Midea MSX-07HRN1-QC2 User manual

XSEU-A-12
02
SERVICE MANUAL
MIDEA AIRCONDITIONER
EUROPE MARKET
SPLITWALL-MOUNTEDTYPE
XON-OFF SERIES

CONTENTS
1. Precaution..............................................................................................................................................1
1.1SafetyPrecaution..........................................................................................................................1
1.2Warning.........................................................................................................................................1
2. Function.................................................................................................................................................. 6
3. Dimension...............................................................................................................................................9
3.1IndoorUnits...................................................................................................................................9
3.2OutdoorUnits.............................................................................................................................. 11
4. RefrigerantCycleDiagram................................................................................................................... 12
5. WiringDiagram..................................................................................................................................... 13
5.1IndoorUnits.................................................................................................................................13
5.2OutdoorUnits..............................................................................................................................15
6. Installationdetails................................................................................................................................ 19
6.1Wrenchtorque sheet forinstallation ...........................................................................................19
6.2Connectingthe cables.................................................................................................................19
6.3Pipelengthand the elevation......................................................................................................20
6.4Installationforthe first time.........................................................................................................22
6.5Addingtherefrigerant afterrunningthe systemformanyyears.................................................25
6.6Re-installationwhilethe indoorunit need toberepaired............................................................26
6.7Re-installationwhilethe outdoorunit needtoberepaired .........................................................28
7. Operation characteristics .................................................................................................................... 31
8. Electronicfunction............................................................................................................................... 32
8.1Abbreviation.................................................................................................................................32
8.2Displayfunction...........................................................................................................................32
8.3MainProtection...........................................................................................................................34
9.Troubleshooting................................................................................................................................... 47
9.1Indoorunit errordisplay..............................................................................................................47
9.2Diagnosisand Solution...............................................................................................................48

1
1. Precaution
1.1SafetyPrecaution
nTopreventinjurytotheuserorotherpeopleand propertydamage, thefollowing
instructionsmustbefollowed.
nIncorrectoperation duetoignoring instruction will causeharmordamage.
nBeforeservice unit, besuretoreadthisservicemanual atfirst.
1.2Warning
ØInstallation
nDonotuse adefectiveorunderratedcircuitbreaker. Use thisapplianceon adedicated
circuit.
Thereisrisk offireorelectricshock.
nForelectrical work, contactthedealer, seller, aqualifiedelectrician, oranAuthorized
service center.
Donot disassembleorrepairthe product, thereisrisk offireorelectricshock.
nAlways ground theproduct.
Thereisrisk offireorelectricshock.
nInstall thepanel and thecoverofcontrol boxsecurely.
Thereisrisk offireofelectricshock.
nAlways install adedicatedcircuitand breaker.
Improperwiringorinstallation maycauseforeorelectricshock.
nUse thecorrectlyratedbreakeroffuse.
Thereisrisk offireorelectricshock.
nDonotmodifyorextend thepowercable.
Thereisrisk offireorelectricshock.
nDonotinstall, remove, orreinstall theunitbyyourself(customer).
Thereisrisk offire, electricshock, explosion, orinjury.
nBecaution whenunpacking and installing theproduct.
Sharpedgescouldcauseinjury, beespeciallycarefulofthe caseedgesand the finson the

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condenserandevaporator.
nForinstallation, always contactthedealeroranAuthorizedservice center.
Thereisrisk offire, electricshock, explosion, orinjury.
nDonotinstall theproducton adefectiveinstallation stand.
It maycauseinjury, accident, ordamagetothe product.
nBesuretheinstallation area doesnotdeterioratewithage.
Ifthe basecollapses, the airconditionercouldfall withit, causingpropertydamage, product failure,
and personalinjury.
nDonotlettheairconditionerrun foralong timewhenthehumidityisveryhigh and a
doororawindowisleftopen.
Moisturemaycondenseandwet ordamagefurniture.
nTake caretoensurethatpowercablecouldnotbepulledoutordamagedduring
operation.
Thereisrisk offireorelectricshock.
nDonotplace anything on thepowercable.
Thereisrisk offireorelectricshock.
nDonotplug orunplug thepowersupplyplug during operation.
Thereisrisk offireorelectricshock.
nDonottouch(operation)theproductwithwethands.
Thereisrisk offireorelectricshock.
nDonotplace aheaterorotherappliance nearthepowercable.
Thereisrisk offireand electricshock.
nDonotallowwatertorunintoelectricparts.
It maycausefire, failureofthe product, orelectricshock.
nDonotstoreoruse flammablegas orcombustibleneartheproduct.
Thereisrisk offireorfailureofproduct.
nDonotuse theproductinatightlyclosedspace foralong time.
Oxygen deficiencycouldoccur.
nWhenflammablegas leaks, turnoff thegas and openawindowforventilation before
turntheproducton.
Donot usethetelephone orturnswitcheson oroff.

