Conair MPW Guia do Utilizador descarregar pdf (Página 52)

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HumanMachineInterface(HMI)

Thehumanmachineinterface(HMI)providesauserinterfacewiththePLC,whichcontrolsthe

operationofthechiller.TheHMIallowsdataentryforchillersetup,acceptscommandsto

operatechiller,anddisplayschillerstatus.

PressureReliefValve

Apressurereliefvalveisinstalledonallpressurevesselstosafelyrelievepressureduetofireor

otherabnormaloperatingconditions.EP2Wchillershaveapressurereliefvalveinstalledonthe

water‐cooledcondenser,EP2Achillershaveoneontheliquidline,andEP2Rchillershaveone

installedonthereceiver.Replacethisvalveifitopens.

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Note:VentrefrigerantreliefvalvesinaccordancetoANSI/ASHRAEStandard15,SafetyCodeforMechanical

Refrigeration.

Receiver

ThereceiverisstandardonEP2RunitsandoptionalonEP2AandEP2Wunits.Itisprimarilya

liquidstoragetanktoholdliquidrefrigerantwhennotincirculation.Sinceanair‐cooled

condenserlocatedoutdoorsprovidestherefrigerationcyclecooling,therefrigerantchargewill

varyfromwintertosummeroperation.Duringthesummermonths,thereceiverholdsthe

excessrefrigerantchargerequiredinthewinter.Thereceiveralsoaidsinholdingthe

refrigerantchargewhileinpumpdown.

RefrigerantFilter/Drier

Thefilter/drierislocatedintheliquidlineafterthecondenser.Itremovesanymoistureand/or

foreignmatterthatmayhavegottenintotherefrigerantstream.Moistureandforeignmatter

cancauseseriousdamagetothecomponentsofarefrigerationsystem.Forthisreason,itis

importantthatthechillerbeequippedwithacleanfilter/drier.Replacethefilter/driercoreif

anyofthefollowingconditionsoccur.

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• Openingtherefrigerationsystemtotheatmosphereforrepairsormaintenance

• Indicationofmoistureinthesightglass

• Anexcessivepressuredropdevelopsacrossthefilter/drier(Asignificanttemperature

differencebetweenthefilterinletandoutletindicatesthis.)

RefrigerantServiceValve

Amanualtwo‐wayballvalveisprovidedintherefrigerantliquidlinejustdownstreamofthe

condenserorreceiver.

RefrigerantSightGlass

Therefrigerantsightglassislocatedontheliquidline.Itallowstheoperatororservice

techniciantoobservetheflowofliquidrefrigerantinthecircuit.Prolongedperiodsoffoaming

inthesightglassmayindicatealowrefrigerantconditionorarestrictionintheliquidline.

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Conair MPW Guia do Utilizador Página 52