Munters ML690 - Page 34

DehumidierML420-MLT1400
SymptomIndicatorsPossiblecauseCorrectiveaction
Safetydevicehastrippeddueto
oneofthefollowing:
Switchoffthemainssupplyandallowtheunittocooldown.
FanmotorfaultInvestigatethecauseofthefault,andrectify.
DrivemotorfaultML420:ResetQM16-drivemotor,reactivationfanandprocessfan.
ML690-MLT1400:ResetQM16-reactivationfan.
ResetQM21-drivemotororprocessfan.ResetQM18forunitswitha
condenser.
RotorstopwarningInvestigatethecauseofthe“rotorstopped”warningandrectifythe
fault.
Unithas
stopped.
No.12,2,8
and/or9are
ashing.
WiringfaultSwitchonthemainssupplyatthemainssupplyswitch,andstartthe
unittoresetthefaultwarning.Ifthefaultreoccurs,contactMunters.
No.11and
12.
Unitsttedwithanair-cooled
condenser:
Safetydeviceshavetrippeddueto
acondenserfanfault.
Switchoffthemainssupplyandallowtheunittocooldown.Investigate
thecauseofthefault,andrectify.
ResetQM21.
Unithas
stopped.
OnlyNo.
12.
Safetydeviceshavetripped
duetoacondenserheaterfault
(reactivationairtemperature)
Investigatethecauseofthefault,andrectify.
ResetQM23.
Lossof
performance:
Temperatureincreaseacrossthe
reactivationbatteryistoolow.
Checkthefunctionofthereactivationheater.
Reactivationandprocessairows
donotcorrespondtotherated
airows.
Checkandadjustthereactivationairow,seesection
5.3,Airowcheckandadjustment.
Rotordrivefailure.Checkrotordrivebeltanddrivemotor.
Dehumidier
appearsto
beoperating
correctly,
butisnot
controlling
thehumidity
Incorrectfunctioningofhumidity
sensor,RH98orVariDry
(AUTomaticmode).
Checktheoperationandconnectionofthehumiditysensor,RH98or
VariDryinaccordancewiththemanufacturer’srecommendations.
Table8.1Faulttracinglist
30Faulttracing190TGB-1035-H1604