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Munters TEN-DSC-E1708 Owner's manual

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Originalinstructions
Operatingmanual
DesiCool™
AirTreatmentSystem
TEN-DSC-E1708©MuntersEuropeAB2017
Tableofcontents
Tableofcontents...........................ii
1Introduction.................................1
1.1Denition...............................
1
1.2Aboutthismanual.....................
1
1.3Warnings...............................
1
1.4Warranty...............................
1
1.5Inspectionofdelivery..................
2
1.6Technicaldata.........................
2
2Safety.........................................3
2.1Intendeduse...........................
3
2.2Safeinstallation,operationand
maintenance...........................
3
2.2.1Electricalhazard...............
4
2.2.2Physicalhazard................
5
2.2.3Propertyhazard................
6
2.3Residualrisks..........................
7
2.4Warningsigns.........................
8
2.5Emergencystop.......................
8
3Systemdesignandfunction..............9
3.1Mainfunction..........................
9
3.2Systemdesign.........................
9
3.3Basicsensorslayout..................
11
3.4Pre-andpost-treatment..............
12
4Maincomponentsdescription............13
4.1Desiccantrotor........................
13
4.1.1Function........................
13
4.1.2Rotormaintenance............
14
4.1.3Rotorseals,drivebeltanddrive
motor...........................
14
4.2Thermalrecoveryrotor................
15
4.2.1Function........................
15
4.2.2Rotor............................
15
4.2.3Rotorseals,drivebeltanddrive
motor...........................
15
4.3Watercoils.............................
16
4.3.1Coolingcoils....................
16
4.3.2Heatingcoils...................
16
4.3.3Frostprotection................
16
4.3.4Dropletseparator..............
16
4.3.5Cleaning........................
17
4.3.6Stoppingwaterowtothe
coils.............................
17
4.4Evaporativecoolers/humidiers.....
18
4.5Fans....................................
20
4.5.1Fantypes.......................
20
4.5.2Maintenance...................
20
4.6Filters...................................
20
4.6.1Filtertypes......................
20
4.6.2Filtermaintenance.............
21
4.6.3Panellters.....................
21
4.6.4Baglters.......................
21
4.7Dampers...............................
22
4.8Flexibleconnections..................
23
5Commissioning............................24
5.1Checksbeforestartingup.............
24
5.2Inspectionofevaporativecoolers....
24
5.3Startingup.............................
25
6Serviceandmaintenance.................26
6.1Safety..................................
26
6.2General................................
28
6.3Serviceoptions........................
28
6.4Extendedwarranty....................
28
6.5Serviceandmaintenanceschedule..
29
7Scrapping....................................31
8Supplements................................32
9ContactMunters............................33
iiTableofcontentsTEN-DSC-E1708
DesiCool
1Introduction
1.1Denition
TheAirTreatmentSystemdescribedinthismanualishereafterreferredtoasthe“unit”.
1.2Aboutthismanual
Thisinstructionmanualcontainsimportantsafetyinformation,aproductdescriptionandmaintenance
instructionsforthedeliveredairtreatmentunit.Readallrelevantpartsofthismanualbeforeoperatingor
performinganyworkontheunit.Observanceofthisinformationwillhelpyoutoavoiddanger,tominimise
repaircostanddowntime,andtoincreasethereliabilityandtheservicelifeoftheairtreatmentunit.
Thismanualshouldbestoredinapermanentlocationclosetotheunit.
Thismanualdoesnotdescribeinfullallthemaintenanceworkrequiredtoguaranteethelongevityand
reliabilityofthistypeofequipment.AlwayscontactMuntersforserviceandrepairs,toensuresafeandlong
lastingoperationoftheunit.
Thecontentsofthismanualcanbechangedwithoutpriornotice.
NOTE!Thismanualcontainsinformationwhichisprotectedbycopyrightlaws.Itisnotallowedtoreproduceor
transmitanypartofthismanualwithoutwrittenconsentfromMunters.
