Bosch Climate 5000 Series User manual

Bosch DuctlessAirConditioner/HeatPump
Climate5000Series
MultiZoneOutdoorUnits
ServiceManual

2|BoschClimate5000SeriesDuctlessAirConditioner/HeatPumpMultiZoneOutdoorUnits ServiceManual
08.2020|BoschThermotechnologyCorp.Datasubjecttochange

ServiceManual BoschClimate5000SeriesDuctlessAirConditioner/HeatPumpMultiZoneOutdoorUnits |3
BoschThermotechnologyCorp.|08.2020 Datasubjecttochange
TableofContents
1 KeytoSymbolsandSafetyInstructions 4
1.1 KeytoSymbols 4
1.2 Safety 4
2 PartNamesandModelNumbers 6
2.1 OutdoorModels 6
2.2 IndoorModels 6
3 Dimensions 7
3.1 OutdoorUnit 7
4 RefrigerantCycleDiagrams-OutdoorModels 8
4.1 ForModel:18KMultiZoneRegularSystem
BMS500-AAM018-1CSXRA 8
4.2 ForModel:18KMultiZoneHyperHeatSystem
BMS500-AAM018-1CSXHB 8
4.3 ForModels:27KMultiZoneRegular,27KMultiZoneHyperHeat
SystemBMS500-AAM027-1CSXRA,
BMS500-AAM027-1CSXHB 9
4.4 ForModels:36KMultiZoneRegular,36KMultiZoneHyperHeat
SystemBMS500-AAM036-1CSXRA,
BMS500-AAM036-1CSXHB 9
4.5 ForModel:48KMultiZoneRegularSystem
BMS500-AAM048-1CSXRA 10
5 WiringDiagram 10
6 InstallationDetails 11
6.1 TorqueRequirements 11
6.2 ConnectingtheCables 11
6.3 PipeLengthandtheElevation 11
6.4 FirstTimeInstallation 11
6.5 AddingtheRefrigeranttoanExistingSystem 12
6.7 OperationCharacteristics 14
7 ElectronicFunctions 15
7.1 Abbreviation 15
7.2 MainProtection 15
7.4 OperationModesandFunctions 16
8 Troubleshooting 22
8.1 MultiZoneOutdoorUnitErrorCodes 23
8.2 QuickCheckbyErrorCodes 24
8.3 ODUPCB&IPM 25
8.4 OutdoorUnitDisplay 31
8.5 OutdoorWiringDiagram 33
8.6 DiagnosisandSolution 40
9 DisassemblyGuide 71
9.1 OutdoorUnit-BMS500-AAM018-1CSXRA 71
9.2 OutdoorUnit-BMS500-AAM027-1CSXRA,
BMS500-AAM018-1CSXHB,BMS500-AAM027-1CSXHB 76
9.3 OutdoorUnit-BMS500-AAM036-1CSXRA 83
9.4 OutdoorUnit-BMS500-AAM048-1CSXRA,
BMS500-AAM036-1CSXHB 88

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1 Key toSymbolsandSafetyInstructions
1.1 KeytoSymbols
Warnings
WarningsinthisdocumentareidentiÀedbya
warningtriangleprintedagainstagreybackground.
Keywordsatthestartofawarningindicatethetypeandseriousness
oftheensuingriskifmeasurestopreventtheriskarenottaken.
ThefollowingkeywordsaredeÀnedandcanbeusedinthisdocument:
fDANGER indicatesahazardoussituationwhich,ifnotavoided,willresult
indeathorseriousinjury.
fWARNINGindicatesahazardoussituationwhich,ifnotavoided,could
resultindeathorseriousinjury.
fCAUTION indicatesahazardoussituationwhich,ifnotavoided,could
resultinminortomoderateinjury.
fNOTICEisusedtoaddresspracticesnotrelatedtopersonalinjury.
Importantinformation
Thissymbolindicatesimportantinformationwherethereisnoriskto
peopleorproperty.
1.2 Safety
Pleasereadsafetyprecautionsbeforeinstallation
Incorrectinstallationduetoignoringinstructionscancauseseriousdamageor
injury.
WARNING:ELECTRICALHAZARD
fDonotmodifythelengthofthepowersupplycordorusean
extensioncordtopowertheunit.
fDonotsharetheelectricaloutletwithotherappliances.
Improperorinsufficientpowersupplycancausefireor
electricalshock.
WARNING:INSTALLATIONREQUIREMENTS
fInstallationmustbeperformedbyalicensedcontractor,
andpertheinstructionsintheinstallationmanual.Improper
installationcancausewaterleakage,electricalshock,orfire.
fInNorthAmerica,installationmustbeperformedin
accordancewiththerequirementofNEC(NationalElectric
Code)andCEC(CanadianElectricCode)bylicensedand
qualifiedpersonnelonly.
fOnlycontactalicensedcontractorforrepairormaintenance
ofthisunit.
fOnlyusetheincludedaccessories,parts,andspecified
partsforinstallation.Usingnon-standardpartscancause
waterleakage,electricalshock,fire,andcancausetheunit
tofail.
fInstalltheunitinasolidlocationthatcansupporttheunit’s
weight.Ifthechosenlocationcannotsupporttheunit’s
weight,ortheinstallationisnotdoneproperly,theunitmay
dropandcauseseriousinjuryand/ordamage.
WARNING:
fThisproductcanexposeyoutochemicalsincludingLead
andLeadcomponents,whichareknowntotheState
ofCaliforniatocausecancerandbirthdefectsorother
reproductiveharm.Formoreinformationgotowww.
P65Warnings.ca.gov.

