ductless multi-split heat pump · 2019-07-12 · connected to the pcb via plugs cn-12(hp) and...

Ductless Multi-Split Heat Pump

Service Manual

Design may vary by model number.• Please read this manual before using the heat pump.•Keep this user manual for future reference.

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Table of Contents

2U20EH2VHA3U24EH2VHA

Safety & Precautions ........................................................................................................................... 3Controls & DIP Switch Settings ........................................................................................................... 5Sequence of Operation & Operational Parameters ............................................................................. 13Error Codes & Troubleshooting ......................................................................................................... 27Reference Information ...................................................................................................................... 44

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SAFETY & PRECAUTIONS PAGE 3

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Safety & Precautions

•ReadtheseSafetyPrecautionscarefullytoensurecorrectinstallation.•ThismanualclassifiestheprecautionsbyWARNINGandCAUTION.•Followallprecautionsbelow.Theyareallimportantforensuringsafetyandpreventingproperty/equipmentdamage.

! WARNING: FailuretofollowanyofWARNING islikelytoresultingraveconsequencessuchasdeathorseriousinjury.

! CAUTION: FailuretofollowanyofCAUTION may,insomecases,resultingraveconsequences.

•Thefollowingsafetysymbolsareusedthroughoutthismanual:

Observethisinstruction Establish an earth connection Neverattempt

•Aftercompletinginstallation,testtheunittocheckforinstallationerrors.GivetheuseradequateinstructionsconcerningtheuseandcleaningoftheunitaccordingtotheOperationManual.

! WARNING

•Installationshouldbeperformedbythedealeroranotherprofessional.Improperinstallationmaycausewaterleakage,electricalshock,orfire.

•Installtheheatpumpaccordingtotheinstructionsgiveninthismanual.Incompleteinstallationmaycausewaterleakage,electricalshock,orfire.

•Useonlythesuppliedorspecifiedinstallationparts.Useofotherpartsmaycausetheunittocomelose,waterleakage,electricalshock,orfire.

•Installtheheatpumponasolidbasethatcansupporttheunit’sweight.Aninadequatebaseorincompleteinstallationmaycauseinjuryintheeventtheunitfallsoffthebase.

•Electricalworkshouldbecarriedoutinaccordancewiththeinstallationmanualandnational/localelectricalwiringcodesandrules of practice.Insufficientcapacityorincompleteelectricalworkmaycauseelectricalshockorfire.

•Useadedicatedpowercircuit.Neveruseapowersupplysharedbyanotherappliance.•Forwiring,useacablelongenoughtocovertheentiredistancewithnosplices.Donotuseanextensioncord.Donotputotherloadsonthepowersupply,useadedicatedpowercircuit.(Failuretodosomaycauseabnormalheat,electricshockorfire.)

•Useonlythespecifiedwiretypesforelectricalconnectionsbetweentheindoorandoutdoorunits.Firmlyclamptheinterconnectingwiressotheyreceivenoexternalstresses.Incompleteconnectionsorclampingmaycauseterminalover-heatingorfire.

•Aftercompletinginterconnectingandsupplywiringconnections,shapethecablessothattheydonotputundueforceontheelectrical covers or panels.Installcoversoverthewires.Incompletecoverinstallationmaycauseterminaloverheating,electricalshock,orfire.

•Ifanyrefrigeranthasleakedoutduringtheinstallationwork,ventilatetheroom.(Therefrigerantproducesatoxicgasifexposedtoflame.)

•Afterallinstallationiscomplete,checkforandrepairanysystemrefrigerantleaks.(Therefrigerantproducesatoxicgasifexposedtoflames.)

•Wheninstallingorrelocatingthesystem,keeptherefrigerantcircuitfreefromsubstancesotherthanthespecifiedrefrigerant(R410A),suchasair.(Thepresenceofairorotherforeignsubstanceintherefrigerantcircuitcausesanabnormalpressureriseorrupture,resultingininjury.)

•Duringpump-down,stopthecompressorbeforeremovingtherefrigerantpiping.Ifthecompressorisstillrunning,andthestopvalveisopenduringpump-down,airwillbesuckedintothesystemwhilethecompressorisrunning.Thiswillcauseabnormalpressureandnoncondensablesaddedtothesystem.

•Besuretoestablishaground.Donotgroundtheunittoautilitypipe,arrester,ortelephoneearth.Ancompleteearthmaycauseelectricalshock,orfire.Ahighsurgecurrentfromlightningorothersourcesmaycause damage to the heat pumpheat pump.

! CAUTION

•Donotinstalltheheatpumpinaplacewherethereisdangerofexposuretoflammablegas.Ifthegasbuildsuparoundtheunit,itmaycatchfire.

•Installdrainpipingaccordingtotheinstructionsofthismanual.Inadequatepipingmaycauseflooding.

•Tightentheflarenutaccordingtothespecifiedtorqueusingatorquewrench.Iftheflarenutisovertightened,theflarenutmayeventuallycrackandcauserefrigerantleakage.

•Provideadequatemeasurestopreventtheoutdoorunitfrombeingusedasashelterbyrodents.Rodentsmakingcontactwithelectricalpartscancausemalfunctions,smokeorfire.Pleaseinstructthecustomertokeeptheareaaroundthe unit clean.

CONTROLS & DIP SWITCH SETTINGS PAGE 5

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Controls & DIP Switch Settings

Outdoor Unit Introduction ................................................................................................................................................. 6Service Monitor Board (SMB) Overview .............................................................................................................................. 6Inverter Power Module Board (IPM) Overview ..................................................................................................................... 6PCB Overview .................................................................................................................................................................... 7Power Filter Board (PFB) Overview ..................................................................................................................................... 8PCB 0151800075M DIP Switch Settings ............................................................................................................................. 9 SW5 DIP Switch Settings.................................................................................................................................................................9 SW6 DIP Switch Settings.............................................................................................................................................................. 10 SW7 DIP Switch Settings.............................................................................................................................................................. 10PCB 015180076A DIP Switch Settings .............................................................................................................................. 11 SW1 DIP Switch Settings.............................................................................................................................................................. 11

Table of Contents

CONTROLS & DIP SWITCH SETTINGSPAGE 6

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Outdoor Unit Introduction

Theoutdoorunitfeaturesavariablespeed,rotarytypecompressorthatdeliversrefrigerantflowtoupto4individualindoorunits.ThesystemusesR-410ArefrigerantmixedwithPVEoil,andis208/230VAC,60Hz,singlephase.

CompatibleindoorunitsareHighwall,Cassette,andDuctedwithremotecontrol,cassettewitheitherremoteorwiredcontrol,andductedwithwiredcontrolonly.

Theindoorunitswillmaintainindividualizedroomtemperaturesassetoneachcontroller,providedallunitsareinthesamemode.Ifthefirstunittobeturnedonissettotheheatingmode,allunitswillheat.Ifthefirstunittobeturnedonissettothecoolingmode,allunitswillcool.

Service Monitor Board (SMB) Overview

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1 TheSMBisconnectedtothePCBviaconnectionsCN-2andCN-3.

TheSW1DIPswitchesareOFF(defaultpositionfornormaloperation).

Thedigitaldisplaywillindicateoperatingfrequencyofthecompressorwhennoerrorcodeispresent,orwillflashanerrorcodeifpresent.

AsolidgreenLEDindicatesthattheA,B,C,DorEunitissuccessfullycommunicatingwiththeoutdoorunit.

TheSMBhasimportantfeaturesincludingoperationalDIPswitches,errorcodedisplay,compressorspeed,anddiagnosticcapabilities.

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Inverter Power Module (IPM) Overview

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1 TheInverterPowerModulegenerates3-phaseVDCpowertooperatethevariablespeedcompressor.ThecompressorisconnectedtotheIPMviaterminalsU,VandW.

AReactorCoilisconnectedtotheIPMatterminalsRIandRO.TheReactorCoilwillfilterelectricalnoisegeneratedathighfrequencyoperationthatcouldcausedamagetothecompressorwindings.

IPMgeneratesalargeamountofheatduringoperation.Thisheatistransferedtoaheatsinkbehindtheboard,thenmixedwiththeoutdoorair.TheTmtemperaturesensorprotectstheIPMfromexcessivetemperatures.

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PCB Overview

VoltagetooperatethePCBisprovidedbythePowerFilterBoardonterminalsACNandACL. Whenpowerispresent,theGreenLEDwilllight.

ThecommunicationcablestothePCBfromthePowerFilterBoardconnecttoCN6andCN34. TheServiceMonitorBoardconnectstoplugsCN-23andCN-8.Whenthesecables are connected to the Service MonitorBoard,theSMBdigitaldisplayshould be illuminated.

PlugCN-21connectsthedatapathbetweeneachindoorunitandthePCB.TheconnectionsfromthisplugterminateattheNumber3/Cterminalattheindoorunitvoltageconnectionterminalstrips.

TheOutdoorFanMotorisaDCvoltage,variablespeedtypethatconnectstothePCBatterminalPlugCN-11.

The4-WayValveisenergizedbylinevoltagefromaconnectionviaPlugCN-5.ThisvalveisenergizedinHEATMODE.

TheCrankcaseHeaterisenergizedviaaconnectionatterminalsCON-9andCON-8onthePCB.

TheEEVcoilsfortheoutdoorunitandeachindoorunitareconnectedatterminalsCN-15throughCN-18.TheseEEVcoilsincludetheconnectionfortheHEATMODEEEVcoil.

Thereareasetoftemperaturesensorsthatmonitorthetemperatureoftherefrigerantenteringandleavingeachcircuit.Thesesensorsaremountedinagroupnearthecenterofthecircuitboard.

Therearesystemtemperaturesensorsthatmonitorrefrigerantlinetemperatureandoutdoorairtemperatures.ThesesensorsplugintothePCBviaPlugsCN-14,CN-1,CN-7,andCN-24.

Thesystemhastworefrigerantpressureswitches,aLowPressureSwitchandaHighPressureSwitch.TheseswitchesareconnectedtothePCBviaPlugsCN-12(HP)andCN-13(LP).

TherearethreesetsofDIPswitches.SW5andSW7affecttheoperationalparametersoftheunit.Refertothewiringdiagramforthecorrectsettings.SW6positionsarechangedonlywhenaCentralControllerisused.

Thereare4surfacemountedbuttonslocatednexttoSW-5andSW-6.Thesebuttonsareforfactoryuseonly.

ThePCBhasaGreenLEDandaRedLED.Whenpowerispresent,theRedLEDison.Whentwoorthreeindoorunitsareconnected,theGreenLEDison.

T5A250VratedceramicfuseislocatedonthePCB.Thisfusewillopenifexcessivecurrentoccursorifapowersurgeispresent.Thisfuseisfieldreplaceable.

Basepanheaterconnection(150W).

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ThePCBisconnectedviacommunicationcablestotheInverterPowerModule,FilterBoard,andtheServiceMonitorBoard.

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Power Filter Board (PFB) Overview

Areplaceable,30A,250Vratedceramicfuseprotectstheoutdoorunitelectronics.Thefusewillopenifapowersurgeorinternal short in the outdoor unit has occurred.

ThePFBreceiveslinevoltageatterminalsP1andP2fromtheoutdoorunithighvoltageterminalblock1/Nand2/L.

ThevoltagethatpowerstheindoorunitsconnectstoterminalsP3andP4.

ThePCBreceivespowertooperateviaconnectionsatterminalsP5andP6.

TheIPMreceivespowerviaconnectionsatterminalsP7andterminal3.

ThereisacommunicationpluglabeledCN-1onthePFB.ThisplugconnectsfromthePFBtothePCB.Ifthiscableisdisconnectedorloose,thesystemwillgenerateaCode6moduleloworhighvoltageerror.Thiserrorwillnotbedisplayedinmemoryontheindoorunitwiredcontroller.CN-1andCN-2connecttothePCBatterminalsCN-6andCN-34.CN-6isthelowstand-bypowerconnection.Whenpowerhasbeenturnedoffatthecontrollerfor5minutes,CN-6willremovethe12VDCsignalandopenrelayRL-1onthePFB.ThissavesenergybyshuttingoffpowertotheIPM.Thecapacitorsmusthavecurrentflowbeforethecompressorcanstart.CN-34isthecapacitorchargingcircuit.Whenthecapacitorsarefullycharged,thecircuitopenstostopthechargingprocessviatheRL-2relay.ThevoltagebetweenthetwopinsofCN-1andthetwopinsofCN-2is12VDC.

