Engineering Manual o.. - HVAC.Amickracing

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INDOOR AIR QUALITY FUNDAMENTALSROOFTOP UNIT CONTROL SYSTEMFigure 6 shows a typical packaged rooftop VAV systemsimilar to the pervious system but with humidification andwithout a return fan. Differential pressure mixed air control iswell suited to roof top applications which usually do not havesufficient ductwork for flow station outdoor air measurement.Without the return fan and with a two position exhaust fan itis difficult to ensure air balance in the building.EXHAUST FANEARARATEMPERATUREEXHAUSTFANSTATUSSUPPLY FANOASACTOATEMPER-ATURERETURNAND RELIEFDAMPEROADAMPERSTATICPRESSUREMA HEATINGTEMPER- STAGEATURECOOLINGVALVESAFANHUMIDIFIERVALVESA FANSTATUSFig. 6. Typical Rooftop <strong>HVAC</strong> System.SARELATIVEHUMIDITYSATEMPER-ATURESAPRESSUREROOMTEMPER-ATUREAFTERHOURSM10488OPERATOR INTERFACEModern Building Management Systems (BMS) utilizingdistributed direct digital controllers and personnel computerbased local area networks are installed in many buildings. Fullutilization of a BMS greatly simplifies the operations andmaintenance tasks and provides prompt alert of IAQ problems.By furnishing quality of information knowledgeable operatorsand engineers can easily visualize the system, comprehend thecurrent status, and determine the nature of any problem.Operator graphic displays with meaningful real-timedynamic data displays can enable building operators tounderstand how the building is operating. CO2, VOC, cfm,DP, SP, filter, and drain pan alarms can all provide operatorinformation required to maintain IAQ. Further, trend loggingand dynamic displays can allow the designer and operatorto analyze the building performance historically or in realtime.And a real-time predictive maintenance program withstatus inputs such as filter and drain pan alarms can be usedto prevent degradation of air quality.Dynamic graphical operator interfaces providing intuitive“snapshot” system displays, three dimensional multipointdynamic and historical plots, and live video displays of criticalsystems are available for a BMS and can be employed in IAQapplication. When these functions are specified, the operator’svalue is greatly enhanced by a better understanding of the <strong>HVAC</strong>system operation and by real time feedback to adjustments thatare made.ENGINEERING MANUAL OF AUTOMATIC CONTROL156
INDOOR AIR QUALITY FUNDAMENTALSFor additional information on system configuration, networkcommunications, and specifying graphics, refer to the BuildingManagement System Fundamentals section.GRAPHIC DISPLAYSFigure 7 provides a sample of an operator graphic showingthe functional software relationships that control the system.Actual values for the temperatures, air flows, and valve anddamper positions and percent fan loads are all shown for theoperator. In addition, the control and logic functions that controlthe system are shown. The rectangle in the lower right corneris a set of selection buttons which allow the operator to look atadditional data. Clicking on one of the buttons produces anoperator display similar to Figure 8.SPACETEMPERATURE7458 84PROPELLEREXHAUSTFANEA8383HEAT COOLNIGHT CYCLESETPOINTS17RETURN FANPERCENTLOAD56585876NORMALON9606RAINOUT SPPIDCFMSUPPLY FANEXHAUSTFAN OFF09610SETPOINT2—1SUBTRACT1-2EXHAUSTDIFFERENTIALCFMSELECTOREXHAUSTFAN ON2700EXHAUSTDIFFERENTIALCFMPRESSURIZATION2700 DIFFERENTIALCFM2— 13001SUBTRACT1-213610 CFM74OASA22OUTSIDE AIRMINIMUMSIGNALONUNOCCUPIED OVERRIDEONSTATUS60DURATIONMINUTES000063PERCENTLOAD90SETPOINT55OFF 55STATUSWARM-UP MODENORMALSETPOINTDISCHARGEAIR RESETGRAPHIC1.8RELATEDGRAPHICSSEQUENCE OFOPERATIONECONOMIZERCONTROLVENTILATIONCONTROLFLOORPLANM10489Fig. 7. Sample Minimum Operator Graphic Display.ENGINEERING MANUAL OF AUTOMATIC CONTROL157
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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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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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