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WARNING:ELECTRICALHAZARD
fForallelectricalwork,followalllocalandnationalwiring
standards,regulations,andtheInstallationManual.
Thepowersupplytotheoutdoorunitrequiresaservice
disconnectattheunit. Onlyuseadedicatedcircuit. Never
shareapowersourceconnectedtothissystem.Insufficient
electricalcapacityordefectsinelectricalworkcancause
electricalshockorfire.
fForallelectricalwork,usethespecifiedcables.Connect
cablestightly,andclampthemsecurelytopreventexternal
forcesfromdamagingtheterminal.Improperelectrical
connectionscanoverheatandcausefire,andmayalso
causeshock.
fAllwiringmustbeproperlyarrangedtoensurethatthe
controlboardcovercancloseproperly.Ifthecontrolboard
coverisnotclosedproperly,itcanleadtocorrosionand
causetheconnectionpointsontheterminaltoheatup,
catchfire,orcauseelectricalshock.
fIncertainfunctionalenvironments,suchaskitchens,server
rooms,etc.,theuseofspeciallydesignedair-conditioning
unitsarehighlyrecommended.
fIfthepowersupplycordisdamaged,itmustbereplaced
bythemanufacturer,itsserviceagentorsimilarlyqualified
personssuchasalicensedelectricianinordertoavoida
hazard.
fTheproductmustbeproperlygroundedatthetimeof
installation,orelectricalshockmayoccur.
WARNING:FIRE HAZARD
fForunitsthathaveanauxiliaryelectricheater,donot
installtheunitwithin1meter(3feet)ofanycombustible
materials.
fDonotinstalltheunitinalocationthatmaybeexposed
tocombustiblegasleaks.Ifcombustiblegasaccumulates
aroundtheunit,itmaycausefire.
fDonotoperateyourairconditionerinawetroomsuchasa
bathroomorlaundryroom.Toomuchexposuretowatercan
causeelectricalcomponentstoshortcircuit.
NOTICE:PROPERTYDAMAGE
fInstallcondensatedrainagepipingaccordingtothe
instructionsinthismanual.Impropercondensatedrainage
maycausewaterdamagetoyourhomeandproperty.
CAUTION:CONTAINS REFRIGERANT
fThisair-conditioningunitcontainsfluorinatedgases.For
specificinformationonthetypeofgasandtheamount,
pleaserefertotherelevantlabelontheoutdoorunititself.
fInstallation,service,maintenanceandrepairofthisunit
mustbeperformedbyacertifiedtechnician.
fProductremovalandrecyclingmustbeperformedbya
certifiedtechnician.
fIfthesystemhasaleak-detectionsysteminstalled,itmust
becheckedforleaksatleastevery12months.
fWhentheunitischeckedforleaks,properrecord-keepingof
allchecksisrequired.

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2 PartNamesandModelNumbers
2.1 OutdoorModels
Voltage Capacity MaxZone RegularOutdoorUnits HyperHeatOutdoorUnits
208-230V
18K 2 BMS500-AAM018-1CSXRA BMS500-AAM018-1CSXHB
27K 3 BMS500-AAM027-1CSXRA BMS500-AAM027-1CSXHB
36K 4 BMS500-AAM036-1CSXRA BMS500-AAM036-1CSXHB
48K 5 BMS500-AAM048-1CSXRA ȉ
Table 1
2.2 IndoorModels
Voltage Capacity WallMountedIndoorUnits 4-WayCassetteIndoorUnits DuctedIndoorUnits
208-230V
9K BMS500-AAU009-1AHWXB BMS500-AAU009-1AHCXB BMS500-AAU009-1AHDXB
12K BMS500-AAU012-1AHWXB BMS500-AAU012-1AHCXB BMS500-AAU012-1AHDXB
18K BMS500-AAU018-1AHWXB BMS500-AAU018-1AHCXB BMS500-AAU018-1AHDXB
24K BMS500-AAU024-1AHWXB BMS500-AAU024-1AHCXB BMS500-AAU024-1AHDXB
Table 2
ForIndoorUnits,pleaserefertoIndoorUnitServiceManual.

