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

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.

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

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

FIG.2DIMENSIONS

DIMENSIONALDATA

"H"in. [mm]"W"in. [mm]

[

]

d in.

Vapor in.

24-15/16[633]

28[710]

24 29-1/8[740]

[

]

30 29-1/8[740]

[

]

36 29-1/8[740]29-1/8[740]

42 29-1/8[740]

[

]

ModelSIZE(Btu/h) Dimensions (Inches) Refrigerant Connection

Service Valve Size

24-15/16[633]

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.

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.

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.

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

InsulatedVaporLine

INDOOR

BLOWER

POWER

SUPPLY

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.

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.

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

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