Pleasesendanycommentsregardingthismanualto:
MuntersEuropeAB
TechnicalDocumentation
P.O.Box1150
SE-16426KISTASweden
email:[email protected]
1.3Warnings
Informationaboutdangersareinthismanualindicatedbythecommonhazardsymbol:
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ARNING!
Indicatesapossibledangerthatcanleadtopersonalinjury.
CA CA
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UTION! UTION!
UTION!
Indicatesapossibledangerthatcanleadtodamagetotheunitorotherproperty,orcauseenvironmentaldamage.
NOTE!Highlightssupplementaryinformationforoptimaluseoftheunit.
1.4Warranty
ThewarrantyisbasedonthetermsofsaleanddeliveryofMunters.Thewarrantyisnotvalidifrepairsor
modicationsarecarriedoutwithoutthewrittenagreementofMunters,oriftheunitdoesnotoperateunder
theconditionsagreedwithMunters.Damagesresultingfromnegligence,poormaintenanceorfailureto
complywiththerecommendationswillnotbecoveredbythewarranty.
TEN-DSC-E1708Introduction1
DesiCool
Itisaconditionofthewarrantythattheunitforthefullwarrantyperiodisservicedandmaintainedbya
qualiedMuntersengineerorMuntersapprovedengineer.Accesstospecicandcalibratedtestequipment
isnecessary.Theserviceandmaintenancemustbedocumentedforthewarrantytobevalid.
Thewarrantyislimitedtoafreeexchangeofpartsorcomponentswhichhavefailedasaresultofdefects
inmaterialsorworkmanship.
Commissioning/Start-upinspection"S"byMuntersismandatorytovalidatethefullwarranty.
AlwayscontactMuntersforserviceorrepair.Operatingfaultscanoccuriftheunitismaintained
insufcientlyorincorrectly.
1.5Inspectionofdelivery
Uponreceipt,inspecttheequipmentbeforesigningthedeliverynote.Specifyanydamageonthedelivery
noteandsendaregisteredletterofcomplainttothelastcompanyresponsiblefortransportingthe
equipmentwithinthreedays.InformMuntersofthiscomplaint.
Theunitmustbefullyinspectedwithinoneweekfromarrival.Ifahiddenfaultisdiscovered,senda
registeredletterofcomplainttothehaulierwithintheweekfollowingdelivery,andnotifyMuntersofthis.
1.6Technicaldata
ThetechnicaldataforaspecicunitcanbefoundintheseparateDatasheetissuedforeachunit.
2IntroductionTEN-DSC-E1708
DesiCool
2Safety
2.1Intendeduse
TheunitdeliveredbyMuntersmustonlybeusedforthetreatmentofair.Thisincludesltering,heating,
cooling,humidifying,dehumidifyingandtransportingair.Muntersexplicitlyrulesoutanyotheruse.
Theunitisdesignedtomeetthesafetyrequirements,directivesandstandardslistedintheECDeclarationof
Conformity.
NomodicationoftheunitisallowedwithoutpriorapprovalbyMunters.Attachmentorinstallationof
additionaldevicesisonlyallowedafterwrittenagreementbyMunters.
TheconditionsofoperationspeciedintheseparateDatasheetmustbeobservedabsolutely.Anyotheruse
oftheequipmentcancausepersonalinjuryanddamagetotheunitandotherproperty.
2.2Safeinstallation,operationandmaintenance
Greatefforthasbeenplacedonthedesignandmanufactureoftheunit,tocomplywithapplicablesafety
aspectsforthistypeofequipment.
Theinformationinthismanualincludessuggestionsforbestworkingpracticeandshallinnowaytake
precedenceoverindividualresponsibilitiesorlocalregulations.
Duringoperationandotherworkwithamachineitisalwaystheresponsibilityoftheindividualtoconsider:
■Thesafetyofallpersonsconcerned.
■Thesafetyoftheunitandotherproperty.
■Theprotectionoftheenvironment.
Alwayscarryoutriskassessmentsbeforedoinganyworkontheunit.
