York VRF Single Change-Over Box Installation guide

York
Brand
York
Model
VRF Single Change-Over Box
Category
Split-system air conditioners
Type
Installation guide
P5417011
Models:
COBS048B22C
COBS096B22C
Installation
Manual
for
Cooling / Heating
Change-Over Box
IMPORTANT:
READ AND UNDERSTAND
THIS MANUAL
CAREFULLY
BEFORE INSTALLING
THIS CHANGE-OVER BOX.
KEEP THIS MANUAL FOR
FUTURE REFERENCE.
P5417011-rev.2
i
4
: Available
×
: Not Available
● SinglePortChange-overboxmodels[COBS_B21S(C)]arebeingdiscontinued.However,theywillbe
suppliedforservicingandmaintenanceuntilfurthernotice.Ifthereisaneedforareplacementorpartsfor
theSinglePortChange-overboxmodels[COBS_B21S(C)],pleasecallTechSupportat:1-844-873-4445
(option2).
1.Notavailableforwatersourceunit.
Change-OverBox
(Example:COBS048B21C)
VRF(HeatRecovery)
(Example:(H,Y)VAHR072B31S)
VRF(HeatRecovery)
1
(Example:(H,Y)VAHR072B32S)
Change-OverBox
(Example:COBS048B22C)
4
4
4
4
4
4
×
×
Compatibility for Single Port Change-over box models [COBS_B21S(C)],
Single Port Change-over box models [COBS_B22S(C)],
and Multi Port Change-over box models (COBS_M_B22S)
● SinglePortChange-overboxmodels[COBS_B22S(C)],MultiPortChange-overboxmodels
(COBS_M_B22S),andSinglePortChange-overboxmodels[COBS_B21S(C)]cannotoperateinthe
samesystemtogether.
● SinglePortChange-overboxmodels[COBS_B22S(C)]andMultiPortChange-overboxmodels
(COBS_M_B22S)areonlycompatiblewiththeoutdoorunits[(H,Y)VAHR_B3(4)2S]andthewatersource
units[(H,Y)VWHR_B(3,4)2S].
ThewiredcontrollerwilldisplaythealarmcodeC4andtheoutdoorunits[(H,Y)VAHR_B3(4)1S]willnot
operateiftheSinglePortChange-overboxmodels[COBS_B22S(C)]andMultiPortChange-overbox
models(COBS_M_B22S)aremismatchedwithoutdoorunits[(H,Y)VAHR_B3(4)1S].
● SinglePortChange-overboxmodels[COBS_B21S(C)]arecompatiblewithboththeoutdoorunits
[(H,Y)VAHR_B3(4)1S]and[(H,Y)VAHR_B3(4)2S]withlimitations.
SinglePortChange-overboxmodels[COBS_B21S(C)]arenotcompatiblewiththewatersourceunit.
Thewiredcontrollerwilldisplaythealarmcode30andtheunitswillnotoperateiftheSinglePort
Change-overboxmodels[COBS_B21S(C)]aremismatchedwithawatersourceunit.
RefertotheHeatRecoveryInstallationandMaintenanceManualformoredetails.
ii
P5417011-rev.2
IMPORTANT NOTICE
● Theapplicableoutdoorunitmaybedierentdependingontheproductseries.
Impropercombinationcausestheunittomalfunctionandanalarmwillbetriggered.Besuretoconrm
withtheproductcataloguebeforeinstallation.
● JohnsonControlspursuesapolicyofcontinuousimprovementinthedesignandperformanceofproducts
tomeetregulatoryrequirementsandindustrystandards.Therefore,JohnsonControlsreservestheright
torevisespecicationswithoutnotice.
● JohnsonControlscannotanticipateeverypossiblecircumstancethatmightinvolveapotentialhazard.
● Thisheatpumpairconditionerisdesignedforstandardairconditioningapplicationsonly.Donotusethis
heatpumpairconditionerforotherpurposes,suchasdryingclothes,refrigeratingfoods,orforanyother
coolingorheatingprocess.
● Donotinstalltheunitoutdoors.Donotinstalltheunitinthefollowingplaces.Itmaycauseare,
deformation,corrosionorfailure.
*Placeswheretherearehighlevelsofoilmist(includingmachineryoil).
*Placeswheretherearehighalkalinitylevels(i.e.,chlorineorbrominesuchasoverhottubs,etc.).
*Placeswhereammablegasesorliquidsmaybeusedorgenerated.
*Placeswithahighconcentrationofsalts,saltymistsorsprays(suchasoversalt-wateraquariums).
*Placeswithanatmosphereofhighnuisancedust.Placeswithorganicsolventatmospheres,suchas
paintingandcleaninglocations.
● Donotinstalltheunitintheplacewherecondensatewatercanleakontotheunitordamagemayoccur.
● Payattentiontothefollowingpointswhentheunitisinstalledinahospitalorotherfacilitywhere
electromagneticwavesgeneratefrommedicalequipment.
*Donotinstalltheunitinplaceswhereelectromagneticwavesradiatetotheelectricalbox,wiredcontroller
cableorwiredcontroller.
*Installtheunitatleast10ft(3m)awayfromelectromagneticwavesorinterferencessuchasaradio.
● Theinstallerandsystemspecialistshallsecureagainstleakageaccordingtolocalregulationsor
standards.Thissystemhasbothhighandlowpressurerefrigerantand,assuch,comprisesapressurized
system.Neverloosenthreadedjointswhilethesystemisunderpressureandneveropenpressurized
systemparts.
