Midea 16 SEER User manual

INSTALLATION INSTRUCTIONS
SplitSystemHeatPump &AirConditioner
WARNING
Theseinstructionsareintendedasan aidtoqualified
licensed servicepersonnel forproperinstallation,adjust-
mentandoperation ofthisunit.Read theseinstructions
thoroughlybeforeattempting installation oroperation.
Failuretofollowtheseinstructionsmayresultinimproper
installation,adjustment,serviceormaintenancepossibly
resulting in fire,electricalshock,propertydamage,
personalinjury ordeath.
RECOGNIZETHISSYMBOLAS ANINDICATIONOFIMPORTANT SAFETYINFORMATION
DONOTDESTROYTHISMANUAL
Pleaseread carefullyand keep in asafeplaceforfuturereferencebyaserviceman.
NOTE: Appearanceof unitmayvary.
16SEER
Heating& AirConditioning

TABLEOFCONTENTS
1.0SAFETY..................................................................................................................3
1.1INSPECTION....................................................................................................4
1.2LIMITATIONS....................................................................................................4
2.0GENERAL..............................................................................................................4
3.0UNITINSTALLATION............................................................................................6
3.1LOCATION.......................................................................................................6
3.2GROUND INSTALLATION...............................................................................6
3.3ROOFINSTALLATION.....................................................................................6
3.4UNITPLACEMENT..........................................................................................6
3.5PRECAUTIONSDURINGLINEINSTALLATION.............................................7
3.6PRECAUTIONSDURINGBRAZINGOFLINES..............................................8
3.7PRECAUTIONSDURINGBRAZINGSERVICEVALVE..................................9
3.8UNITMOUNTING...........................................................................................10
3.9FACTORY-PREFERREDTIE-DOWNMETHOD............................................11
3.10 REMOVINGTHETOPPANELAND MOTOR..............................................12
4.0ELECTRICAL CONNECTIONS...........................................................................13
4.1GENERALINFORMATION&GROUNDING.................................................13
4.2FIELD CONNECTIONSPOWERWIRING....................................................13
5.0EVACUATION......................................................................................................14
6.0INTERCONNECTINGTUBING............................................................................14
6.1VAPORAND LIQUIDLINES.........................................................................14
6.2MAXIMUMLENGTHOFLINES....................................................................14
6.3VERTICALSEPARATION.............................................................................14
7.0SYSTEM OPERATION........................................................................................14
7.1COMPRESSORCRANKCASEHEATER(CCH)...........................................14
7.2LINESIZING..................................................................................................15
7.3PROTECTIONFUNCTIONINTRODUCTION...............................................16
7.4DEFROSTMODE..........................................................................................16
7.5MANUA
DEFROSTMODE.............................................................................17
8.0CHECKINGREFRIGERANTCHARGE..............................................................17
8.1CHARGINGBY LIQUIDPRESSURE.............................................................17
8.2CHARGINGBYWEIGHT..............................................................................18
8.3FINALLEAK TESTING..................................................................................18
9.0OWNERINSTRUCTIONS......................... ...................................................18
10.0WIRINGDIAGRAM............................................................................................19
2

