Munters ML420 User manual

Originalinstructions
Usermanual
ML420,ML690,MLT800
ML1100,ML1350,MLT1400
Desiccantdehumidier
190TGB-1035-H1604©MuntersEuropeAB2016

Importantuserinformation
Intendeduse
Muntersdehumidiersareintendedtobeusedforthe
dehumidicationofair.Anyotheruseoftheunit,or
usewhichiscontrarytotheinstructionsgiveninthis
manual,cancausepersonalinjuryanddamagetotheunit
andotherproperty.
Nomodicationoftheunitisallowedwithoutprior
approvalbyMunters.Attachmentorinstallation
ofadditionaldevicesisonlyallowedafterwritten
agreementbyMunters.
Warranty
Thewarrantyperiodisvalidfromthedatetheunit
leftourfactory,unlessotherwisestatedinwriting.
Thewarrantyislimitedtoafreeexchangeofpartsor
componentswhichhavefailedasaresultofdefectsin
materialsorworkmanship.
Allwarrantyclaimsmustincludeproofthatthe
faulthasoccurredwithinthewarrantyperiodand
thattheunithasbeenusedinaccordancewiththe
specications.Allclaimsmustspecifytheunittypeand
fabricationnumber.Thisinformationisstampedonthe
identicationplate,seesectionMarking.
Itisaconditionofthewarrantythattheunitforthefull
warrantyperiodisservicedandmaintainedbyaqualied
MuntersengineerorMuntersapprovedengineer.
Accesstospecicandcalibratedtestequipmentis
necessary.Theserviceandmaintenancemustbe
documentedforthewarrantytobevalid.
AlwayscontactMuntersforserviceorrepair.Operating
faultscanoccuriftheunitismaintainedinsufcientlyor
incorrectly.
Safety
Informationaboutdangersareinthismanualindicated
bythecommonhazardsymbol:
W W
WARNING! ARNING! ARNING!
Indicatesapossibledangerthatcanleadtopersonalinjury.
CA CA
CAUTION! UTION! UTION!
Indicatesapossibledangerthatcanleadtodamagetothe
unitorotherproperty,orcauseenvironmentaldamage.
NOTE!Highlightssupplementaryinformationforoptimal
useoftheunit.
ConformitywithDirectives
Thedehumidierisinconformitywiththeessential
safetyrequirementsoftheMachineryDirective
2006/42/EC,andinconformitywiththeprovisionsof
theEcodesignDirective(ErP)2009/125/EC,andof
theEMCDirective2004/108/EC.Thedehumidieris
manufacturedbyanorganizationcertiedaccordingto
ISO9001andISO14001.
Copyright
Thecontentsofthismanualcanbechangedwithout
priornotice.
NOTE!Thismanualcontainsinformationwhichis
protectedbycopyrightlaws.Itisnotallowedtoreproduceor
transmitanypartofthismanualwithoutwrittenconsentfrom
Munters.
Pleasesendanycommentsregardingthismanualto:
MuntersEuropeAB
TechnicalDocumentation
P.O.Box1150
SE-16426KISTASweden
e-mail:[e-mail]
iiImportantuserinformation190TGB-1035-H1604