● NopartofthismanualmaybereproducedwithoutwrittenpermissionfromJohnsonControls.
● ItisassumedthatthisunitwillbeoperatedandservicedbyEnglishspeakingpeople.
Ifthisisnotthecase,thedistributorordealercanprovideoraddsafety,cautionandoperatingsignsinthe
nativelanguage.
● Ifyouhaveanyquestions,contactyourdistributor.
Thismanualshouldbeconsideredasapermanentpartoftheairconditioningequipmentandshouldremain
withtheairconditioningequipment.
P5417011-rev.2
iii
SAFETY SUMMARY
SignalWords
● Signalwordsareusedtoidentifylevelsofhazardseriousness.
Denitionsforidentifyinghazardlevelsareprovidedbelowwiththeirrespectivesignalwords.
: DANGERindicatesahazardoussituationwhich,ifnotavoided,
willresultindeathorseriousinjury.
: WARNINGindicatesahazardoussituationwhich,ifnotavoided,
couldresultindeathorseriousinjury.
: CAUTIONusedwiththesafetyalertsymbol,indicatesahazardoussituationwhich,
ifnotavoided,couldresultinminorormoderateinjury.
: NOTICEisusedtoaddresspracticesnotrelatedtopersonalinjury.
: NOTEisusefulinformationforoperationormaintenance.
DANGER
WARNING
CAUTION
NOTICE
NOTE
CHECKING PRODUCT RECEIVED
● Uponreceivingthisproduct,inspectitforanyshippingdamage.
Inspectallelectricalconnections.Connectionsmustbecleanandtightattheterminals.
Claimsfordamageeitherapparentorconcealed,shouldbeledimmediatelywiththeshippingcompany.
NOTE:Roughhandlingmaydislocateinternalcomponents.
● Checkthemodelnumber,electricalcharacteristics(powersupply,voltageandfrequency)andaccessories
todetermineiftheyarecorrectwiththeorderingandshippinginformation,toensurethecorrectunithas
beenshipped.
Tominimizethepossibilityofdamageafterinspection,theunitsshouldbeinstalledassoonaspossible.
Thestandardinstallationandgeneraluseofthisunitisexplainedinthismanual.
Althoughcommonprocessesandproceduresforinstallingunitsarepresentedinthismanual,itsusefor
installationofunitsotherwiseindicatedinthismanualisnotrecommended.Pleasecontactyourlocalagent,
astheoccasionarises.
Ourliabilityshallnotcoverdefectsarisingfromthealterationperformedbyacustomerwithoutourconsentin
awrittenform.
iv
P5417011-rev.2
● Donotperforminstallationwork,refrigerantpipingwork,condensatepump,orcondensatepipingand
electricalwiringconnectionwithoutreferringtotheInstallationManual.Iftheinstructionsarenotfollowed,
itmayresultinawaterleakage,electricshockorare.
● Usethespeciednon-ammablerefrigerant(R410A)fortheoutdoorunitintherefrigerantcycle.
ChargeonlyR410Aintotheunit.Donotchargeothermaterialsintotheunitsuchashydrocarbon
refrigerants(propane),oxygen,ammablegases(acetylene)orpoisonousgaseswheninstalling,
maintainingandmovingtheunit.Theseammablesareextremelydangerousandmaycausean
explosion,are,orinjury.Asoriginallymanufactured,thisunitcontainsrefrigerantinstalledbyJohnson
Controls.JohnsonControlsusesonlyrefrigerantsthathavebeenapprovedforuseintheunit’sintended
countryormarket.JohnsonControls’distributorssimilarlyareonlyauthorizedtoproviderefrigerantsthat
havebeenapprovedforuseinthecountriesormarketstheyserve.Therefrigerantusedinthisunitis
identiedontheunit’sfaceplateand/orintheassociatedmanuals.Anyadditionsofrefrigerantintothis
unitmustcomplywiththecountry’srequirementswithregardtorefrigerantuseandshouldbeobtained
fromJCIdistributors.Useofunapprovedrefrigerantsubstituteswillvoidthewarrantiesandcancause
injuryordeath.
● Donotpourwaterintotheindoororoutdoorunit.Theseunitsareequippedwithelectricalparts.
Exposuretowatermaycauseseriousinjury.
● DonotopentheservicecoveroraccesspanelfortheindoororoutdoorunitswithoutturningOFFthemain
powersupply.
● Donottouchoradjustsafetydevicesinsidetheindoorunitoroutdoorunits.Ifthesedevicesaretouched
orreadjusted,itmaycauseaseriousinjury.
● Carefullycheckforleakingrefrigerantgas.Ifthereissignicantleakage,itcancausedicultyin
breathing.TurnOFFthemainswitch,andcontactyourservicecontractorifrefrigerantleakageoccurs.
● Makesurethattherefrigerantleakagetestisperformed.
Refrigerant(uorocarbon)forthisunitisnon-ammableandodorless.
Howeverrefrigerantthatcomesincontactwithameswillcreatetoxicgas.
Becausetherefrigerantisheavierthanair,theoorsurfacewillbelledwithit,whichcouldcause
suocation.
● Theinstallerandsystemspecialistshallsecureagainstrefrigerantleakageaccordingtolocalregulations
orstandards.
● RecommendedtouseaGroundFaultCircuitInterrupter(GFCI).