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3 Dimensions
3.1 OutdoorUnit
Splittypeoutdoorunitmountingdimensions
Figure 1
Split Type Outdoor Unit
H
W
W
H
A
B
D
OutdoorModel OutdoorUnitDimensionsmm(in.)
WxHxD
MountingDimensions
mm(in.)
DistanceA DistanceB
BMS500-AAM018-1CSXRA 845x702x363(33.27x27.6x14.3) 540(21.26) 350(13.8)
BMS500-AAM027-1CSXRA,
BMS500-AAM027-1CSXHB,
BMS500-AAM036-1CSXRA,
BMS500-AAM036-1CSXHB
946x810x410(37.24x31.9x16.14) 673(26.5) 403(15.87)
BMS500-AAM036-1CSXHB,
BMS500-AAM048-1CSXRA 952x1333x415(37.5x52.5x16.34) 634(24.96) 404(15.9)
Table 3

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4 RefrigerantCycleDiagrams-OutdoorModels
4.1 ForModel:18KMultiZoneRegularSystem
BMS500-AAM018-1CSXRA
Figure 2
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
Compressor
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
middle
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T5 Discharge
temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
EXV A CAPILLARY A
CHECK VALVE
CAPILLARY TUBE
EXV B CAPILLARY B
LIQUID VALVE B
GAS VALVE B
Accumulator
T2B-A Evaporator
temp. sensor outlet
T2B-B
4.2 ForModel:18KMultiZoneHyperHeatSystem
BMS500-AAM018-1CSXHB
Figure 3
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
Compressor
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
middle
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T5 Discharge
temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
EXV A CAPILLARY A
CHECK VALVE
CAPILLARY TUBE
EXV B CAPILLARY B
LIQUID VALVE B
GAS VALVE B
Accumulator
T2B-A Evaporator
temp. sensor outlet
T2B-B

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4.3 ForModels: 27K Multi ZoneRegular,27KMultiZoneHyperHeat
SystemBMS500-AAM027-1CSXRA,BMS500-AAM027-1CSXHB
Figure 4
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
Compressor
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
middle
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T5 Discharge
temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
EXV A CAPILLARY A
CHECK VALVE
CAPILLARY TUBE
EXV B CAPILLARY B
LIQUID VALVE B
GAS VALVE B
EXV C CAPILLARY C
LIQUID VALVE C
GAS VALVE C
Accumulator
T2B-A Evaporator
temp. sensor outlet
T2B-B
T2B-C
4.4 ForModels:36KMultiZoneRegular,36KMultiZoneHyperHeat
SystemBMS500-AAM036-1CSXRA, BMS500-AAM036-1CSXHB
Figure 5
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
Compressor
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
middle
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T5 Discharge
temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
EXV A CAPILLARY A
CHECK VALVE
CAPILLARY TUBE
EXV B CAPILLARY B
LIQUID VALVE B
GAS VALVE B
EXV C CAPILLARY C
LIQUID VALVE C
GAS VALVE C
EXV D CAPILLARY D
LIQUID VALVE D
GAS VALVE D Accumulator
High pressure
switch
Low pressure
switch
T2B-A Evaporator
temp. sensor outlet
T2B-B
T2B-C
T2B-D

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4.5 ForModel:48KMultiZoneRegularSystem
BMS500-AAM048-1CSXRA
Figure 6
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR) HEAT
EXCHANGE
(CONDENSER)
COOLING
HEATING
T2 Evaporator
temp. sensor
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
EXV A CAPILLARY A
CHECK VALVE
CAPILLARY TUBE
EXV B CAPILLARY B
LIQUID VALVE B
GAS VALVE B
EXV C CAPILLARY C
LIQUID VALVE C
GAS VALVE C
EXV D CAPILLARY D
LIQUID VALVE D
GAS VALVE D
EXV E CAPILLARY E
LIQUID VALVE E
GAS VALVE E
Compressor
4-WAY VALVE
T5 Discharge
temp. sensor
Accumulator High pressure
switch
Low pressure
switch
T2B-A Evaporator
temp. sensor outlet
T2B-B
T2B-C
T2B-D
T2B-E
5 WiringDiagram
Refertowiringdiagramintheinstallationmanual(IOM)orontheunit.

