Midea MSC-09HRFN1-QD2E User manual

SERVICE MANUAL
MIDEAAIRCONDITIONER
3DDCINVERTER
SPLITWALL-MOUNTEDTYPE
MSC-09HRFN1-QD2E
MSC-12HRFN1-QD2E
V1.1
May,2010

CONTENTS
1.Precaution...............................................................................................................................1
1.1SafetyPrecaution.................................................................................................................. 1
1.2Warning.............................................................................................................................. 1
2.Function..................................................................................................................................4
3.Dimension...............................................................................................................................6
3.1IndoorUnit.......................................................................................................................... 6
3.2OutdoorUnit........................................................................................................................ 7
4.Specification ...........................................................................................................................8
5.Refrigerantcyclediagram......................................................................................................9
6.Wiringdiagram.....................................................................................................................10
6.1IndoorUnit.........................................................................................................................10
6.2OutdoorUnit.......................................................................................................................10
7.Installation details................................................................................................................12
7.1Wrenchtorquesheetforinstallation........................................................................................12
7.2Connectingthecables...........................................................................................................12
7.3Pipelengthandtheelevation.................................................................................................12
7.4Airpurgingofthepipingandindoorunit..................................................................................12
7.5Pumpingdown(Re-installation)..............................................................................................14
7.6Re-airpurging(Re-installation)...............................................................................................15
7.7Balancerefrigerantofthe2-way,3-wayvalves .........................................................................16
7.8Evacuation..........................................................................................................................17
7.9Gascharging.......................................................................................................................18
8.Operation characteristics.....................................................................................................19
8.1MSC-09HRFN1-QD2E............................................................................................................19
8.2MSC-12HRFN1-QD2E............................................................................................................20
9.Electronicfunction................................................................................................................21
9.1Abbreviation........................................................................................................................21
9.2Display function...................................................................................................................21
9.3Protection...........................................................................................................................21
9.4Fan-OnlyMode....................................................................................................................23
9.5CoolingMode ......................................................................................................................23
9.6Dryingmode.......................................................................................................................24
9.7Heatingmode......................................................................................................................24
9.8Automode function..............................................................................................................28
9.9Forced operationfunction......................................................................................................28
9.10 Actionof4-wayvalve..........................................................................................................28
9.11ActionofElectronicControlValve ..29
9.12 Actionof outdoorfan 30
9.13 Oil returnfunction..............................................................................................................31
9.14 Timerfunction...................................................................................................................31
9.15 Sleep functionmode...........................................................................................................32
9.16 Auto-Restartfunction..........................................................................................................32
9.17 Ionizerfunction(optional)....................................................................................................32

9.18 Outdoorheatingcable.......................................................................................................32
10.Troubleshooting.................................................................................................................. 33
10.1Indoor UnitErrorDisplay.....................................................................................................35
10.2DiagnosisandSolution........................................................................................................36
10.3Keypartschecking.............................................................................................................39