1.0SAFETY
Thisisasafetyalertsymbol.When youseethissymbolon labelsorin
manuals, be alerttothe potentialforpersonal injury.
Understand and payparticularattentiontothesignal wordsDANGER,WARNING,or
CAUTION.
DANGERindicatesanimminentlyhazardoussituation,which,ifnot avoided,will result
in deathorseriousinjury.
WARNINGindicatesapotentiallyhazardoussituation,which,ifnotavoided,couldresult
in deathorseriousinjury.
CAUTIONindicatesapotentiallyhazardoussituation,which,ifnotavoidedmayresult
in minorormoderateinjury. Itisalsoused toalertagainstunsafepracticesand hazards
involving onlypropertydamage.
WARNING
Improperinstallationmaycreateaconditionwherethe operation ofthe product
couldcausepersonalinjury orpropertydamage.
Improperinstallation, adjustment,alteration, serviceormaintenancecancause
injury orpropertydamage.Refertothismanualforassistanceorforadditional
information,consultaqualifiedcontractor, installerorserviceagency.
Thisisan attention alert symbol.When you seethissymbol onlabelsorin
manuals, be alerttothe potentialforpersonal injury.
CAUTION
Thisproductmustbe installed instrictcompliancewiththe installationinstruc-
tionsand anyapplicable local,state,andnationalcodesincluding,butnot
limited tobuilding,electrical,and mechanicalcodes.
Thisdocumentiscustomerpropertyandistoremainwiththisunit.
These instructionsdonotcover allthedifferentvariationsofsystems nordoes
itprovideforevery possiblecontingencytobemetinconnectionwithinstalla-
tion.
Allphases ofthisinstallationmustcomplywithNATIONALSTATEANDLOCAL
CODES.Ifadditionalinformationisrequiredpleasecontactyourlocaldistribu-
tor.
3
WARNING
FIREORELECTRICALHAZARD
Failuretofollow thesafetywarningsexactlycould resultinseriousinjury, death
orpropertydamage.
Afireorelectrical hazardmayresultcausing propertydamage,personal injury
orloss of life.

Theoutdoorunitsaredesignedtobeconnectedtoamatching indoorcoilwithsweat
connectlines. Sweat connectunitsarefactory chargedwithrefrigerantforamatch-
ingindoorcoil plus25 feetoffield supplied lines.
Matching indoorcoilsareavailable withathermostaticexpansionvalveoran orifice
forthemost common usage.The orificesizeand/orrefrigerantcharge mayneedto
be changedforsomeindoor-outdoorunitcombinations,elevation differencesor
totalline lengths.
2.0GENERAL
1.Limitationsforthe indoor unit,coiland appropriateaccessoriesmustalsobe observed.
2.The outdoor unitmustnotbe installedwithanyductworkinthe airstream.The outdoorfan is
the propeller typeand isnot designedtooperateagainstanyadditionalexternalstatic
pressure.
3.The maximumandminimumconditionsforoperation mustbeobserved toassureasystem
thatwillgivemaximumperformancewithminimumservice.
4.Thisunitisnotdesigned tooperatewithalowambient kit. Donot modifythe controlsystem
tooperatewithanykindof Iowambientkit.
5.The maximumallowablelinelengthforthisproductis150 feet JustforScrollcompressor .
1.2LIMITATIONS
Theunitshouldbeinstalled in accordancewithall National,Stateand Local Safety
Codesandthe limitationslistedbelow:
As soon asaunitisreceived,itshouldbeinspected forpossible damage duringtransit.
If damage isevident,the extent of thedamageshould benoted on thecarrier's delivery
receipt. Aseparaterequestforinspection bythecarrier's agentshouldbemadein
writing. SeeLocaldistributorformoreinformation.
1.1INSPECTION
LARGESERVICEVALVE
Fig.1Underside ClapboardLocation
4
RequirementsForInstalling/Servicing R410AEquipment
Gauge sets,hoses, refrigerantcontainers,and recoverysystemmustbedesigned
tohandle the POEorPVEtype oils.
Manifoldsetsshouldbe800 PSIGhigh side and250PSIGlow side with550PSIG
Iow side restart.
All hosesmust havea700PSIGservicepressurerating.
Leakdetectorsshouldbedesigned todetectrefrigerant.
Recovery equipment(including refrigerantrecovery containers) mustbe specifi-
callydesigned tohandle R410A.
Donotuse anR-22 TXV.
Itwill be moreconvenienttoopen the Servicevalveafterremoving the Underside
Clpboard.see theFig.1
Underside Clapboard
SMALLSERVICEVALVE