Intheeventoffault,thereisdangerofanelectricshockorareifitisnotused.
DANGER
SAFETY SUMMARY
P5417011-rev.2
v
SAFETY SUMMARY
WARNING
● Donotuseanysprayssuchasinsecticide,lacquer,hairsprayorotherammablegaseswithin
approximately4ft(1.3m)ofthesystem.
● Ifthecircuitbreakerorfuseisblown,stopthesystemandcontactyourservicecontractor.
● Electricalshockmayoccurifunitisnotgroundedcorrectly.Ensureasecuregroundconnection.
Donotconnectthegroundwiringtogaspiping,condensatepiping,lightningconductororgroundwiring
fortelephones.
● Beforeperforminganybrazingwork,ensurethereisnoammablematerialaround.
Whenusingrefrigerant,besuretowearproperglovestopreventfrostbite.
● Insulatewiring,condensatepipingandelectricalcomponentsfromextremetemperaturesandburring
animals.Failuretodosocan,overtime,deterioratesystemperformance.
● Formoredetailsoftherefrigerantpipingandheightlimitations,refertotheInstallationandMaintenance
ManualfortheOutdoorUnit.
● Secureallwireconnectionsoutsideforcesontheterminalsmaycausere.Unauthorizedmodicationsto
thisunitareprohibitedforthefollowingreasons:
1. Modicationsmaycreatehazardswhichcouldresultindeath,seriousinjuryorequipmentdamage.
2. Modicationswillvoidproductwarranties.
 3.Modicationsmayinvalidateproductregulatorycertications.JohnsonControlsInc.hasconducted
bothinternalandcoordinatedAgencytestingtoensureproductcompliancewithapplicableProductSafety
andRegulatorystandards.Productcerticationisdesignatedeitherontheproductitselforintheproduct
literature.ThecerticationmarkidentiestheapplicablestandardsaswellastheAgencyorNationally
RecognizedTestLab(NRTL)involved.Ifchangesaremadetotheproduct,anengineeringreviewwill
beneededtoassesstheimpacttotheproductcertication.Insomeinstances,thechangesmaybe
suchthattheAgencyorNRTLwillrequirereapprovaloftheproductbymeansofaeldorsiteinspection
andcertication.Anypersonorentitymakingchangestotheproductisresponsibleforobtainingany
necessaryengineeringreviewandreapproval.
4. ModicationsmayviolateOSHAstandards.OSHAstandardsmayrequirethatonlycertiedproducts
beusedincertainapplicationsandmodicationsthatresultinthelossofproductcerticationmayviolate
thoseOSHAstandards:
“IfaproductdoesnothaveNRTLapprovalasrequiredbyanOSHAstandard,oriftheproductnolonger
meetsNRTLapprovalrequirementsbecauseofchangesmadetoit,theproductmustbe
 (1)replacedwithaproperlyapprovedproduct,
(2)approvedbyanNRTLthatisrecognizedfortestingthistypeofproduct,or
(3)reinspectedandreapprovedbyanNRTL,ifitwasproperlyapprovedbuttheuserhaschangedit.”
● Ifinstalledinasmallroom,takemeasurestopreventtherefrigerantfromexceedingthemaximum
allowableconcentrationintheeventthatrefrigerantgasesshouldescape.Theinstallationshouldmeet
requirementsinASHRAEStandards15and34.Ifrefrigerantgashasleakedduringtheinstallationwork,
ventilatetheroomimmediately.
● Tightenthearenutwithatorquewrenchinthespeciedmanner.Donotapplyexcessiveforcetothe
arenutwhentightening.Ifyoudo,thearenutcancrackandrefrigerantleakagemayoccur.
● Whenmaintaining,relocatingordisposingoftheunit,dismantletherefrigerantpipingafterthecompressor
stops.
● Highlydangerouselectricalvoltagesareusedinthissystem.Carefullyrefertothewiringdiagramand
theseinstructionswhenwiring.Improperconnectionsandinadequategroundingcancauseseriousinjury
ordeath.
● PerformallelectricalworkinstrictaccordancewiththisInstallationandMaintenanceManualandall
relevantregulatorystandards.
● Usespeciedcablesbetweenunits.
vi
P5417011-rev.2
NOTICE
● Becarefulthatmoisture,dust,orvariantrefrigerantcompoundsnotentertherefrigerantsystemduring
installationwork.Foreignmattercoulddamageinternalcomponentsorcauseblockages.
● Donotinstalltheindoorunit,outdoorunit,wiredcontrollerandcablewithinapproximately10ft(3m)of
strongelectromagneticwaveradiatorssuchasmedicalequipment.
● Afteralongshutdown,applypowertotheoutdoorunit(s)atleast12hourspriortooperationofthesystem
forpreheatingofthecompressoroil.
NOTE
● Theheatingcapacityoftheheatpumpunitisdecreasedaccordingtotheoutdoorairtemperature.
Therefore,itisrecommendedthatauxiliaryheatingequipmentbeusedintheeldwhentheunitis
installedinalowtemperatureregion.
● Donotstepontheunit.
● Donotputanyforeignmaterialontheunitorinsidetheunit.
● Provideastrongandcorrectfoundationsothat:
●Theoutdoorunitisnotonanincline.
●Abnormalsounddoesnotoccur.
●Theoutdoorunitwillnotfalldownduetoastrongwindorearthquake.