Tableofcontents
Importantuserinformation...............ii
Intendeduse...........................ii
Warranty...............................ii
Safety..................................ii
ConformitywithDirectives............ii
Copyright..............................ii
Tableofcontents...........................iii
1Introduction.................................1
1.1Aboutthismanual.....................1
1.2Unintendeduse........................1
1.3Safetyandcautions...................1
1.4Markings...............................3
1.5Supervisionofoperation..............3
1.6Faultindications.......................3
2Dehumidierdesign.......................4
2.1Productdescription...................4
2.2Functiondescription..................4
2.3Maincomponents.....................5
3Transport,inspectionandstorage.......6
3.1Transport..............................6
3.2Inspectionofdelivery..................6
3.3Storingtheequipment................6
4Installation...................................7
4.1Safety..................................7
4.2Siterequirements.....................7
4.3Foundation............................8
4.4Mirrorhandedductconnections......8
4.5Ductinstallation.......................9
4.5.1Generalrecommendations...9
4.5.2Ductforoutdoorairinlet.......12
4.5.3Ductforwetairoutlet...........12
4.6Precautionarymeasuresforunitswith
LIdesiccantrotor......................13
4.7Electricalconnections................13
4.8Externalhumiditysensor.............13
4.9Gasreactivation(ML1100units
only)....................................14
5Commissioning.............................15
5.1Settingsbeforestart-up...............15
5.1.1Continuousprocessairfan
operation.......................15
5.1.2Single-stagehumiditysensor.15
5.1.3Two-stagehumiditysensor...15
5.1.4Remotefaultindication........15
5.2Pre-startchecks.......................16
5.3Airowcheckandadjustment........17
6Operation....................................18
6.1General................................18
6.2Quickstop..............................18
6.3Beforestarting.........................18
6.4Operatorpanel........................19
6.5RH98operatorpanel..................21
6.6Operatingtheunit.....................21
6.6.1Manualmode..................21
6.6.2Automaticmode–humidity
sensorconnected..............22
6.6.3Automaticmode-RH98or
VariDry(option)................22
7Serviceandmaintenance.................24
7.1Safety..................................24
7.2General................................24
7.3Serviceoptions........................24
7.4Extendedwarranty....................25
7.5Cleaning...............................25
7.6Serviceandmaintenanceschedule..25
7.7Filterchange...........................27
8Faulttracing.................................28
8.1General................................28
8.2Safety..................................28
8.3Faulttracinglist........................29
9Technicalspecication....................31
9.1Dimensionsandservicespace.......31
9.2Capacitydiagrams....................32
9.3Technicaldata.........................34
9.4Sounddata.............................36
9.4.1SounddataML420............36
9.4.2SounddataML690............37
9.4.3SounddataMLT800...........37
9.4.4SounddataML1100...........38
9.4.5SounddataML1350...........38
9.4.6SounddataMLT1400..........39
10Scrapping....................................40
190TGB-1035-H1604Tableofcontentsiii

Appendix1Options.............................41
1.1General................................41
1.2Runningtimemeter...................41
1.3Rotorstopalarm.......................41
1.4Blockedlteralarm....................41
1.5Filterbox-M5andF7..................41
1.6Humiditycontrolsystem..............42
1.6.1Introduction....................42
1.6.2Transmitter.....................42
1.6.3Controlunit.....................42
1.6.4Setpointsandcontrol
parameters.....................43
1.6.5Display/changesetpointfor
relativehumidity...............44
1.6.6Display/changeother
parameters.....................44
1.6.7Processalarms................47
2ContactMunters............................49
ivTableofcontents190TGB-1035-H1604

DehumidierML420-MLT1400
1Introduction
1.1Aboutthismanual
Thismanualiswrittenfortheuserofthedehumidier.Itcontainsnecessaryinformationforhowtoinstall
andusethedehumidierinasafeandefcientway.Readthroughthemanualbeforethedehumidieris
installedandused.
ContactyournearestMuntersofceifyouhaveanyquestionsregardingtheinstallationortheuseofyour
dehumidier.
Thismanualmustbestoredinapermanentlocationclosetothedehumidier.
1.2Unintendeduse
■Thedehumidierisnotintendedforoutdoorinstallation.
■Thedehumidierisnotintendedforuseinclassiedareaswhereexplosionsafetycompliantequipment
isrequired.
■Thedehumidiermustnotbeinstallednearanyheatgeneratingdevicesthatcancausedamagetothe
equipment.
1.3Safetyandcautions
Everymeasurehasbeentakeninthedesignandmanufactureofthedehumidiertoensurethatitmeetsthe
safetyrequirementsofthedirectivesandstandardslistedintheECDeclarationofConformity.
Theinformationinthismanualshallinnowaytakeprecedenceoverindividualresponsibilitiesorlocal
regulations.
Duringoperationandotherworkwithamachineitisalwaystheresponsibilityoftheindividualtoconsider
thefollowing:
■Thesafetyofallpersonsconcerned.
■Thesafetyoftheunitandotherproperty.
■Theprotectionoftheenvironment.
ThetypesofdangersthatareindicatedinthismanualaredescribedinthesectionImportantuserinformation.
190TGB-1035-H1604Introduction1

