MXZ2C20NAHZ3U1 User Manual

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En-6

4-3. TEST RUN

Besuretoalsocheckthefollowing.

 Theoutdoorunitisnotfaulty.Whentheoutdoorunitfails,LEDoutdoorunitcontrolpanelblinks.

 Boththegasandliquidstopvalvesarecompletelyopen.

• Testrunsoftheindoorunitsshouldbeperformedindividually.Seetheinstallationmanualcomingwiththeindoor

unit,andmakesurealltheunitsoperateproperly.

• Ifthetestrunwithalltheunitsisperformedatonce,possibleerroneousconnectionsoftherefrigerantpipesand

the indoor/outdoor unit connecting wires cannot be detected. Thus, be sure to perform the test run one by one.

About the restart protective mechanism

Oncethecompressorstops,therestartpreventivedeviceoperatessothecompressorwillnotoperatefor3

minutes to protect the air conditioner.

Wiring/piping correction function

This unit has a wiring/piping correction function which corrects wiring and piping combination. When there is pos-

sibilityofincorrectwiringandpipingcombination,andconrmingthecombinationisdifcult,usethisfunctionto

detect and correct the combination by following the procedures below.

Makesurethatthefollowingisdone.

• Powerissuppliedtotheunit.

• Stopvalvesareopen.

Note:

During detection, the operation of the indoor unit is controlled by the outdoor unit. During detection, the indoor unit automatically stops operation. This is not a mal-

function.

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refrigerating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

104°F(40°C))duringcoldseason.Butneverusenakedreorsteam.

Union

Stopvalve

Liquid

pipe

Indoor

unit

Stopvalvewith

serviceport

Gas

pipe

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)

Outdoor

unit

Union

Procedure

Press the piping/wiring correction switch (SW871) 1 minute or more after turning on the power supply.

• Correctioncompletesin10to20minutes.Whenthecorrectioniscompleted,itsresultisshown

by LED indication. Details are described in the following table.

• Tocancelthisfunctionduringitsoperation,pressthepiping/wiringcorrectionswitch(SW871)

again.

• Whenthecorrectioncompletedwithouterror,donotpressthepiping/wiringcorrectionswitch

(SW871) again.

Whentheresultwas“cannotbecorrected”,pressthepiping/wiringcorrectionswitch(SW871)again

tocancelthisfunction.Then,conrmthewiringandpipingcombinationinaconventionalmanner

by operating the indoor units one by one.

• Theoperationisdonewhilethepowerissupplied.Makesurenottocontactpartsotherthanthe

switch,includingtheP.C.board.Thismaycauseelectricshockorburnbyhotpartsandliveparts

aroundtheswitch.ContactingthelivepartsmaycauseP.C.boarddamage.

• TopreventelectroniccontrolP.C.boarddamage,makesuretoperformstaticeliminationbefore

operating this function.

• Thisfunctiondoesnotoperatewhentheoutsidetemperatureis32°F(0°C)orbelow.

4-4. EXPLANATION TO THE USER

• UsingtheOPERATINGINSTRUCTIONS,explaintotheuserhowtousetheairconditioner(howtousetheremotecontroller,howtoremovetheairlters,howto

removeorputtheremotecontrollerintheremotecontrollerholder,howtoclean,precautionsforoperation,etc.).

• RecommendtheusertoreadtheOPERATINGINSTRUCTIONScarefully.

LED indication during detection:

LED1

(Red)

LED2

(Yellow)

LED3

(Green)

Lighted Lighted Once

Result of piping/wiring correction function

LED1

(Red)

LED2

(Yellow)

LED3

(Green)

Result

Lighted Not lighted Lighted

Completed

(Problem corrected or

normal)

Once Once Once

Not completed

(Detection failed)

Other indications

Referto“SAFETYPRE-

CAUTIONSWHENLED

BLINKS”locatedbehind

theservicepanel.

Model Indoor unit

MXZ-2C

A – B

MXZ-3C

A – C

MXZ-5C

A – E

SW871

LED

BH79A240H02_en.indd 6 2016/03/24 14:46:29

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User Manual - Page 7