CAUTION
WARNING
● Besuretoinstallcircuitbreakers(groundfaultinterrupter,isolatingswitch,moldedcasecircuitbreaker
andsoon),withthespeciedcapacity.Ensurethatthewiringterminalsaretightenedsecurelyto
recommendedtorquespecications.Ifacircuitbreakerorfuseisfrequentlyblown,shutdownthesystem
andcontactyourservicecontractor.
● Clampelectricalwiressecurelywithacableclampafterallwiringisconnectedtotheterminalblock.
Inaddition,runwiressecurelythroughthewiringaccesschannel.
● Wheninstallingthemainpowerlines,donotapplytensiontothecables.Securethesuspendedcablesat
regularintervalsaccordingtolocalcodes,butnottootightly.
● Afterstoppingoperation,besuretowaitatleastveminutesbeforeturningothemainpowerswitch.
Otherwise,waterleakageorelectricalbreakdownmayresult.Disconnectthepowersupplycompletely
beforeattemptinganymaintenanceforelectricalparts.Checkwithavoltagemetertoensurethatno
residualvoltageispresentafterdisconnectingthepowersupply.
● Insulatetherefrigerantpipeconnectiontopreventcondensation.
● Besuretoattachthecoversothatittssecurelyontheelectricalboxwithoutanygaps.
Securethecoverwithscrews.
P5417011-rev.2
vii
TABLE OF CONTENTS
1. SafetySummary .............................................................................................................................................1
2. Structure .........................................................................................................................................................1
2.1 Dimensions .............................................................................................................................................1
2.2 RefrigerationCycle ................................................................................................................................. 2
2.3 NecessaryToolsandInstrumentListforInstallation ..............................................................................3
3. TransportationandHandling ........................................................................................................................... 3
3.1 Transportation ........................................................................................................................................3
3.2 HandlingofChange-OverBox ...............................................................................................................3
3.3 CombinationofChange-OverBoxandIndoorUnit ................................................................................ 3
4. Change-OverBoxInstallation .........................................................................................................................4
4.1 Factory-SuppliedAccessories ................................................................................................................4
4.2 InitialCheck ............................................................................................................................................5
4.3 SuspensionBolts ....................................................................................................................................6
4.3.1 LocationofSuspensionBolts .......................................................................................................6
4.3.2 InstallingSuspensionBolts ........................................................................................................... 6
4.4 Installation ..............................................................................................................................................7
4.4.1 ChangingtheLocationoftheElectricalBox .................................................................................7
4.4.2 MarkingofthePositionsoftheSuspensionBoltsandWiringConnections .................................8
4.4.3 MountingandHangingtheChange-OverBox .............................................................................. 8
5. RefrigerantPipingWork .................................................................................................................................. 9
5.1 RefrigerantPiping ...................................................................................................................................9
5.2 RefrigerantPipingWork ....................................................................................................................... 11
6. ElectricalWiring ............................................................................................................................................14
6.1 GeneralCheck .....................................................................................................................................15
6.2 ElectricalWiring ....................................................................................................................................15
6.3 ElectricalWiringConnection ................................................................................................................16
6.4 DIPSwitchSetting ................................................................................................................................ 17
7. TestRun ........................................................................................................................................................ 18
8. SafetyandControlDeviceSetting ................................................................................................................18
viii
P5417011-rev.2
5-1/2
(139)
5-3/16
(132)
5-1/2
(139)
1-9/16
(40)
7/8
(23)
13 (330)
(For Suspension Bolt)
Suspension Bracket
2×(7/16 (11)×1-5/16 (34))
Slotted Hole
Electrical Box
(Available for
both sides)
Ground Terminal (M5)
(in Electrical Box)
1-1/2
(38)
11-7/8 (301)
1-1/2
(38)
14-13/16 (376)
11-7/8 (301)
7-1/16
(180)
1-1/2 (38)
1-9/16 (40)
Control Wiring
Connection
(ϕ13/16 (20))
Power Supply
Wiring Connection
for Conduit Tube (ϕ7/8 (22.2))
Not Used
5-1/2
(140)
13/16 (20)
1-9/16
(40)
2-1/8
(54)
5-15/16
(151)
2-1/2
(63)
(ϕ5/8 (15.88) Flare Nut)
Outdoor Unit Connecting Side
8-7/16
(214)
1-9/16
(39)
Refrigerant Gas
(Low Pressure)
Pipe Connection
(ϕ3/4 (19.05) Flare Nut)
Refrigerant Gas
(High/Low Pressure)
Pipe Connection
Indoor Unit Connecting Side
7-1/2 (191)
4-3/8 (111)
1 (25)
Refrigerant Gas
Pipe Connection
(ϕ5/8 (15.88)
Flare Nut)
P5417011-rev.2
1
1. Safety Summary
● Do not perform installation work, refrigerant
piping work or electrical wiring connection
without referring to our Installation Manual.
● Check that the ground wire is securely
connected.
● Connect a fuse of specied capacity.
● Do not install the Change-Over Box and cable
within approximately 10 ft (3m) from strong
electromagnetic wave radiators such as
medical equipment.
● For more details of the refrigerant piping and
height limitations, refer to the Installation and
Maintenance Manual for the Outdoor Unit.
