Munters M120 - Fault Tracing

M120
7Faulttracing
FaultsymptomPossibleCauseCorrectiveaction
FailureoftheelectricalsupplyCheckpowersupplytotheunit.
Presstheresetbuttononthethermalcut-outafterremovingthe
obstruction
Checkthatthetemperatureatthereactivationairintakedoes
notexceed45ºC.
Checkthatthesupplyvoltageisnotmorethan10%abovethat
speciedonthedataplate.
Checkthattheimpellerrunsfreely.
Checkthemotor’spowerconsumption(maximum0.26A).
Thethermostatontheheaterhastripped
becauseofacloggedlteroranyother
obstructionintheductsystem.
Settheoperatingmodetomanualmodeandcheckthatthe
dehumidierstarts
Humidistatswitchedtoautomaticmodeby
mistakewithnohumidistatconnected.
Settheoperatingmodetomanualmodeandcheckthatthe
dehumidierstarts
Settheoperatingmodetomanualmodeandcheckthatthe
dehumidierstarts.Iftheunitstarts,thehumidistatisprobably
faulty.
Unithasstopped.
Humidistatfault(automaticmodes).
Checkthehumidistatbyseeingifthedehumidierstartswhen
thehumidistatsetpointisreduced.Resetthehumidistatset
pointafterthecheck.Calibratethehumidistatifnecessaryor
replaceit.
RotorstoppedRemoveplasticplugfromtheinspectionopening,situated
onthesideoftheunit,andcheckthattherotoristurning
(approximately8rph)
ReactivationairowincorrectCheckreactivationairowasspeciedundersection
4.7,Reactivationairowadjustment.
Dehumidication
capacityhasdecreased.
ReactivationheaternotoperatingCheckthatthereactivationheaterisoperatingbymeasuringthe
powerconsumption.Example:At230V50Hzthetotalpower
consumptionisapproximately5.7A.
Table7.1Faulttracinglist
17Faulttracing190TGB-1008-H1402