TEN-DSC-E1708Safety3
DesiCool
2.2.1Electricalhazard
Figure2.1ElectricalhazardFigure2.2Secureagainstreconnection
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Installation,adjustments,maintenanceandrepairsmustonlybecarriedoutbyqualiedpersonnelwhoare
awareoftherisksinvolvedwhenworkingwithequipmentoperatingwithhighelectricalvoltageandhighmachine
temperatures.
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ARNING!
Donotopendistributionboxesorotherelectricalconnectionboxes.Theunitisconnectedtohighvoltagewhich
cancauseseriousinjuryordeath.
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Beforedoinganyserviceormaintenanceworkontheunitmakesurethatallelectricalequipmentisdisconnected
fromthepowersupply,andsecuredagainstreconnection.
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Theunitmustneverbeconnectedtoavoltageorfrequencyotherthanthatforwhichitwasdesigned.Refertothe
unitidenticationplate.
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Anyexternalelectricalequipment,forexampleaportablelamp,mustbeconnectedtoanearthfaultbreaker.
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Commissioningandinitialstart-upoftheunitmustbecarriedoutbyauthorizedpersonnelonly.
4SafetyTEN-DSC-E1708
DesiCool
2.2.2Physicalhazard
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Rotatinghazard.Theunitcontainsrotatingfansandothermovingparts.
Topreventpersonalinjury,theunitmustberunwithallpaneldoorsclosedandallremovablepanelsandprotective
gridsproperlyinplace.Neveropenthedoorsorpanelsbeforeallfansandothermovingpartshavecometoa
completestop,andthemainpowerisswitchedoff.
Fansandothermovingpartscanstartautomaticallyandwithoutwarning.
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Theunitsectionsareheavy.Useonlyapprovedliftingequipmentadaptedtotheweightofthesectionstoavoid
accidents.
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Makesurethatallpipecouplingsareproperlytightenedbeforethemediumsupplyforcoolingorheatingcoils
isturnedon.
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Cleaningagents,coolingmedia,oilandgreasearesubstancesthataredangeroustopersonalhealthandtothe
environment.Theymustnotbeallowedtodrainawayintothesoilorthepublicsewersystem.Thedisposalofsuch
substancesmustbeeffectedinaccordancewithlocalandnationallawandregulations.
TEN-DSC-E1708Safety5
DesiCool
2.2.3Propertyhazard
CA CA
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UTION! UTION!
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Theunitisnotintendedforuseinclassiedareas,norfortreatingairpollutedwithsolvents,dustorother
aggressive,corrosiveorabrasiveparticles.
CA CA
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UTION! UTION!
UTION!
Failuretocorrectlyadjusttheairowscancausemalfunctionoftheunit.
Anydamagetotheunitresultingfromincorrectadjustmentoftheairowscaninvalidatethewarrantyoftheunit.
Theunitmustnotberunformorethanafewminutesbeforesettingupthecorrectairows.
CA CA
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Serviceandmaintenanceworkshouldonlybecarriedoutbyqualiedandtrainedpersonnel.Operatingfaultscan
occuriftheunitismaintainedinsufcientlyorincorrectly.
CA CA
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Neverclimbontheunitoruseitasscaffolding.
6SafetyTEN-DSC-E1708
DesiCool
2.3Residualrisks
Inordertoavoidthepossibledangersinoperatingormaintainingtheunit,necessaryprotectionshavebeen
foreseen.However,therearestillsomeresidualrisksthatallpersonnelworkingwiththeunitmustbeaware
of:
Thehandlingofuidsinrefrigerating,heatingorcoolingcircuitscanbedangerous.Studytheinformation
relevantforeachtypeofuidtoavoiddangers.
Hotorcoldsurfacescancauseinjuries.Beforeintervening,waituntiltemperaturesbecomenormaloruse
protectiveclothing.
Whenworkinginsidetheunit,payattentiontothepossibleergonomicdangersfrominadequatework
positionsorheavylifts.