Figure2.1DimensionsofChange-OverBox(1)
2. Structure
2.1 Dimensions
COBS048B22C
Unit:inch(mm)
Specications
Model
COBS048B22C
PowerSupply
AC1Phase
208/230V,60Hz
Power
Consumption
5W
Refrigerant R410A
NetWeight 13lbs.(6kg)
NumberofBranch
(forIndoorUnit)
1
S
S S
Indoor Unit Side Outdoor Unit Side
High/Low Pressure
Gas Pipe Connection
Strainer
Strainer
Strainer
:
Brazing Connection
:
Flare Nut Connection
:
Change-Over Box
:
Refrigerant Pipe [Field Installation]
Electronic Expansion
Valve [MVD
1
]
Electronic Expansion
Valve [MVS
1
]
Low Pressure
Gas Pipe Connection
Gas Pipe Connectio
n
5-3/4
(146)
5-3/16
(132)
5-1/2
(139)
1-9/16
(40)
7/8
(23)
13 (330)
(For Suspension Bolt)
Suspension Bracket
2×(7/16 (11)×1-5/16 (34))
Slotted Hole
Ground Terminal (M5)
(in Electrical Box)
1-1/2
(38)
11-7/8 (301)
1-1/2
(38)
14-13/16 (376)
11-7/8 (301)
7-1/16
(180)
1-1/2 (38)
1-9/16 (40)
Control Wiring
Connection
(ϕ13/16 (20))
Power Supply
Wiring Connection
for Conduit Tube (ϕ7/8 (22.2))
5-1/2
(140)
Electrical Box
(Available
for both sides)
13/16 (20)
1-9/16
(40)
2-1/8
(54)
5-15/16
(151)
2-1/2
(63)
(ϕ5/8 (15.88) Flare Nut)
Outdoor Unit Connecting Side
8-7/16
(214)
1-9/16
(39)
Refrigerant Gas
(Low Pressure)
Pipe Connection
(ϕ3/4 (19.05) Flare Nut)
Refrigerant Gas
(High/Low Pressure)
Pipe Connection
Indoor Unit Connecting Side
7-1/2 (191)
4-3/8 (111)
1 (25)
Refrigerant Gas
Pipe Connection
(ϕ3/4 (19.05)
Flare Nut)
Not Used
2
P5417011-rev.2
2.2 RefrigerationCycle
Figure2.3RefrigerationCycleDiagram
COBS096B22C
Figure2.2DimensionsofChange-OverBox(2)
Specications
Model
COBS096B22C
PowerSupply
AC1Phase
208/230V,60Hz
Power
Consumption
5W
Refrigerant R410A
NetWeight 13lbs.(6kg)
NumberofBranch
(forIndoorUnit)
1
Unit:inch(mm)
P5417011-rev.2
3
2.3 NecessaryToolsandInstrumentListforInstallation
3. Transportation and Handling
3.1 Transportation
Transporttheproductasclosetotheinstallation
locationaspracticablebeforeunpacking.
3.3 CombinationofChange-OverBoxandIndoorUnit
Combinationsareasfollows.
Table3.1CombinationsofIndoorUnits
3.2 HandlingofChange-OverBox
Do not put any foreign material into the indoor
unit and check to ensure that none exists in
the Change-Over Box before the installation
and test run. Otherwise, a re or failure, or
something similar may occur.
Do not put any material on the product.
No. Tool No. Tool
1 Handsaw 11 Wrench
2 PhillipsScrewdriver 12 ChargingCylinder
3 VacuumPump 13 ManifoldGauge
4 RefrigerantGasHose 14 WireCutter
5 Megohmmeter 15 GasLeakDetector
6 CopperPipeBender 16 Level
7 ManualWaterPump 17 CrimperforSolderlessTerminals
8 PipeCutter 18 Hoist(forIndoorUnit)
9 BrazingKit 19 Ammeter
10 HexWrench 20 VoltageMeter
Be careful not to damage insulation materials
of unit’s surface when lifting.
NOTE:
Exceedingthetotalcapacitymaycauseinsucientperformanceandabnormalsound.Besuretoconnect
theChange-OverBoxwithintheallowabletotalcapacity.
NOTE:
Usetoolsandmeasuringinstruments(vacuumpump,refrigeranthose,chargingcylinder,andmanifold
gauge)exclusivelyfortherefrigerantR410A.
Model COBS048B22C COBS096B22C
NumberofBranch(forIndoorUnit) 1 1
SingleUnitperBranch
MaximumTotalCapacityof
AllConnectedIndoorUnits
54MBHorless 96MBHorless
MultipleUnitsperBranch
MaximumNumberof
ConnectedIndoorUnitsperBranch
7 8
MaximumTotalCapacityof
AllConnectedIndoorUnits
41MBHorless 71MBHorless
4
P5417011-rev.2
4. Change-Over Box Installation
● Do not install the Change-Over Box in a
ammable environment to avoid re or an
explosion.
4.1 Factory-SuppliedAccessories
Checktoensurethatthefollowingaccessoriesare
packedwiththeChange-OverBox.
NOTE
● Check to ensure that the ceiling slab is strong
enough.
● Do not install the Change-Over Box outdoors.
If installed outdoors, an electric hazard or
electric leakage may occur.
● Installation WARNING: Ensure that all safety
features, disconnects and interlocks are
in place and functioning properly prior to
putting the equipment into operation. Never
by-pass or jump-out any safety device or
switch.
Ifanyoftheseaccessoriesarenotpackedwiththe
unit,pleasecontactyourdistributor.