DehumidierML420-MLT1400
W W
WARNING! ARNING! ARNING!
-Theunitmustnotbesplashedwithorimmersedinwater.
-Theunitmustneverbeconnectedtoavoltageorfrequencyotherthanthatforwhichitwasdesigned.Refertothe
identicationplate.Linevoltagethatistoohighcancauseanelectricalshockhazardanddamagetotheunit.
-Donotinsertngersoranyobjectsintotheairvents.
-Allelectricalinstallationsmustbecarriedoutbyaqualiedelectricianandinaccordancewithlocalregulations.
-Thedehumidiercanrestartautomaticallyafterapowercut.Alwayssetandlockthemainpowerswitchinthe
OFFpositionbeforecarryingoutanyservicework.
-Useonlyapprovedliftingequipmenttopreventpersonalinjuryanddamagetotheequipment.
-AlwayscontactMuntersforserviceorrepair.
2Introduction190TGB-1035-H1604

DehumidierML420-MLT1400
1.4Markings
Reg.luft
Reac.air
Reg.Luft
Airderegeneration
' ' '
Processluft
Processair
Prozessluft
Airatraiter
`
Våtluft
Wetair
Nassluft
Airhumide
Torrluft
Dryair
Trockenluft
Airsec
3
1
4
5
2
Figure1.1Identicationplateandmarkings
Figure1.2Identicationplate,example
3
Figure1.3Labelsforairinletsandoutlets
1.Unitidenticationplate4.Processairinlet
2.Dryairoutlet5.Reactivationairinlet
3.Wetairoutlet
Explanationof"Fabr.no"ontheidenticationplate:
09=yearofmanufacture,19=weekofmanufacture,190XXX=articlenumber,XXXXX=serialnumber
1.5Supervisionofoperation
Thedehumidieriscontrolledandmonitoredusingtheoperatorpanellocatedonthefrontoftheunit.
1.6Faultindications
Faultsareclearlyindicatedontheoperatorpanel,seesection6.4,Operatorpanel.
Alarmsrelatingtorelativeairhumidityaregiveninthedisplayofthehumiditycontrolsystem(ifinstalled),
seeappendix1.6,Humiditycontrolsystem.
190TGB-1035-H1604Introduction3

DehumidierML420-MLT1400
2Dehumidierdesign
2.1Productdescription
ThedesiccantdehumidiersintheMLserieshavebeendevelopedtoeffectivelydehumidifytheairin
environmentsrequiringlowairhumidity.
Thedehumidierisequippedwithanencapsulatedrotorunit.Therotorcasingisconstructedofdurable
thermosetplasticandcontainsisolatedsectionsthatprovideaprecisebalanceforthedehumidication,
reactivationandheatrecoveryairows.
ThedehumidierismanufacturedinaccordancewithuniformEuropeanstandardsandestablished
requirementsforCE-marking.
2.2Functiondescription
1.Processair
2.Dryair
3.Reactivationair
2
4
3
1
Figure2.1Internalairows
4.Wetair
Thedesiccantrotoristheadsorptiondehumidifyingcomponentintheunit.Therotorstructureis
comprisedofalargenumberofsmallairchannels.
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.
4Dehumidierdesign190TGB-1035-H1604