5
FIG.2DIMENSIONS
DIMENSIONALDATA
"H"in. [mm]"W"in. [mm]
"
L
"
i
n
.
[
m
m
]
L
i
q
u
i
d in.
Vapor in.
18
24-15/16[633]
28[710]
28[710]
3
/
8
3
/
4
24 29-1/8[740]
2
9
-
1
/
8
[
7
4
0
]
3
/
8
3
/
4
30 29-1/8[740]
2
9
-
1
/
8
[
7
4
0
]
3
/
8
3
/
4
36 29-1/8[740]29-1/8[740]
3
/
8
7
/
8
42 29-1/8[740]
2
9
-
1
/
8
[
7
4
0
]
3
/
8
7
/
8
ModelSIZE(Btu/h) Dimensions (Inches) Refrigerant Connection
Service Valve Size
24-15/16[633]
24-15/16[633]
33-3/16[843]
33-3/16[843]
AIRDISCHARGE: ALLOW 60
MINIMUMCLEARANCE.
VAPORLINE
CONNECTION
CONTROLWIRING
7/8 (22.2mm)
KNOCKOUT
1-11/32 (34.5mm)
LIQUIDLINE
CONNECTION
SERVICE
FITTING
SERVICE
FITTING
POWERWIRING
SEEDETAILA
DETAILA
HOLE
1-3/32 (27.8mm)
SERVICEACCESS
ALLOW 24 CLEARANCE
AIRINLETS
LOUVEREDPANELS
ALLOW 18
MINIMUM
CLEARANCE
NOTE: GRILLAPPEARANCE
MAYVARY.
W

3.0UNITINSTALLATION
3.1LOCATION
Beforestartingthe installation,selectand check the suitabilityofthe location forboth
the indoorand outdoorunit.Observealllimitationsand clearancerequirements.The
outdoorunit musthavesufficient clearanceforairentrancetothecondensercoil,forair
dischargeandforserviceaccess.See Fig.2
NOTE
Formultipleunitinstallations,unitsmustbe spaced aminimumof18 inches
apart. (Coilfacetocoilface.)
Ifthe unitistobe installedon ahotsun exposed rooforablack-toppedground area,the
unitshouldbe raised sufficientlyabovetherooforgroundtoavoidtakingthe accumu-
lated layerofhot airintothe outdoorunit.
Provide an adequatestructural support.
WARNING
Theoutdoorunit should notbeinstalledin anarea wheremud oricecould cause
personalinjury.
Elevatetheunitsufficientlytopreventanyblockage ofthe airentrancesbysnowin
areaswheretherewill be snowaccumulation.Check the localweatherbureauforthe
expected snow accumulation in yourarea. Isolatethe unitfromraingutters toavoid any
possiblewashoutofthe foundation.
When installingunitsonaroof,thestructuremustbe capableofsupportingthe total
weightofthe unit,including apadded frameunit,rails,etc.,whichshould be used to
minimizethe transmission ofsoundorvibration intotheconditioned space.
3.3ROOFINSTALLATION
3.4UNITPLACEMENT
1.Provide abaseinthe pre-determined location.
2.Removetheshipping cartonandinspectforpossible damage.
3.Compressortie-down boltsshouldremaintightened.
4.Position theuniton thebaseprovided.
Theunitmaybe installed atground levelonasolidbasethatwill notshiftorsettle,caus-
ingstrainon therefrigerant linesandpossibleleaks. Maintaintheclearancesshown in
Fig.2andinstallthe unitin alevel position.
3.2GROUND INSTALLATION
Normal operatingsound levelsmaybe objectionableifthe unit isplaced directlyunder
windowsofcertainrooms(bedrooms,study, etc.).
Top ofunitdischargearea mustbe unrestrictedforat least60inchesabovethe unit.
6