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ThepurposeofthePFBistofilteroutpotentialelectricalnoisebeforeitreachestheoutdoorunitelectroniccircuits.AllvoltagetooperatetheoutdoorunitcircuitsmustpassthroughthePFB.

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PCB 0151800075M DIP Switch Settings

Description SW5-1 SW5-2 SW5-3 SW5-4 SW5-5 SW5-6 SW5-7 SW5-8

Heatpump OFF* ---- ---- ---- ---- ---- ---- ----

Coolingonly ON ---- ---- ---- ---- ---- ---- ----

Defrosttemp.selection(usedformildweatherdefrost)

---- OFF* ---- ---- ---- ---- ---- ----

Defrosttemp.selection(usedforsevereweatherdefrost)

---- ON ---- ---- ---- ---- ---- ----

Powerinputrestrictinvalid ---- ---- OFF* ---- ---- ---- ---- ----

Powerinputrestrictvalid ---- ---- ON ---- ---- ---- ---- ----

2U20EH2VHA ---- ---- ---- OFF ON ON ---- ----

3U24EH2VHA ---- ---- ---- ON ON OFF ---- ----

Factoryuseonly ---- ---- ---- ---- ---- ---- OFF* ----

Factoryuseonly ---- ---- ---- ---- ---- ---- ON ----

Quiet operation valid ---- ---- ---- ---- ---- ---- ---- OFF*

Quiet operation invalid ---- ---- ---- ---- ---- ---- ---- ON

Note:1.Powerinputrestrictselection:OFF-invalid;ON-valid(≤3500W)2.Quiet operation:IfOFF,theoutdoorunitwillcalculateandobtaintheaverageambienttemperatureoftheunitwithinthelast24hours,Tao_average_24.ThencomparethecurrentambienttemperaturewiththeambienttemperatureaverageTao_average_24,andcombineitwiththepreviousambienttemperaturetrendtodeterminewhetheritcanenterQuiet operation (lowcompressorspeedandlowO.D.fanspeed).

SW5 SW7SW6

SW5 DIP Switch Settings

*FactoryDefaultSetting


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PCB 0151800075M DIP Switch Settings

OutdoorCentralControlAddress

SW6-1 SW6-2 SW6-3 SW6-4

0 OFF OFF OFF OFF

1 OFF OFF OFF ON

2 OFF OFF ON OFF

3 OFF OFF ON ON

4 OFF ON OFF OFF

5 OFF ON OFF ON

6 OFF ON ON OFF

7 OFF ON ON ON

8 ON OFF OFF OFF

9 ON OFF OFF ON

10 ON OFF ON OFF

11 ON OFF ON ON

12 ON ON OFF OFF

13 ON ON OFF ON

14 ON ON ON OFF

15 ON ON ON ON

Outdoorcentralcontroladdresssettings

Description SW7-1 SW7-2 SW7-3 SW7-4 SW7-5 SW7-6 SW7-7 SW7-8

USAenergyefficiencytestmodeforHighWallunit OFF* OFF* ---- ---- ---- ---- ---- ----

USAenergyefficiencytestmodeforDuctunit ON OFF ---- ---- ---- ---- ---- ----

Reserved ---- OFF* ---- ---- ---- ---- ----

Reserved ---- ---- ---- OFF* ---- ---- ---- ----

Reserved ---- ---- ---- ---- OFF* ---- ---- ----

Reserved ---- ---- ---- ---- ---- OFF* ---- ----

NorthAmericanregion ---- ---- ---- ---- ---- ---- ON* ----

Non-NorthAmericanregion ---- ---- ---- ---- ---- ---- OFF ----

Quiet operation valid ---- ---- ---- ---- ---- ---- ---- OFF*



*FactoryDefaultSetting


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PCB 015180076A DIP Switch Settings

Definition SW1-1 SW1-2 SW1-3 SW1-4

Factorydefault OFF OFF OFF OFF

Forcedheating ON OFF OFF OFF

Forcedcooling OFF ON OFF OFF

Ratedoperation OFF OFF ON OFF

Timedefrostvalid:Defrostinitiatesifneededwhenthecompressorhasbeenonfor10minutescontinuouslyand50minutescumulative.Termination

conditions are the same as demand defrost.OFF OFF OFF ON

Wiringcheckactive ON ON ON ON


SEQUENCE OF OPERATION & OPERATIONAL PARAMETERS PAGE 13

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Sequence of Operation & Operational Parameters

Cooling Mode Sequence of Operation ............................................................................................................................... 14Heating Mode Sequence of Operation .............................................................................................................................. 16Defrost Cycle Sequence of Operation ............................................................................................................................... 18Operating Parameters ...................................................................................................................................................... 19 Electronic Expansion Valve (EEV) Control .................................................................................................................................... 19 4-Way Valve Heating Control ....................................................................................................................................................... 19 Compressor Sump Heater ............................................................................................................................................................ 19 Defrost Control ............................................................................................................................................................................. 20 Base Pan Heater Control Logic ..................................................................................................................................................... 20 Discharge Sensor Protection ........................................................................................................................................................ 21 High Current Protection ............................................................................................................................................................... 21 High Pressure Protection ............................................................................................................................................................. 22 Low Pressure Protection .............................................................................................................................................................. 23 Oil Return Cycle ............................................................................................................................................................................. 24

Table of Contents

SEQUENCE OF OPERATION & OPERATIONAL PARAMETERSPAGE 14

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Cooling Mode Sequence of Operation

Onacallforcooling,theindoorunitwillsendtheroomtemperatureandset-pointrequirementtotheoutdoorunitPCBviathedatasignalwirepath.Thedatatravelsfromtheindoorunittotheoutdoorunitviathewirelocatedonterminal3/C.Theindoorlouverswillopenandtheindoorfanmotorwillstart.

TheoutdoorunitwillenergizetheEEVsthatarecontrollingrefrigerantflowtothecallingindoorunits.ThepositionoftheEEVswillbesettoaninitialpositionbasedupontheoutdoorairtemperature.

The4-wayvalveisde-energized.Aftera3-minutetimedelay,theoutdoorfanmotorwillbeenergized.Shortlyaftertheoutdoorfanmotorturnson,thecompressorwillstartinlowfrequency.TheoperatingfrequencyofthecompressorwillbedisplayedontheServiceMonitorBoard.

Therefrigerantinthesystemwillbegintoflow,andthecompressorwilldischargehotgasintotheoilseparator.Oilwillbetrappedintheseparatorandreturnedtothesuctioninletofthecompressorviathecapillarytubeassemblylowpressurepath.

Comp-ressor

Discharge temp.●

sensor

Oilseparator Capillary tube

Ø2.7*Ø1.0*1400

High pressure switch

4-way valve Pipe sensor Toci

Suction temp.sensor Ts

Low pressure switch

Accumulator

Gas service valve

Outdoor heat

exchanger temp. sensor

FAN-OUT

Outdoor ambient temperature sensor Ta

Defrost sensor Td

Distributor

Strainer

EEV O

Receiver

Liquid service valve

5/8

3/8

Unit A liquid pipe temp. sensor Tc2 Strainer EEV AIndoor unit A

Unit B liquid pipe temp. sensorTc2 Strainer EEV BIndoor unit B

Unit C liquid pipe temp. sensor Tc2 Strainer EEV CIndoor unit C

Unit A gas pipe temp. sensor Tc1

Unit B gas pipe temp. sensor Tc1

Unit C gas pipe temp. sensor Tc1

Indoor unit A

Indoor unit B

Indoor unit C

4-way valve coil:OFFON

Refrigerant flow in coolingRefrigerant flow in heating

FAN-IN

Indoor ambient temperature sensor

Indoor heat


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Cooling Mode Sequence of Operation

1 Temperature Sensor Td

ThetemperatureofthecompressordischargehotgaswillbemonitoredbytheDischargeTemperatureSensor.Ifthesen-sorreadstoohotorcool,thefrequency/statusoftheopera-tionwillbeadjustedaccordingly.

Thehotgaswillleavetheoilseparatorandenterthe4-wayvalve,whichdirectsthehotgastotheoutdoorcoil.Therefrig-erantwillcondenseintheoutdoorcoilandbesubcooled.Therefrigerantisnowinaliquidstate.

2 Temperature Sensor Toci

Thetemperatureofthehotgasleavingthe4-wayvalvewillbemonitoredbytheTociTemperatureSensor.Thistemperatureshould be near the temperature of the compressor discharge gastemperature.Ifitisnot,thereisaproblemwiththe4-wayvalve.ThePCBwilldetectthetemperaturedifferenceandgenerateanErrorCode.

3 Temperature Sensor Tc

Thissensormonitorsthetemperatureoftheoutdoorcoilduringcondensingoperation.Ifabnormalcondensingtem-peratureisdetected,theoutdoorfanmotorspeedorcom-pressorfrequencymaybeadjusted.

4 Temperature Sensor Ta

TheoutdoorairtemperaturewillbemonitoredbythePCB.Iftheoutdoorairtemperaturerisesorfalls,thespeedoftheoutdoorfanmaybechanged.

5 Temperature Sensor Tc2

TheLiquidPipeSensorwillmonitorthetemperatureoftherefrigerantleavingtheEEV.

Thelowpressurelowtemperaturerefrigerantwillenterthemixedphaseliquidlineandtraveltotheindoorunit.Heatfromtheindoorairpassingacrosstheevaporatorcoilwilltransfertothecoldrefrigerant,sendingcoolairintothespaceandchangingtheliquidrefrigerantintoacoolvapor.Thecoldvaporwilltraveldownthevaporlineandreturntotheoutdoor unit via a path through the gas stop valve.


TheGasPipeSensorwillmonitorthetemperatureofthegaspipetocalculatethedifferencebetweenLiquidPipeTem-peratureandGasPipeTemperature.IfachangeinEEVportopeningsizeisneeded,theEEVwillmakeasmalladjustment.

Thevaporizedrefrigerantentersthe4-wayvalveandtravelstothevaporlineaccumulator.Theaccumulatorwilltrapanyliquidrefrigerantifpresenttopreventitfromenteringthecompressor.

Thevaporwillexittheaccumulatorandenterthecompressor.Thiscyclewillrepeatuntilthedemandforcoolingends.

7 Temperature Sensor Ts

Thetemperatureofthesuctiongasenteringthecompres-sorismonitoredbytheSuctionTemperatureSensor.Beforestoppingoperation,theEEVmayopentofeedmorerefriger-antorclosetowarmuptheline.

Thedemandbecomeslessastheindoortemperaturedropstowardthedesiredtemperature,sothecompressorwillreducespeed.Whenthesettemperatureisreached,thecompressorandoutdoorfanwillshutoff.Thecirculatingfan of each indoor unit continues to run.


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Comp-ressor

Discharge temp.●

sensor


Ø2.7*Ø1.0*1400




Low pressure switch

Accumulator

Gas service valve

Outdoor heat


FAN-OUT


Defrost sensor Td

Distributor

Strainer

EEV O

Receiver


5/8

3/8







Indoor unit A

Indoor unit B

Indoor unit C



FAN-IN


Indoor heat


Heating Mode Sequence of Operation

Onacallforheating,theindoorunitwillsendtheroomtemperatureandset-pointrequirementtotheoutdoorunitPCBviathedatasignalwirepath.Thedatatravelsfromtheindoorunittotheoutdoorunitviathewirelocatedonterminal3/C.Theindoorunitlouverswillopen.Thefanwillnotstartuntilthecoilhaswarmedsufficientlytoavoidcolddrafts.

EEVsservingindoorcircuitswillsteptothestandardopening.TheoutdoorEEVopenstoapositionbasedupontheoutdoorairtemperature.

The4-wayvalvewillenergizeandtheoutdoorfanwillstart.Thecompressorstartsataslowspeedandwillincreasebasedupondemand.Theindoorfanstartsaftertheindoorcoiliswarmenoughtoavoidcirculatingcoolair.