DehumidierML420-MLT1400
2.3Maincomponents
11
1
4
5
6
8
9
2
16
3
12
14 13
15
10
7
Figure2.2Maincomponents
1.Lowerrotorcover9.Drivemotor
2.Roller,beltguide10.Pulley,beltdrive
3.Drivebelt11.Reactivationairlter
4.Rotor12.Reactivationairimpeller
5.Sealingring,rotor13.Reactivationfanmotor
6.Upperrotorcover14.Processfanmotor
7.Electricalcontrolpanel15.Processairimpeller
8.Reactivationheater16.Processairlter
NOTE!TheML420unithasonlyonefanmotorthatisplacedbetweentheprocessandreactivationimpeller.
190TGB-1035-H1604Dehumidierdesign5

DehumidierML420-MLT1400
3Transport,inspectionandstorage
3.1Transport
Thedehumidierisdeliveredonapalletandmustbehandledcarefully.Allpaneldoorsontheunitmustbe
closedduringtransport.Providedthatthedehumidierisstillsecuredtoitsdeliverypallet,itcanbemoved
usingafork-lifttruck.
W W
WARNING! ARNING! ARNING!
Movethedehumidiercarefullyasthereisariskofthedehumidiertippingover.
Figure3.1Correctlengthonforkliftarms
Weightofthedehumidiercanbefoundinsection9.1,Dimensionsandservicespace.
3.2Inspectionofdelivery
■Doaninspectionofthedeliveryandcomparewiththedeliverynote,orderconrmationorother
deliverydocumentation.Makesurethateverythingisincludedandnothingisdamaged.
■ContactMuntersimmediatelyifthedeliveryisnotcompleteordamagedinordertoavoidinstallation
delays.
■Removeallpackagingmaterialfromtheunit,andmakesurethatnodamagehasbeenmadeduring
transportation.
■AnyvisibledamagemustbereportedinwritingtoMunterswithin3daysandpriortoinstallationof
theunit.
■Discardthepackagingmaterialaccordingtolocalregulations.
3.3Storingtheequipment
Followtheseinstructionsifthedehumidieristobestoredpriortoinstallation:
■Placethedehumidierinanuprightpositiononahorizontalsurface.
■Re-usethepackagingmaterialtoprovideprotectionfortheunit.
■Protectthedehumidierfromphysicaldamage.
■Storethedehumidierundercoverandprotectitfromdust,frost,rainandaggressivecontaminants.
6Transport,inspectionandstorage190TGB-1035-H1604

DehumidierML420-MLT1400
4Installation
4.1Safety
W W
WARNING! ARNING! ARNING!
-Theunitmustnotbesplashedwithorimmersedinwater.
-Theunitmustneverbeconnectedtoavoltageorfrequencyotherthanthatforwhichitwasdesigned.Refertothe
identicationplate.Linevoltagethatistoohighcancauseanelectricalshockhazardanddamagetotheunit.
-Donotinsertngersoranyobjectsintotheairvents.
-Allelectricalinstallationsmustbecarriedoutbyaqualiedelectricianandinaccordancewithlocalregulations.
-Thedehumidiercanrestartautomaticallyafterapowercut.Alwayssetandlockthemainpowerswitchinthe
OFFpositionbeforecarryingoutanyservicework.
-Useonlyapprovedliftingequipmenttopreventpersonalinjuryanddamagetotheequipment.
-AlwayscontactMuntersforserviceorrepair.
CA CA
CAUTION! UTION! UTION!
Thewetairductmustalwaysbeinsulatedwhenthereisariskoffreezing.Condensationbuildsupeasilyonthe
insideoftheductbecauseofthehighmoisturecontentofthewetairleavingthedehumidier.
CA CA
CAUTION! UTION! UTION!
Thedehumidierhasbeendesignedtooperateatspecicprocessairowscorrespondingtothefansizes
installed.
4.2Siterequirements
Thedehumidierisonlyintendedforindoorinstallation.Avoidinstallingthedehumidierinadamp
environmentwherethereisariskofwaterenteringtheunitorinaverydustyenvironment.Ifindoubt,
contactMunters.Itisimportantthattheintendedinstallationsitemeetsthelocationandspacerequirements
fortheequipmentinordertoachievethebestpossibleperformance.
Fortheunitdimensionsandservicespacerequirements,seesection9.1,Dimensionsandservicespace.
NOTE!Ifthereisaneedforreductionofvibrationsfromthedehumidier,contactMuntersforinstructions.
190TGB-1035-H1604Installation7

