjusted and can be nulled bysetting the -21°C OA SA setpoint the same as the 4°COA SA setpoint.CONDITIONS FOR SUCCESSFUL OPERATION1. Skilled <strong>HVAC</strong> technicians required for pressure andvolumetric setup.2. Test and balance OA damper minimum position valueand mixing box static pressure setpoint value..3. OA and RA dampers maintained and provided withproper actuators (with positioners if pneumatic).4. Airflow elements and transducers kept clean and calibrated.SPECIFICATIONSSee FAN SYSTEM START-STOP CONTROL.Anytime the supply fan runs, the return fan shall start andthe control system shall be enabled. Also, anytime the supplyfan runs during scheduled occupancy periods, mixing dampersshall position to minimum ventilation position and the exhaustfan shall start.Anytime the economizer mode is enabled, the temperaturecontrols shall be enabled to override the AHU mixing dampersminimum ventilation setpoint for free cooling as required.During noneconomizer occupied periods the RA damper shallbe modulated to maintain a constant mixing box negative staticpressure.The supply fan loading shall be under EPID control with astart value of 20% and ramp duration of 150 seconds. The supplyfan shall load to provide design static pressure at the end of thelongest duct.The return fan loading shall be dependent upon the supplyfan airflow. When in the recirculating mode, the return fanairflow setpoint shall equal the supply fan airflow plus apositive or negative value for calibration (of flow elementsand transducers) so as to provide a neutral space staticpressure. Anytime the OA dampers are not closedcompletely, the return fan airflow setpoint shall equal thesupply fan airflow minus a value necessary to maintain aslightly positive (0.01 Pa) space static pressure. Anytimethe exhaust fan operates, the return fan airflow setpoint shallbe further reduced by additional airflow value equal to theexhaust airflow (this exhaust value shall be determined byobserving the space static pressure as the exhaust fan startsand stops).The SA temperature shall be under EPID control with a startvalue of 33 (at which point the hot and chilled water valves areclosed and the mixing damper override signal is zero) and aramp duration of 120 seconds. The hot and chilled water valvesand the mixing dampers shall be modulated in sequence tomaintain the SA temperature setpoint.Anytime the optimum start perimeter zone space temperaturesensor is less than 21°C at startup time, the SA temperaturesetpoint shall be 32°C until the RA temperature rises to 23.5°C,at which time the SA temperature setpoint shall be lowered tothe cooling SA setpoint. The SA EPID shall be invoked at theswitching of the setpoint to cooling with a start value of 33 anda ramp duration of 180 seconds. The cooling SA setpoint shallrise from 13°C to 16°C as the OA temperature drops from 4°Cto –21°C.ENGINEERING MANUAL OF AUTOMATIC CONTROL259
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FOREWORDThe Minneapolis Honeywell R
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Electronic Control Fundamentals ...
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Engineering Information ...........
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SMOKE MANAGEMENT MANAGEMENT FUNDAME
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CONTROL FUNDAMENTALSControl System
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CONTROL FUNDAMENTALSDeadband: A ran
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CONTROL FUNDAMENTALSHVAC SYSTEM CHA
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CONTROL FUNDAMENTALSInfiltration is
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CONTROL FUNDAMENTALSROTATINGGRANULA
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CONTROL FUNDAMENTALS-PATHOFIONSAIRF
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CONTROL FUNDAMENTALSOPENFINALCONTRO
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CONTROL FUNDAMENTALSBecause the hea
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CONTROL FUNDAMENTALSON“CLOSE”SW
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CONTROL FUNDAMENTALSOUTDOOR AIRTEMP
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CONTROL FUNDAMENTALSPROPORTIONAL-IN
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CONTROL FUNDAMENTALSVALVESTEAM(CONT
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CONTROL FUNDAMENTALSIn terms of hea
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CONTROL FUNDAMENTALSFLAPPERSPRINGSI
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CONTROL FUNDAMENTALSApplying the fl
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CONTROL FUNDAMENTALSCHARACTERISTICS
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PSYCHROMETRIC CHART FUNDAMENTALSPsy
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PSYCHROMETRIC CHART FUNDAMENTALSWAT
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PSYCHROMETRIC CHART FUNDAMENTALShea
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PSYCHROMETRIC CHART FUNDAMENTALS28.