Withthecompressoroperating,refrigerantwillbegintoflowthroughouttherefrigerationcircuit.

TheoperatingfrequencyofthecompressorwillbedisplayedontheServiceMonitorBoard.

Whenthecompressorstarts,hotgaswillflowintotheoilseparator.Oilwillbetrappedintheseparatorandreturnedtothesuctioninletofthecompressorviathecapillarytubeassemblylowpressurepath.

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1 Temperature Sensor Td

ThetemperatureofthecompressordischargehotgaswillbemonitoredbytheDischargeTemperatureSensor.Ifthesensorreadstoohotorcool,thefrequency/statusoftheoperationwillbeadjustedasneeded.

Thehotgaswillleavetheoilseparatorandenterthe4-wayvalve.The4-wayvalvewilldirectthehotgastoALLoftheindoor coils.

Note: Any indoor unit that is in heating mode will have it’s louver open and indoor fan running. Non-calling indoor units will receive hot gas but their fans will remain on very low speed with the louver open. When demand for heat increases, the indoor fan will speed up to meet the increased demand.

2 Temp. Sensor Tc1 & Indoor Heat Exchanger Temp. Sensor

ThetemperatureofTc1shouldnowbehot.Thiswillindicatethe4-wayvalveisdirectinghotgastotheindoorcoils.Ifitisnot,thereisaproblemwiththe4-wayvalve.ThePCBwillde-tectthetemperaturedifferenceandgenerateanErrorCode.

Theindoorheatexchangertemperaturesensorwillmonitorthe temperature of the indoor coil to ensure it is hot enoughtopreventblowingcoldair.Onceadequatelywarmtemperatureissensedattheindoorcoil,thePCBwillincreasethe fan speed if needed to meet the demand.

Thehotgasenteringtheindoorcoilwillcondenseintoasaturatedmixandthenbesubcooled.Therefrigerantwillreturntotheoutdoorunitviatheliquidline.


Thissensormonitorsthetemperatureoftherefrigerantliquidreturningfromtheindoorcoil.TheindoorEEVopeningangleisfixed.

TheliquidwillentertheLiquidLineStrainerandwillpassthroughtheOPENEEV.

Therefrigerantliquidnowentersareceiverwhereexcessrefrigerantwillstore.

AftertheliquidleavestheLiquidReceiver,itwillentertherestrictionoftheOUTDOORUNIT’sEEV,whichchangestheliquidrefrigeranttoalowerpressureandtemperatureasitenters the outdoor coil.

Astheoutdoorcoilabsorbsheatfromthesurroundingair,theverycoldliquidrefrigerantischangedtoacoolvapor.Thisvaportravelsthroughthe4-wayvalvetotheaccumulator.

4 Temperature Sensor Te

TheoutdoorcoiltemperaturewillbesensedbytheDefrostSensor.ThesensorwillusethistemperaturetotoadjustEEVopenangleandtocalculatewhenadefrostcycleisnecessary.

5 Temperature Sensor Toci

Thistemperaturesensorisnowsensingthesuctionlinetemperature of the refrigerant vapor leaving the outdoor coil. ThistemperatureisusedtoadjusttheEEVopenangle.

Thevaporrefrigerantwillthenenterthe4-wayvalveandbedirectedtothecompressorsuctionaccumulator.Theaccumulatorwillpreventanyremainingliquidrefrigerantfromentering the compressor.

Thevaporwillexittheaccumulatorandenterthecompressor.Thiscyclerepeatsuntilthedemandforheatingends.

6 Temperature Sensor Ts

ThetemperatureofthesuctiongasenteringthecompressorismonitoredbytheSuctionTemperatureSensor.

Asthedemandbecomeslesswhiletheindoortemperaturerisestowardthedesiredtemperature,thecompressorwillreducespeed.Whenthesettemperatureisreached,thecompressorandoutdoorfanwillshutoff.Thecirculatingfanof each indoor unit continues to run.

Heating Mode Sequence of Operation


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Defrost Cycle Sequence of Operation

Beginning end

Fixed frequency Indicated FQY 60s Defrosting FQY 80 Hz（E） 60s Soft startup

Compressor

0HZ 0HZ

5s

Outdoor motor ON Send defrosting signal to indoor Auto

OFF

4-way valve ON

OFF 15s

450-pulse 450-pulse

350-pulse(E)

All EEVs Auto open angle Auto open angle

All indoor motors ON

OFF Anti- cold air fun ction

Multi:


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Operating Parameters

Electronic Expansion Valve (EEV) Control

Electronic characteristics

Max. open angle 480pulsesDriving speed PPS

OpenanglelimitationofEEV

Unitstop Max. open angle ThermostatOFF Min. open angle

Cool/dry 5pulses 480pulses 5pulses 80pulsesHeat 5pulses 480pulses 50pulses 80pulses

TheEEVroutinelyopensandclosestomaintainthecompressordischargetemperaturewithinanacceptablerange.

compressor ON OFF

4-way valve ON OFF

50S 2 minutes and 55s

4-Way Valve Heating Control

Whenthecompressorstartsintheheatingmode,thereisa1-minutedelaybeforepowerisappliedtothe4-wayvalvetoswitchtheflowofhotrefrigeranttotheindoorcoil.Whenthecallforheatissatisfiedandthecompressorshutsoff,a3-minutedelaywilloccurbeforethe4-wayvalveispowereddownandswitchesbacktotheat-rest(cooling)position.

Ifthe4-wayvalvedoesnotswitchintotheheatingmode,after15minutesofcompressorruntimeandtheindoorcoiltemperatureisbelow41°F/5°C,thecompressorwillstopandtheunitwilldisplaya17-flasherrorcodeontheoutdoorPCB.

Compressor Sump Heater

Thesump(crankcase)heaterkeepsrefrigerantatahighertemperaturethanthecoldestpartofthesystem.Thispreventsrefrigerantfrommixingwiththecompressoroilandalsodriescondensedrefrigerantinsidethesump.Thesumpheaterwillbeenergizedwhentheambienttemperatureisbelow81°F/27°Candwillbeoffwhentheambientis90°F/32°C.

HeaterOFF HeaterON*min

Ta>50OF(10OC)ORTd>=68OF(20OC) 0 0

41OF(5OC<Ta≤50OF(10OC)andTd<68OF(20OC) 50%*60min 50%*60min

32OF(0OC)<Ta≤41OF(5OC)andTd<68OF(20OC) 33%*60min 66%*60min

32OF(0OC)>=TaandTd<68OF(20OC) 0 100%*60min


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Base Pan Heater Control Logic

Whenthecompressorstartsintheheatingmode,thefollowingconditionswillapply:

Troubleshooting the base pan heater error: STEP1: Checkthepanheaterforanopencircuitorshirtcircuit.UnplugtheconnectorfrommaincontrolPCB.Testtheresistancebetweenthetwopinsofthepanheaterconnector.Itshouldbe0.28-0.379KΩ.Ifoutofrange,changethepanheater.Ifnormalgostep2.

STEP 2:Checkthemaincontrolboardpanheateroutputport.UnplugtheconnectorfrommaincontrolPCB.RuntheODUwithmanuallyforcedheating(SetthedisplayboardSW1-1asON).TestthevoltagebetweenthetwopinsatCN4,itshouldbe208-230Vac.

Defrost Control

Intheheatingmodeandalongwiththeambientsensor,thedefrostsensormonitorsthetemperatureoftheoutdoorcoiltodetermineifdefrostisneeded.Ifthecompressorhasbeenrunningfor10minutescontinuouslyandfor45minutesoverall,thedifferencebetweentheambientsensor(Ta)andthedefrostsensor(Te)willbechecked.Thesystemwillinitiatethedefrostcycleifthefollowingconditionscanbemetfor5continuousminutes:

Te≤CxTa-ATe:DefrosttemperaturesensorTa:AmbienttemperatureC:0.80ifTa<32°F/0°C 0.60ifTa≥32°F/0°CA:8,moderateclimate(factorysetting)6,severeclimate(alternatesetting)

End defrosting: Ifthedefrostsensor(Te)detectsthetemperatureoftheoutdoorcoilisabove44oF(7oC)for60secondsorisabove54oF(12oC)for30seconds,thedefrostcyclewillterminate.Ifthesetemperaturescannotbereached,thedefrostcyclewillautomaticallyterminatein10minutes.

Timed defrost option:•WhentheoutdoorambienttemperaturesensordetectsTaislessthan32oF(0oC)•Inheatingmode,compressorrunscontinuouslyfor60minutesorfor240minutesinallWhentheaboveconditionsaremet,thesystemwilldefrost.Defrostingfrequencyis68HZ,withadefrostingtimeof8minutes.

OutdoorTemperature PanHeater

>37oF(3oC) OFF

28oF(-2oC)to34oF(1oC) OFF20min.ON10min.

10oF(-12oC)to25oF(-4oC) OFF15min.ON15min.

<10oF(-12oC) ON


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Discharge Sensor Protection

Ifthedischargetemperatureishigherthannormal,thecompressorwillslowdowntolowerthetemperature.

Dis

char

ging

t em

p.

Td

Reduce FQY rapidly 2HZ/S


Reduce FQY slowly 1HZ/10S

Remain FQY

Increase FQY slowly 1HZ/10S

118℃

115℃

112℃

109℃

105℃

95℃

Unitary:

Multi:D

isch

argi

ng te

mp.

Td


Reduce FQY slowly 1HZ/10S

Remain FQY

Increase FQY slowly 1HZ/10S

If keeping for 10s, the unit stops, 3 minutes later, the unit canre-startup. If in 60 minutesthe unit occurs alarm for 3 times, thefailure can be eliminated.

Remain FQY

If the discharge temperature sensor reaches 243F for 10 seconds, the compressor will shut off. After the 3-minute time delay, the compressor will restart. If this occurs three times in a 60-minute period, the compressor will lock out. Until the cause of the high temperature is discovered, the compressor will not restart until the power is interrupted then restored.

203℉( 95℃)

207℉( 97℃)

225℉( 107℃)

234℉( 112℃)

243℉( 117℃)

High Current Protection

Thebelowtableistheoutdoorunitprotectioncurrentandcompressorcurrent.

Ifthetemperaturereaches150OF(66OC)threetimesinonehour,thesystemwilllockout.Resetbyturningpoweroffandbackon.

ReduceFQYrapidly2Hz/S


ReduceFQYrapidly1Hz/10S

RemainFQY

ReduceFQYslowly1Hz/S

100%*I

98%*I

96%*I

96%*I

90%*I

88%*I

RemainFQY

Model Maximumcurrent(I) Compressorcurrent(CT)2U20EH2VHA 12.5A 10A3U24EH2VHA 13.5 14A


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High Pressure Protection

High Pressure Protection in Cooling

Ifthereisanabnormalstop3timesin1hour,theunitwillturnoff.Turnoffandrestorepowertoclearerror.


ReduceFQYslowly1Hz/S

RemainFQY

RaiseFQYslowly1Hz/10S

131OF(55OC)

Tc--cooling

138OF(59OC)

144OF(62OC)

147OF(64OC)

150OF(66OC)

RemainFQY


High Pressure Protection In Heating

Ifthetemperaturereaches158OF(70OC)threetimesinonehour,thesystemwilllockout.Resetbyturningpoweroffandbackon.


ReduceFQYslowly1Hz/10S

RemainFQY


129OF(54OC)

Tc--heating

135OF(57OC)

138OF(59OC)

145OF(63OC)

158OF(70OC)

RemainFQY


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Low Pressure Protection

Withthecompressorrunning,ifthelowpressureswitchopensfor1minute,thecompressorwillstop.Ifthisconditionoccurs3timesinanhour,thecompressorwilllockoutandalowpressureerrorcodewillbedisplayedattheindoor unit. Ifthecompressorisnotrunningandtheswitchopensfor30seconds,alowpressureerrorcodewillbedisplayed.

Thelowpressureswitchdoesnotstopcompressoroperationorsignalanerrorcodeduringthefollowingconditions:

•Thefirst8minutesofruntimewhenthecompressorstartsanewcycle•During defrost•Whentheambienttemperatureisbelow32°F/0°C•Followingtheterminationofanoilreturncycle

Whenanyoftheabove4conditionsarepresent,lowpressureprotectionisprovidedbythecoiltemperaturesensorsinbothheating(Te)andcooling(Tc2)modes.