Table4.1Factory-SuppliedAccessories
inch(mm)
No. Accessory COBS048B22C Qty. COBS096B22C Qty.
(1) Reducer
ID
f
5/8
(
f
15.88)
ID
f
3/4
(
f
19.05)
1
-
-
(2)
AccessoryPipe
(forFlareNut)
ID
f
1/2
(
f
12.7)
Flaring
f
5/8
(
f
15.88)
2
ID
f
7/8
(
f
22.2)
Flaring
f
3/4
(
f
19.05)
2
(3)
ID
f
3/4
(
f
19.05)
Flaring
f
3/4
(
f
19.05
)
1
ID
f
3/4
(
f
19.05)
Flaring
f
3/4
(
f
19.05)
2
(4)
-
-
ID
f
3/4
(
f
19.05)
Flaring
f
5/8
(
f
15.88)
1
(5)
Insulation
Material
ID
f
5/8
(ID
f
16)
2 1
(6)
ID
f
13/16
(ID
f
20)
1
-
-
(7)
ID
f
7/8
(ID
f
22)
-
- 2
(8)
ID
f
1-1/2
(ID
f
38)
2 1
(9)
ID
f
1-11/16
(ID
f
43)
1 2
(10) Clamp
6 6
( 17-11/16 (450))
Min.
AM
in. A
Min. 2-3/4 (70)
Min. 2-3/4 (70)
Electrical Box
Service Access Door
2-Suspension Bolt
(Field-Supplied)
Upper Side
Bottom Side
W3/8 or M10
Unit: inch (mm)
3-15/16
(100)
P5417011-rev.2
5
4.2 InitialCheck
● InstalltheChange-OverBoxwithproper
clearancearounditformaintenanceworking
space,asshowninFigure4.1below.
Size
Model
A
COBS048B22C 11-13/16(300)
COBS096B22C 15-3/4(400)
Figure4.1ServiceSpace
● Checktoensurethattheceilingissuciently
strongtosustaintheChange-OverBox.Ifthe
ceilingisweak,abnormalsoundandvibration
mayoccur.
● Whentheelectronicexpansionvalveinthe
Change-OverBoxisactivated,soundsmaybe
producedfromtheChange-OverBox.Takethe
followingactiontominimizethesound.
(A) InstalltheChange-OverBoxinsidethe
ceiling.Asfortheceilingmaterial,select
amateriallikeplasterboardatleast1inch
(9mm),whichminimizesoperationsound.
(B) DonotinstalltheChange-OverBoxina
placenearbedroomsorhospitalrooms.
● Whentheoperationischangedtocooling/
heatingmode,achangeinthetypicalrefrigerant
owsoundsmaybeheardorperceivedfromthe
Change-OverBox.
Therefore,installtheChange-OverBoxinthe
ceilingofthecorridorsothattherefrigerant
owingsoundmaynotbeheardintheroom.
● DonotinstalltheChange-OverBoxinahot
orhumidplace,suchasakitchen,toprevent
condensationontheoutersurfaceofthe
Change-OverBox.
WheninstallingtheChange-OverBoxinsuch
places,applyadditionalinsulation.
● Payattentiontothefollowingpointswhenthe
Change-OverBoxisinstalledinahospitalor
otherfacilitywherethereareelectronicwaves
frommedicalequipment.
(A) DonotinstalltheChange-OverBoxwhere
theelectromagneticwaveisdirectlyradiated
totheelectricalboxorcommunicationcable.
(B) InstalltheChange-OverBoxand
componentsasfaraspracticableoratleast
10ft(3m)fromtheelectromagneticwave
radiator.
(C) Installanoiselterwhenthepowersupply
emitsharmfulnoises.
● Formoredetailsoftherefrigerantpipingand
heightlimitations,refertotheInstallationand
MaintenanceManualfortheOutdoorUnit.
● Ensuretheinstallationplaceisconvenient
fortherefrigerantpipingorelectricalwiring
connection.
● Donotdrill,ordrivescrewsintothecabinet.
Useonlymountingpointsprovided.
1-9/16 (40)
7/8 (23)
2-7/16 (11) x 1-5/16 (34)
Slotted Hole
13 (330)
Electrical Box
(For Suspension Bolt)
Suspension Bracket
Unit: inch (mm)
6
P5417011-rev.2
Figure4.2PositionofSuspensionBolts
4.3 SuspensionBolts
4.3.1LocationofSuspensionBolts
(1) Selectanallocationandinstallation
directionoftheChange-OverBox.
Paycarefulattentiontothespaceforthe
piping,wiringandmaintenance.
Formoredetailsoftherefrigerantpipingand
heightlimitations,refertotheInstallationand
MaintenanceManualfortheOutdoorUnit.
(2) Mountsuspensionbolts.
(3) Mountthesuspensionboltsintheslotted
holeontheelectricalboxsideasshownin
Figure4.2.
(4) Contactaqualiedcontractororcarpenter
fortheceilingorstructurework.
1. Reinforcethedesignatedopeninginthefalseceilingarea.Useapprovedmaterialsofsucienttensile
strengthtoallowforqualityinstallation.
2. Strengthensuspensionboltswithsupportplatesasrequiredinpreparationforanearthquake.(Refer
totheSafetySectionformoreinformation.)
Useeld-suppliedM10suspensionboltsandsupportplates.