DehumidierML420-MLT1400
4.3Foundation
Thedehumidiermustbeinstalledonaleveloor,oronaplatformcapableofsupportingthemachine
weight.Ifthemaximumoorloadingweightisnotexceeded,specialfoundationsarenotrequired.
Whenthedehumidierhasbeeninstalled,checkthatitislevel.
Iflocalregulationsrequirethattheunitispermanentlyxedinposition,thexingholescanbeusedfor
boltingtheunittotheoor.
Figure4.1Drillingpattern
4.4Mirrorhandedductconnections
Thefrontandrearpanelsareinterchangeable,sothattheconnectionsforprocessairanddryairmaybe
situatedeitherontheleftorrightsideoftheunit.
Thedehumidiersaredeliveredwiththeprocessanddryairconnectionsontheleftsideoftheunit.If
itisrequiredtochangetheorientation,sothattheconnectionsareontherightsideoftheunit,proceed
asfollows.
W W
WARNING! ARNING! ARNING!
Makesurethatthedehumidierisdisconnectedfromthemainspowerbeforechangingthepositionsofthe
processairanddryairconnections.
8Installation190TGB-1035-H1604

DehumidierML420-MLT1400
Figure4.2ChangingpanelpositionsFigure4.3Rotorstop(E)andltermonitors(F)
1.Removethetwobolts(B)securingthefrontpanelandcarefullyremovethepanel.
2.Removethetwoboltssecuringtherearpanelandcarefullyremovethepanel.
3.Removethetwobolts(A)andwasherssecuringthecontrolandtoppanels,thencarefullyremovethe
toppanel.
4.Removethecableductcovers(C),re-routethecablesandtthecontrolpanel(D)ontotheoppositeside
oftheunit.Retthecableductcovers.
5.Loosentherotorstop(E)andthetwoltermonitors(F).Removethecableties.
6.Fittherotorstopandltermonitorsontheoppositesideoftheunit.Tiethecables.
7.Fitthefront,rearandtoppanelsintheirnewpositions.
4.5Ductinstallation
4.5.1Generalrecommendations
Theconnectionsforprocessandreactivationairaredesignedinaccordancewiththerecommendationsin
ISO13351.TherectangularductconnectionscontaintappedinsertsforM8screws.
Figure4.4Ductconnections
190TGB-1035-H1604Installation9

