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Warning:
• The unit must not be installed by the user. Ask a dealer or an authorized
techniciantoinstalltheunit.Iftheunitisinstalledincorrectly,waterleakage,
electricshock,orremayresult.
• Thisapplianceisintendedtobeusedbyexpertortrainedusersinshops,in
lightindustryandonfarms,orforcommercialusebylaypersons.
• Forinstallationwork,followtheinstructionsintheInstallationManualand
usetoolsandpipecomponentsspecicallymadeforusewithR410Arefrig-
erant.TheR410ArefrigerantintheHFCsystemispressurized1.6timesthe
pressureofusualrefrigerants.IfpipecomponentsnotdesignedforR410A
refrigerantareusedandtheunitisnotinstalledcorrectly,thepipesmayburst
andcausedamageorinjuries.Inaddition,waterleakage,electricshock,or
remayresult.
• Theunitmustbeinstalledaccordingtotheinstructionsinordertominimize
theriskofdamagefromearthquakes,typhoons,orstrongwinds.Anincor-
rectlyinstalledunitmayfalldownandcausedamageorinjuries.
• Theunitmustbesecurelyinstalledonastructurethatcansustainitsweight.
Iftheunitismountedonanunstablestructure,itmayfalldownandcause
damage
orinjuries.
• Iftheairconditionerisinstalledinasmallroom,measuresmustbetakento
preventtherefrigerantconcentrationintheroomfromexceedingthesafety
limitintheeventofrefrigerantleakage.Consultadealerregardingtheappro-
priatemeasurestopreventtheallowableconcentrationfrombeingexceeded.
Shouldtherefrigerantleakandcausetheconcentrationlimittobeexceeded,
hazardsduetolackofoxygenintheroommayresult.
• Ventilatetheroomifrefrigerantleaksduringoperation.Ifrefrigerantcomes
intocontactwithaame,poisonousgaseswillbereleased.
• Allelectricworkmustbeperformedbyaqualiedtechnicianaccordingto
localregulationsandtheinstructionsgiveninthismanual.Theunitsmustbe
poweredbydedicatedpowerlinesandthecorrectvoltageandcircuitbreakers
mustbeused.Powerlineswithinsufcientcapacityorincorrectelectrical
workmayresultinelectricshockorre.
• UseC1220copperphosphorus,forcopperandcopperalloyseamlesspipes,
toconnecttherefrigerantpipes.Ifthepipesarenotconnectedcorrectly,the
unitwillnotbeproperlygroundedandelectricshockmayresult.
• Useonlyspeciedcablesforwiring.Thewiringconnectionsmustbemade
securelywith notension appliedontheterminalconnections. Also,never
splicethecablesforwiring(unlessotherwiseindicatedinthisdocument).
Failuretoobservetheseinstructionsmayresultinoverheatingorare.
• Theterminalblockcoverpaneloftheoutdoorunitmustbermlyattached.If
thecoverpanelismountedincorrectlyanddustandmoistureentertheunit,
electricshockorremayresult.
• Theapplianceshallbeinstalledinaccordancewithnationalwiringregulations.
• Ifthesupplycordisdamaged,itmustbereplacedbythemanufacturer,its
serviceagentorsimilarlyqualiedpersonsinordertoavoidahazard.
• Wheninstallingorrelocating,orservicingtheairconditioner,useonlythe
speciedrefrigerant(R410A)tochargetherefrigerantlines.Donotmixitwith
anyotherrefrigerantanddonotallowairtoremaininthelines.
Ifairismixedwiththerefrigerant,thenitcanbethecauseofabnormalhigh
pressure in the refrigerant line, and may result in an explosion and other
hazards.
Theuseofanyrefrigerantotherthanthatspeciedforthesystemwillcause
mechanical failure or systemmalfunctionor
unit breakdown.Intheworst
case,thiscouldleadtoaseriousimpedimenttosecuringproductsafety.
• UseonlyaccessoriesauthorizedbyMitsubishiElectricandaskadealeroran
authorizedtechniciantoinstallthem.Ifaccessoriesareincorrectlyinstalled,
waterleakage,electricshock,orremayresult.
• Donotaltertheunit.Consultadealerforrepairs.Ifalterationsorrepairsare
notperformedcorrectly,waterleakage,electricshock,orremayresult.
• Theusershouldneverattempttorepairtheunitortransferittoanotherloca-
tion.Iftheunitisinstalledincorrectly,waterleakage,electricshock,orre
mayresult.Iftheairconditionermustberepairedormoved,askadealeror
anauthorizedtechnician.
• Afterinstallationhasbeencompleted,checkforrefrigerantleaks.Ifrefriger-
antleaksintotheroomandcomesintocontactwiththeameofaheateror
portablecookingrange,poisonousgaseswillbereleased.
1. Safetyprecautions
► Beforeinstallingtheunit,makesureyoureadallthe“Safetyprecau-
tions”.
► Pleasereporttoortakeconsentbythesupplyauthoritybeforeconnec-
tiontothesystem.
Conrmationofpartsattached
In addition to this manual, the following part is supplied with the outdoor unit.
It is used for grounding the S terminal of transmission terminal block TB7. For details
refer to “6. Electrical work”.
Caution:
• DonotventR410Aintotheatmosphere.
1. Safety precautions .....................................................................................2
2. Installation location ....................................................................................4
3. Installing the outdoor unit ..........................................................................7
4. Installing the refrigerant piping ..................................................................7
5. Drainage piping work ...............................................................................15
6. Electrical work .........................................................................................15
7. Test run ....................................................................................................24
8. Special functions .....................................................................................25
9. Installation and operation manual for demand response (DRED) ...........26
Grounding lead wire
After installation work has been completed, explain the “Safety Precautions,” use, and
maintenance of the unit to the customer according to the information in the Operation
Manual and perform the test run to ensure normal operation. Both the Installation
Manual and Operation Manual must be given to the user for keeping. These manuals
must be passed on to subsequent users.
: Indicates a part which must be grounded.
Warning:
Carefullyreadthelabelsafxedtothemainunit.
Contents
Warning:
Describesprecautionsthatmustbeobservedtopreventdangerofinjuryor
deathtotheuser.
Caution:
Describesprecautionsthatmustbeobservedtopreventdamagetotheunit.
RG79Y960H01.indb 2 2018/02/09 14:30:58
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