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Thereisrisk ofexplosion orfire.
nIfstrangesounds, orsmall orsmoke comes fromproduct. Turnthebreakeroff or
disconnectthepowersupplycable.
Thereisrisk ofelectricshock orfire.
nStop operation and close thewindowinstormorhurricane. Ifpossible, removethe
productfromthewindowbeforethehurricanearrives.
Thereisrisk ofpropertydamage, failureofproduct, orelectricshock.
nDonotopentheinletgrill oftheproductduringoperation.(Donottouchtheelectrostatic
filter, iftheunitissoequipped.)
Thereisrisk ofphysicalinjury, electricshock, orproduct failure.
nWhentheproductissoaked(floodedorsubmerged), contactanAuthorizedservice
center.
Thereisrisk offireorelectricshock.
nBecaution thatwatercouldnotentertheproduct.
Thereisrisk offire, electricshock, orproduct damage.
nVentilatetheproductfromtimetotimewhenoperating ittogetherwithastove, etc.
Thereisrisk offireorelectricshock.
nTurnthemainpoweroff whencleaning ormaintaining theproduct.
Thereisrisk ofelectricshock.
nWhentheproductisnotbeusedforalong time, disconnectthepowersupplyplug or
turnoff thebreaker.
Thereisrisk ofproduct damageorfailure, orunintended operation.
nTake caretoensurethatnobodycouldstepon orfall ontotheoutdoorunit.
Thiscouldresult inpersonalinjuryandproduct damage.
ØCAUTION
nAlways check forgas (refrigerant) leakageafterinstallation orrepairofproduct.
Lowrefrigerant levelsmaycausefailureofproduct.
nInstall thedrainhose toensurethatwaterisdrainedaway properly.
Abad connectionmaycausewaterleakage.
nKeeplevel evenwheninstalling theproduct.

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It can avoidvibration ofwaterleakage.
nDonotinstall theproductwherethenoise orhotairfromtheoutdoorunitcoulddamage
theneighborhoods.
It maycauseaproblemforyourneighbors.
nUse twoormorepeopletoliftand transporttheproduct.
Avoidpersonalinjury.
nDonotinstall theproductwhereitwill beexposedtosea wind (saltspray)directly.
It maycausecorrosion on theproduct. Corrosion, particularlyon thecondenserand evaporatorfins,
couldcauseproduct malfunction orinefficient operation.
ØOperational
nDonotexpose theskindirectlytocool airforlong periodsoftime. (Donotsitinthe
draft).
Thiscouldharmtoyourhealth.
nDonotuse theproductforspecialpurposes, suchas preserving foods,works ofart,etc.
Itisaconsumerairconditioner, notaprecision refrigerantsystem.
Thereisrisk ofdamageorloss ofproperty.
nDonotblock theinletoroutletofairflow.
It maycauseproduct failure.
nUse asoftclothtoclean. Donotuse harshdetergents, solvents, etc.
Thereisrisk offire, electricshock, ordamagetothe plasticpartsofthe product.
nDonottouchthemetal partsoftheproductwhenremoving theairfilter. They arevery
sharp.
Thereisrisk ofpersonalinjury.
nDonotstepon orputanything on theproduct. (outdoorunits)
Thereisrisk ofpersonalinjuryandfailureofproduct.
nAlways insertthefiltersecurely. Cleanthefiltereverytwoweeks ormoreoftenif
necessary.
Adirtyfilterreducesthe efficiencyoftheairconditionerand couldcauseproduct malfunction or
damage.
nDonotinserthandsorotherobjectthroughairinletoroutletwhiletheproductis

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operated.
Therearesharpandmovingpartsthat couldcausepersonalinjury.
nDonotdrinkthewaterdrainedfromtheproduct.
It isnot sanitarycouldcauseserioushealthissues.
nUse afirmstool orladderwhencleaning ormaintaining theproduct.
Becarefuland avoidpersonalinjury.
nReplace theall batteries intheremotecontrolwithnewones ofthesametype. Donot
mixoldand mewbatteries ordifferenttypes ofbatteries.
Thereisrisk offireorexplosion.
nDonotrechargeordisassemblethebatteries. Donotdispose ofbatteries inafire.
Theymayburnofexplode.
nIftheliquidfromthebatteries getsontoyourskinorclothes, washitwell withclean
water. Donotuse theremoteofthebatteries haveleaked.
Thechemicalinbatteriescouldcauseburnsorotherhealthhazards
Thedesigns, andinformation inthisbookaresubject tochangewithout noticeforproduct improvement.