Operatenormally

Min.runningFQY20Hz

LPOFF&FQY20Hz

LPON&FQY20Hz


-49OF(-45OC)

Tc2

-40OF(-40OC)

-31OF(-35OC)

-22OF(-30OC)

-13OF(-25OC)

Low Pressure Protection in Heating Mode:

Operatenormally

Min.runningFQY20Hz

LPOFF&FQY20Hz

LPON&FQY20Hz


-49OF(-45OC)

Te

-40OF(-40OC)

-31OF(-35OC)

-22OF(-30OC)

-58OF(-45OC)

Low Pressure Protection in Cooling Mode:


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Send oil return signal oil return begins oil return over

60s ref. eliminated 30s Oil return frequency auto frequency

Low frequency

Inverter compressor auto frequency 350 pulses(E)

running indoor EEV auto angle auto angle 120 pulses(E)

80(E) stopped indoor EEV OFF angle 5(E) OFF angle 5(E)

Outdoor motor AUTO AUTO (TC or ambient temp. control) AUTO

running indoor motor AUTO AUTO (set fan speed) AUTO

stopped indoor motor STOP STOP STOP

4-way valve OFF OFF OFF

MULTI:

D: Entering Conditions When the compressor running frequency is lower than 58Hz (E) continuously for 8 hrs, the system will enter the oil return cycle.. In the course of mode changeover, manual unit stop or protective unit stop, the time will be accumulative. After the compressor restarts up, the time will be counted continuously. In a continuous 8 hrs, if the compressor running frequency is not less than 72Hz for over 10 minutes continuously, the accumulative time will be cleared. Also after the heating defrosting, the time will be cleared.

F: Error Code Occurrence During Oil Return CycleIf the system stops during an oil return cycle due to an error code, the cycle timing will resume when the system restarts after the error is cleared.If there is a switch from heating to cooling, or from cooling to heating during the oil return cycle timing, and the system stops due to an error code, the oil return cycle will occur immediately when the error code is cleared.

Oil Return in Cooling Mode:

Oil Return Cycle

Whenthecompressorisoperatingatlowloadconditions,ortheoperatingfrequencyhasbeenbelow70Hzcontinuouslyfor4hours,thesystemwillentertheoilreturncycle.Thisensuresthatoilwhichmaybetrappedwithinthesystematlowloadswillreturn to the compressor crankcase.

Ifa4-hourlowspeedruntimehasoccurred,theoilreturnprocedureinitiatesbyautomaticallyrampingupthecompressorspeedtoatleast85Hzforapre-settime,uptoa9-minutemaximum.Thehigherspeedwillwickhidingoilintothenowfaster-movingrefrigerantanddeposititinthecompressorcrankcase.Toavoidoccupantdiscomfortwhentheoilreturncycleisactive,theindoor fan shuts off.

Shouldanerrorcoderesultinasystemshutdown,theoilreturncycletimingwillresumewhentheerrorcodehasbeencleared.

Oil Return in Cooling Mode

Oil Return Exit Conditions, Cooling:

1 minute later after oil return is over ＆ Td Tc‐ ＞86℉（30 ℃）

OR OR Ts Tc2AVE‐ ＞86℉（30 ℃） Tc2AVE＜

Max. 10 minutes

Oil Return in Heating Mode

Oil Return Exit Conditions, Heating: Max. 9 minutes (E)

OR OR Td Tc‐ ＜ for 30s continuously(5 minutes later, begin to count)

＆ Ts Tc2AVE‐ ＜ for 30s continuously(5 minutes later, begin to count)

Running for min. 5 minutes


Inverter compressor indicated FQCY 60s oil return FQCY 60s soft startup

0HZ 0HZ 5s

Outdoor motor AUTO AUTO AUTO (TC control)

4-way valve ON

OFF 15s

450 pulses 450 pulses

350 pulses

All expansion valves auto angle auto angle

Indoor fan motor ON OFF Cold air proving mode

-31℉（-35 ℃）

68℉(20 ℃)

59℉(15 ℃)


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Oil Return Exit Conditions, Cooling:

1 minute later after oil return is over ＆ Td Tc‐ ＞86℉（30 ℃）

OR OR Ts Tc2AVE‐ ＞86℉（30 ℃） Tc2AVE＜

Max. 10 minutes


Oil Return Exit Conditions, Heating: Max. 9 minutes (E)

OR OR Td Tc‐ ＜ for 30s continuously(5 minutes later, begin to count)

＆ Ts Tc2AVE‐ ＜ for 30s continuously(5 minutes later, begin to count)

Running for min. 5 minutes


Inverter compressor indicated FQCY 60s oil return FQCY 60s soft startup

0HZ 0HZ 5s

Outdoor motor AUTO AUTO AUTO (TC control)

4-way valve ON

OFF 15s

450 pulses 450 pulses

350 pulses

All expansion valves auto angle auto angle

Indoor fan motor ON OFF Cold air proving mode

-31℉（-35 ℃）

68℉(20 ℃)

59℉(15 ℃)


ERROR CODES & TROUBLESHOOTING PAGE 27

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Error Codes & Troubleshooting

Component Testing .......................................................................................................................................................... 28 Outdoor Fan Motor ........................................................................................................................................................................ 28 Temperature Sensor ..................................................................................................................................................................... 28 4-Way Valve ................................................................................................................................................................................... 29Error Codes ...................................................................................................................................................................... 30Outdoor Unit Error Codes ................................................................................................................................................ 31 Temperature Sensor Error Codes ................................................................................................................................................ 31 ErrorCode10 ........................................................................................................................................................... 31 ErrorCode11 ........................................................................................................................................................... 31 ErrorCode12 ........................................................................................................................................................... 31 ErrorCode13 ........................................................................................................................................................... 31 ErrorCode28-36 ..................................................................................................................................................... 31 ErrorCode38 ........................................................................................................................................................... 31 ErrorCode39 ........................................................................................................................................................... 31 ErrorCode41 ........................................................................................................................................................... 31 Pressure-Related Error Codes ...................................................................................................................................................... 32 ErrorCode42&43 ................................................................................................................................................... 32 ErrorCode44 ........................................................................................................................................................... 32 ErrorCode45 ........................................................................................................................................................... 32 Communication Error Code .......................................................................................................................................................... 32 ErrorCode15 ........................................................................................................................................................... 32 Error Codes Caused by Abnormal Refrigerant Circuit Conditions ............................................................................................. 33 ErrorCode8 ............................................................................................................................................................. 33 ErrorCode16 ........................................................................................................................................................... 33 Outdoor Error Code Related to Indoor Unit ................................................................................................................................. 33 ErrorCode21 ........................................................................................................................................................... 33 Error Code Related to the PCB ..................................................................................................................................................... 33 ErrorCode1 ............................................................................................................................................................. 33 Error Codes Related to the IPM..................................................................................................................................................... 33 ErrorCode2 ............................................................................................................................................................. 33 ErrorCode4 ............................................................................................................................................................. 33 ErrorCode5 ............................................................................................................................................................. 33 ErrorCode6 ............................................................................................................................................................. 33 ErrorCode18 ........................................................................................................................................................... 33 ErrorCode23 ........................................................................................................................................................... 34 ErrorCode26 ........................................................................................................................................................... 34 ErrorCode27 ........................................................................................................................................................... 34 Error Codes Related to Compressor, Outdoor Fan, & 4-Way Valve ............................................................................................ 34 ErrorCode9 ............................................................................................................................................................. 34 ErrorCode17 ........................................................................................................................................................... 34 ErrorCode24 ........................................................................................................................................................... 34Troubleshooting ............................................................................................................................................................... 34 [1] Outdoor EEPROM malfunction ................................................................................................................................................34 [2] Outdoor IPM over current or short circuit .............................................................................................................................. 34 [4] Communication abnormal between PCB and IPM ................................................................................................................. 35 [6] DC voltage or AC voltage high ................................................................................................................................................ 35 [8] High discharge temperature protection ................................................................................................................................. 36 [9] DC fan motor fault ................................................................................................................................................................... 36 [10,11,12,13]Temp. Sensor fault ................................................................................................................................................. 37 [15] Communication abnormal between indoor unit and outdoor unit ..................................................................................... 37 [16] Lack of refrigerant or discharge pipe blocked ...................................................................................................................... 38 [17] 4-way valve reversing failure ................................................................................................................................................ 38 [18] Compressor motor desynchronizing.................................................................................................................................... 39 [24] Compressor startup failure .................................................................................................................................................. 39 [25] Input overcurrent of the IPM module.................................................................................................................................... 39 [42] Open high pressure switch .................................................................................................................................................... 40 [43] Open low pressure switch ..................................................................................................................................................... 40 [44] High pressure detected in system ........................................................................................................................................ 41 [45] Low pressure detected in system ......................................................................................................................................... 41

Table of Contents

ERROR CODES & TROUBLESHOOTINGPAGE 28

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Component Testing

Outdoor Fan Motor

Checkthatthewiringandplugconnectionsareingoodcondition.

Iftheoutdoorunitfanmotordoesnotrun,ortheServiceMonitorBoardindicatesanerrorcodeof09,checkthefollowingvoltagesatconnectorCN11ontheoutdoorunitPCB.SetthemetertoreadDCvoltswithaminimumvoltagerangeof350volts.Allvoltagevaluesareapproximate.Initiateforcedcooling.

DCvoltagebetweentheRedandBlackwiresontheCN11plugshouldread310~334VDC.Thisisthemainvoltageforpoweringthefanmotor.

DCvoltagebetweentheWhiteandBlackwiresontheCN11plugshouldread15VDC.Thisisthevoltageforpoweringtheelectroniccircuitofthefanmotor.

DCvoltagebetweentheYellowandBlackwiresontheCN11plugshouldread4VDC.Thevoltagewillread0VDCwhenthefanisnotbeingcalledtooperate.Thisisthecontrolvoltage for regulating the speed of the fan motor. DCvoltagebetweentheBlueandBlackwiresontheCN11plugshouldread8VDC.Thevoltagewillread14VDCwhenthefanisnotbeingcalledtooperate.(ThisisthefeedbackvoltagetothePCBfordeterminingthespeedofthefanmotor)

Iftheoutdoorfaninitiallyruns,increasesspeedthenstops,andtheServiceMonitorBoardindicatesanerrorcodeof09,thefeedbackcircuitisnotfunctioning.Checkthatthewiringandplug connections are in good condition.

OutdoorFan310VDC Pins1-3

OutdoorFan15VDC Pins3-4

OutdoorFanControl Pins3-5

OutdoorFanFeedback Pins3-6

Temperature Sensor

Thetemperaturesensorsarenegativecoefficientthermistors,inwhichresistancedecreasesastemperaturerises.Shouldthesensorsfail,thePCBwillgenerateanappropriateerrorcode.

Tocheckthecalibrationofthesensors:

Shutoffpowertotheoutdoorunit.

Disconnect the sensor at the circuit board plug.

Measure the temperature of the air surrounding the sensor.

Measure the electrical resistance of the sensor using needle probes. Do not force standard probes into the sensor plug.

Comparethemeasuredresistanceofthesensoragainsttheresistance/temperaturespecifications(refertoReferenceInformationsectionforsensortables).

Ifthesensorresistanceisoutsideofthespecificationtolerancesshownontheresistance/temperaturetable,replacethesensor.

1

1

1

2

3

4

5

6

2

3

4

2

3

4

2

4


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Component Testing

4-Way Valve

The4-wayvalvewillcontrolthedirectionofhotgasdischargeviaaninternalslideassembly.Thevalvehasalinevoltagesolenoidthatisenergizedinheatmode.Thesolenoidwilldirecttheinternalslide to send the hot gas to the indoor coil. During cooling mode de-energizedoperation,theinternalslidewilldirectcompressorhot gas to the outdoor coil.