ForWoodenBeam ForConcreteSlab
Installtheunittothetiebeam(forsingle-storied
building)ortothesecondoorgirder(fortwo-storied
building),andusesucientlystrongsquaredtimber
asshownbelow.
inch(mm)
IntervalbetweenBeams SquaredTimber
<35-7/16(900) 2-3/8(60)square
<70-7/8(1800) 3-9/16(90)square
Installsuspensionboltssothatitcanwithstandthe
unitweightload.
Insert
Concrete
Suspension Bolt
4.3.2InstallingSuspensionBolts
Mountsuspensionbolts,asshowninFigure4.3.
Figure4.3MountingofSuspensionBolts
Service Cover for
Electronic Expansion Valve
Electrical Box
Service Cover for
Electrical Box
(1)
(1)
(2)
(3)
(3)
(4)
(5)
(5)
(6)
A
(2) (6)
(6)
(7)
(7)
Edge Saddle Wire Clip
Edge Saddle
Electrical Box
Edge Saddle Wire Clip *
Edge Saddle
Electrical Box
MVD1
MVS1
MVD1
MVS1
(Before Change)
(After Change)
P5417011-rev.2
7
4.4 Installation
4.4.1 ChangingtheLocationoftheElectricalBox
Dependingontheinstallationspace,changingthelocationoftheelectricalboxisavailable.
Whenchangingthelocationoftheelectricalbox,followtheproceduresbelow:
(1) Removetheservicecoverfortheelectricalbox.
(2) Removetheservicecoverfortheelectronicexpansionvalve.
(3) Removetheelectricalbox.
(4) Removethewiringfromthewireclipandedgesaddle,andmovetheelectricalbox.
Aftermovingtheelectricalbox,putthewiringintotheedgesaddleandbindwiththewireclip.
(Referto“EnlargedViewofA”below.)
(5) Mounttheelectricalbox.
(6) Rotatetheservicecoverfortheelectronicexpansionvalve180degreesandmountit.
(7) Mounttheservicecoverfortheelectricalbox.
* Bindwiringwithwireclipstopreventcondensation
fromenteringtheelectricalbox.
EnlargedViewofA
1-3/16 to
1-15/16 inch
(30 to 50mm)
Suspension Bolt (M10 or W3/8)
(Field-Supplied)
Nut (Field-Supplied)
Double-Nut (Field-Supplied)
Washer (Field-Supplied)
Washer (Field-Supplied)
Suspension Bracket
(Equipped with Change-Over Box)
Change-Over
Box
Suspension Bolt
Suspension Bracket
Bottom Side
Upper Side
8
P5417011-rev.2
Figure4.4Suspension
Figure4.5HangingMethod
4.4.3 MountingandHangingtheChange-Over
Box
(1) Putnutsoneachofthetwosuspensionbolts
beforehangingtheChange-OverBox,as
showninFigure4.4.
T
Mountingwashersarerequiredinorder
toaxthesuspensionbrackettothe
suspensionbolt.
Field-SuppliedParts
*SuspensionBolt: 2-W3/8orM10
*Nut: 6-W3/8orM10
*Washer: 4-W3/8orM10
(2) HangingtheChange-OverBox
(a)HangtheChange-OverBoxbyputting
handsonthebottomofthecabinet.
(b) Insertthesuspensionboltintothegroove
partofthesuspensionbracketasshown
inFigure4.5.Ensurethatthewashers
arecorrectlyaxedtothesuspension
bracket.
(c) AfterproperlyinstallingtheChange-
OverBox,ensurethatallpipingand
wiringconnectionsarecorrectbefore
proceeding.
Formoredetailsoftherefrigerant
pipingandheightlimitations,refertothe
InstallationandMaintenanceManualfor
theOutdoorUnit.
(d) KeeptheChange-OverBoxleveltothe
ceilingsurface.IftheChange-OverBoxis
notlevel,amalfunctionmayoccur.
(e) Tightenthenutsofthesuspension
boltwiththesuspensionbracketafter
adjustmentiscompleted.
Adhesivemustbeappliedtothenutsin
ordertopreventthemfromloosening.
4.4.2 MarkingofthePositionsoftheSuspension
BoltsandWiringConnections
(1) Markthepositionsofthesuspensionbolts,
refrigerantpipingconnectionsandwiring
connection.
(2) Installationdimensionsareshownin
Figure2.1.
When installing pipe through
the wall, secure a cap at the
end of the pipe.
Correct
CorrectIncorrect Incorrect
Correct Incorrect
HoleHole
Attach a cap
or vinyl tape.
Attach a cap
or vinyl tape.
Attach a cap
or vinyl bag with
rubber band.
Do not place the pipe
directly on the ground.
Rain water can
enter.
1/64 ~ 1/32R
A
d
90
o
+
2
o
45
o
+
2
o
P5417011-rev.2
9
Use the specied non-ammable refrigerant
(R410A) for the outdoor unit in the refrigerant
cycle. Do not charge material other than
R410A into the unit such as hydrocarbon
refrigerants (propane or something similar),
oxygen, ammable gases (acetylene or etc.) or
poisonous gases when installing, maintaining
and moving. These ammables are extremely
dangerous and may cause an explosion, a re,
and injury.
For more details of the refrigerant piping and
height limitations, refer to the Installation and
Maintenance Manual for the Outdoor Unit.
● FlaringDimension
Performthearingworkasshownbelow.
● CopperCouplingSelection
Ifhardtemperpipeisused,thearingwork
cannotbeperformed.Inthiscase,useacopper
couplingselectedfromthetablebelow.
