York TIWM018B21S - Page 6

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TC-17006-rev.1
Refrigerant Precautions
Toreducetheriskofseriousinjuryordeath,thefollowingrefrigerant
precautionsmustbefollowed.
● 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home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JohnsonControlsdistributors.Useofanynon-approvedrefrigerantsubstituteswillvoid
thewarrantyandwillincreasethepotentialriskofinjuryordeath.
● 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therequirementsinASHRAEStandards15and34.Ifrefrigerantgashasleakedduringthe
installationwork,ventilatetheroomimmediately.
● Checkthedesignpressureforthisproductis601psi(4.15MPa).Thepressureoftherefrigerant
R410Ais1.4timeshigherthanthatoftherefrigerantR22.Therefore,therefrigerantpipingfor
R410AshallbethickerthanthatforR22.Makesuretousethespeciedrefrigerantpiping.Ifnot,the
refrigerantpipingmayraptureduetoanexcessiverefrigerantpressure.Besides,payattentionto
thepipingthicknesswhenusingcopperrefrigerantpiping.Thethicknessofcopperrefrigerantpiping
differsdependingonitsmaterial.
● WhenR410Aisused,therefrigerantoiltendstobeaffectedbyforeignmatterssuchasmoisture,
oxidelm,(orfat).Performtheinstallationworkwithcaretopreventmoisture,dust,ordifferent
refrigerantfromenteringtherefrigerantcycle.Foreignmattercanbeintroducedintothecycletosuch
partsastheexpansionvalvecausingoperationalissues.
● Toavoidthepossibilityofdifferentrefrigerantorrefrigerantoilbeingintroducedintothecycle,the
sizesofthechargingconnectionshavebeenchangedfromR407CtypeandR22type.Itisnecessary
toverifytheappropriatetoolsareonhandbeforeperforminginstallationwork.
● UserefrigerantpipesandjointswhichareapprovedforusewithR410A.
● Acompressor/unitcomprisesapressurizedsystem.Neverloosenthreadedjointswhilethesystemis
underpressureandneveropenpressurizedsystemparts.
● Beforeinstallationiscomplete,makesurethattherefrigerantleaktesthasbeenperformed.If
refrigerantgasesescapeintotheair,turnOFFthemainswitch,extinguishanyopenamesand
contactyourservicecontractor.Refrigerant(Fluorocarbon)forthisunitisodorless.Iftherefrigerant
shouldleakandcomeintocontactwithopenames,toxicgascouldbegenerated.Also,becausethe
uorocarbonsareheavierthanair,theysettletotheoor,whichcouldcauseasphyxiation.
● Wheninstallingtheunit,andconnectingrefrigerantpiping,keepallpipingrunsasshortas
possible,andmakesuretosecurelyconnecttherefrigerantpipingbeforethecompressorstarts
operating.Iftherefrigerantpipingisnotconnectedproperlyandthecompressorstartswith
thestopvalveopened,airmaybepulledintothesystemandtherefrigerantcyclewillbecome
subjectedtoextremelyhighpressure,whichcancauseanexplosionorre.
● 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,anddisposingoftheunit,dismantletherefrigerantpipingafterthe
compressorstops.
● Whenpipesareremovedoutfromunderthepipingcover,aftertheinsulationworkiscompleted,
coverthegapbetweenthepipingcoverandpipeswithadditionalinsulatingmaterial(eld-supplied).
Ifthegapisnotcovered,theunitmaybedamagedifsnow,rainwaterorsmallanimalsentertheunit.
● Donotapplyexcessiveforcetothestopvalvewhenopening.Ifdamaged,thestopvalvecouldcome
apartduetorefrigerantpressure.Atthetestrun,fullyopenthegasandliquidvalves,otherwise,
thesedeviceswillbedamaged.(Itisclosedbeforeshipment.)
● Ifthesetupforoutdoorunitsisincorrect,itmaycauseowbackoftherefrigerantandresultinfailure
oftheoutdoorunit.
● Therefrigerantsystemmaybedamagediftheslopeofthepipingconnectionkitexceeds+15
o
.