DehumidierML420-MLT1400
Partnumber170-013448–005170-013448–004170-013448–003170-013448–002170-013448–001
AØ100Ø125Ø160Ø200Ø250
BSeesection9.1,Dimensionsandservicespace.
L(mm)210210200140150
ML420XX
ML690XX
MLT800XX
ML1100XX
ML1350XX
MLT1400XX
CA CA
CAUTION! UTION! UTION!
Thedehumidierhasbeendesignedtooperateatspecicprocessairowscorrespondingtothefansizes
installed.
■Theprocessairanddryairductsshouldbethesamediameter.Thesameappliestothereactivationair
andwetairducts.
■Thelengthofductworkmustbekeptasshortaspossibletominimisestaticairpressurelosses.
■Tomaintainperformance,allrigidprocessorreactivationairductworkjointsmustbeairandvapour
tight.
■Theprocessairductworkmustbeinsulatedtopreventcondensationdevelopingontheoutsideofthe
duct,wheneverthetemperatureoftheairwithintheductfallsbelowthedewpointtemperatureofthe
ambientairthroughwhichtheductworkisrouted.
■Theductsmustalwaysbeinsulatedwhenthereisariskoffreezing.
■Thewetairleavingthedehumidierwill,becauseofhighmoisturecontent,condenseontheinsideduct
walls.Byinsulatingtheducts,theamountofcondensateisreduced.
■Horizontalwetairductsmustbeinstalledwithaslightdecline(awayfromthedehumidier)todrain
awaypossiblecondensation.Suitablecondensationdrainsmustbeinstalledatlowpointsinthewet
airoutletduct,seeFigure4.7.
■Ensurethataccessforoperationandservicingisnotrestrictedwhendesigningandinstallingducting.
Formoreinformation,refertosection9.1,Dimensionsandservicespace.
■Toreducenoiseand/orvibrationbeingtransmittedalongrigidducts,goodquality,airtightexible
connectionscanbetted.
■Ductsmounteddirectlyontotheunitmustbeindependentlysupportedtominimisetheloadontheunit.
■Dampersforadjustingtheairowsmustbeinstalledinthesupplyairoutletandreactivationairinlet
ducts.Correctairowsareessentialfortheoperatingefciencyoftheunit.Forairowadjustment
instructions,seesection5.3,Airowcheckandadjustment.
■Thetotalpressuredropintheprocessandreactivationductworkmustnotexceedtheavailablepressure
ofthefansttedtothedehumidier.Fordetailsofminimumavailablestaticpressure,seesection
9.3,Technicaldata.
10Installation190TGB-1035-H1604

DehumidierML420-MLT1400
ML
Munter s
420
1
2
3
5
5
4
C
B
D
A
Figure4.5Ductsrequiredforinstallation
A.Processairinlet1.Dryairdamper
B.Dryairoutlet2.Externallterbox(option)
C.Reactivationairinlet3.Ducttransition
D.Wetairoutlet4.Reactivationairdamper
5.Outlet/inletduct(wirenetting)
190TGB-1035-H1604Installation11

DehumidierML420-MLT1400
4.5.2Ductforoutdoorairinlet
Whenbringingambientairfromoutdoorsintothedehumidier,theinletductopeningmustbelocated
sufcientlyhighabovegroundleveltopreventdustanddebrisfromentering.
Theductingmustbedesignedtopreventrainandsnowfrombeingdrawnintothedehumidier.Theair
inletmustbelocatedawayfrompossiblecontaminantssuchasengineexhaustgases,steamandharmful
vapours.
Topreventthewet(outlet)airfromhumidifyingthereactivation(inlet)air,theairinletforreactivationmust
belocatedatleast2mfromthewetairoutlet.
Attachawirenetwithameshwidthofapproximately10mmintheouterendoftheducttopreventanimals
fromenteringthedehumidierducting.
Figure4.6Outdoorairinletdesign
A.Rectangularducting
B.Roundducting
C.Wirenetting
4.5.3Ductforwetairoutlet
Thematerialforthewetairductmustwithstandcorrosionandtemperaturesofupto100°C.Thewetair
ductingmustalwaysbeinsulatedifthereisariskofcondensation.Thewetairleavingthedehumidierwill
easilycausecondensationontheinsideoftheductwallsduetothehighmoisturecontent.
Horizontalductsmustbeinstalledslopingdownwards(awayfromthedehumidier)todrainawaypossible
condensation.Theductslopemustbeatleast2cm/m.Inaddition,drainageholes(5mm)shouldbemadeat
lowpointsintheducttopreventwateraccumulation.
Attachawirenetwithameshwidthofapproximately10mmintheouterendoftheducttopreventanimals
fromenteringthedehumidierducting.
Figure4.7Wetairoutletdesign
A.Horizontalwetairoutlet
B.Verticalwetairoutlet
C.Wirenetting
D.Downwardslope
E.Condensatedrainage
12Installation190TGB-1035-H1604