Unitsectionscanbehigh.Usesecurescaffoldingtoaccesstheupperlevel.
Unitpanelscanbeheavy.Donothandlealone.
Sharpsteeledgesonboxesorcoilscancausecuts.Useprotectivegloves,particularlyduringdisassembly
orassembly.
Whenworkingwithornearfans,beawarethatremainingairowthroughtheunitcancausespontaneous
rotationofthefansandtherebycausingpersonalinjury.
Doorsforoverpressurecompartmentscanbeequippedwithadditionalsafetylocksagainstaccidental
opening.Ensurethatsuchlocksareclosedbeforestartingtheunit.
Thereand/orsmokedetectionisnotasafetyfunctioninrelationtotheENISO13849-1.
Whenworkingwithltersorinadustyarea:Toprotecttheuserfromdust,wearasuitableCEmarkedface
maskselectedandttedinaccordancewiththeapplicablesafetystandards.
Usehearingprotectionaccordingtoapplicablesafetystandardswhenworkinginanoisyenvironmentto
avoidhearingimpairment.
Dampersopenandcloseautomatically.Keephandsclearofthedamperswhentheyaremoving.
TEN-DSC-E1708Safety7
DesiCool
2.4Warningsigns
Thefollowingwarningsignscanbepresentontheunit,towarntheusersofresidualriskswhichcancause
seriousinjuryordeath.Makesurethatallpersonnelworkingwithorneartheunitareawareofthemeaning
ofeachsign.
Figure2.3Riskofelectrical
shock.
Figure2.4Hotairowor
surface.
Figure2.5Unitstarts
automatically.
Figure2.6Pinchhazard.
2.5Emergencystop
Theunitcaninanemergencybestoppedusingthemainpowerswitch.
CA CA
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UTION! UTION!
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Onlyusethemainpowerswitchtostoptheunitinthecaseofanemergency.Thenormalshutdownsequencewill
notbefollowed.Thefansstopandtheheatercanbeveryhot,whichcanresultindamagetotheheaterandother
componentsclosetoit.
8SafetyTEN-DSC-E1708
DesiCool
3Systemdesignandfunction
3.1Mainfunction
TheDesiCool™airtreatmentsystemisahighlyefcientenergyrecoveryventilationsystem.Ituseslow
costorsurplusheattocreateamorecomfortableindoorclimate.
TheDesiCoolcombinesMuntersadvanceddesiccantdehumidicationtechnologywithevaporative
cooling.
Insummertheunitkeepstherelativehumidityintheroomlowerthanasetsummermaximumvalue,and
alsocontrolsthesupplytemperaturetothesetvalue.
Inwintertheunitkeepsthesupplytemperatureatthesetvaluebyrecoveringheatfromtheexhaustair,while
atthesametimecontrollingtheroomhumiditynottobelowerthanaminimumsetvalue.
3.2Systemdesign
Figure3.1DesiCoolsystemdesignexample*
1Supplydamper6Thermalrecoveryrotor11Bypassdamper
2Supplylter7Heatingandcoolingcoils12Reactivationheater
3Desiccantrotor8Evaporativecooler13Exhaustfan
4Bypassdamper9Exhaustlter14Exhaustdamper
5Processfan10Evaporativecooler
*Individualsystemsarebuilttospecication,andcanbedifferentfromthisexample.
ThereareseveralpossibleoperationmodesfortheDesiCoolsystem.Dependingontheoutside
temperatureandhumidity,andonthesupplysetpoints,thecontrollerwillactivatethecomponentsas
needed.
TEN-DSC-E1708Systemdesignandfunction9
DesiCool
Insummertimetheunitproducescoolanddehumidiedairbyadesiccantcoolingprocess.Theambientair
isdehumidiedinthedesiccantrotor.Thisprocessincreasestheairtemperature.Inthethermalrecovery
rotortheairisindirectlycooledbytheevaporativecoolerintheexhaust.Finally,theairisfurthercooled
directlybytheevaporativecoolerinthesupply.
