Munters ML270 - Page 30

DehumidierML180-MLT350
8.3Faulttracinglist
ThecontrolpanelLEDaretheprimarysourceofinformationforfaulttracingwhentheunithasgivenan
alarmandstoppedautomatically.
GothroughthefaulttracinglistbelowbeforecontactingMuntersservicedepartment.Thelistcontains
informationforidentifyingfaultsthatareeasytorepairwithoutthehelpofatechnician.
IftheunitisequippedwiththehumidityregulationsystemRH98,seealsoappendix
1.3,Humiditycontrolsystem.
Symptom
IndicatorsPossiblecause
Correctiveaction
Powersupplyfailure.Checkthepowersupplytotheunit.
Unithas
stopped.
Alloff.
TransformerTC18fuseFU18failure.Investigatethecauseofthefaultandrectify.Replacethe
fuse.
UnitswitchedtoAUTOmaticmode
bymistakewithnohumiditysensor
connected.
SetthemodeswitchtoMANual,andcheckthattheunit
starts.
SetthemodeswitchtoMANual,andcheckthattheunit
starts.Iftheunitstarts,thehumiditysensorisprobablyat
fault.
Unithas
stopped.
No3&4are
on
Humidistatfault(AUTOmaticmode)
SetthemodeswitchtoAUTOmaticmode,andcheck
thehumiditysensorbyseeingifthedehumidierstarts
whenthehumiditysensorsetpointisreduced.Resetthe
humiditysensorsetpointafterthecheck.Calibratethe
humiditysensor(inaccordancewiththemanufacturer’s
recommendations)ifnecessaryorreplace
Switchoffthemainssupplyandallowtheunittocooldown.
Checkthattheairinlet,outletductsandltersarefreefrom
obstructionsandarenotcloggedwithdirt
Hightemperaturecut-out(BT20)has
tripped
Resetthecutoutwhentheunithascooleddown.
Resetthecutout
Unithas
stopped.
No5&3are
on
Reactivationairowissettoolow.
Restarttheunitandadjustthereactivationairow,see
section5.2,Airowcheckandadjustment.
ML180&MLT350:CircuitBreaker
QM12trippedduetoadrivemotor,fan
faultorreactivationheaterfault.
Switchoffthemainssupplyandallowtheunittocool
down.ResetcircuitbreakerQM12.Investigatethecauseof
thefaultandrectifyorcallMunters.
ML270:CircuitBreakerQM12tripped
duetoadrivemotororfanmotorfault.
CircuitBreakerQM15trippedduetoa
reactivationheaterfault.
Switchoffthemainssupplyandallowtheunittocooldown.
ResetcircuitbreakersQM12&QM15.Investigatethecause
ofthefaultandrectifyorcallMunters.
Unithas
stopped.
No.5,3&4
areon.
Aircooledcondensormodels:ML180
&MLT350:CircuitBreakerQM12
trippedduetoadrivemotor,fanfault,
condensorfanfaultorcondensorheater
fault.
InvestigatethecauseofthefaultandrectifyorcallMunters.
ResetQM12.
Unithas
stopped.
No.5,3&4
areon.
ML270:CircuitBreakerQM12
trippedduetoadrivemotor,fanfault,
condensorfanfaultorcondensorheater
fault.CircuitBreakerQM15trippeddue
toareactivationheaterfault.
Investigatethecauseofthefaultandrectify.ResetQM12
andQM15.
Heatingcapacityistoolow.
Checktheoperationoftheheater.
Reactivationandprocessairowsare
notinaccordancewiththeratedairow.
Checkandadjustthereactivationandprocessairows,see
section5.2,Airowcheckandadjustment.
Rotordrivefailure.Checkrotordrivebeltanddrivemotor.
Lossof
performance:
Dehumidier
appearsto
beoperating
correctly,butis
notcontrolling
thehumidity
HumiditysensororRH98not
functioningcorrectly(AUTOmatic
mode).
Checktheoperationandcalibrationofthehumidity
sensororRH98inaccordancewiththemanufacturer’s
recommendations.
Table8.1Faulttracinglist
26Faulttracing190TGB-1034-L1604