DehumidierML420-MLT1400
4.6PrecautionarymeasuresforunitswithLIdesiccantrotor
ThestandarddeliveryisMuntershighperformancedesiccantrotorHPS(HighPerformanceSilicagel).
IfthedehumidierisdeliveredwithanLIrotor(lithiumchloride)itisimportantthattherotordoesnot
becomeloadedwithmoisturewhenthedehumidierisoff.
NOTE!Makesurethatnoairpassingthroughtherotorhasarelativehumiditygreaterthan80%.
Itisrecommendedtoinstallclosingdampersintheprocessandreactivationairinletstoavoidthatairwith
highrelativehumidityisdrawnthroughtherotorandintotheroom.
Thisisparticularlyimportantwhentheprocessairisdrawnfromoutdoors,orwhenthesystemhasbeen
ttedwithapre-cooler.
4.7Electricalconnections
W W
WARNING! ARNING! ARNING!
Allelectricalequipmentconnectionsmustbecarriedoutinaccordancewithlocalregulationsandbyqualied
personnel.Riskofelectricalshock.
W W
WARNING! ARNING! ARNING!
Theunitmustneverbeconnectedtoavoltageorfrequencyotherthanthatforwhichitwasdesigned.Refertothe
unitidenticationplate.
Eachunitissuppliedcompletewithalltheinternalwiringinstalledandconguredinaccordancewiththe
speciedvoltageandfrequencyontheidenticationplate.
NOTE!Thesupplyvoltagemustnotdifferfromthespeciedoperatingvoltagebymorethan+/-10%.
Forconnectiondetails,seetheidenticationplateandthewiringdiagramorsection9.3,Technicaldata.
4.8Externalhumiditysensor
ML-seriesdehumidiersarewiredsothatwhentheunitissettoAUTOmatic,itcanbecontrolledfrom
anexternallymountedhumiditysensor.
Allmodelshaveatwo-stageheater,andcanbecontrolledbyatwo-stagehumiditysensor.Thismethodis
moreefcientandallowsformoreaccuratedehumidicationcontrol.
Theelectricalconnectionsaremadeatterminalsintheelectricalcontrolpanel.Forwiringandconnection
details,seethewiringdiagram.
NOTE!Wherenohumiditysensorisconnectedtotheunit,thedehumidierwillbeoperatingatmaximumoutput
foraslongastheunitisswitchedon.
Aroomhumiditysensoristobemounted1-1.5mabovetheoor.Itmustbepositionedsothatitisnot
directlyexposedtodryairfromtheunitortohumidairowinginthroughopeningdoors.Positionitaway
fromheatsourcesanddirectsunlight.
■Thehumiditysensorconnectingcableshouldhaveaconductorareaofnotlessthan
0,75mm2andmusthaveaninsulationresistanceratinginexcessof500VAC.
■ThehumiditysensormustbedesignedsothatthecontactscloseonarisingRHtocompletethecontrol
circuitandstartthedehumidier.
190TGB-1035-H1604Installation13

DehumidierML420-MLT1400
■Voltagedropscanoccurwhenusingexcessivelylongcables.
Ifthevoltageacrosstheterminalsusedforconnectingthehumiditysensorislessthan20VAC,aseparate
relaycontrolledbythehumiditysensormustbeused.
4.9Gasreactivation(ML1100unitsonly)
Forfurtherinformationoninstallation,start-upandmaintenanceofgasburners,seeappendixaboutgas
reactivationprovidedwiththeunit.
14Installation190TGB-1035-H1604