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6 InstallationDetails
6.1 Torque Requirements
OuterDiameterofTube
mm(in.) TighteningTorque N•m(lbft) Max.Tightening TorqueN•m(lbft)
Ø6.35(Ø0.25”) 1,500(11lb•ft) 1,600(11.8lb•ft)
Ø9.52(Ø0.375”) 2,500(18.4lb•ft) 2,600(19.18lb•ft)
Ø12.7( Ø0.5”) 3,500 (25.8lb•ft) 3,600 (26.55lb•ft)
Ø15.9(Ø0.625”) 4,500 (33.19lb•ft) 4,700 (34.67lb•ft)
Table 4
6.2 ConnectingtheCables
ThepowercordshouldbeselectedaccordingtothefollowingspeciÀcationssheet.
fCabletype:SOOWtype
ApplianceAmps AWGWireSize
10 18
13 16
18 14
25 12
30 10
Table 5
Thecablesizesaredeterminedbythemaximumcurrentindicatedonthenameplate
whichislocatedonthesidepaneloftheunit.Pleaserefertothenameplatebefore
selectingthecable,fuseandswitch.Ameansofdisconnectingthepower,should
bewithin10feetoftheoutdoorunit.
6.3 PipeLengthandtheElevation
RegularMultiZoneODU
Capacity Pipesize
Liquidside
(in/mm) Gasside (in/mm)
18k 2x1/4"/2xƁ6.35 2x3/8"/2xƁ9.52
27k 3x1/4"/3xƁ6.35 3x3/8"/3xƁ9.52
36k 4x1/4"/4xƁ6.35 4x3/8"/4xƁ9.52
48k 5x1/4"/5xƁ6.35 3x3/8"+2x1/2"
3xƁ9.52+2xƁ12.7
Table 6
HyperHeatMultiZoneODU
Capacity Pipesize
Liquidside
(in/mm) Gasside (in/mm)
18k 2x1/4"/2xƁ6.35 2x3/8"/2xƁ9.52
27k 3x1/4"/3xƁ6.35 3x3/8"/3xƁ9.52
36k 4x1/4"/4xƁ6.35 3x3/8"+1x1/2"
3xƁ9.52+1xƁ12.7
Table 7
6.4 FirstTimeInstallation
6.4.1 AirPurgingwithVacuumPump
Figure 7
(Indoor Unit) (Liquid Side)
(Gas Side)
(Outdoor Unit)
Liquid Service Line
Gas Service Line
Manifold Valve
Compound Meter Pressure
Gauge
Handle Lo Handle Hi
-0.1MPa
Shut-Off Knob
Low Refrigerant
Manifold/Blue
Shut-Off Knob High
Charge/Refrigerant Hose
Vacuum
Pump
1. CompletelytightentheÁarenutsoftheindoorandoutdoorunits,conÀrm
thatboththeliquidserviceandgasservicevalvesaresettotheclosed
position.
2. Connecttherefrigerantmanifold;bluehosewiththeshut-offknobofthelow
sidetothegasservicevalveport.
3. Connecttherefrigerantmanifold;yellowhosetotheshut-offhighside
connectiontothevacuumpump.
4. Fullyopentheshut-offknoblowsideofthemanifoldvalve.
5. Operatethevacuumpumptoevacuate.
6. Performevacuationfor30minutesandcheckwhethertherefrigeration
lowsidepressuregaugeindicates350~500microns.Ifthemeterdoes
notindicate350~500micronsafterevacuatingfor30minutes,itshould
beevacuated20minutesmore.Ifthepressurecan’thold350~500
micronsafterevacuating50minutes,pleasecheckifthereareanyleakage
points.Fullyclosetheshut-offknoblowsideofthemanifoldandstopthe
operationofthevacuumpump.ConÀrmthatthegaugeneedledoesnotmove
(approximately5minutesafterturningoffthevacuumpump).
7. Makesurethepressuredisplayinthepressureindicatorisalittlehigherthan
theatmosphericpressure.Thenremovethechargehosefromthegasservice
valve.
8. Fullyopentheliquidservicevalveandgasservicevalveandsecurelytighten
thecapofthegasservicevalve.Systemisnowevacuatedandcharged.
(EnsurethattheunitischargedperthedeÀnedspeciÀcations).
Gasleakcheck:
—Requiredaftercompletionofrefrigerantlinesetinstallation
—Unitservicevalvesremainclosedtoisolaterefrigerantinto
outdoorunit(condensingsection)
—Linesetandcoilshouldbepressurizedtoatleast150PSIG
usingdryNitrogen
—Checkforleaksusingbubblesolutionateachbrazejoint

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6.5 AddingtheRefrigeranttoan ExistingSystem
Figure 8
(Indoor Unit) (Liquid Side)
(Gas Side)
(Outdoor Unit)
Liquid Service Line
Gas Service Line
Check Valve
Refrigerant
Cylinder
Electronic Scale
OPEN CLOSE
Procedure
1. Connecttherefrigerantmanifold,bluesuctionhosetothegasservicevalve's
serviceport,opentheliquidservicevalveandthegasservicevalve.Connect
therefrigerantmanifold,yellowhosetothevalveatthetoporbottomofthe
cylinder.IftherefrigerantisR410A,ensurethatcylinderisplacedupside
downduringthechargingprocess.
2. Purgetheairfromtherefrigerantmanifold(yellowhose).Openthevalveat
thetoporbottomofthecylinderandpressthecheckvalveontherefrigerant
manifoldtopurgetheair.
CAUTION:CONTAINS REFRIGERANT
fLiquidrefrigerantcancausefrostbite.Handlewithcare.
3. Placetherefrigerantcylinderontotheelectronicscaleandrecordtheweight.
4. Operatetheairconditionerincoolingmode.
5. Openthevalve(lowside)ontherefrigerantmanifoldandchargethesystem
withliquidrefrigerant.
6. Whentheelectronicscaledisplaystheproperweight(refertothegaugeand
thepressureofthelowside),turnofftherefrigerantlowsidevalveandthe
refrigerantcylindervalve.Thenturnofftheunittoremovethehosefromthe
gasservicevalve.
7. Replacevalvestemcapsontheserviceport.Useatorquewrenchtotighten
theserviceportcaptoatorqueof18N.m. Besuretocheckforgasleakage.
RecovertherefrigerantasperRefrigerantRecoveryandRecycling
Equipmentmanufacturers'speciÀcation.
Refrigerantcharging
Figure 9
(Indoor Unit) (Liquid Side)
(Gas Side)
(Outdoor Unit)
Liquid Service Line
Gas Service Line
Open
Check Valve
Open
Electronic Scale
CLOSE
OPEN
Refrigerant
Cylinder
Procedure:
1. Connectthechargehosetotherefrigerentcylinder,opentheliquidand
thegasservicevalves.Connectthechargehosewhichyoudisconnected
fromthevacuumpumptothevalveatthetoporbottomofthecylinder.If
therefrigerantisR410A,makethecylinderisupsidedowntoensureliquid
charge.
2. Purgetheairfromthechargehose.Openthevalveatthebottomofthe
cylinderandpressthecheckvalveonthechargesettopurgetheair(be
carefuloftheliquidrefrigerant).
3. Putthechargingcylinderontotheelectronicscaleandrecordtheweight.
4. Openthevalves(Lowside)ontherefrigerantmanifoldandchargethe
systemwithliquidrefrigerant.Ifthesystemcannotbechargewiththe
speciÀedamountofrefrigerant,orcanbechargedwithalittleatatime
(approximately150geachtime),operatingtheairconditionerinthecooling
cycle;however,ifonetimeisnotsufÀcient,waitapproximately1minuteand
thenrepeattheprocedure.
5. Whentheelectronicscaledisplaystheproperweight,disconnectthecharge
hosefromthegasservicevalve’sserviceportimmediately.Ifthesystemhas
beenchargedwithliquidrefrigerantwhileoperatingtheairconditioner,turn
offtheairconditionerbeforedisconnectingthehose.
6. Replacevalvestemcapsontheserviceport.Useatorquewrenchtotighten
theserviceportcaptoatorqueof18N.m.Besuretocheckforgasleakage.