1
1.Precaution
1.1SafetyPrecaution
nTopreventinjurytotheuseror other
peopleandpropertydamage,thefollowing
instructionsmustbefollowed.
nIncorrectoperationduetoignoring
instructionwill causeharmor damage.
nBeforeserviceunit,besuretoread
thisservicemanualat first.
1.2Warning
ØInstallation
nDonotuseadefectiveor underrated
circuitbreaker.Use thisapplianceona
dedicatedcircuit.
Thereisrisk offireor electricshock.
nFor electricalwork,contactthe
dealer,seller,aqualifiedelectrician,or an
Authorizedservicecenter.
Donotdisassembleorrepairtheproduct,
thereisriskoffireorelectricshock.
nAlwaysgroundtheproduct.
Thereisrisk offireor electricshock.
nInstall thepanelandthecoverof
control boxsecurely.
Thereisrisk offireofelectricshock.
nAlwaysinstall adedicatedcircuitand
breaker.
Improperwiringor installationmaycause fore
or electricshock.
nUsethecorrectlyratedbreakerof
fuse. Thereisrisk offireor electricshock.
nDonotmodifyor extendthepower
cable. Thereisrisk offireor electricshock.
nDonotinstall,remove,or reinstall
theunitbyyourself(customer).
Thereisrisk offire,electricshock,explosion,
or injury.
nBecautionwhenunpackingand
installingtheproduct.
Sharpedges couldcauseinjury,be especially
carefulofthecase edges andthefinsonthecondenser
andevaporator.
nFor installation,alwayscontactthe
dealeror anAuthorizedservicecenter.
Thereisrisk offire,electricshock,explosion,
or injury.
nDonotinstall theproductona
defectiveinstallationstand.
Itmay cause injury,accident,ordamage to
theproduct.
nBesuretheinstallationareadoesnot
deterioratewithage.
Ifthebasecollapses,theair conditionercould
fallwithit,causingpropertydamage,productfailure,
andpersonalinjury.
nDonotlettheair conditionerrun for
alongtimewhenthehumidityisveryhighanda
door or awindowisleftopen.
Moisturemaycondenseandwetor damage
furniture.
nTakecare toensure thatpowercable
couldnotbepulledoutor damagedduring
operation.
Thereisrisk offireor electricshock.
nDonotplaceanythingonthepower
cable. Thereisrisk offireor electricshock.
nDonotplugor unplugthepower
supplyplugduringoperation.
Thereisrisk offireor electricshock.
nDonottouch(operation) theproduct
withwethands.
Thereisrisk offireor electricshock.
nDonotplaceaheateror other
appliancenearthepowercable.
Thereisrisk offireandelectricshock.
nDonotallowwatertorun into
electricparts.
Itmay cause fire,failureoftheproduct,or
electricshock.
nDonotstoreor use flammablegasor
combustibleneartheproduct.
Thereisrisk offireor failureofproduct.
nDonotusetheproductinatightly
closedspacefor alongtime.
Oxygendeficiencycouldoccur.
nWhenflammablegasleaks,turnoff
thegasandopenawindowfor ventilation
beforeturntheproducton.
Donotusethetelephoneor turnswitcheson
or off. Thereisrisk ofexplosionorfire.
nIfstrangesounds,or small or smoke

2
comesfromproduct.Turnthebreakeroffor
disconnectthepowersupplycable.
Thereisrisk ofelectricshockorfire.
nStopoperationandclosethewindow
instormor hurricane.Ifpossible,removethe
productfromthewindowbeforethehurricane
arrives. Thereisrisk ofpropertydamage,failureof
product,or electricshock.
nDonotopentheinletgrill ofthe
productduringoperation.(Donottouchthe
electrostaticfilter,iftheunitissoequipped.)
Thereisrisk ofphysicalinjury,electricshock,
or productfailure.
nWhentheproductissoaked(flooded
or submerged),contactanAuthorizedservice
center. Thereisrisk offireor electricshock.
nBecautionthat watercouldnot
entertheproduct.
Thereisrisk offire,electricshock,orproduct
damage.nVentilatetheproductfromtimeto
timewhenoperatingittogetherwithastove,
etc. Thereisrisk offireor electricshock.
nTurnthemainpoweroffwhen
cleaningor maintainingtheproduct.
Thereisrisk ofelectricshock.
nWhentheproductisnotbeusedfor a
longtime,disconnectthepowersupplyplugor
turnoff thebreaker.
Thereisrisk ofproductdamage orfailure,or
unintendedoperation.
nTakecaretoensurethatnobody
couldsteponor fall ontotheoutdoor unit.
Thiscouldresultinpersonalinjuryand
productdamage.
ØCAUTION
nAlwayscheckfor gas(refrigerant)
leakageafterinstallationor repair ofproduct.
Lowrefrigerantlevelsmaycausefailureof
product. nInstall thedrainhosetoensurethat
waterisdrainedawayproperly.
Abadconnectionmaycausewaterleakage.
nKeeplevelevenwheninstallingthe
product.
Toavoidvibrationofwaterleakage.
nDonotinstall theproductwherethe
noise or hotair fromtheoutdoor unitcould
damagetheneighborhoods.
Itmay cause aproblem foryourneighbors.
nUsetwoor morepeopletoliftand
transporttheproduct.
Avoidpersonalinjury.
nDonotinstall theproductwhereit
will beexposedtoseawind(saltspray)directly.
Itmay cause corrosionontheproduct.
Corrosion,particularlyonthecondenserandevaporator
fins,couldcauseproductmalfunctionorinefficient
operation.
ØOperational
nDonotexposetheskindirectlyto
cool air for longperiodsoftime.(Donotsitin
thedraft).
Thiscouldharmtoyourhealth.
nDonotusetheproductfor special
purposes,suchaspreservingfoods,worksofart,
etc.Itisaconsumerair conditioner,nota
precisionrefrigerantsystem.
Thereisrisk ofdamageorlossofproperty.
nDonotblocktheinletor outletofair
flow. Itmay cause productfailure.
nUseasoftclothtoclean.Donotuse
harshdetergents,solvents,etc.
Thereisrisk offire,electricshock,ordamage
to theplasticpartsoftheproduct.
nDonottouchthemetalpartsof the
productwhenremovingtheair filter.Theyare
verysharp.
Thereisrisk ofpersonalinjury.
nDonotsteponprputanythingonthe
product.(outdoor units)
Thereisrisk ofpersonalinjuryandfailureof
product. nAlwaysinsertthefiltersecurely.
Cleanthefiltereverytwoweeksor moreoftenif
necessary.
Adirtyfilterreduces theefficiencyoftheair
conditionerandcouldcause productmalfunctionor
damage.nDonotinserthandsor otherobject
throughair inletor outletwhiletheproductis
operated.
Therearesharpandmovingpartsthatcould
causepersonalinjury.