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2. Function
Model Names ofIndoor/OutdoorUnits
Series Capacity Indoorunits Outdoorunits
On-Off
7k MSX-07HRN1-QC2 MOA-07HN1-QC2
9k MSX-09HRN1-QC2 MOA-09HN1-QC2
MSX-09HRN1-QC2 MOA1-09HN1-QC2
12k MSX-12HRN1-QC2 MOB1-12HN1-QC2
MSX-12HRN1-QC2 MOB-12HN1-QC2
18k MSX-18HRN1-QC2 MOF-18HN1-QC2
21k MSX-21HRN1-QB8W MOF1-21HN1-QB8W
24k MSX-24HRN1-QB8W MOF3-24HN1-QB8W

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Thelouvercan beset atthe desired position
orswingupand downautomatically
Thefunction isusuallyusedinrainy
daysinspringtimeordampareas.
Theunit wil
ldecide the louverdirection according
tooperation mode.
Turbowind, high,med,low,breeze.
Prevent the waterbeingfr
ozen
on evaporatorby
checkingthe evaporatorpipetemperature
Indoorunits
Operation byremotecontroller.
Anti-freezing control incooling
TimeDelay Safetycontrol
Indoorfanspeedcontrol
Two-directionairvane
Sleepmodeautocontrol
Independentdehumidification
AirflowDirection
Automode
Temp. Compensation
Flexiblewiring connection
Autodefrost
Anti-coldfunction
Self-diag. function
Auto-restart
Ionizer/Plasma(optional)
Preventthecoldwind atthe
beginningofunit start.
Followme
Goldenfin(Optional)
LCD display

8
It protectsthevalvesand preventswaterfromdr
ipping.
Outdoorunits
Powerrelay control
Valveprotection cover
Made fromelectrolyticzincsteelsheetandanti
-
rust coated components.
Lownoise airflowsystem
Anti-rustcabinet

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3. Dimension
3.1IndoorUnits
Figure1:
Figure2:

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Figure3:
Figure4:
Figure Models W D H
Figure1 MSX-07HRN1-QC2 710 195 250
MSX-09HRN1-QC2
Figure2 MSX-12HRN1-QC2 790 195 265
Figure3 MSX-18HRN1-QC2 850 225 305
Figure4 MSX-21HRN1-QB8W 998 235 322
MSX-24HRN1-QB8W

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3.2OutdoorUnits
Morethan30cm
Morethan60cm
Morethan70cm
Morethan30cm
Morethan60cm
(Servicespace
Fenceor
obstacles
Model W D H W1 A B
MOA-07HN1-QC2 700 240 540 757 458 250MOA1-09HN1-QC2
MOA-09HN1-QC2
MOB1-12HN1-QC2 780 250 540 843 549 276
MOB-12HN1-QC2
MOF-18HN1-QC2 845 320 700 908 560 335MOF1-21HN1-QB8W
MOF3-24HN1-QB8W

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4. RefrigerantCycleDiagram
Forheatpumpmodels:
INDOOR
OUTDOOR
LIQUIDSIDE
GAS SIDE
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
COMPRESSOR
2-WAYVALVE
3-WAY VALVE
CHECK VALVE
(HeatingModel only)
CAPILIARY TUBE
REVERSING VALVE
(HeatingModelonly)
COOLING
HEATING
ACCUMULATOR

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5. Wiring Diagram
5.1IndoorUnits
MSX-07HRN1-QC2MSX-09HRN1-QC2MSX-12HRN1-QC2MSX-18HRN1-QC2

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MSX-21HRN1-QB8W,MSX-24HRN1-QB8W

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5.2OutdoorUnits
MOA-07HN1-QC2

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MOA1-09HN1-QC2MOA-09HN1-QC2MOB1-12HN1-QC2MOB-12HN1-QC2

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MOF-18HN1-QC2

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MOF1-21HN1-QB8W
MOF3-24HN1-QB8W