Engineering Manual o.. - HVAC.Amickracing

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CHILLER, BOILER, AND DISTRIBUTION SYSTEM CONTROL APPLICATIONSSINGLE CENTRIFUGAL CHILLER CONTROL APPLICATIONFUNCTIONAL DESCRIPTIONTOWERCONTROL16CHILLED WATER SETPOINT45 4652MINIMUM CURRENT MAXIMUMCHILLERSYSTEMCONTROL814 13ON647572AUTO1488CHILLER 1ENABLED AUTO ON 10078 NORMALBY REMOTECONTROLS1 3OPERATINGMODESTATUS10 8PERCENT LOADMAX CURRENT1115ALARMSTATUS12549CONTROLPROGRAMM10496Fig. 9. Single Chiller Control Graphic.Item No.Function1 Indicates when chiller system is required byfan system.2 Chilled water pump ON-OFF-AUTOfunction. In AUTO pump runs when fansystems need chilled water.3 Chiller ON-OFF-AUTO function (In ON andAUTO chilled water flow required for chillerto run).4 Condenser pump status. Pump started bychiller controls when chilled water needed.5,6 Chiller leaving water temperature and setpoint.7 Icon to select chiller control dynamicsequence display (Fig. 10).8 BMCS commandable load limiting function.9-14 Operator information.15 Control program coordinates chiller control.16 Icon to select cooling tower control displays.ENGINEERING MANUAL OF AUTOMATIC CONTROL280
CHILLER, BOILER, AND DISTRIBUTION SYSTEM CONTROL APPLICATIONSCHILLED WATER SYSTEMCHILLED WATER SETPOINT4546 52MINIMUM CURRENT MAXIMUMANYTIME ANY AHU VALVE IS OPEN GREATER THAN 20 % FOR MORE THAN 3MINUTES AND THE TIME IS BEFORE 1545 THE CHILLED WATER PUMP STARTS ANDENABLES THE CHILLER SYSTEM CONTROLS.AT CHILLER START-UP, THE CHILLED WATER TEMPERATURE SETPOINT IS 46 .ANYTIME ALL AHU CHILLED WATER VALVES ARE LESS THAN 85 % OPEN, THESETPOINT INCREMENTS UP AT THE RATE OF 0.3 DEGREES EVERY 5.5MINUTES UP TO A MAXIMUM OF 52 DEGREES.ANYTIME ANY AHU CHILLED WATER VALVE IS FULL OPEN, THE CHILLED WATERTEMPERATURE SETPOINT DECREMENTS DOWN AT THE SAME RATE TO A MINIMUMOF 45 DEGREES.Fig. 10. Single Chiller Control Dynamic Sequence Display.M10495Features1. Automatic start-stop and setpoint optimization of chiller.2. User friendly monitoring and adjustment.3. Optimized unoccupied operation.4. Chiller cannot start late shortly before the unoccupiedperiod begins.Conditions For Successful Operation1. Control network, software, and programming adviseschiller controller of AHU chilled water demands.2. Interlock and control wiring coordinated with the chillermanufacturer.3. Appropriate cooling tower and control.4. For single-chiller systems without primary-secondarypumping, three-way air handling unit valves may be usedfor 80 to 85 percent of the chilled water flow (Smallvalves, up to 15 to 20 percent total flow, may be twoway,which are simpler to pipe.) If all two-way valvesare provided on single pump systems, chilled water flowor pressure controls (See DUAL CENTRIFUGALCHILLERS) are provided to maintain the required flow(varies with chiller manufacturers) through the chiller.Do not use three-way valves when diversity is used inthe chiller system design.NOTE: Little pumping energy can be saved on asingle-pump single-chiller system by usingtwo-way AHU control valves since the chillerusually requires high flow anyway.5. During the unoccupied period the 80 percent load limitingparameter (see SPECIFICATION following) is based onthe assumption that AHUs are VAV and are operatingunder a reduced maximum cfm setpoint during allunoccupied cooling modes (see the Air Handling SystemControl Applications) to save fan energy and place thechiller operation in the maximum efficiency range.6. Chilled water temperature reset from AHU chilled watervalve position requires:a. No valve always full open.b. Maximum of 30 to 40 valves. With too many valvesthe probability that one valve will always be open isvery great.c. Zone setpoint discipline is maintained. Loweringsetpoints to resolve complaints may result in one ormore valves being always open.7. Chilled water temperature reset timing increments arecompatible with valve control response. If the temperaturereset is too fast, the valve cannot adjust to the newtemperature, resulting in instability.SpecificationThe chiller system operation shall be enabled anytime thetime of day is less than 1545 and any AHU chilled water valveis open greater than twenty percent for more than three minutes.Anytime the chiller system is enabled, the chilled water pumpshall run.ENGINEERING MANUAL OF AUTOMATIC CONTROL281
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ENGINEERING MANUAL ofAUTOMATICCONTR
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Copyright 1934, 1940, 1953, 1988, 1
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PREFACEThe purpose of this manual i