1.Installthe lineswithasfew bendsaspossible.Caremustbetaken nottodamage
thecouplingsorkinkthe tubing.Usecleanharddrawn Coppertubing whereno
appreciable amountofbending around obstructionisnecessary,ifsoft coppermust
be used,caremustbe takentoavoid sharpbendswhichmaycausearestriction.
2.Thelinesshould be installedsothattheywill notobstructserviceaccesstothe coil,
airhandling systemorfilter.
3.5PRECAUTIONSDURINGLINEINSTALLATION
CAUTION
ThissystemusesR410Arefrigerantwhichoperatesathigherpressurethan
R-22.No otherrefrigerantmaybe used in thissystem.Gaugesets,hoses,
refrigerantcontainers,andrecovery systemmustbedesignedtohandle
R410A. Ifyou areunsure,consultthe equipment manufacturer.
Theoutdoorunitmustbeconnectedtotheindoorcoil usingfieldsuppliedrefrigerant
gradecoppertubingthatisinternallyclean and dry. Unitsshouldbeinstalled onlywith
the tubingsizesforapproved systemcombinations.The chargegivenisapplicable for
totaltubing lengthsupto25 feet.
NOTE
Usingalargerthan specifiedline sizecould resultin oilreturnproblems.Using
too small aline will resultin lossofcapacityandotherproblems caused byinsuf-
ficientrefrigerantflow.Slope horizontalvaporlinesatleast1"every 20 feet
towardtheoutdoorunittofacilitateproperoil return.
3.Caremustalsobe takentoisolatethe refrigerantlinestominimizenoisetransmis-
sion fromtheequipmenttothestructure.
4.Thevaporline and liquidline mustbe insulated withaminimumof1/2"foamrubber
insulation (Armafiexorequivalent).Tape and suspendthe refrigerantlinesasshown.
DONOT allowtube metal-to-metal contact.See Fig.3.
5.UsePVCpiping asaconduitforallundergroundinstallationsasshowninFig.4.
Buried linesshould be keptasshort aspossible tominimizethebuild up ofliquid
refrigerantinthe vaporlineduring long periodsofshutdown.
6.Pack fiberglassinsulation and asealingmaterial suchaspermagumaround refrig-
erantlineswheretheypenetrateawall toreducevibrationandtoretainsomeflexi-
bility.
7

InsulatedLiquidLine
Tape
SheetMetalHanger
CorrectIncorrect
Fig.5TypicalInstallation
Fig.3Tubing Hanger
Fig.4Underground Installation
All outdoorunitandevaporatorcoilconnectionsarecopper-to-copperand shouldbe
brazed withaphosphorous-copperalloymaterialsuchasSilfos-5orequivalent. DO
NOTusesoft solder. Theoutdoorunitshavereusableservicevalveson boththeliquid
andvaporconnections.The total systemrefrigerantchargeisretained withinthe
outdoorunitduringshipping and installation. The reusable servicevalvesareprovided
toevacuateandchargeperthisinstruction.
Seriousserviceproblemscanbe avoidedbytaking adequateprecautionstoassurean
internallyclean and drysystem.
3.6PRECAUTIONSDURING BRAZINGOFLINES
8
InsulatedVaporLine
TO
INDOOR
BLOWER
TO
POWER
SUPPLY
TO
COIL
WEATHERPROOF
DISCONNECT
SWITCH
Sealopening(s)with
permagumorequivalent
NOTE:Alloutdoorwiringmustbeweatherproof