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Formodels:BMS500-AAM027-1CSXRA,BMS500-AAM036-1CSXRA,
BMS500-AAM048-1CSXRA,BMS500-AAM018-1CSXHB,BMS500-AAM027-
1CSXHB,BMS500-AAM036-1CSXHB
Forabovemodels,thereisasetofmastervalve,whichwillallowinstallertovacuum
andrecycletherefrigerantatafasterspeed.Ensuremastervalvesarefullyopen
priortosystemoperation.
Figure 10

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6.7 OperationCharacteristics
COOLoperation HEAToperation DRY operation
RoomTemperature 63ºF-90ºF
17ºC-32ºC 32ºF-86ºF 0ºC-30ºC 50ºF-90ºF 10ºC-32ºC
Outdoor
Temperature
Regular
BMS500-AAM018-1CSXRA
BMS500-AAM027-1CSXRA
BMS500-AAM036-1CSXRA
BMS500-AAM048-1CSXRA
-25ºC-50ºC
-13ºF-122ºF -25ºC-30ºC -13ºF-86ºF 0ºC-50ºC 32ºF-122ºF
HyperHeat BMS500-AAM018-1CSXHB BMS500-AAM027-1CSXHB
BMS500-AAM036-1CSXHB
-30ºC-50ºC
-22ºF-122ºF -30ºC-30ºC -22ºF-86ºF 0ºC-50ºC 32ºF-122ºF
Table 8
EquationtoconvertCelsiustoFahrenheit
(°F)=1.8x(°C)+32
NOTICE:
fIfthesystemisusedbeyondtheaboveconditions,certain
safetyprotectionfeaturesmaycomeintooperationand
causetheunittooperateabnormally.
NOTICE:
fTheroomrelativehumidityshouldbelessthan80%.Ifthe
airconditioneroperatesbeyondthisfigure,thesurfaceof
theairconditionermayattractcondensation.Pleasesetthe
verticalairflowlouvertoitsmaximumangle(verticallytothe
floor),andsetto HIGHfanmode.
fTheoptimumperformancewillbeachievedduringthis
operatingtemperaturezone.

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7 ElectronicFunctions
7.1 Abbreviation
T1:Indoorroomtemperature
T2:Coiltemperatureofevaporator
T3:Coiltemperatureofcondenser
T4:Outdoorambienttemperature
T5:Compressordischargetemperature
Ts: Roomtemperaturesetting
Td:Off-setvalue(Tdisanadvancedfeature)
T2b-A:SuctiontempforzoneAincooling(dischargetempforeachzoneinheating)
T2b-B:SuctiontempforzoneBincooling(dischargetempforeachzoneinheating)
T2b-C:SuctiontempforzoneCincooling(dischargetempforeachzoneinheating)
T2b-D:SuctiontempforzoneDincooling(dischargetempforeachzoneinheating)
T2b-E:SuctiontempforzoneEincooling(dischargetempforeachzoneinheating)
7.2 MainProtection
7.2.1 Threeminutesdelayatrestartforcompressor
1minutedelayforthe1sttimestart-upand3minutesdelayforothers.
7.2.2 Temperatureprotectionofcompressordischarge
Whenthedischargetemperatureofthecompressorrises,theoperationfrequency
islimitedaccordingtothefollowingrules:
fIf105°C(221°F)T5<110°C(230°F),maintainthecurrent
frequency.
fIfthetemperatureincreasesandT5110°C(230°F),decreasethe
frequencytoalowerlevelevery2minutestoF1.
fIfT5115°C(239°F)for10seconds,thecompressorstopsandthen
restartuntilT5<90°C(194°F).
7.2.3 Fanspeedisoutofcontrol
Ifoutdoorfanspeedislowerthan100RPMorhigherthan2400RPMfor60
secondsormore,theunitstopsandLEDdisplaysE8failurecode.
7.2.4 Invertermodule protection
TheInvertermodulehasaprotectionfunctionforcurrent,voltageandtemperature.
Iftheseprotectionshappen,thecorrespondingcodewilldisplayontheindoor
unitandtheunitwillstopworking.Theunitrestarts3minutesaftertheprotection
mechanismhasturnedoff.
7.2.5 Lowvoltageprotection
Iflowvoltageprotectiontriggersandvoltageisnotrestoredtonormalwithin3
minutes,theprotectionremainsactiveevenafteramachinerestart.
7.2.6 Compressorcurrentlimitprotection
ThetemperatureintervalforthecurrentlimitisthesameastherangeoftheT4
frequencylimit.
Coolingmode:
Figure 11
ć
&RRO7=RQH,
50
49
45
&RRO7=RQH,
44
41
40
&RRO7=RQH,
33
32
&RRO7=RQH,
CoolReturnI The difference between current limit and shutdown current
CoolT4Zone5I Cooling T4ı50ćcurrent limit value
CoolT4Zone4I Cooling 49˚T4ı45ćcurrent limit value
CoolT4Zone3l
Cooling 44˚T4ı41ćcurrent limit value
CoolT4Zone2l Cooling 40ηT4ı33ćcurrent limit value
CoolT4Zone1l Cooling 32˚T4ćcurrent limit value
CoolStopI
Cooling stop protection current value
Heatingmode:
Figure 12
ć