(
T
)Ifitisnotpossibletoformthecorrect
arewith3/4inchmaterialthenuse
anaccessorypipe(withaare).
5.1 RefrigerantPiping
● Cautions for Refrigerant Pipe Work (Example)
(1) Preparelocally-suppliedcopperpipes.
(2) Selectcleancoppertubesmakingsurethere
isnodustormoistureinsidethetubes.
Beforeconnectingpipes,blowtheinsideof
thetubeswithnitrogenordryair,toremove
anydustorforeignmaterials.
(3) Selectthepipingsizeasshowninthetables
below.Furthermore,checkfortheare
nutandaringdimensionaccordingtothe
followinggureandtable.
5. Refrigerant Piping Work
NOTE:
Donotuseacoppercouplingotherthanthose
speciedinthetableabove.
B
Flare Nut
inch(mm)
Diameter
(ɸd)
A
+0
-0.02(-0.4)
R410A
1/4 (6.35) 0.36 (9.1)
3/8 (9.52) 0.52 (13.2)
1/2 (12.7) 0.65 (16.6)
5/8 (15.88) 0.78 (19.7)
3/4 (19.05) (
T
)
MinimumThickness
inch(mm)
Diameter R410A
1/4 (6.35) 0.020 (0.5)
3/8 (9.52) 0.024 (0.6)
1/2 (12.7) 0.028 (0.7)
5/8 (15.88) 0.031 (0.8)
3/4 (19.05) 0.031 (0.8)
7/8 (22.2) 0.035 (0.9)
1-1/8 (28.58) 0.039 (1.0)
1-5/8 (41.28) 0.057 (1.45)
FlareNutDimensionB
inch(mm)
Diameter R410A
1/4 (6.35) 11/16 (17)
3/8 (9.52) 7/8 (22)
1/2 (12.7) 1 (26)
5/8 (15.88) 1-1/8 (29)
3/4 (19.05) 1-7/16 (36)
T
wo wrenches required to prevent
damaging the copper piping.
Apply Refrigerant Oil.
10
P5417011-rev.2
● CautionsforPipingConnectionWork
(a) Installtherefrigerantpipingbetweenthe
indoorandoutdoorunits.Ensurepiping
doesnottouchceilingandwalls.Otherwise,
anabnormalsoundmaybeheardfromthe
vibrationofthepiping.
(b) Applyrefrigerantoilinathinlayeroverthe
aredpartbeforethearingwork.Then
tightenthearenutwiththespecied
tighteningtorqueusingtwowrenches.
Alwaysuseaback-upwrenchtoprevent
twistingofthecopperpipingwithintheunit
assembly.Performthearingworkonthe
liquidpipingsidebeforethegaspipingside.
Checkforgasleakageafteraringwork.
NOTE:
Refrigerantoiliseld-supplied.
[EtherealOilFVC50K,FVC68D(Idemitsu
KousanCo.Ltd.)]
(c) Whentemperatureandhumidityinsidethe
ceilingexceed80
o
F(27
o
C)/RH,relative
humidity,80%,applyadditionalinsulation
approximately13/16inch(20mm)thickness
totheaccessoryinsulation.Itprevents
condensationonthesurfaceoftheinsulation
(refrigerantpipeonly)andpossibledamage
toelectroniccomponents.
(d) Performtheleakagetest601psi(4.15MPa)
forthetestpressure.RefertotheInstallation
andMaintenanceManualfortheOutdoor
Unitformoredetails.
(e) Performthermalinsulationworkbyinsulating
andtapingtheareconnectionandreducer
connection.Alsoinsulatealltherefrigerant
pipes.
● Do not apply excessive force to the are
nut when tightening. Excessive force can
result in the are nut cracking and refrigerant
leakage may occur. Use the specied
tightening torque.
● For more details of the refrigerant piping
work, vacuum pumping and refrigerant
charge, refer to the Installation and
Maintenance Manual for the Outdoor Unit.
RequiredTighteningTorque
PipeSize TighteningTorque
ɸ1/4inch (6.35mm) 10.3to13.3 ft
.
lbs (14to18 N
●
m)
ɸ3/8inch (9.52mm) 25.1to31.0 ft
.
lbs (34to42 N
●
m)
ɸ1/2inch (12.7mm) 36.1to45.0 ft
.
lbs (49to61 N
●
m)
ɸ5/8inch (15.88mm) 50.2 to 60.5 ft
.
lbs (68to82 N
●
m)
ɸ3/4inch (19.05mm) 73.8to88.5 ft
.
lbs (100to120 N
●
m)
Wet Cloth for Cooling
Torch
Brazing
When the connections must be cut to prepare
for brazing, use only a copper pipe cutter,
which reduces burrs and copper shavings.
Remove just enough pipe to facilitate the
connection and brazing. Blow nitrogen through
the pipes to clear any remaining foreign
material before the nal tting and brazing.
Prior to brazing, temporarily remove or protect
the piping insulation to prevent it from burning.
Wrap a wet cloth or use a liberal amount of
heat-absorbing compound upstream of the
brazing point to protect the components inside
the Change-Over Box from heat damage.
Ensure the integrity of the brazed joint.
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York VRF Single Change-Over Box Installation guide

York
Brand
York
Model
VRF Single Change-Over Box
Category
Split-system air conditioners
Type
Installation guide
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