Conair MPW Guide de l'utilisateur télécharger pdf (Page 9)

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Voltageimbalanceisdeterminedusingthefollowingcalculations:

%Imbalance=(Vavg–Vx)x100/Vavg

Vavg=(V1+V2+V3)/3

Vx=phasewithgreatestdifferencefromVavg

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Forexample,ifthethreemeasuredvoltageswere198,207,and204volts,theaveragewould

be:

(198+207+204)/3=203

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Thepercentageofimbalanceisthen:

(203–198)x100/203=2.46%

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Thisexceedsthemaximumallowablevoltageimbalanceof2%.

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Theunitincludesaterminalblockformainpowerconnectiontothemainpowersource.The

mainpowersourceshouldbeconnectedtotheterminalblockthroughanappropriate

disconnectswitch.Aseparatelugforgroundingtheunitisinthemaincontrolpanel.Checkthe

electricalphasesequenceatinstallationandpriortostart‐up.Operationofthecompressor

withincorrectelectricalphasesequencingwillresultinmechanicaldamagetothecompressors.

Checkthephasingwithaphasesequencemeterpriortoapplyingpower.Thepropersequence 

shouldreadABConthemeter.IfthemeterreadsCBA,openthemainpowerdisconnectand

switchtwolineleadsonthelinepowerterminalblocks(ortheunitmounteddisconnect).All

componentsarewiredandphasedcorrectlyatthefactory.Donotinterchangeanyloadleads

thatarefromtheunitcontactorsorthemotorterminals.

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WARNING:ItisimperativethatL1‐L2‐L3areconnectedintheA‐B‐Cphasesequencetoprevent

equipmentdamageduetoreverserotation.

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CAUTION:Theunitrequiresthemainpowertoremainconnectedduringoff‐hourstoenergizethe

compressor’scrankcaseheater.Disconnectmainpoweronlywhenservicingthechiller.The

crankcaseheatershouldremainonwhenthecompressorisofftoensureliquidrefrigerantdoesnot

accumulateinthecompressorcrankcase.

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WARNING:Thecontrolpanelisconstructe

suchthatconnectingtheappropriatepowersourceto

themainterminalblockenergizestheentireelectriccircuitryofthechiller.Acontroltransformer

andpowersupplyhasbeenfactorywiredtostepdowntheincomingpowertothe115VACand

24VDCcontrolpower.Electricpoweratthemaindisconnectmustbe

shutoffbeforeopeningaccess

panelsforrepairormaintenanceinordertopreventexposuretoenergizedcomponents.Ground

theunitproperlyincompliancewithlocalandnationalcodes.

CondenserWaterLines(EP2WModelsOnly)

Theperformanceofacondenserisdependentonmaintainingtheproperflowandtemperature

ofwaterthroughtheheatexchanger.Insufficientwaterfloworhighcondenserwatersupply

temperaturewillresultinthereductionofcoolingcapacityofthechiller.Extremeconditions

willeventuallyresultinthechillershuttingdowndue

tohighrefrigerantpressure.Ifcondenser

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Conair MPW Guide de l'utilisateur Page 9

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