Munters ML420 User Manual

DehumidierML420-MLT1400
4.6PrecautionarymeasuresforunitswithLIdesiccantrotor
ThestandarddeliveryisMuntershighperformancedesiccantrotorHPS(HighPerformanceSilicagel).
IfthedehumidierisdeliveredwithanLIrotor(lithiumchloride)itisimportantthattherotordoesnot
becomeloadedwithmoisturewhenthedehumidierisoff.
NOTE!Makesurethatnoairpassingthroughtherotorhasarelativehumiditygreaterthan80%.
Itisrecommendedtoinstallclosingdampersintheprocessandreactivationairinletstoavoidthatairwith
highrelativehumidityisdrawnthroughtherotorandintotheroom.
Thisisparticularlyimportantwhentheprocessairisdrawnfromoutdoors,orwhenthesystemhasbeen
ttedwithapre-cooler.
4.7Electricalconnections
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Allelectricalequipmentconnectionsmustbecarriedoutinaccordancewithlocalregulationsandbyqualied
personnel.Riskofelectricalshock.
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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
0,75mm
2
andmusthaveaninsulationresistanceratinginexcessof500VAC.
■ThehumiditysensormustbedesignedsothatthecontactscloseonarisingRHtocompletethecontrol
circuitandstartthedehumidier.
190TGB-1035-H1604Installation13

Munters ML420 Specifications

General

Brand	Munters
Model	ML420
Category	Dehumidifier
Language	English