4-wayvalvesmayhaveafailureoftheelectricalsolenoidthatpreventsthevalvefromshifting,ortheymaybecomestuckduetodebrislodginginsidethevalvebody.Ifthevalvefailstodirectthehotgasintheproperdirection,temperaturesensorswithintheoutdoorunitwilldetecttheproblemandgenerateanerrorcode.

Ifthevalvefailstoshiftthehotgastothepropercoil,oritonlypartiallyshifts,performthefollowing:

Checkforcorrectrefrigerantcharge,andthatallotheroperatingparametershavebeenmet.

Intheheatingmode,thesolenoidwillshiftafterashorttimedelay.Checkforlinevoltagetothesolenoidcoil.

Ifthevalvehasvoltagebutfailstoshiftthehotgastotheindoorcoil,shutthesystemdownandunplugthe4-wayvalvefromthePCBplug.

Useanohmmetertocheckcontinuitythroughthesolenoidcoil.Ifthecoilresistancedoesnotmatchthechartinthismanual,orifawindingshowsopenorshorted,thesolenoidcoilwillhavetobereplaced.

Ifthecoilresistanceiswithinthetolerance,useamagnetalongthevalvebodytodeterminethelocationofthepiston.Ifoneendofthepistonisagainsttheendofthevalvebody,itisstuckandthevalvemustbereplaced.

Partialshiftingofthevalvecanbedetectedbymeasuringthetemperatureofthesuctiongaswhereitentersthereversingvalveandthencomparingthattemperaturetothetemperatureofthesuctiongasexitingthe4-wayvalve.Thereshouldbenomorethan3Fdifference.Excessivetemperaturerisethroughthesuctiongaspathisanindicationofastuckpiston.Ifthepistonwillnotbecomefreebyswitchingfromheatingtocoolingseveraltimes,aslighttappingonthevalvebody,orbyusingapowerfulmagnet,thevalvewillrequirereplacement.

1

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Error Codes

Error Code Diagnosis

1 OutdoorPCBEEPROMfault

2 IPMfault

4 CommunicationfailurebetweenIMPandPCB

5 Compressoroverloadprotection

6 Unreliablepowerinput

8 Compressordischargetemperaturetoohigh

9 Outdoorfanmotorfault

10 Defrost sensor fault

11 Compressorsuctiontemperaturesensorfault

12 Outdoorambienttemperaturesensorfault

13 Compressordischargetemperaturesensorfault

15 Communicationfaultbetweenindoorandoutdoorunit

16 Lackofrefrigerant

17 4-wayvalveswitchingfailure

18 Compressoroutofsynchronism

20 Indoorthermaloverload

21 Indoorcoilfrosted

23 IPMtemperaturetoohigh

24 Compressorstartfailure

25 IPMcurrenttoohigh

26 PCBreset

27 IPMcurrentdetectcircuitmalfunction

28 IndoorunitAliquidpipetemperaturesensormalfunction

29 IndoorunitBliquidpipetemperaturesensormalfunction

30 IndoorunitCliquidpipetemperaturesensormalfunction

31 IndoorunitDliquidpipetemperaturesensormalfunction

32 IndoorunitAgaspipetemperaturesensormalfunction

33 IndoorunitBgaspipetemperaturesensormalfunction

34 IndoorunitCgaspipetemperaturesensormalfunction

35 IndoorunitDgaspipetemperaturesensormalfunction

36 IndoorunitEgaspipetemperaturesensormalfunction

38 IPMtemperaturesensorfault/momentarypowerfailuredetected

39 Condensingtemperaturesensormalfunction

40 IndoorunitEliquidpipetemperaturesensormalfunction

41 ‘Toci’temperaturesensormalfunction

42 OpenHighPressureSwitch

43 OpenLowPressureSwitch

44 HighPressureDetectedinSystem

45 LowPressureDetectedinSystem

Lo Ambientsensorlowtemperaturedetection

Precautions For Adding Refrigerant1. ThissystemmustuserefrigerantR410A.2. Addrefrigerant0.20oz/ftpermeter

whenthetotalpipinglengthexceedsthestandard value.

3. Thetotalliquidpipinglengthmustbelessthan the max value.

Outdoor Unit Std. Value Max Value

2U20EH2VHA 15m/50ft. 50m/164ft.

3U24EH2VHA 23m/75ft. 60m/200ft.

Notes:1. Noaddressingisnecessary.Allindoor

wiringconnectionsmustmatchtheoutdoorconnections,oracommunicationfailurewillresult.

2. SetSW5-8toONforQuietOperationifdesired.Maximumcapacitymaybeslightlyreduced.

3. Donotchangeanyswitchsettingsunlessdirected to do so.

*PCB:PrintedCircuitBoard*IPM:InverterPowerModule*EEV:ElectronicExpansionValve


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Outdoor Unit Error Codes

Error Code 10 Thiscodeindicatesanelectricalfailureofthesensorthatisused to sense the temperature of the outdoor coil during defrost.ThissensorisconnectedtothePCBviaaconnectionatPlugCN-14.

Error Code 11 Thiscodeindicatesanelectricalfailureofthesensorthatisused to sense the temperature of the suction gas that enters thecompressor.ThesensorisconnectedtothePCBviatwowiresatPlugCN-14.

Error Code 12

Thiscodeindicatesanelectricalfailureofthesensorthatisusedtosensethetemperatureoftheoutdoorair.ThesensorisconnectedtothePCBviatwowiresatPlugCN-14.

Error Code 13 Thiscodeindicatesanelectricalfailureofthesensorthatisused to sense the temperature of the compressor hot gas dischargeline.ThesensorisconnectedtothePCBviatwowiresatPlugCN-14.

Temperature Sensor Error Codes

Theeasiestproblemstosolvewillinvolvecodesthatarerelatedtopotentialfailureoftemperaturesensors.Commonproblemsmayincludelooseconnections,openorshorted,andoutofcalibration.Checkingtheconditionofthesensorsrequiresatemperature probe and an ohmmeter.

TheReferenceSectionofthismanualcontainstemperatureresistancetablesthatcanbeusedtocheckthecalibrationofthesensors.Themeasuredresistancemustbewithinthetoleranceslocatedinthetables.

Thereare16potentialErrorCodesthatcanbegeneratedbythePCBtoindicateafailureofanoutdoorunittemperaturesensor.

Whenthesystemgeneratesanerrorcode,itwillbedisplayedontheServiceMonitorBoard,thenumberofflashesonthePCB,andalsoontheindoorunitdisplaypanel.

Error Code 28-36 ThesecodesindicateafailureofeitheraLiquidorGasTemperatureSensorthatispartofeithertheA,B,C,orDindoorunitEEVcircuit.RefertotheoutdoorunitErrorCodeDecalforspecificidentificationofthemalfunctioningtemperaturesensor.ThesesensorsconnecttothePCBatconnectionplugsnearthecenterofthecircuitboard.(Notethatifthesensorhasfailed,andthereisanunusedportontheunitavailable,thesensorfromtheunusedportcanbeusedtotemporarilyfixtheproblem.)

Error Code 38 ThiscodeindicatesapotentialfailureoftheIPMtemperaturesensor.ThissensorconnectstotheIPMviaPlugCN-8.Thissensor is mounted near the heat sink.

Error Code 39 Thiscodeindicatesanelectricalfailureofthesensorthatisused to sense the condensing temperature of the outdoor coil.ThesensorisconnectedtothePCBviatwowiresatPlugCN-14.

Error Code 41 Thiscodeindicatesanelectricalfailureofthe'Toci'sensor,whichensuresthereisnodropinhotgastemperaturethroughthe4-wayvalve.ThesensorisconnectedtothePCBviatwowiresatPlugCN-7.


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Error Code 42 & 43 ThelowpressureswitchwillgenerateanErrorCode43ifopen.AnopenhighpressureswitchwillshowanErrorCode42.

Testing ProcedureIfthesystemgenerateseitherofthesetwocodes,checkthecontinuityoftheswitchtoensureitisnotopenorshorted.Highorlowpressuresareusuallyrelatedtodirtinthecoils,dirtintheairfilter,orincorrectrefrigerantcharge.

Therearenopressureportsthatcanbeaccessedtomeasurelowpressureinheatmodenorhighpressureincoolmode.Ifthesystemtripsononeoftheseerrors,itwillbenecessarytoremovetherefrigerantandre-chargetoconfirmloworhighcharge is not causing the problem.

Error Code 44 Thesystemisoperatingatexcessiverefrigerantpressure.Ifthesystemisanewinstallation,itislikelythatthechargeistoohigh.NotetheWeightMethodistheONLYwaytochargethissystem.

TypicalCausesofHighPressureinCoolingMode:•Overcharge•Dirtyoutdoorcoil•Restriction

TypicalCausesofHighPressureinHeatingMode:•Overcharge•Undersizedrefrigerantlinesorexcessivelength•Restriction

Note: If the refrigerant pressures are correct, yet the system does not close the error reporting pressure switch, replace the defective pressure switch.

LowPressureSwitch

HighPres-sureSwitch

Error Code 45 Thiscodeisindicatingthatsystempressureistoolow.

TypicalCausesofLowPressureinCoolingMode:•Lackofcharge•LowHeatonIndoorcoil•Restrictions,airflow,ordirt•Lowindoorload

TypicalCausesofLowPressureinHeatingMode:•Coldoutdoorair•Lackofcharge•Restriction

Pressure-Related Error Codes

Toprotectthecompressor,thePCBhasalowpressureswitchconnectionatCN13,andahighpressureswitchconnectionatCN12.

Communication Error Code

Error Code 15 Datatravelsbetweentheunitsontheterminalblockconnections3/Cand1.AcorrectconnectionforeachunitisindicatedbyasolidgreenLEDontheServiceMonitorBoard.IfanLEDisflashingornoton,makesurethe14/4strandedcopper communication cable connections are tight and onthecorrectterminals.Additionally,ensuretherearenosplicesinthe3/Cwire,andthatthePCBconnectionsatCN21areingoodorder.Anincompleteorinadequategroundcaneasilybeanissue.


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Error Codes Caused by Abnormal Refrigerant Circuit Conditions

Error Code 8 Thiscodeindicatesthetemperatureofthecompressorhotgasistoohigh.ThiserroroccursafterthePCBhasattemptedtocorrecthightemperaturebyreducingthecompressorspeed,adjustingthefanspeed,oropeningtheEEV.Causesofthistypeofconditionaretypicallyalackofrefrigerantinthesystem,excessiveheatintheconditionedspace,orarestriction in the refrigeration circuit.

Error Code 16 Thiserrorcodeindicatesthesystemmaylackrefrigerant.Recoverandcheckthesystemcharge.

Outdoor Error Code Related to Indoor Unit

Error Code 21 Thiscodeindicatestheindoorcoilhasfrosted.Thisconditioncanbeduetoalackofheatintheconditionedspace,operatingtheindoorunitatexcessivelycoldairtemperature,ablockageofairflowtotheindoorunit,oranissuewiththeindoorfanmotor.Thisconditionwillcausethesystemtoenterananti-freezingcycle.

Error Code Related to the PCB

Error Code 1 TheEEPROMofthePCBcannotreadorwritedata.ReplacethePCB.

Error Codes Related to the IPM

Error Code 2 TheIPMhaseitherfailedorhasdetectedexcessivecurrent.BeforereplacingtheIPM,checkthesepotentialcausesofhighcurrent:•Overcharge•Dirtyoutdoorcoil•Hotconditionedspace •Hightemperatureorexcessiveload•Refrigerationcircuitrestriction•Seizedcompressor•Faultywiringorwiringconnections

Error Code 4 ThiscodeindicatestheIPMisnotcommunicatingwiththePCB.CheckthewiringandtheconnectionsCN9onthePCBandCN15ontheIPM.Iftheconnectionsaregood,yettheboardsdonotcommunicateandthecodewillnotclear,checkforcorrectvoltageattheIPMCN15connection.Ifthecommunication voltage is correct and the high voltage input ispresent,replacetheIPM.Ifthecommunicationvoltageisnotcorrect,replacethePCB.

Error Code 5 TheIPMisprotectingthecompressorfromoverload,whichcanbecausedbylowbuildingpowersupply,restrictions,anon-condensibleinthesystem,apluggedcoil,anexcessiveload,orarefrigerantovercharge.

