Engineering Manual o.. - HVAC.Amickracing

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INDIVIDUAL ROOM CONTROL APPLICATIONSINCHES OFWATER1.455PRIMARYAIR52PERCENTOPEN350 943 1150 7575MINIMUM CFMSETPOINTCURRENTCFMMAXIMUM CFMSETPOINTCURRENT SPACETEMPERATURESETPOINTCURRENT SPACETEMPERATUREADJUSTABLEMAXIMUMCFMAIRFLOWADJUSTABLEMINIMUMCFMZEROLOWHIGHSPACE COOLING LOADFig. 5. Variable Air Volume Single-Duct Air Terminal Unit.M10539Figure 5 displays the primary supply air temperature and staticpressure. These values are data points in the AHU digitalcontroller and not physical points at the VAV box. They willvary when measured at the VAV boxes. When a BMS user looksat a VAV box display, it is usually because a problem exists.The fan system supply air temperature and static pressure arenecessary data for problem analysis.Variable Air Volume ATU with Electric ReheatThe VAV ATU with electric reheat in Figure 6 adds reheat toFigure 5. Figure 6 also shows four boxes on one display. Thecooling PID varies the box cfm from maximum to minimum asthe cooling load drops to maintain setpoint. If the cooling loaddrops further, the space temperature drops through a dead banduntil the heating setpoint is reached, at which point the heatingunit is controlled to maintain the heating setpoint. When electricreheat is used, the heating PID may be modified with softwareheat anticipation to advance the heater stages off command tominimize wide swings in space temperature which would resultfrom simple temperature sensed control.Although Figures 3, 4, 5, and 6 show several inputs, outputs,and setpoints, many more parameters are available andnecessary to allow technicians to adapt the standard programto a unique room and set of equipment. These additionalparameters, usually addressable and commandable from theBMS or portable terminal, include the cooling loop PID gains,the heating loop PID gains, reheat cfm setpoint, unoccupiedspace temperature setpoint, standby temperature setpoint,temperature sensor calibration offset, bypass push-button status,bypass push-button override time in minutes, smoke purge mode% of maximum cfm setpoint, smoke pressurization mode % ofmaximum cfm setpoint, and unoccupied mode % of maximumcfm setpoint.NOTE: On-off electric heat control often requires a minimumair velocity above that of the minimum cooling cfmto prevent excessive heating element temperatures.Constant Air Volume ATUsThe constant air volume (CAV) ATUs are similar to thepressure independent VAV units, except they control at a singleair volume setpoint. They usually include reheat coils, anassociated room sensor that controls the heating, and are oftenfound connected to VAV AHUs which also have VAV boxesand the associated varying duct static pressures. CAV units areused where the room supply air volume must be maintained ata constant value.Induction VAV ATUThe induction VAV ATU (Fig. 7), uses induced return air asthe initial reheat medium. Induction VAV ATUs are usuallyinstalled above the ceiling and draw return air from the plenumcreated by a false ceiling. The controller resets the primary aircfm control setpoint in unison to opening the return air dampersper the operation cycle shown in Figure 7. As the dampers open,more return air is induced into the unit and recirculated intothe space.ENGINEERING MANUAL OF AUTOMATIC CONTROL 378
INDIVIDUAL ROOM CONTROL APPLICATIONSINCHES OFWATER1.455PRIMARYAIRWALL MODULETEMPERATURECOOLINGSETPOINTLOBBY150115098672OFFOFF7575-2.5ROOM 102350115010476OFFOFF7575-2.5ROOM 103550155050044OFFOFF7676-3.5ROOM 104350115042038OFFOFF7575-3.0SPACEMINIMUM MAXIMUMCFM SETPOINTSCURRENTCFMDAMPERPERCENTOPENHEATERSTATUSHEATINGDEADBANDHEATER #2 ONMAXIMUMCFMMAXIMUM CFMHEATER #2 OFFHEATER #1 ONHEATER #1 OFFREHEATCFMMINIMUMCFMHIGH LOWLOW HIGHSPACEHEATING LOADDEADBANDSPACECOOLING LOADZERO CFMHEATING SETPOINTCOOLING SETPOINTM10540Fig. 6. Variable Air Volume Single-Duct With Reheat Air Terminal Unit.ENGINEERING MANUAL OF AUTOMATIC CONTROL 379
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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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BUILDING AIRFLOW SYSTEM CONTROL APP
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CHILLER, BOILER, AND DISTRIBUTION S
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Page 328 and 329: CHILLER, BOILER, AND DISTRIBUTION S
Page 374 and 375: INDIVIDUAL ROOM CONTROL APPLICATION
Page 402 and 403: VALVE SELECTION AND SIZINGVALVE SEL
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Page 406 and 407: VALVE SELECTION AND SIZINGVALVE MAT
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Page 412 and 413: VALVE SELECTION AND SIZINGPRESSURE
Page 414 and 415: VALVE SELECTION AND SIZING3640.443.
Page 416 and 417: VALVE SELECTION AND SIZINGQUANTITY
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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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