 +HDW7=RQH,

 +HDW7=RQH,

 +HDW7=RQH,
+HDW7=RQH,
HeatReturnI The difference between current limit and shutdown current
HeatT4Zone4I Heating T4ı15ćcurrent
limit value
HeatT4Zone3I Heating 14˚T4ı10ćcurrent
limit value
HeatT4Zone2l Heating 9˚T4ı6ćcurrent
limit value
HeatT4Zone1l Heating 5
HeatStopl Heating stop protection current
˚T4ćcurrent limit value

16|BoschClimate5000SeriesDuctlessAirConditioner/HeatPumpMultiZoneOutdoorUnits ServiceManual
08.2020|BoschThermotechnologyCorp.Datasubjecttochange
7.2.7 Indoor/outdoorunitscommunicationprotection
Iftheindoorunitsdonotreceivethefeedbacksignalfromtheoutdoorunitsfor2
consecutiveminutes,theunitstops.Theunitdisplaysthefailurecode.
7.2.8 HighCondenserCoilTemperatureProtection
Figure 13
T3
Resume
Off
Decrease
Hold
fIf55°C<T3<60°C,thecompressorfrequencywilldecreasetothelower
leveluntil F1andthenrunsatF1.IfT3<54°C,thecompressorwillkeep
runningatthecurrentfrequency.
fIfT3<52°C,thecompressorwillnotlimitthefrequencyandresumeto
theformerfrequency.
fIfT3>60°Cfor5seconds,thecompressorwillstopuntilT3<52°C.
7.2.9 OutdoorUnitAnti-FreezingProtection
WhenT2<4°Cfor250secondsorT2<0°C,theindoorunitcapacitydemand
willbekeptatzero.ThesystemresumesnormaloperationwhenT2>8°Candthe
protectiontimeisnolessthan3minutes.
7.2.10 OilReturn
1. Ifthecompressorfrequencycontinuestobelowerthanthesetfrequency
(35Hz)forabout120minutes,theunitraisesthefrequencyto60Hzfor
about100secondsandthenresumeswiththeformerfrequency.
2. TheEXVcontinuesat300pulsewhileindoorunitsmaintaintheiroperation.
7.2.11 LowOutdoorAmbientTemperatureProtection
fWhenthecompressorisoffandT4islowerthan-35°Cfor10seconds,
theunitstopsanddisplays“LP.”
fWhenthecompressorisonandT4remainslowerthan-40°Cfor10
seconds,theunitstopsanddisplays“LP.”
fWhenT4ishigherthan-32°Cfor10seconds,theunitexitsprotection.
7.4 OperationModesandFunctions
7.4.1 CapacityRequestCalculation
TotalcapacityRequest=ž(Normcode×HP)/40×modifyrate+correction
CoolingMode:
Figure 14
T1 Ts
3
1
1
e
c
a4
2
0
2
3
0
1
f
d
b
Capacity area
Norm code (N)
Capacity area a b c d e f
3 2 1.5 1 0.5 0
Model 9K 12K 18K 24K
HP 1.0 1.2 1.5 2.5
Table 9
TheÀnalresultisaninteger.
Usethefollowingtable andÀnalcapacityrequesttoconÀrmtheoperating
frequency.
Frequency(Hz) 0 COO
L_F1 COO L_F2 --- --- COO
L_F2
4
COO
L_F2
5
Amendatory
capacitydemand. 01 1 ---
--- 24 25
Table 10

ServiceManual BoschClimate5000SeriesDuctlessAirConditioner/HeatPumpMultiZoneOutdoorUnits |17
BoschThermotechnologyCorp.|08.2020 Datasubjecttochange
Themaximumrunningfrequencyisadjustedaccordingtotheoutdoorambient
temperature.
Figure 15
ć