Error Code 6 Thiscodeindicatestheoperatingvoltageofthesystemiseithertoohighortoolow.Checklinevoltageforproperlimits.Thelinevoltagesuppliedtotheoutdoorunitshouldbenolowerthan187VACwhenthecompressorstarts.Therunningvoltageshouldbenolowerthan197VAC.Theincominglinevoltage to the outdoor unit should never be higher than 253VAC.Ifimpropervoltageispresent,checkthesupplyvoltagecircuitfromthebuildingforcorrectwiresizeandgoodconnections.Ifthevoltageisstilloutsideoperatinglimits,contactthepowercompanytohavetheservicecorrected.

Ifthelinevoltagefromthepowercompanyiscorrect,checktheoutputvoltageofthePowerFilter.ThisvoltageconnectstotheIPMatterminalsACLandACN.Ifthevoltageisnotwithinspecificationsshownabove,replacethePFB.

Error Code 18 ThereisalossofsynchronizationamongtheU,V,andWcompressorwindingsduringfrequencychangesastheyslowdownorspeedupthecompressor.

Possiblecausesinclude:

•Unstablepowersupply•Internalcompressorfault•IPMfault•Compressorterminalwiringincorrect•Poorwiringcondition•Loosecompressorwiringconnection


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Troubleshooting

Error Code 23

ThiscodeindicatesanIPMthermaloverload.ThiserrorwasgeneratedbyatemperaturesensorlocatedintheIPMheatsink.Causesofoverheatingaretypicallyoverchargeofrefrigerant,excessivelypluggedcoil,sensoropenorshorted,oranon-condensableinsystem.

Error Code 26 ModuleresetindicatespossiblePCBpoweranomalies.Thisusuallyoccurswhenlowlinevoltageconditionsarepresent.

Error Code 27 TheIPMhasdetectedthatthecompressorcurrentistoohigh.

PossibleCauses:•Overcharge•Dirtyoutdoorcoil•Hotconditionedspacetemperatureorhighload•Refrigerationcircuitrestriction•Seizedcompressor•DefectiveIPM

Error Codes Related to Compressor, Outdoor Fan & 4-Way Valve

Error Code 9

Thiscodeindicatestheoutdoorfanmotorisnotrunning.ThefaultisdetectedveryquicklybythePCB.Thesystemwillshutoffanddisplaythiserrorcode.Ifthiserroroccurs,refertotheoutdoor fan motor test procedure.

Error Code 17

Thiserrorcodeindicatesthatthe4-wayvalveisnotdirectinghotgastothepropercoil.Refertothe4-wayvalvetestingprocedure.

Error Code 24

Thiserrorcodeindicatesthecompressorfailedtostartwhenacallforoperationoccurred.Refertothecompressortestingprocedure.

Codedisappearsafterpoweroff/onagain

CheckoutdoorPCB,Iffaulty,

replace it.

No

[1] Outdoor EEPROM malfunction

EEPROMcommunicationerror;EEPROMdatacheckerror(modelID,checksum,etc.);EEPROMdatalogicerror(widerdatarange,wrongorder,etc.)

Possible causes:•EEPROMisbad•LooseEEPROMwiring

Correctthewiring

Iselectricboxwiringcorrect,andiscompressorwiringfirmly

connected?

Iscompressornormal(compressorcoilresistor,

insulation)?

Ispowermodulenormal?

Replacecompressor

Replacepowermodule

Yes

Yes

Yes

No

No

No

Solveorcorrectanyfailures according to relative information

[2] Outdoor IPM over current or short circuit

3U24EH2VHA

InputovercurrentdetectedbyPIM’shardware.

Possible causes:•TheIPMisbad•Loosecompressorwire•Thecompressorisbad


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Troubleshooting

Adjustcommunicationwire

Isthecompressordrivemoduleinputpowernormal(TesttheACpowersupplyvoltageofthemodule’spowerinputACL-ACN:normalvalueshouldbetween196-

253VAC)?

ChecktheACvoltagebetweenthetwoterminalsofpowerfilterboardboardP7&theterminal3ofrelayRL1(208-230VAC)

Yes

Normal

No

IstheACpowersupplywirebetweencompressordrive

module and filterboardfirmlyconnected?

Fixwiring

Abnormal

CheckiftheoutputofmaincontrolboardCN6,CN34are

bothDC12V

No Main control board isbad,replace.

NoThefilterboardisbroken,

replace the filter board

No

[4] Communication abnormal between PCB and IPM

Controlboardcannotcommunicatewiththecompressor driver module for over4minutes

Possible causes:•Thecommunicationwireisbad•ThePCBisbad•Thepowermoduleisbad

CorrectpowersupplyIspowersupplyvoltage

normal?

Iselectricboxwiringcorrect?

IspowermodulevoltagebetweenterminalP&Nmorethan390Vorlessthan160V

during operation?

Correctthewiring

Replacepowermodule

Yes

Yes

No

No

Checkrectifier,rector,electrolyticcapacitoron

inverter main circuit

No

Yes

[6] DC voltage or AC voltage high

DrivermoduleACpowersupplyvoltageover280VAC,ordrivermoduleDC-BUSvoltageover390VDC.

Possible causes:•Thepowersupplyisabnormal•Incorrectwiring•Powermoduleisbad


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[8] Discharge temperature too high protection

ReconnectIssensorwiringfirmlyinplace?

Issensorresistancewithinrange?

Isthesystemisclogged?

IsthePMVcoilwiringok?

Isstopvalveisopen?

Replacepressureswitch

Checkthepipingsystem

Chargerefrigerant

Checkthepipingsystem

Reconnect

Yes

No

Yes

Yes

No

Yes

No

No

Yes

NoNo

Istheambienttemperaturetoohigh?

Replaceconnectingboard

Yes

No

Isthesystemlowonrefrigerant?

3U24EH2VHA

Compressordischargetemperatureover115°C.Errorclearswithin3minutesiftemperaturelowersbelow115°C.Errorstatuslockifitoccurs3timesin1hour.

Possible causes:•Thesensorisbadorfixedbad•Thesystemisclogged•Thesystemlackofrefrigerant•Thevalveopeningiswrong

Troubleshooting

ReplacewireandtestagainArethefanmotorwiresconductive?

Isthemotorrunning?

Poweroffandrotatethefanmotorbyhand.Does

itturnfreely?

Istheterminialvoltagecorrect?

ReplacePCB

Replacefanmotor

ReplacePCB

Yes

Yes

Yes

Yes

No

No

No

No

Replacefanmotor

[9] DC fan motor fault

DCfanmotordamaged,notconnected,orrelatedcircuitbroken.Errorstatusconfirmsandlocksifoccurs3timeswithin30minutes.

Possible causes:•Loosemotorwiring•Themotorisbad•ThePCBisbad


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Troubleshooting

Replacesensor

Isthesensorwiringfirmlyandcorrectlyin

place?

Isthesensorresistancewithin

range?

Isthetemperatureloopacquiredby

the computer board normal?

Replacesensor

Replaceit.

No

No

Yes

Yes

Yes

[10] Outdoor defrosting temp. sensor Te abnormal[11] Suction temp.sensor Ts abnormal[12] Outdoor ambient temp. sensor Ta abnormal[13] Discharging temp. sensor Td abnormal

Sensortemperaturehasbeendetectedbeloworhigherthanexpected,or has been detected as a shorted or open circuit(forexpectedtemperature,refertopartfailurecode)

Possible causes:•Badsensorconnection•Thesensorisbad•Sensor resistance drift•ThetemperatureacquiredbyPCBisnotaccurate

ReplacewireIsthecommunicationwireisshorted?

IsthecommunicationwireCN21isdisconnected?

Reconnect

Reconnect

Yes

No

No

Yes

Isthewiringconnectionsequencecorrectaccordingtothewiring

diagram?

No

Measure the outdoor terminal block voltage betweencommunication3andN,andmeasuretheindoorterminalblockbetweencommunication3andNtocheck.Isthecommunicationwireok?

Yes

Replacethecommunicationwire

Poweroff

Poweron

No

Yes

Usingamultimeter,measuretheterminalcorrespondingtotheN-linevoltageofCN21fromtheindoorunitwiththecommunicationfailure.Isthevoltage

normal?

No PCBisbad,replacePCB

[15] Communication abnormal between indoor unit and outdoor unit

Outdoorunitcontrolboardcannotcommunicatewiththeindoorunitcontrolboardforover4minutes.

Possible causes:•Badcommunicationwiring•ThePCBisbad


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Troubleshooting

[16] Lack of refrigerant or discharging pipe blocked

Discharge&suctiontemperatureTd-Ts≥80°C10minutesaftercompressorstart.Errorstatuslocksifitoccurs3timesin1hour.

Possible causes:•Wrongsensorconnection•Lackofrefrigerant•Thesenorisbad•The4-wayvalveisbad•Theelectronicexpansionvalveisbad•Outoftheoperatingrange

CorrectwiringIsthesensorwiringcorrectandfirmlyconnected?

Isthesystemleaking,orlacking refrigerant?

IstheresistanceoftheTdandtheTcmsensors

withinrange?

Repairleakandrechargerefrigerant

Replacethesensor

Yes

No

Yes

No

Usetheunitaccordingtotheallowableoperating

range of the unit.

Yes

IsthereanInternalleakageinthe4-way

valve?

No

Replace4-wayvalve

Yes

No

AdjustthevalveopeningYesIstheelectronic

expansion valve over throttled?

[17] 4-way valve reversing failure

Indoorpipe&indoorambienttemperatureTm-Tai≥5°C10minutesaftercompressorstarted.Errorstatuslocksifitoccurs3timesin1hour.

Possible causes:•The4-wayvalveisbad•ThePCBisbad•The4-wayvalvecoilconnectionisbad•Thesystempressuredifferenceistoosmall.

ReconnectIsconnectionbetweenthe4-wayvalveandPCBisgood?

Isthe4-wayvalvecoilwiringfirmlyinplaceandcharacteristics correct?

Isthesystemmeeting4-wayvalvereversing

conditions (Pd-Ps>0.6Mpa)?

Isthereairnoiseafter4-wayvalvereverses,andthetemp.ofconnectionpipeson4-way

valve normal?

Correctwiringorreplace

Checkifthecompressor is running

ReplacePCB

Replace4-wayvalve

Yes

Yes

Yes

No

Yes

No

No

Yes

No

Is208/230VACMeasuredonPVBCN5PCBafter4-way

valve reversing conditons are met?


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Troubleshooting

CorrectpowersupplyIssupplyvoltagenormal?

Iswireconnectionbetweenpowermodule

and compressor correct?

Ispowermoduleisnormal?

Correctthewiringaccording to diagram

Replacepowermodule

Yes

Yes

Yes

No

No

No


insulation)?Replace

compressor

Yes

No

Compressorloadistoohigh,findthereason

[18] Compressor motor desynchronizing

Motordesynchronizingoccurred.Causedbyoverload,loadsharplyfluctuating,abnormalcompressorcurrentsensorcircuit,oroneoftheinvertergatedrivesignalsismissing.

Possible causes:•Thepowersupplyisabnormal•Incorrectcompressorwiring•Thepowermoduleisbad•Thecompressorisbad•Thesystemisoverload

CorrectpowersupplyIssupplyvoltagenormal?

Iswiringbetweenpowermodule and compressor

correct?


Correctthewiringaccordingto diagram

Replacepowermodule

Yes

Yes

No

No

Compressorloadtoohigh,findthereason

Yes

Iscompressorisnormal(compressorcoilresistor,

insulation)?

No

Replacecompressor

No

[24] Compressor startup failure

Compressorstartfailurehasbeendetectedbydrivermodule.

Possible causes:•Thepowersupplyisabnormal•Incorrectcompressorwiring•Thepowermoduleisbad•Thecompressorisbad•Systemoverload

Correctthewiringaccordingto diagram

Iselectricboxandcompressorwiringcorrectandfirmlyinplace?


insulation)?


Replacecompressor

Replacepowermodule

Yes

Yes

Yes

No

No

No

[25] Input overcurrent of the drive module

Compressordrivemoduleinputcurrenthigherthan32A(doublefanmodel),or27A(singlefan).Locksifitoccurs3timesin1hour.

