MXZ-3E54VAD User Manual

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4-1. PURGING PROCEDURES AND LEAK TEST

4-2. GAS CHARGE

Performgaschargetounit.

1)Connectgascylindertotheserviceportofstopvalve.

2)Performairpurgeofthepipe(orhose)comingfromrefrigerantgascylinder.

3)Replenishspeciedamountoftherefrigerant,whileoperatingtheairconditioner

forcooling.

Note:

Incaseofaddingrefrigerant,complywiththequantityspeciedfortherefrigerat-

ingcycle.

CAUTION:

Whenchargingtherefrigerantsystemwithadditionalrefrigerant,besuretouseliquid

refrigerant.Addinggasrefrigerantmaychangethecompositionoftherefrigerantin

thesystemandaffectnormaloperationoftheairconditioner.Also,chargetheliquid

refrigerantslowly,otherwisethecompressorwillbelocked.

Tomaintainthehighpressureofthegascylinder,warmthegascylinderwithwarm

water(under40°C)duringcoldseason.Butneverusenakedreorsteam.

1)Removeserviceportcapofstopvalveonthesideoftheoutdoorunit

gaspipe.(Thestopvalvesarefullyclosedandcoveredincapsin

theirinitialstate.)

2)Connectgaugemanifoldvalveandvacuumpumptoserviceportof

stopvalveonthegaspipesideoftheoutdoorunit.

3)Runthevacuumpump.(Vacuumizeformorethan15minutes.)

4)Checkthevacuumwithgaugemanifoldvalve,thenclosegauge

manifoldvalve,andstopthevacuumpump.

5)Leaveasitisforoneortwominutes.Makesurethepointerofgauge

manifoldvalveremainsinthesameposition.Conrmthatpressure

gaugeshows-0.101MPa[Gauge](-760mmHg).

6)Removegaugemanifoldvalvequicklyfromserviceportofstopvalve.

7)

Fullyopenallstopvalvesonthegaspipeandtheliquidpipe.Operating

withoutfullyopeninglowerstheperformanceandthiscausestrouble.

8)Referto1-2.,andchargetheprescribedamountofrefrigerantif

needed.Besuretochargeslowlywithliquidrefrigerant.Otherwise,

compositionoftherefrigerantinthesystemmaybechangedand

affectperformanceoftheairconditioner.

9)Tightencapofserviceporttoobtaintheinitialstatus.

)Leaktest

Union

Stop valve

Liquid

pipe

Indoor

unit

Stop valve with

service port

Gas

pipe

Outdoor

unit

Union

Model Indoor unit

MXZ-2E

–

MXZ-3E

–

MXZ-4E

–

Refrigerantgas

cylinder

operatingvalve

(forR410A)

Gaugemanifold

valve(forR410A)

Chargehose

(forR410A)

RefrigerantgascylinderforR410Awithsiphon

Electronicscaleforrefrigerantcharging

Refrigerant(liquid)

Stopvalve

forGAS

Stopvalvecap

(Torque19.6to

29.4N•m,200

to300kgf•cm)

Gaugemanifold

valve(forR410A)

Compoundpressure

gauge(forR410A)

–0.101MPa

(–760mmHg)

Handle

Low

HandleHigh

Vacuumpump

(forR410A)

*Close

*Open

Hexagonalwrench

*4to5turns

Stopvalve

forLIQUID

Pressuregauge

(forR410A)

Precautionswhenus-

ingthecontrolvalve

Whenattachingthecontrolvalve

totheserviceport,valvecoremay

deformorloosenifexcesspres-

sureisapplied.Thismaycause

gasleak.

Serviceport

Chargehose

(forR410A)

Body

Open

Control

valve

Whenattachingthecontrolvalveto

theserviceport,makesurethatthe

valvecoreisinclosedposition,and

then tighten part A. Do not tighten

partA orturnthe bodywhen valve

coreisinopenposition.

Serviceportcap

(Torque13.7to

17.7N•m,140to

180kgf•cm)

Chargehose

(forR410A)

4-3. REMOVING THE MAINTENANCE PANEL

ThesettingofDipSwitchontheoutdoorcontrollerboardcanbechangedwithout

removingthefrontpanel.

FollowtheproceduresbelowtoremovethemaintenancepanelandsettheDip

Switch.

1)Removescrew(s)whichxthemaintenancepanel.

2)Removethemaintenancepanel,andperformnecessarysettings.

3)Installthemaintenancepanel.

Note:

Makesuretoxthemaintenancepanelsecurely.Incompleteinstallationcould

causemalfunction.

Maintenancepanel

4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN

3-2. PIPE CONNECTION

1)Applyathincoatofrefrigerationoil(G)tothearedendsofthepipesandthepipecon-

nectionsoftheoutdoorunit.Donotapplyrefrigerationoilonscrewthreads.Excessive

tighteningtorquewillresultindamageonthescrew.

2)Alignthecenterofthepipewiththatofthepipeconnectionsoftheoutdoorunit,thenhand

tightenthearenut3to4turns.

3)Tightenthearenutwithatorquewrenchasspeciedinthetable.

•Over-tighteningmaycausedamagetothearenut,resultinginrefrigerantleakage.

•Besuretowrapinsulationaroundthepiping.Directcontactwiththebarepipingmay

resultinburnsorfrostbite.

3-3. INSULATION AND TAPING

1)Coverpipingjointswithpipecover.

2)Foroutdoorunitside,surelyinsulateeverypipingincludingvalves.

3)Usingpipingtape(E),applytapingstartingfromtheentryofoutdoorunit.

• Stoptheendofpipingtape(E)withtape(withadhesiveagentattached).

•

Whenpipinghavetobearrangedthroughaboveceiling,closetorwherethetemperature

andhumidityarehigh,windadditionalcommerciallysoldinsulationtopreventcondensation.

When installing the unit, securely

connect the refrigerant pipes before

starting the compressor.

When there are the ports which are

not used, make sure their nuts are

tightened securely.

WARNING

CAUTION

BN79A289H01_en.indd 5 2016/04/20 14:53:01

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User Manual - Page 6