Thereisaheaterintheexhaustairstreamforreactivationofthedesiccantrotor.Seethemoredetailed
descriptioninsection4.1,Desiccantrotor.
Inwintertimetheunitproduceswarmair.Thethermalrecoveryrotorstartstorotateandrecoversheat
fromtheexhaustairstream.Ifmoreheatrecoveryisrequiredthedesiccantrotoralsostartstorotateand
recoversbothheatandmoisture.Atextremeambientwinterconditionsthehotwatercoilinthesupplyis
alsoinoperation.
Throughtheuseofbypassdampersitispossibletooptimizethewaytheairistreated.
10SystemdesignandfunctionTEN-DSC-E1708
DesiCool
3.3Basicsensorslayout
Figure3.2DesiCoolbasicsensorslayoutexample
1.DifferentialpressureswitchonlterPSW16.DifferentialpressureswitchonlterPSW2
2.InputtemperatureandRHsensorTHS17.ReactivationtemperaturesensorTS11
3.FlowcontroldifferentialpressuresensorDP48.AntifreezethermostatTS9
4.AntifreezethermostatTS109.FlowcontroldifferentialpressuresensorDP3
5.SupplytemperaturesensorTS2
DH.Dehumidicationrotor
TH.Thermalrecoveryrotor
TEN-DSC-E1708Systemdesignandfunction11
DesiCool
3.4Pre-andpost-treatment
Pre-andpost-treatmentoftheprocessaircanbeperformedbythefollowingfunctionalcomponents:
■Inletdamperstoenableisolationoftheunitfromtheairow.Thedampersareinstalledontheoutside
oftheunit.
■Heatingcoil:Thecoilcanbeelectricorusehotwaterorsteamasheatingmedium.Thecoilmustthen
beconnectedtoanexternalheatingmediumsupply.Itispossibletoactivateapumpfromthecontrol
system.
■Coolingcoil:Thecoiluseschilledwater,possiblymixedwithglycol.Thecoilmustbeconnectedtoan
externalmediumsupply.Thecontrolsystemregulatesanactuatortomaintaindewpointandorcooling
setpoint.Itispossibletoactivateapumpand/orachillerfromthecontrolsystem.
■Filtersforvariousairqualityspecications.Filterscanbeequippedwithpressuredropsensorstoenable
"blockedlter"alarm(option).
CA CA
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Coilsmustbefrostprotectedwhenthereisariskoffrost.Seesection4.3.3,Frostprotection.
12SystemdesignandfunctionTEN-DSC-E1708
DesiCool
4Maincomponentsdescription
NOTE!Somecomponentsareoptional,andindividualsystemspecicationsmaydiffer.
Allcomponentpicturesareexamples,andmaynotcorrespondtoindividualunits.
4.1Desiccantrotor
4.1.1Function
Figure4.1Rotorprinciple
1.Processair
2.Dryair
3.Reactivationair
4.Wetair
Therotoristheadsorptiondehumidifyingcomponentintheunit.Therotorstructureiscomprisedofa
largenumberofsmallairchannels.
Thedesiccantrotorismadeofacompositematerialthatishighlyeffectiveinattractingandretainingwater
vapour.Therotorisdividedintwozones.Theairowtobedehumidied,processair,passesthroughthe
largestzoneoftherotorandthenleavestherotorasdryair.Sincetherotorrotatesslowly,theincomingair
alwaysmeetsadryzoneontherotor,thuscreatingacontinuousdehumidicationprocess.
Theairowthatisusedtodrytherotor,reactivationair,isheated.Thereactivationairpassesthrough
therotorintheoppositedirectiontotheprocessairandleavestherotoraswetair(warm,moistair).This
principleenablesthedehumidiertoworkeffectively,evenatfreezingtemperatures.
Therotorismonitoredbyarotationsensortoenableanalarmiftherotorstopsunintentionally.
TEN-DSC-E1708Maincomponentsdescription13
DesiCool
4.1.2Rotormaintenance
Therotorsurfacemustbeinspectedregularly.Performpressuredropmeasurementstofollowrotoraging.
