User guide

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Corporate Office: 724.584.5500  Instant Access 24/7 (Parts and Service): 800.458.1960  Parts and Service: 814.437.6861
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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
d
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