Possible causes:•Incorrectcompressorwiring•Thepowermoduleisbad•Thecompressorisbad

Solveorcorrectanyfailures according to relative information


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[42] Open high pressure switch

Highpressureswitch:Switchcircuithasbeendetectedopenfor30seconds(after3minuteofcompressorruntime).Errorlocksifitoccurs3timesin1hour.

Possible causes:•Incorrectpressureswitchwiring•Abnormalsystempressure•Systemisclogged•Incorrectrefrigerantcharge•Badvalve•Pressureswitchisbad•PCBisbad

Troubleshooting

ReconnectPower off, check if the pressure switch connection

is ok

Use multimeter to check if the high pressure witch

terminal is short circuit

Check if the EEV coil is fixed well

Check if stop valve is open

Use the multimeter to check if the resistance of Tc & Tm is ok

Check if the piping system is clogged

Check if the connection pipe is bent

The pressure is borken,replace it.

Open the stop valve

Clean the piping system

Replace the connection pipe

Replace the sensor

Y

Y

N

Y

Y

N

N

N

N

N

Y

N

N

Reconnect the EEV coil

Power on

Short high pressure switch terminal on the

PCB to check if the system reports failure

Check if fan motor is ok

Check if the resistance of Te and Tc is ok

The PCB is borken,replace it.

Replace sensor

N

Y

Y

Y

N

NReplace the fan motor

Topic Title


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[43] Open low pressure switch

Lowpressureswitch:Switchhasbeendetectedopenfor60seconds(after3minuteofcompressorruntime)oropenfor30secondsduringstandby.

Possible causes:•Incorrectpressureswitchwiring•Abnormalsystempressure•Systemisclogged•Incorrectrefrigerantcharge•Badvalve•Pressureswitchisbad•PCBisbad

ReconnectPower off, check if the pressure switch connection

is ok

Use multimeter to check if the low pressure witch terminal is short circuit

Check if the EEV coil is fixed well

Check if stop valve is open

Use the multimeter to check if the resistance of Tc & Tm is ok

Check if the piping system is clogged

Check if the connection pipe is bent

The pressure is borken,replace it.

Open the stop valve

Clean the piping system

Replace the connection pipe

Replace the sensor

Y

Y

N

Y

Y

N

N

N

N

N

Y

N

N

Reconnect the EEV coil

Power on

Short high pressure switch terminal on the PCB to check if

the system reports failure

Check if fan motor is ok

Check if the resistance of Te and Toci is ok

The PCB is borken,replace it.

Replace sensor

N

Y

Y

Y

N

NReplace the fan motor

Topic Title


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Troubleshooting

ReconnectPoweroff.Ispressureswitch

wiringconnectionok?

Usemultimetertocheckthehighpressureswitch.Istheswitch

short circuited?

IstheEEVcoilwiringcorrectandfirmlyinplace?

Isthestopvalveisopen?

UseamultimetertochecktheresistanceofTc&Tm.Aretheywithingrange?

Isthepipingsystemisclogged?

Istheconnectionpipeisbent?

Thepressureisbad,replace it.

Openthestopvalve

Cleanthepipingsystem

Replacetheconnectionpipe

Replacethesensor

Yes

Yes

No

Yes

Yes

No

No

No

No

No

Yes

NoNo

ReconnecttheEEVcoilwiring

[44] High pressure detected in system

TheminimumtemperaturevalueofindoorpipeTmandoutdoorTsislowerthan-45°Cduringcoolingmode,orminimumtemperaturevalueofoutdoorTcandoutdoorTeislowerthan-45°C.

Possible causes:•Highpressuresensordetectionvalueisincorrect•Refrigerantovercharge•Blockedliquidlinepiping•Theoutdoorunitcannotbeturnedonnormally

due to failure to open outdoor heat exchanger electronicexpansionvalvewhenheating.

•Theoperationenvironmentisbeyondtheallowedrange.

Poweron

ShortthelowpressureswitchterminalonthePCB.Doesthesystemreporta

failure?

Isthefanmotorok?

IstheresistanceofTeandTc2inrange?

ThePCBisbad,replace it.

Replacesensor

No

Yes

Yes

Yes

No

No Replacethefanmotor

[45] Low pressure detected in system

TheminimumtemperaturevalueofindoorpipeTmandoutdoorTsislowerthan-45°Cduringcoolingmode,orminimumtemperaturevalueofoutdoorTcandoutdoorTeislowerthan-45°C.

Possible causes:•Lowpressuresensordetectionvalueisincorrect•Lowrefrigerantcharge•Systemairleakage•Blockedlowpressureorliquidlinepiping•Theoutdoorunitcannotbeturnedonnormallydue

to failure to open outdoor heat exchanger electronic expansionvalvewhenheating.

•Theoperationenvironmentisbeyondtheallowedrange.

Topic Title

REFERENCE INFORMATIONPAGE 44

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Reference Information

Table of Contents

Specifications .................................................................................................................................................................. 45Dimensions ...................................................................................................................................................................... 46Piping Diagrams ............................................................................................................................................................... 47Wiring Diagrams............................................................................................................................................................... 48Outdoor/Indoor Wiring Connections ................................................................................................................................ 50Sensor Resistance Tables ................................................................................................................................................. 51

Topic Title

REFERENCE INFORMATION PAGE 45

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Specifications

Category Items 2U20EH2VHA 3U24EH2VHAMax#ofZones 2indoorzones 3indoorzones

Cooling Non-Ducted

RatedCapacityBtu/hr 18,100 22,000

CapacityRangeBtu/hr 7,000-20,000 6,000-23,600

RatedPowerInputkW 1.44 1.76

SEER/EER 17/12.5 18.5/12.5

MoistureRemovalPt./h 0.85 1.48

SHR 93% 93.0%

Cooling Ducted

RatedCapacityBtu/hr 16,000 20,000

CapacityRangeBtu/hr 7,000-19,000 6,000-22,300

RatedPowerInputW 1,481 1,786

SEER/EER 15/10.8 15/11.2

MoistureRemovalPt./h 0.85 1.42

SHR 93% 93%

Heating Non-Ducted

RatedHeatingCapacity47°FBtu/hr 20,000 24,000

HeatingCapacityRangeBtu/hr 8,000-20,000 8,000-30,600


COP/HSPF/COP@5°F 3.7/10.5/2.0 4.2/10.5/2.0


Max.HeatingCapacity17°FBtu/hr 26,000 27,000


HeatingCapacity-4°FBtu/hr 20,000 21,000

Max.HeatingCapacity-15°FBtu/hr 17,000 18,000

Heating Ducted


HeatingCapacityRangeBtu/hr 8,000-21,000 8,000-28,600


COP/HSPF/COP@5°F 2.94/9.6/1.9 3.0/9.3/1.9




HeatingCapacity-4°FBtu/hr 18,000 19,000

Max.HeatingCapacity-15°FBtu/hr 15,000 16,000

OperatingRange

Cooling°F(°C) 14~115(-10~46) 14~115(-10~46)

Heating°F(°C) -15~75(-26~24) -15~75(-26~24)

PowerSupply

Voltage,Cycle,PhaseV/Hz/- 208-230/60/1 208-230/60/1

WireSizebetweenIDandOD 14/4AWGStrandedCopper

CompressorType DCInverterDrivenRotary

MaximumFuseSizeA 25 25

MinimumCircuitAmpA 15 16

OutdoorUnit

OutdoorFanSpeedRPM 750 900

OutdoorNoiseLeveldB 56 56

Dimension:HeightxWidthxDepthin(mm) 33.1(840)x37.3(948)x13.4(340)

Weight(Ship/Net)-lbs(kg) 202.3/185.6(91.7/84.2) 205.9/189.5(93.4/85.9)

Indoorunitconnections 2 2or3

Refrigerant

Connections Flare Flare

LiquidO.D.in 1/4(2pcs) 1/4(3pcs)

SuctionO.D.in 3/8(2pcs) 1/2(1pcs)and3/8(2pcs)

FactoryChargeOz 99 99

MaximumLineLengthFt/m 164/50 196/60

MaximumHeightFt/m 50/15 50/15

MaximumLineLengthforeachindividualindoorunitFt/m 82/25 82/25

Dimensions ShippingHeightxWidthxDepthin(mm) 41.3(1,050)x41.7(1,060)x16.5(420)

Topic Title


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Dimensions

340●

Liquid pipe ●Ø6.35(flared) 1/4

B unit connectionA unit connection

Handle

12 1/4(311)

16 1

/16(

408)

1 1/8(28)

18 1

3/16

(478

)

33 1

/16(

840)

37 5/16(948)

21 1

/8(5

37)

Handle

Handle

Air outlet

Air inlet

Air inlet

7 1/4(184)

22 13/16(580)

7 1/4(184)

14 1

5/16

(380

)

16 1

/4(4

13)

35

13 3

/8(3

40)

Gas pipeΦ9.52(flared) 3/8(A,B unit)

2U20EH2VHA

12 1/4(311)

16 1

/16(

408)

1 1/8(28)

18 1

3/16

(478

)

33 1

/16(

840)

37 5/16(948)

21 1

/8(5

37)

Handle

Handle

Air outlet

Air inlet

Air inlet

7 1/4(184)

22 13/16(580)

7 1/4(184)

14 1

5/16

(380

)

16 1

/4(4

13)

35

13 3

/8(3

40)

340●

6

21

●

50

Liquid pipe Ø6.35(flared) 1/4

Gas pipeΦ9.52(flared) 3/8(A,B unit) Φ12.7(flared) 1/2(C unit)

C unit connectionB unit connectionA unit connection

Handle

3U24EH2VHA

Topic Title


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Piping Diagrams

Comp-

●

ressorDischarge temp.sensor

Oil separator Capillary tube

Ø2.7*Ø1.0*1400


4-way valve Pipe sensor ●

Toci

Suction temp.sensor

Low pressure switch

Accumulator

Gas service valve

Outdoorheat


FAN-OUT

●

Outdoorambient temperature sensor

Defrost sensor

Distributor

Strainer

EEV O

Receiver


5/8

3/8

Unit A liquid pipe temp. sensor TC2 Strainer EEV AIndoor unit A

Unit B liquid pipe temp. sensor TC2 Strainer EEV BIndoor unit B

Unit A gas pipe temp. sensor TC1

Unit B gas pipe temp. sensorTC1

Indoor unit A

Indoor unit B



FAN-IN


Indoor heat


2U20EH2VHA

3U24EH2VHA

Comp-ressor

Discharge temp.●

sensor


Ø2.7*Ø1.0*1400




Low pressure switch

Accumulator

Gas service valve

Outdoor heat


FAN-OUT


Defrost sensor Td

Distributor

Strainer

EEV O

Receiver


5/8

3/8







Indoor unit A

Indoor unit B

Indoor unit C



FAN-IN


Indoor heat


Topic Title


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Wiring Diagrams

2U20EH2VHA

GR

12

34

56

78

SW

3S

W4

SW

2S

W1

CN12LP

HP

CN13

CN9

GN

D

CN11

C

ON

8

CN

8

CN

5

W

TO M

odul

eM

LED

_GLE

D_R

CN6

4-WAY

VALV

ED

C-F

AN

MO

TO

R

M

250

VAC

T5A

FUS

E

CO

N9

FGV

spV

cc

CN25

CN16

AC

N

AC

L

ON

43

21

ON

W

W

Vdc

L1L2

Pow

er

CN

2

CN23

CN21

SW

6S

W5

WW

BB

CO

MP

RE

SS

OR

Y

MCN17

R

MCN15

CRAN

KCASE

HEATE

R

Def

initi

on o

f SW

6

12

34

OFF

OFF

OFF

OFF

OFF

OFF

OFF

ON

ON

ON

ON

ON

Cen

traliz

ed C

ontro

lA

ddre

ss=1

Add

ress

=2

Add

ress

=16

----

----

----

---

----

----

-

---

--

--

D

efin

ition

of S

W1

SW

1-1

SW1-

2 SW

1-3S

W1-

4N

orm

al O

pera

ting(

Def

ault)

OFF

OFF

OFF

OFF

ON

OFF

OFF

OFF

OFF

ON

OFF

OFF

OFF

OFF

ON

OFF

Forc

e H

eatin

gFo

rce

Coo

ling

Rat

ed O

pera

ting

To In

door

Uni

t B

21

3

OR: O

rang

e B:

Blac

k BL

: Blue

GR:

Gree

n R:

Red

Y/

G: Y

ellow

/Gre

en W

: Whit

e Y:

Yell

ow B

R: B

rown

E.