CAUTION
Dry nitrogenshould always be supplied through the tubing while itisbeing
brazed,becausethe temperaturerequiredishigh enough tocauseoxidation
ofthe copperunless an inertatmosphereisprovide. The flow of dry nitrogen
shouldcontinueuntil thejointhascooled.Alwaysuseapressureregulator
andsafetyvalvetoinsurethatonlylowpressuredry nitrogen isintroducedinto
the tubing.Onlyasmallflowisnecessary todisplaceairand prevent oxidation.
Precautionsshould be taken topreventheatdamagetoservicevalvebywrapping awet
rag around itasshownin Fig.6.Also,protectall painted surfaces,insulation,during
brazing.Afterbrazing cool joint withwetrag.
3.7PRECAUTIONSDURINGBRAZING SERVICEVALVE
Valvecan be opened byremovingthe plungercap andfullyinserting ahexwrenchinto
the stemandbacking outcounter-clockwiseuntil valvestemjusttouchesthe cham-
fered retaining wall.
1.Removethecap and Schradercorefromboththeliquidandvaporservicevalve
serviceportsatthe outdoorunit.ConnectIow pressurenitrogen tothe liquidline
serviceport.
Connecttherefrigerantlinesusingthe followingprocedure:
2.Brazethe liquid linetothe liquid valveatthe outdoorunit.Besuretowrapthe valve
bodywithawet rag.Allowthe nitrogen tocontinueflowing.RefertotheTabularData
Sheetforproperliquidline sizing.
3.Carefullyremovethe rubberplugsfromthe evaporatorliquidandvaporconnections
atthe indoorcoil.
4.Brazethe liquid linetothe evaporatorliquid connection.Nitrogenshould be flowing
through theevaporatorcoil.
5.Slidethe plasticcap awayfromthevaporconnectionat the indoorcoil.Brazethe
vaporlinetothe evaporatorvaporconnection.RefertotheTable1forpropervapor
linesizing.
6.Protectthe vaporvalvewithawetragandbrazethe vaporline connection tothe
outdoorunit. The nitrogen flowshould be exiting thesystemfromthe vaporservice
portconnection.Afterthisconnection hascooled,removethe nitrogen sourcefrom
theliquidfittingserviceport.
7.Replacethe Schradercoreinthe liquidand vaporvalves.
8.Leaktest all refrigerantpipingconnectionsincludingthe serviceport flarecapstobe
suretheyareleaktight. DONOTOVERTIGHTEN(between40 and60inch-lbs.
maximum).
9.Evacuatethe vaporline, evaporatorandthe liquid line,to500micronsorless.
9
Fig.6Heat Protection
servicevalve
wetrag

10. Replacecaponserviceports. Do notremovethe flarecapsfromthe serviceports
exceptwhen necessaryforservicingthe system.
CAUTION
Do notconnectmanifold gaugesunless troubleissuspected.Approximately3/4
ounceofrefrigerantwillbe losteachtimeastandardmanifold gauge is
connected.
11.Releasetherefrigerantcharge intothe system.Open boththe liquid and vapor
valvesbyremoving theplungercap and withanhexwrenchback outcounter
-clockwiseuntilvalvestemjusttouchesthechamfered retainingwall.
12.Replaceplungercapfingertight,then tightenanadditional1/12 turn(1/2hexflat).
Cap mustbereplaced toprevent leaks.
Table1: RefrigerantConnectionsand Recommended Liquidand VaporTube
Diameters (ln.)
WARNING
Neverattempttorepairanybrazedconnectionswhile thesystemisunderpres-
sure.Personalinjury could result.
See "SystemCharge"section forchecking and recordingsystemcharge.
10
3.8UNITMOUNTING
2.Ifelevatingauniton aflatroof,use4 × 4 (orequivalent)stringers
positioned todistributeunit weightevenlyandpreventnoiseand vibration
(See fig.7).
NOTE:Donotblockdrainopeningsshowninfig.7.
3.Ifunitmustbeelevatedbecauseofanticipatedsnow fall,secureunitand
elevatingstand suchthatunitand/orstand willnottip overorfalloff.
Ifelevatingtheheat pump,eitheronaflatroofor onaslab,observethefollowingguidelines.
1.Thebasepanprovidedelevatestheheat pump2 abovethebasepad.
NOTE:Totiedownunit, see 3.9.
MODELSIZE
LIQUID SUCTION
Tube Diameter Tube Diameter
18 3/8 3/4
24 3/8 3/4
30 3/8 3/4
36 3/8 3/4
42 3/8
48 3/8
60 3/8 7/8
3/4
7/8