)PD[ T4FREMAXC0


)PD[ 7)5(0$;&


)PD[ 7)5(0$;&


)PD[ 7)5(0$;&


)PD[ 7)5(0$;&


)PD[ 7)5(0$;&


)PD[ 7)5(0$;&


)PD[ 7)5(0$;&


)PD[ 7)5(0$;&


)PD[ 7)5(0$;&
)PD[ 7)5(0$;&
HeatingMode:
Figure 16
T1 Ts
4
0
a
3
1
-1
3
1
2
0
b
c
d
e
f
2
Capacity area
Norm code (N)
Capacity area a b c d e f
32
1.5 1 0.5 0
Model 9K 12K 18K 24K
HP 1.0 1.2 1.5 2.5
Table 11
TheÀnalresultisaninteger.
Thenmodifyitaccordingtoa T2average (correction):
Figure 17
ć
7DYHUDJH
'HFUHDVHIUHTXHQF\

.HHSIUHTXHQF\

,QFUHDVHIUHTXHQF\
Usethefollowingtable andÀnalcapacityrequesttoconÀrmtheoperating
frequency.
Frequency(Hz) 0 COO
L_F1 COO L_F2 --- --- COO
L_F2
4
COO
L_F2
5
Amendatory
capacitydemand. 01 1 ---
--- 24 25
Table 12
Themaximumrunningfrequencyisadjustedaccordingtotheoutdoorambient
temperature.
Figure 18
ć


6WDQGE\

 )PD[ 7)5(+($70$;

 )PD[ 7)5(+($70$;

 )PD[ 7)5(+($70$;

 )PD[ 7)5(+($70$;

 )PD[ 7)5(+($70$;

 )PD[ 7)5(+($70$;

 )PD[ 7)5(+($70$;

 )PD[ 7)5(+($70$;

 )PD[ 7)5(+($70$;

 )PD[ )

 )PD[ )

 )PD[ )

 )PD[ )
)PD[ )

18|BoschClimate5000SeriesDuctlessAirConditioner/HeatPumpMultiZoneOutdoorUnits ServiceManual
08.2020|BoschThermotechnologyCorp.Datasubjecttochange
7.4.2 DefrostControl
ConditionsforDefrostMode:
Afterthecompressorstartsandentersnormaloperation,marktheminimumvalue
ofT3fromthe10thto15thminuteasT30.
IfanyoneofthefollowingconditionsissatisÀed,theunitentersdefrostmode:
1. Ifthecompressor’scumulativerunningtimereaches29minutesandT3<
TCDI1andT3+T30SUBT3ONET30.
2. Ifthecompressorcumulativerunningtimereaches35minutesandT3<
TCDI2andT3+T30SUBT3TWOT30.
3. Ifthecompressorcumulativerunningtimereaches40minutesandT3<
-24°Cfor3minutes.
4. Ifthecompressorcumulativerunningtimereaches120minutesandT3<
-15°C.
DefrostStopConditions
IfanyoneofthefollowingconditionsissatisÀed,defrostmodeendsandtheunit
returnstonormalheatingmode:
fT3risesabovethanTCDE1°C.
fT3remainsatTCDE2°Corabovefor80seconds.
fThemachinerunsfor10consecutiveminutesindefrostmode.
DefrostingAction:
Figure 19
off
on
Cool
-F9
10S
30S
TimeA
10S
4-w a y val ve
defrosng
Defrosng over
compressor
Indoor fan
Outdoor fan
EXV open
frequency
Max10 minutes
frequency
Compressor stops
off
An
-cold control
off
480P
480P for 240s
Conditionofendingdefrosting:
IfanyoneoffollowingitemsissatisÀed,defrostmodewillstopandthemachinewill
returntonormalheatingmode.
fT3>TempQuitDefrost_ADD°C;.
fDefrostmoderunsfor10minutes
TempQuitDefrost_ADD isslightlydifferentdependingonoutdoor
models,butisabout12ÝC(54ÝF).
7.4.3 OutdoorFanControl
7.4.3.1 CoolingMode
Undernormaloperatingconditions,thesystemchoosestherunningfanspeed
accordingtotheambienttemperature:
Figure 20
ć


6XSHUKLJKIDQVSHHG

 +LJKIDQVSHHG


0LGGOHIDQVSHHG


/RZIDQVSHHG


6XSHUORZIDQVSHHG


%UHH]HIDQVSHHG

 )IDQVSHHG


*IDQVSHHG


+IDQVSHHG
,IDQVSHHG
2XWGRRUWHPSHUDWXUH
Lowambientcoolingmodelogic:
fWhenT4<15°C(59°F)andT3<30°C(86°F),theunitentersintolow
ambientcoolingmode.TheoutdoorfanchoosesaspeedaccordingtoT3.
fWhenT338°C(100.4°F)orwhenT420°C(68°F),theoutdoorfan
choosesaspeedaccordingtoT4again.
Figure 21
38
Exit low ambient cooling
mode,run with high fan
for 1 minute
Low
30
27
23
off