E.V:

Elec

tro ex

pans

ion va

lveLP

/HP:

Low

/high

pres

sure

switc

hTo

ci: O

utdo

or C

onde

nsin

g in

let T

emp.

sen

sor

Tc: O

utdo

or C

onde

nsin

g Te

mpe

ratu

re S

enso

r Ts

: Com

pres

sor S

uctio

n Te

mp.

Sen

sor

Ta: A

mbi

ent T

emp.

Sen

sor

Td: C

ompr

esso

r Dis

char

ge T

emp.

Sen

sor

Te: D

efro

stin

g Te

mp.

Sen

sor

Tm: M

odul

e Te

mp.

Sen

sor

Tc1(

a/b/

c/d/

e):C

onde

nsin

g Te

mp.

Sen

sor

for

Indo

or U

nits

a/b

/c/d

/e (G

as P

ipe)

Tc2(

a/b/

c/d/

e):C

onde

nsin

g Te

mp.

Sen

sor

for

Indo

or U

nits

a/b

/c/d

/e (L

iqui

d Pi

pe)

R

P2(

N)F3

0A 2

50VA

CFU

SE

P1(L

)

RL1

P7

P6

P5

P4

P3

W

B

ON

43

21

CN

2C

N3

CN

1

CN

4S

W1

43

21

5

12

34

56

78

ON

SW7

W

W

B

B

0150

5307

41

To In

door

Uni

t A

21

3R

C2

C1 A

BTo central

Controller

OFF

OFF

ON

OFF

Tim

e D

efro

st V

alid

34

CN

1

R

BR

RB

L OR

YW

RB

L OR

YW

RB

L OR

YW

RR

W

WB

WB

W

W

WR

W

WW

BL

YW

BR

R B W

2U20

EH2V

HAS

W5

13

45

67

8

ON

SW

71

23

45

67

8

ON D

efau

lt se

tting

of S

W5 &

SW

7

BR

GG

GG

G

GG

Y/G

Y/G

Y/G

Y/G

WUR

V

BW

+-

BR

BL

Ele

ctro

lytic

Cap

acito

r

Rea

ctor

U V W

AC

NR

I

N(-

)

P(+

)

AC

L

RO

CN

15

Tm

CN

8

BW

W

GR

B

OR

OR W

CN

11

RR

W

CN

2

R

CN34

R

CN

4G

R

BL

BL

RG

RAY

OR

OR

Base

Pan

Hea

ter

Tc

CN

14C

N1

CN

24

TsTa

TdTe

BA

BA

TC

1T

C2

Toci

CN7

WB

WC

N17

BL

R

2

E.E

.V-O

E.E

.V-A

E.E

.V-B

*The

das

hed

part

is o

ptio

nal.

R

Inve

rter P

ower

M

odul

eM

AIN

C

ON

TRO

L B

OA

RD

PO

WER

FILT

ER

BO

AR

D

PM

V-R

EP

MV-

AP

MV-

B

Topic Title


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Wiring Diagrams

3U24EH2VHA

GR

12

34

56

78

SW

3S

W4

SW

2S

W1

CN12LP

HP

CN13

CN9

GN

D

CN11 C

ON

8

CN

8

CN

5

W

TO M

odule

MA

IN C

ON

TRO

L BO

AR

D

M

LED

_GLE

D_R

CN6

4-WAY VALVED

C-F

AN

MO

TO

R

M

250VAC

T5AFU

SE

CO

N9

FGV

spV

cc

CN25

CN16

AC

N

AC

L

ON

43

21

ON

W

W

Vdc

L1L2

Pow

er

CN

2

CN23

CN21

SW

6S

W5

WW

BB

R

CO

MP

RE

SS

OR

Y

M CN17

R

M CN18B

L

M CN15

CRANKCASE HEATER

Definition of S

W6

12

34

OFF

OFF

OFF

OFF

OFF

OFF

OFF

ON

ON

ON

ON

ON

Centralized C

ontrolA

ddress=1A

ddress=2

Address=16

------------------- ---- ---- ----

Definition of S

W1

SW1-1

SW1-2SW

1-3 SW1-4

Norm

al Operating(D

efault)O

FFO

FFO

FFO

FFO

NO

FFO

FFO

FFO

FFO

NO

FFO

FFO

FFO

FFO

NO

FF

Force Heating

Force Cooling

Rated O

perating

To Indoor U

nit C

21

3

To Indoor U

nit B

21

3

OR: Orange B: Black BL: Blue GR:Green R: Red Y/G: Yellow/Green W

: White Y: Yellow BR: Brown

E.E.V:Electro expansion valve

LP/HP:Low /high pressure switch

Toci: Outdoor C

ondensing inlet Temp. sensor

Tc: Outdoor C

ondensing Temperature Sensor

Ts: Com

pressor Suction Temp. Sensor

Ta: Ambient Tem

p. SensorTd: C

ompressor D

ischarge Temp. Sensor

Te: Defrosting Tem

p. SensorTm

: Module Tem

p. SensorTc1(a/b/c/d/e):C

ondensing Temp. Sensor

for Indoor Units a/b/c/d/e (G

as Pipe)Tc2(a/b/c/d/e):C

ondensing Temp. Sensor

for Indoor Units a/b/c/d/e (Liquid Pipe)

RR

P2(N

)

PO

WER

FILTER

BO

AR

D

F30A 250VAC

FUS

EP1(L)

RL1

P7

P6

P5

P4

P3

W

B

ON

43

21

CN

2C

N3

CN

1

CN

4S

W1

43

21

5

12

34

56

78

ON

SW7

W

W

B

B

0150530715

To Indoor U

nit A

21

3 R

C2

C1A

BTo centralcontroller

OFF

OFF

ON

OFF

Time D

efrost Valid

34

CN

1

R

BR

RB

LOR

YW

RB

LOR

YW

RB

LOR

YW

RB

LOR

YW

RR

W

WB

WB

WB

R

W

W

WR

W

W W

BL

YW

BR

RBW

3U24EH2VHAS

W5

13

45

67

8

ON

SW

71

23

45

67

8

ON D

efault setting of SW5 & SW

7

BR

GG

GG

GG

G

GG

Y/G

Y/G

Y/GY/G

Y/G

WU R

V

BW

+ -

BR

BL

Electrolytic

Capacitor

Reactor

UVW

AC

NR

I

N(-)

P(+

)

AC

L

RO

CN

15

Tm

CN

8

BW

W

GR

B

OR

ORW

CN

11

R R

W

CN

2

R

CN34

R

CN

4G

R

BL

BL

RG

RAY

OR

OR Base Pan H

eater

Tc

CN

14C

N1

CN

24

TsTa

TdTe

CB

AC

BA

TC

1T

C2

TociCN7

WB

WC

N17

BL

R

2

PM

V-RE

PM

V-AP

MV-B

PM

V-C

E.E

.V-OE

.E.V-A

E.E

.V-BE

.E.V-C

*The dashed part is optional.

Inverter Pow

er M

odule

Topic Title


ENG

LIS

H

Outdoor/Indoor Wiring Connections

2U20EH2VHA

3U24EH2VHA

Topic Title


ENG

LISH

Sensor Resistance Tables

Model Function PartCode Characteristics

2U20EH2VHA

Gaspipesensor(Tc1) 0150402454M2R25=10KΩ±3%

B25/50=3700K±3%

Liquidpipesensor(Tc2) 0150402454M1R25=10KΩ±3%

B25/50=3700K±3%

Coiltemperaturesensor(Toci) 0010450194R25=10KΩ±3%

B25/50=3700K±3%

Defrost/suction/dischargetemp.sensor

AR06030288A1M

Td:R80=50kΩ±3%

B25/80=4450K±3%

theothers:R25=10KΩ±3%

B25/50=3700K±3%

3U24EH2VHA

Gaspipesensor(Tc1) 0150402454N2R25=10KΩ±3%

B25/50=3700K±3%

Liquidpipesensor(Tc2) 0150402454N1R25=10KΩ±3%

B25/50=3700K±3%

Coiltemperaturesensor(Toci) 0010450194R25=10KΩ±3%

B25/50=3700K±3%

Defrost/suction/dischargingtemp.sensor

AR06030288A1M

Td:R80=50kΩ±3%

B25/80=4450K±3%

theothers:R25=10KΩ±3%

B25/50=3700K±3%

Topic Title


ENG

LIS

H

Sensor Resistance Tables

R25=10KΦ±3%B25/50=3700K±3%T(°C) Rnom(KΦ) T(°C) Rnom(KΦ)-20 90.79 31 7.83-19 85.72 32 7.52-18 80.96 33 7.23-17 76.51 34 6.95-16 72.33 35 6.68-15 68.41 36 5.43-14 64.73 37 5.6-13 61.27 38 5.59-12 58.02 39 5.73-11 54.97 40 5.52-10 52.1 41 5.32-9 49.4 42 5.12-8 46.86 43 4.93-7 44.46 44 4.9-6 42.21 45 4.58-5 40.08 46 4.42-4 38.08 47 4.26-3 36.19 48 4.11-2 34.41 49 3.97-1 32.73 50 3.830 31.14 51 3.71 29.64 52 3.572 28.22 53 3.453 26.4 54 3.334 25.61 55 3.225 24.41 56 3.116 23.27 57 3.117 22.2 58 2.98 21.18 59 2.819 20.21 60 2.7210 19.3 61 2.6311 18.43 62 2.5412 17.61 63 2.4913 16.83 64 2.3814 16.09 65 2.315 15.38 66 2.2316 14.71 67 2.1617 14.08 68 2.0918 13.48 69 2.0319 12.9 70 1.9620 12.36 71 1.921 11.84 72 1.8522 11.34 73 1.7923 10.87 74 1.7324 10.43 75 1.6825 10 76 1.6326 9.59 77 1.5827 9.21 78 1.5428 8.84 79 1.4929 8.48 80 1.4530 8.15

R80=50KΦ±3%B25/80=4450K±3%T(°C) Rnom(KΦ) T(°C) Rnom(KΦ) T(°C) Rnom(KΦ)

-30 11600 1 1775 32 366

-29 10860 2 1680 33 349.3

-28 10170 3 1590 34 333.5

-27 9529 4 1506 35 318.4

-26 8932 5 1426 36 304.1

-25 8375 6 1351 37 290.5

-24 7856 7 1280 38 277.6

-23 7372 8 1214 39 265.3

-22 6920 9 1151 40 253.6

-21 6498 10 1092 41 242.5

-20 6104 11 1036 42 232

-19 5736 12 983.2 43 221.9

-18 5392 13 933.4 44 212.3

-17 5071 14 886.4 45 203.2

-16 4770 15 841.9 46 194.5

-15 4488 16 800 47 186.3

-14 4225 17 760.8 48 178.4

-13 3978 18 722.8 49 170.9

-12 3747 19 687.3 50 163.7

-11 3531 20 653.8 51 155.9

-10 3328 21 622 52 150.4

-9 3138 22 592 53 144.2

-8 2960 23 553.6 54 138.3

-7 2793 24 536.6 55 132.7

-6 2636 25 511.1 56 127.3

-5 2489 26 486.9 57 122.1

-4 2351 27 464 58 117.2

-3 2221 28 442.3 59 112.5

-2 2099 29 421.7 60 108

-1 1984 30 402.1 61 103.8

0 1877 31 383.6 62 99.68

SYJS-04-2019REV.C

www.haierductless.com

GEAppliances,AHaierCompanyAppliancePark,Louisville,KY40225

©2019GEAppliances,AHaierCompanyIssuedDate:May2019

Model#:2U20EH2VHA3U24EH2VHA

ductless multi-split heat pump · 2019-07-12 · connected to the pcb via plugs cn-12(hp) and...

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