Thedesiccantrotorwillnotbereplacedpreventively,capacitymonitoringwillindicatewhenrotor
replacementisnecessary.
4.1.3Rotorseals,drivebeltanddrivemotor
Therotordrivemotor,drivebeltandsealsshouldbereplacedifnecessary,oratthemaximumintervals
accordingtothemaintenanceschedule.
Belttensioncanbeadjustedbyshorteningthebelt.
Rotorsealsmustbecheckedandadjustedonceperyear.
14MaincomponentsdescriptionTEN-DSC-E1708
DesiCool
4.2Thermalrecoveryrotor
4.2.1Function
Figure4.2Thermalrecoveryrotor
Thethermalrotoris,dependingontheambientconditions,usedeitherforcoolingorforheatingofthe
supplyair.Thisisdonebyexchangingheatbetweenthesupplyairstreampassingthroughthelowerhalfof
therotor,andtheexhaustairstreampassingthroughthetophalfintheoppositedirectionwhiletherotor
rotates.
Thethermalrotorismanufacturedfromaluminiumwithmanysmallchannelsthroughwhichtheairpasses,
makingalargecontactsurfacetotransfertheheat.
Therotorisdrivenbyanelectricmotorandadrivebeltaroundthecircumferenceoftherotor.
4.2.2Rotor
Therotorsurfacemustbeinspectedregularly.
Iftherotorisdirtyitcanbecleanedwithavacuumcleaner,orwithlowpressurecompressedairifnecessary.
4.2.3Rotorseals,drivebeltanddrivemotor
Thedrivebeltmustbecheckedaftertherst100hoursofoperation.
Therotordrivemotor,drivebeltandsealsshouldbereplacedifnecessary,oratthemaximumintervals
accordingtothemaintenanceschedule.
Belttensioncanbeadjustedbyshorteningthebelt.
Theclearancebetweentherotorsurfaceandthesealsmustbecheckedduringinspection.Adjustthesealsif
necessary.
TEN-DSC-E1708Maincomponentsdescription15
DesiCool
4.3Watercoils
4.3.1Coolingcoils
Coolingcanbesuppliedbyoptionalcoldwatercoilsinstalledinthepre-andorpost-treatmentsections.
Thecoiluseschilledwater,possiblymixedwithglycol,ascoolingmedium.Thecoilmustbeconnected
toanexternalmediumsupply.
CA CA
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Hotandcoldwatersupplylinesmustonlybedesignedandexecutedbyqualiedpersonneltakingintoaccount
therespectiverelevantlocalregulations.
Whenthereisariskoffrost,thewatercoilsmustbefrostprotected.Seesection4.3.3,Frostprotection.
4.3.2Heatingcoils
Heatingcanbesuppliedbyoptionalhotwatercoilsinstalledinthepre-andorpost-treatmentsection.
Thecoiluseshotwaterorsteamasheatingmedium.Thecoilmustbeconnectedtoanexternalheating
mediumsupply.
CA CA
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Hotandcoldwatersupplylinesmustonlybedesignedandexecutedbyqualiedpersonneltakingintoaccount
therespectiverelevantlocalregulations.
Whenthereisariskoffrost,thewatercoilsmustbefrostprotected.Seesection4.3.3,Frostprotection.
4.3.3Frostprotection
Ifthewaterinacoilfreezesthiscouldcauseseriousdamage.Afrozencoilmustalmostalwaysbereplaced.
Theguaranteeisnolongervalidevenifthecracksarenotvisible.
Ifthereisariskoffrost,thecoolingmediummustbeenrichedwithglycolorananti-freezeheatercomplete
withanti-freezethermostatmustbeinstalled.
4.3.4Dropletseparator
Figure4.3CoolingcoilA A
A
anddropletseparatorB B
B
Acoolingsectioncanbeequippedwithadropletseparatortoremovedropletcarry-overfromthecooling
coil.