ServiceManual BoschClimate5000SeriesDuctlessAirConditioner/HeatPumpMultiZoneOutdoorUnits |19
BoschThermotechnologyCorp.|08.2020 Datasubjecttochange
Figure 22
7
,QFUHDVHIDQVSHHGLQFUHDVH
.HHSFXUUHQWIDQVSHHG
'HFUHDVHIDQVSHHG
)DQVWRS
/RZ&RRO7B21
/RZ&RRO7B'RZQ
/RZ&RRO7B2))
7.4.3.2 HeatingMode
Undernormaloperatingconditions,thesystemchoosesarunningfanspeed
accordingtoambienttemperature:
Figure 23
2XWGRRUWHPSHUDWXUHć

%UHH]HIDQVSHHG


6XSSHUORZIDQVSHHG


/RZIDQVSHHG


0LGGOHIDQVSHHG


+LJKIDQVSHHG

6XSSHUKLJKIDQVSHHG
7.4.4 ElectronicExpansionValve(EXV)Control
1. EXVremainsfullyclosedwhilethedeviceispoweringup.EXVthenremains
onstandbywith350pulseopen.Itopenstothetargetangleafterthe
compressorstarts.
2. EXVcloseswith-160pulsewhenthecompressorstops.Thenitremains
onstandbywith350pulseopen.Itopenstothetargetangleafterthe
compressorstarts.
3. TheactionpriorityfortheEXVsisA-B-C-D-E.
4. ThecompressorandoutdoorfancommenceoperationonlyafterEXV
initializes.
7.4.4.1 CoolingMode
TheinitialopenangleoftheEXVdependsonthesizeoftheindoormodel.The
adjustmentrangeis100pulse-400pulse.
Whentheunithasbeenrunningfor3minutes,theoutdoorreceivesindoorunits'
capacitydemandandT2Binformationandthencalculatestheiraverage.After
comparingeachindoor’sT2Bwiththeaverage,theoutdoorgivesthefollowing
modiÀcationcommands:
fIfT2B>average,therelevantvalveneedstoopen16Pmore
fIfT2B=average,therelevantvalve’sopenrangeremainsasis
fIfT2B<average,therelevantvalveneedstoclose16Pmore
ThismodiÀcationiscarriedoutevery2minutes.
7.4.4.2 HeatingMode
TheinitialopenangleoftheEXVdependsonthesizeoftheindoormodel.The
adjustmentrangeis150pulse-350pulse.
Whentheunithasbeenrunningfor3minutes,theoutdoorunitreceivestheindoor
unitscapacitydemandandT2informationandthencalculatestheiraverage.
Aftercomparingeachindoorunit’sT2withtheaverage,theoutdoorgivesthe
followingmodiÀcationcommands:
fIfT2>average+2,therelevantvalveneedstoclose16Pmore
fIfaverage+2T2average-2,relevantvalve’sopenrangeremainsasis
fIfT2<average-2,therelevantvalveneedstoopen16Pmore
ThismodiÀcationiscarriedoutevery2minutes.
7.4.5 Four-WayValveControl
Inheatingmode,thefour-wayvalveisopened.
Indefrostmode,thefour-wayvalveoperatesaccordingtothecurrentdefrosting
action.
Inothermodes,thefour-wayvalveisclosed.
Whentheunitisswitchedfromheatingtoothermodes,thefour-wayvalveturnsoff
afterthecompressorhasbeenofffor2consecutiveminutes.
Failureorprotection(excludingdischargetemperatureprotectionandhigh/low
pressureprotection)causesthefour-wayvalvetoimmediatelyshutdown.

20|BoschClimate5000SeriesDuctlessAirConditioner/HeatPumpMultiZoneOutdoorUnits ServiceManual
08.2020|BoschThermotechnologyCorp.Datasubjecttochange
7.4.6 Pointcheckfunction(engineeringtroubleshootingmode)
PresstheLEDDISPLAYorLEDorMUTEbuttonoftheremotecontrollerthree
times,andthenpresstheAIRDIRECTIONorSWINGbuttonthreetimesinten
seconds,thebuzzerwillkeepringfortwoseconds.Theairconditionerwill
enterintotheinformationenquirystatus.YoucanpresstheLEDDISPLAYorAIR
DIRECTIONbuttontocheckthenextorfrontitem’sinformation.
WhentheACenterthe“informationenquiry”status,itwilldisplaythecodename
for2seconds,thedetailsareasfollows.
Enquiryinformation Displayingcode Meaning
T1 T1 Indoorroomtemperature
T2 T2 Coiltemperatureofevaporator
T3 T3 Coiltemperatureofcondenser
T4 T4 Outdoorambienttemperature
T2B Tb Coiltemperatureofevaporator
TP TP Compressordischargetemperature
TH TH Compressorsuctiontemperature
TargetedFrequency FT TargetedFrequency
ActualFrequency FR ActualFrequency
Indoorfanspeed IF Indoorfanspeed
Outdoorfanspeed OF Outdoorfanspeed
EXVopeningangle LA EXVopeningangle
Compressorcontinuousrunningtime CT Compressorcontinuousrunningtime
Causesofcompressorstop. ST Causesofcompressorstop.
Reserve A0
Reserve A1
Reserve 0
Reserve 1
Reserve 2
Reserve 3
Reserve 4
Reserve 5
Reserve 6
Reserve L
Reserve A
Reserve U
Reserve T
Table 13