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CONTROL FUNDAMENTALSElectronic Cont
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CONTROL FUNDAMENTALSDeviation—The
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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 FUNDAMENTALSTIME PROPORTION
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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 FUNDAMENTALSCONTROLLERVALVE
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CONTROL FUNDAMENTALSIn terms of hea
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CONTROL FUNDAMENTALSFLAPPERSPRINGSI
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CONTROL FUNDAMENTALSimpact of the j
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CONTROL FUNDAMENTALSCHARACTERISTICS
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PSYCHROMETRIC CHART FUNDAMENTALSWAT
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PSYCHROMETRIC CHART FUNDAMENTALShea
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PSYCHROMETRIC CHART FUNDAMENTALS19.
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PSYCHROMETRIC CHART FUNDAMENTALS0°
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PSYCHROMETRIC CHART FUNDAMENTALSREF
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PSYCHROMETRIC CHART FUNDAMENTALSThi
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PSYCHROMETRIC CHART FUNDAMENTALSCOO
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PSYCHROMETRIC CHART FUNDAMENTALS90
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PSYCHROMETRIC CHART FUNDAMENTALSFig
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PNEUMATIC CONTROL FUNDAMENTALSMain
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PNEUMATIC CONTROL FUNDAMENTALSFrom
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PNEUMATIC CONTROL FUNDAMENTALSA tem
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PNEUMATIC CONTROL FUNDAMENTALSSome
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PNEUMATIC CONTROL FUNDAMENTALSPRESS
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PNEUMATIC CONTROL FUNDAMENTALSnozzl
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PNEUMATIC CONTROL FUNDAMENTALSSENSO
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PNEUMATIC CONTROL FUNDAMENTALSFigur
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PNEUMATIC CONTROL FUNDAMENTALSBRANC
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PNEUMATIC CONTROL FUNDAMENTALSMROOM
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PNEUMATIC CONTROL FUNDAMENTALSCAPAC
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PNEUMATIC CONTROL FUNDAMENTALSHESIT
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PNEUMATIC CONTROL FUNDAMENTALSM13MD
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PNEUMATIC CONTROL FUNDAMENTALSLow-l
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PNEUMATIC CONTROL FUNDAMENTALSPNEUM
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PNEUMATIC CONTROL FUNDAMENTALSPNEUM
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PNEUMATIC CONTROL FUNDAMENTALSSUPPL
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PNEUMATIC CONTROL FUNDAMENTALSDISCH
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ELECTRIC CONTROL FUNDAMENTALSLOW-VO
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ELECTRIC CONTROL FUNDAMENTALSSERIES
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ELECTRIC CONTROL FUNDAMENTALSLOW-LI
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ELECTRIC CONTROL FUNDAMENTALSCONTRO
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ELECTRIC CONTROL FUNDAMENTALSSERIES
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ELECTRIC CONTROL FUNDAMENTALSOPERAT
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ELECTRIC CONTROL FUNDAMENTALSBRIDGE
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ELECTRIC CONTROL FUNDAMENTALSTWO-PO
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ELECTRIC CONTROL FUNDAMENTALSA 135-
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ELECTRIC CONTROL FUNDAMENTALSMOMENT
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ELECTRONIC CONTROL FUNDAMENTALSINTR
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ELECTRONIC CONTROL FUNDAMENTALSTYPI
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ELECTRONIC CONTROL FUNDAMENTALSAnot
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ELECTRONIC CONTROL FUNDAMENTALSWIRE
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ELECTRONIC CONTROL FUNDAMENTALSTemp
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ELECTRONIC CONTROL FUNDAMENTALSTYPI
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MICROPROCESSOR-BASED/DDC FUNDAMENTA