16MaincomponentsdescriptionTEN-DSC-E1708
DesiCool
Thedropletseparatorisbuiltfromapatentedthree-plane-utedpadthatissetatanangletotheowofair.
Theseparatorabsorbsthewaterdropletsandtransportsthemdownthroughthematerialtothedrainage
section.
4.3.5Cleaning
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Coilnshavesharpedges.Alwayswearprotectivegloveswhenworkingwithcoils.
1.Thecoilsshouldbecheckedatleastonceayear,andcleanedifrequired.
2.Someofthedustwhichpassesthroughthelterscomestorestonthecoilcells.Thislayerofdust
affectstheairowandreducestherateofexchangeleadingtodecreasedunitefciency.
3.Thecoilsshouldthereforebekeptclean.Cleaningcanbedonebyusingavacuumcleaner,lowpressure
compressedairorlowpressurewaterandasoftbrush.Donotforgettocleantheunitinternallyafterthe
coilcleaning.NeveruseHPcleaners,thiswilldamagethecoilns.
4.Furthermore,inthecaseofcoolingcoils,cleanthedriptrayandsiphonforthecondensationwateronce
peryear.Notethatsiphonsneedtoberelledwithwaterafterthewinterseason.
4.3.6Stoppingwaterowtothecoils
Precautionstotakeincaseoffrostrisk:
-whereitisenvisagedtostoporconsiderablyreducetheowofhotwater,allthefreshairintakesmust
beclosedandtheventilationstopped.
-thereferencepointoftheantifreezethermostatmustnotbesettoolow.
-ifforwhateverreasonabuildingisnotheatedinwinter,thecoilsaswellasthepipingmustbeemptied.
Hotwatercoils
Makesurethatthetemperatureofthehotwaterisnottoolow,andthatthecirculationofthewateris
maintained.Ensurethat:
■thevalvesareopen.
■thepipingispurgedfromremaininggases.
■thehotwatercirculationpumpoperatesevenatnight.
Coolingcoils
Coolingcoilsmustbepurgedifthepassingairtemperatureislowerthanthefreezingpointofthecoolant.
Wherethecoilsaresuppliedwithwaterwhichdoesnotcontainglycol,andnopreheatercoilisinstalled,itis
thereforenecessarytoemptythecoilsassoonasthepassingairtemperaturereaches0°C.
TEN-DSC-E1708Maincomponentsdescription17
DesiCool
4.4Evaporativecoolers/humidiers
Evaporativecoolers/humidiersareplacedbothinthesupplyandexhaustairstreams.
Theycanhaveeitheradirectwatersupply,orarecirculatedsystem.
TheheartoftheFA6cooler/humidierisacassettemadefrominorganicevaporativemedia–GLASdek®.
Waterissuppliedtothetopoftheevaporativemediaviaadistributionheader.Thewaterowsdown
thecorrugatedsurfaceofthemedia.Asthewarmanddryairpassesthroughthemediaitevaporatesa
proportionofthewaterandthusproducescool,humidiedair.Therestofthewaterassistsinwashingthe
media,andisdrainedbacktothetank.Inthecaseofarecirculatedsystem,theremustbeableed-offandan
automaticdrainageinordertoavoidcontaminationofthewater.
Theenergythatisneededfortheevaporationistakenfromtheairitself.Theairthatleavesthehumidieris
thereforehumidiedandcooledsimultaneouslywithoutanyexternalenergysupplyfortheevaporation.
Thisisinessencetheadiabaticcoolingprocess.Itisveryefcientandtheconsumptionofenergyisverylow.
Periodicmaintenanceofthecoolersisrecommendedonceayear,followingtheoperatingseason.
Figure4.4Openthesafetycatchonthedistributionheaderbyturningaquarterturn
1.Cleanthedistributionheader.
2.Cleanthepumplter.
3.Cleanthereservoir.
4.Checkthefunctionofthelevelswitch.
5.Checkthefunctionofthebleed-offvalve.
18MaincomponentsdescriptionTEN-DSC-E1708
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