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DehumidierML420-MLT1400

4.Setthemodeswitchonthecontrolpanelto”0”andcheckthatboththeindicatorlampsforthe

reactivationheatergoout.

NOTE!Inordertodissipateanyresidualheat,thereactivationairfan,processairfanandthedrivemotorwill

continuetorun(aftertheunithasbeenswitchedoff)untilthetemperaturehasfallenbelow50°C.

5.Checkthattheprocessairfan,reactivationairfananddrivemotorindicatorsgooutwhenthe

temperaturefallsbelow50°C,andthatthepowerconnectedindicatorremainson.

Fordetailsontheoperatorpanel,seesection6.4,Operatorpanel

6.6.2Automaticmode–humiditysensorconnected

Asingleortwostagehumiditysensormustbeconnectedfortheunittoberuninautomaticmode.For

furtherinformation,seesection5.1.2,Single-stagehumiditysensorand5.1.3,Two-stagehumiditysensor.

1.SetthemodeswitchtoAUT.

2.AdjustthehumiditysensorsetpointtothelowestRHvalue.Setthemainpowerswitchto”1”(on).

Checkthatthefollowingindicatorlampsareonandthattheunitisrunning.

■Mainssupplyconnectionindicator

■Unitrunningindicator*

■Bothreactivationheaterindicators*

■Bothprocessairandreactivationairfanindicators*

■Drivemotorindicator*

NOTE!IfthecurrentRHvalueintheroomtobedehumidiedislowerthanthesetpointonthehumiditysensor,

theaboveindicatorswillnotlightandthedehumidierwillnotstart.

3.Slowlyincreasethehumiditysetpointandcheckthattheunitswitchesoffwhenthesetpointmatchesthe

RHintheroomwherethehumiditysensorisinstalled.

4.Slowlydecreasethehumiditysetpointandcheckthattheunitswitchesonwhenthesetpointfallsbelow

theRHintheroomwherethehumiditysensorisinstalled.

5.Setthemodeswitchonthecontrolpanelto”0”andcheckthatboththeindicatorlampsforthe

reactivationheatergoout.

NOTE!Inorderfortheunit’sheaterstocooldown,thereactivationairfan,processairfanandthedrivemotorwill

continuetorun(aftertheunithasbeenswitchedoff)untilthetemperaturehasfallenbelow50°C.

6.Checkthattheprocessairfan,reactivationairfananddrivemotorindicatorsgooutwhenthe

temperaturefallsbelow50°Candtheunitisrunning,andthatthepowerconnectedindicatorremains

on.

7.AdjustthehumiditysetpointtothedesiredRHvalue.

Fordetailsontheoperatorpanel,seesection6.4,Operatorpanel

6.6.3Automaticmode-RH98orVariDry(option)

IftheunitisttedwithafactoryinstalledRH98orVariDry(option)humiditycontrolsystem,theexternal

humiditysensormustbeinstalledandcorrectlyconnectedtotheunit.Thesamesiterequirementsapplyto

thehumiditysensorandRH98orVariDry,seesection4.8,Externalhumiditysensor.

Formoreoperationaldetails,seeappendix1.6,Humiditycontrolsystem.

1.SetthemodeswitchtoAUT.

22Operation190TGB-1035-H1604

Munters ML420 User Manual

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