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INDOOR AIR QUALITY FUNDAMENTALSINTR
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INDOOR AIR QUALITY FUNDAMENTALSRado
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INDOOR AIR QUALITY FUNDAMENTALSTabl
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INDOOR AIR QUALITY FUNDAMENTALSHEAL
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INDOOR AIR QUALITY FUNDAMENTALSPass
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INDOOR AIR QUALITY FUNDAMENTALSThis
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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 FUNDAMENTALSINTROD
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SMOKE MANAGEMENT FUNDAMENTALSAny al
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SMOKE MANAGEMENT FUNDAMENTALSThe bu
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SMOKE MANAGEMENT FUNDAMENTALSThe do
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SMOKE MANAGEMENT FUNDAMENTALSAnothe
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SMOKE MANAGEMENT FUNDAMENTALSBIBLIO
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BUILDING MANAGEMENT SYSTEM FUNDAMEN
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AIR HANDLING SYSTEM CONTROL APPLICA
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INDIVIDUAL ROOM CONTROL APPLICATION
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VALVE SELECTION AND SIZINGVALVE SEL
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LINE PRESSURE IN PSIVALVE SELECTION
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VALVE SELECTION AND SIZINGVALVE MAT
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VALVE SELECTION AND SIZINGWhen butt
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VALVE SELECTION AND SIZING— Graph
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VALVE SELECTION AND SIZINGPRESSURE
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VALVE SELECTION AND SIZING3640.443.
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VALVE SELECTION AND SIZINGQUANTITY
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VALVE SELECTION AND SIZINGThe criti
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VALVE SELECTION AND SIZINGTable 5.
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DAMPER SELECTION AND SIZINGDAMPER S
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DAMPER SELECTION AND SIZINGIn a low
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DAMPER SELECTION AND SIZINGFor typi
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DAMPER SELECTION AND SIZINGTORQUE R
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DAMPER SELECTION AND SIZINGwhen eit
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DAMPER SELECTION AND SIZINGStabilit
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DAMPER SELECTION AND SIZINGTable 4.
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DAMPER SELECTION AND SIZINGDAMPER P
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DAMPER SELECTION AND SIZINGLOUVERSO
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GENERAL ENGINEERING DATAHEATING DAT
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GENERAL ENGINEERING DATACONVERSION
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GENERAL ENGINEERING DATAVOLUMEExist
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GENERAL ENGINEERING DATAHEAT TRANSF
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GENERAL ENGINEERING DATAFORCEEXAMPL
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GENERAL ENGINEERING DATATHREE-PHASE
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GENERAL ENGINEERING DATACONDUIT SIZ
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GENERAL ENGINEERING DATAVOLTAGE CON
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GENERAL ENGINEERING DATAAIRFLOW DAT
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GENERAL ENGINEERING DATAMOISTURE CO
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GENERAL ENGINEERING DATAENGINEERING
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GENERAL ENGINEERING DATAASHRAEGuide
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GENERAL ENGINEERING DATACooling Tow
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GENERAL ENGINEERING DATAFlame Safeg
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GENERAL ENGINEERING DATAOperationSe
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GENERAL ENGINEERING DATASeries 40Co
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GENERAL ENGINEERING DATAValve Contr
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