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PSYCHROMETRIC CHART FUNDAMENTALS-18
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PSYCHROMETRIC CHART FUNDAMENTALSREF
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PSYCHROMETRIC CHART FUNDAMENTALSRec
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PSYCHROMETRIC CHART FUNDAMENTALSCOO
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PSYCHROMETRIC CHART FUNDAMENTALS32
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PSYCHROMETRIC CHART FUNDAMENTALS∞
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PNEUMATIC CONTROL FUNDAMENTALSPneum
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PNEUMATIC CONTROL FUNDAMENTALSINTRO
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PNEUMATIC CONTROL FUNDAMENTALSSYMBO
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PNEUMATIC CONTROL FUNDAMENTALSdiaph
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PNEUMATIC CONTROL FUNDAMENTALSContr
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PNEUMATIC CONTROL FUNDAMENTALSReset
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PNEUMATIC CONTROL FUNDAMENTALSActua
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PNEUMATIC CONTROL FUNDAMENTALSFigur
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PNEUMATIC CONTROL FUNDAMENTALSHIGH-
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PNEUMATIC CONTROL FUNDAMENTALSFigur
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PNEUMATIC CONTROL FUNDAMENTALSMMBTE
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PNEUMATIC CONTROL FUNDAMENTALS— T
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PNEUMATIC CONTROL FUNDAMENTALSCHANG
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PNEUMATIC CONTROL FUNDAMENTALSPNEUM
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PNEUMATIC CONTROL FUNDAMENTALSAny t
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PNEUMATIC CONTROL FUNDAMENTALSRETUR
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ELECTRIC CONTROL FUNDAMENTALSElectr
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ELECTRIC CONTROL FUNDAMENTALSINTROD
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ELECTRIC CONTROL FUNDAMENTALSDamper
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ELECTRIC CONTROL FUNDAMENTALSCONTRO
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ELECTRIC CONTROL FUNDAMENTALSSERIES
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ELECTRIC CONTROL FUNDAMENTALSWhen t
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ELECTRIC CONTROL FUNDAMENTALSDPDTSW
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ELECTRIC CONTROL FUNDAMENTALSOPERAT
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ELECTRONIC CONTROL FUNDAMENTALSElec
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ELECTRONIC CONTROL FUNDAMENTALSElec
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ELECTRONIC CONTROL FUNDAMENTALSSENS
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ELECTRONIC CONTROL FUNDAMENTALSTher
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ELECTRONIC CONTROL FUNDAMENTALSPOLY
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ELECTRONIC CONTROL FUNDAMENTALSELEC
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MICROPROCESSOR-BASED/DDC FUNDAMENTA
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INDOOR AIR QUALITY FUNDAMENTALSIndo
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INDOOR AIR QUALITY FUNDAMENTALSINTR
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INDOOR AIR QUALITY FUNDAMENTALSSick
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INDOOR AIR QUALITY FUNDAMENTALSTabl
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INDOOR AIR QUALITY FUNDAMENTALSHEAL
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INDOOR AIR QUALITY FUNDAMENTALSActi
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INDOOR AIR QUALITY FUNDAMENTALSVENT
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INDOOR AIR QUALITY FUNDAMENTALSEnvi
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INDOOR AIR QUALITY FUNDAMENTALSFLOW
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INDOOR AIR QUALITY FUNDAMENTALSROOF
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INDOOR AIR QUALITY FUNDAMENTALSFigu
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SMOKE MANAGEMENT FUNDAMENTALSSmoke
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SMOKE MANAGEMENT FUNDAMENTALSSmoke
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SMOKE MANAGEMENT FUNDAMENTALSDESIGN
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SMOKE MANAGEMENT FUNDAMENTALSHVACHV
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SMOKE MANAGEMENT FUNDAMENTALSALARMD
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SMOKE MANAGEMENT FUNDAMENTALS4. Sys
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BUILDING MANAGEMENT SYSTEM FUNDAMEN
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SMOKE MANAGEMENT FUNDAMENTALSCONTRO
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AIR HANDLING SYSTEM CONTROL APPLICA
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CHILLER, BOILER, AND DISTRIBUTION S
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INDIVIDUAL ROOM CONTROL APPLICATION
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SMOKE MANAGEMENT FUNDAMENTALSENGINE
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VALVE SELECTION AND SIZINGValve Sel
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VALVE SELECTION AND SIZINGQuick-ope
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VALVE SELECTION AND SIZINGBall valv
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VALVE SELECTION AND SIZINGGLOBE VAL
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VALVE SELECTION AND SIZING— Graph
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VALVE SELECTION AND SIZINGThe close
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VALVE SELECTION AND SIZINGb. The pr
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VALVE SELECTION AND SIZINGCASE A: 3
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VALVE SELECTION AND SIZINGSTEAM VAL
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DAMPER SELECTION AND SIZINGDamper S
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DAMPER SELECTION AND SIZINGINTRODUC
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DAMPER SELECTION AND SIZINGBLADEEDG
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DAMPER SELECTION AND SIZINGMULTIPLE
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DAMPER SELECTION AND SIZINGLINKAGEA
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DAMPER SELECTION AND SIZINGtwist on
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DAMPER SELECTION AND SIZINGJACKSHAF
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DAMPER SELECTION AND SIZING100CHARA
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DAMPER SELECTION AND SIZINGA damper
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DAMPER SELECTION AND SIZINGStep1 No
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GENERAL ENGINEERING DATAGeneral Eng
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GENERAL ENGINEERING DATAWEIGHT/MASS
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GENERAL ENGINEERING DATATable 8. Ce
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GENERAL ENGINEERING DATAPOWERExisti
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GENERAL ENGINEERING DATAELECTRICAL
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GENERAL ENGINEERING DATAELECTRIC MO
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GENERAL ENGINEERING DATAAIRFLOW DAT
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GENERAL ENGINEERING DATAMOISTURE CO
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GENERAL ENGINEERING DATARELATIVE HU
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INDEXINDEXENGINEERING MANUAL OF AUT
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INDEXASHRAE Psychrometric Charts 53
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INDEXFan ControlOn-Off 317Two-Speed
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INDEXFlame SafeguardControl 330Inst
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INDEXOperator interface 167Optimum
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INDEXSeries 60Actuators 103, 106Con
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INDEXValve FlowCharacteristics 376,
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NOTESINDEXENGINEERING MANUAL OF AUT
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INDEXNOTESENGINEERING MANUAL OF AUT
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INDEXNOTESENGINEERING MANUAL OF AUT
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