3
nDonotdrinkthewaterdrainedfrom
theproduct.
Itisnotsanitarycouldcause serioushealth
issues. nUseafirmstool or ladderwhen
cleaningor maintainingtheproduct.
Becarefulandavoidpersonalinjury.
nReplacetheall batteriesinthe
remotecontrol withnewonesofthesametype.
Donotmixoldandmewbatteriesor different
typesofbatteries.
Thereisrisk offireor explosion.
nDonotrechargeor disassemblethe
batteries.Donotdisposeofbatteriesinafire.
They mayburnofexplode.
nIftheliquidfromthebatteriesgets
ontoyourskinor clothes,washitwell withclean
water.Donotusetheremoteofthebatteries
haveleaked.
Thechemicalinbatteries couldcause burns
or otherhealthhazards

4
2.Function
When thepowersupplyis
interruptedand thenrestore,theair
conditionersautomaticallyrestore
thepreviousfunctionsetting.
BLDC fanmotor
Maintaintheroomtemperat
ureinaccordancew
iththesettingtemperature.
The modecanbechangebytheroomtemperature.
Thelouvercanbeset atthedesiredpositionor
swingupanddownautomatically
Thefunction isusuallyusedinrainydaysin
springtimeordampareas.
Th
efan isturntolowspeed(cooling/heating).
Theunit will beturnoff attheseventhhour.
Theunit will decidethelouverdirectionaccordingto
operation mode.
Turbowind,high,med,low,breeze.
Restartingisforapprox. 3minutes..
Prevent thew
aterbeingfr
ozen
on evaporatorbysensing
theevaporatorpipetemperatureincoolingmode
Roomtemperaturesensor.
Pipetemperaturesensor.
Indoorunit
Operationbyremotecontroller
Sensingbyroomtemperature
Roomtemperaturecontrol
Anti-freezing control incooling
TimeDelaySafetycontrol
Indoorfanspeedcontrol
Two-directionairvane
Sleepmodeautocontrol
Independentdehumidification
AirflowDirection control
Automode
Temp.Compensation Flexiblewiringconnection
Autodefrost
Ionizer(Optional)
Anti-coldfunction
Self-diag.function
Auto-restartfunction
Prevent thecoldwindatthe
beginningof unitstart.

5
Itprotectsthevalvesand preventswater
fromdripping.
Theunit has3minsdelaybetweencontinuouslyON/OFF operations.
Outdoorunit
Powerrelaycontrol
Thehydrophilicfincan improvetheheatingefficiencyatoperation mode.
Hydrophilicaluminumfin
Itisonlyoperatedintheheatingoperation modeexcept defrosting operation.
Anti-rustcabinet
Valveprotectioncover
4wayvalvecontrol
Madefromelectrolyticzincsteelsheet and anti-rust coatedcomponents.
Lownoise airflowsystem
Birdtailpropellerfan makes
theoutdoorunitrun morequietly.
Dischargepipetemperatureprotect
EEV control
Lowambientheating
BLDC fanmotor

6
3.Dimension
3.1Indoor Unit
MSC-09HRFN1-QD2EMSC-12HRFN1-QD2E
Model W(mm) H(mm) D(mm)
MSC-09HRFN1-QD2E 790 265 195
MSC-12HRFN1-QD2E 920 292 225

7
3.2OutdoorUnit
MOC1-09HFN1-QD2E
MOF-12HFN1-QD2E