DehumidierML420-MLT1400
5Commissioning
TheML420-MLT1400dehumidiershaveseveralstandardfunctionsthatneedtobesetbeforeinitial
start-up.Someofthefunctionsrequireconnectiontoexternalequipment.
Somefeaturesrequireconnectionofexternalequipment.Forwiringdetails,seethewiringdiagram.
5.1Settingsbeforestart-up
5.1.1Continuousprocessairfanoperation
Standardsettingsautomaticallyactivatetheprocessairfanonlywhendehumidicationisrequired.
However,continuousprocessairowcanbedesirableevenwhendehumidicationisnotrequired.
Continuousprocessairowcanbeset,seethewiringdiagram.
5.1.2Single-stagehumiditysensor
NOTE!Whennohumiditysensorisconnected,thedehumidierwillrunatmaximumeffectcontinuously.
Ifasingle-stagehumiditysensoristted,thiswillswitchthedehumidieronandoff.Asingle-stage
humiditysensorisconnectedaccordingtothewiringdiagram.
Tomaintainaircirculation,preselectcontinuousoperationoftheprocessairfaneventhough
dehumidicationisnotrequired.Forfurtherinformation,seesection5.1.1,Continuousprocessairfanoperation.
5.1.3Two-stagehumiditysensor
NOTE!Whennohumiditysensorisconnected,thedehumidierwillrunatmaximumeffectcontinuously.
Ifatwo-stagehumiditysensorisconnected,thiswillcontrolthereactivationheaterintwostages.The
reactivationpoweriscontrolledonthebasisofthehumiditysensorreadingandthesetpoint.Atwo-stage
humiditysensorisconnectedaccordingtothewiringdiagram.
Tomaintainaircirculation,preselectcontinuousoperationoftheprocessairfaneventhough
dehumidicationisnotrequired.Forfurtherinformation,seesection5.1.1,Continuousprocessairfanoperation.
5.1.4Remotefaultindication
ThePCBdisplaycanbeusedforageneralindicationofthefollowingfaultsonthedehumidier:
■Processairfan
■Reactivationairfan
■Drivemotor
■Heater
■Auxiliaryequipmentinput
■Rotorhasstopped(ifthisoptionisinstalled)
■Blockedprocessairlter(ifthisoptionisinstalled)
■Blockedreactivationairlter(ifthisoptionisinstalled)
190TGB-1035-H1604Commissioning15

DehumidierML420-MLT1400
5.2Pre-startchecks
W W
WARNING! ARNING! ARNING!
Installation,adjustments,maintenanceandrepairsmustonlybecarriedoutbyqualiedpersonnelwhoare
awareoftherisksinvolvedwhenworkingwithequipmentoperatingwithhighelectricalvoltageandhighmachine
temperatures.
Beforestartingthedehumidierforthersttime,ensurethatthemainspowersupplyisisolatedfromthe
dehumidierandcarry-outthefollowingchecks:
1.CheckthattheModeswitchonthedehumidierisinthe“OFF”position,seesection6.4,Operatorpanel.
2.Checktheairintakeltersfordamageandproperxationandalsocheckthatallareasinsidetheunitare
clean.
3.Visuallyinspectallductingandductconnectionstomakesurethatallconnectionshavebeencorrectly
installedandthattherearenosignsofdamagetothesystem.Alsocheckthatallductsarefreefrom
obstaclesblockingtheairpassage.
4.Removethetoppanelandcheckthatnoneofthemaincontactbreakersintheelectricaloperatorpanel
havebeentripped.Fordetailsrefertothewiringdiagramsprovidedwiththeunit.
5.Checkthattheincomingpowersupplyvoltageiscorrectandthatthecablesarecorrectlyconnected.
6.Checktherotationdirectionofthefanimpellerafterconnectiontothepowersupply.Openthefront
panelofthedehumidierandtakeouttheprocesslter.Startthedehumidierandcheckthatthefan
impellerisrotating.Switchoffthedehumidierandwatchthefanimpellerjustbeforeitstopsrotating.
Checkthatitisrotatingclockwise.
7.Ifanexternalhumiditysensorisused,checkthatthesensoriscorrectlypositionedintheroomandis
correctlyconnectedtotheunit,seesection4.8,Externalhumiditysensor.
8.Settheprocessandreactivationairowdamperstothefullyopenposition.
16Commissioning190TGB-1035-H1604