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En-6
4-3. TEST RUN
Besuretoalsocheckthefollowing.
Theoutdoorunitisnotfaulty.Whentheoutdoorunitfails,LEDoutdoorunitcontrolpanelblinks.
Boththegasandliquidstopvalvesarecompletelyopen.
• Testrunsoftheindoorunitsshouldbeperformedindividually.Seetheinstallationmanualcomingwiththeindoor
unit,andmakesurealltheunitsoperateproperly.
• Ifthetestrunwithalltheunitsisperformedatonce,possibleerroneousconnectionsoftherefrigerantpipesand
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
Oncethecompressorstops,therestartpreventivedeviceoperatessothecompressorwillnotoperatefor3
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-
sibilityofincorrectwiringandpipingcombination,andconrmingthecombinationisdifcult,usethisfunctionto
detect and correct the combination by following the procedures below.
Makesurethatthefollowingisdone.
• Powerissuppliedtotheunit.
• Stopvalvesareopen.
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)Connectgascylindertotheserviceportofstopvalve.
2) Perform air purge of the pipe (or hose) coming from refrigerant gas cylinder.
3)Replenishspeciedamountoftherefrigerant,whileoperatingtheairconditionerforcooling.
Note:
Incaseofaddingrefrigerant,complywiththequantityspeciedfortherefrigeratingcycle.
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
compressorwillbelocked.
To maintain the high pressure of the gas cylinder, warm the gas cylinder with warm water (under
104°F(40°C))duringcoldseason.Butneverusenakedreorsteam.
Union
Stopvalve
Liquid
pipe
Indoor
unit
Stopvalvewith
serviceport
Gas
pipe
Refrigerant gas
cylinder
operatingvalve
(for R410A)
Gaugemanifold
valve(forR410A)
Charge hose
(for R410A)
Refrigerant gas cylinder for R410A with siphon
Electronic scale for refrigerant charging
Refrigerant (liquid)
Outdoor
unit
Union
Union
Union
Procedure
Press the piping/wiring correction switch (SW871) 1 minute or more after turning on the power supply.
• Correctioncompletesin10to20minutes.Whenthecorrectioniscompleted,itsresultisshown
by LED indication. Details are described in the following table.
• Tocancelthisfunctionduringitsoperation,pressthepiping/wiringcorrectionswitch(SW871)
again.
• Whenthecorrectioncompletedwithouterror,donotpressthepiping/wiringcorrectionswitch
(SW871) again.
Whentheresultwas“cannotbecorrected”,pressthepiping/wiringcorrectionswitch(SW871)again
tocancelthisfunction.Then,conrmthewiringandpipingcombinationinaconventionalmanner
by operating the indoor units one by one.
• Theoperationisdonewhilethepowerissupplied.Makesurenottocontactpartsotherthanthe
switch,includingtheP.C.board.Thismaycauseelectricshockorburnbyhotpartsandliveparts
aroundtheswitch.ContactingthelivepartsmaycauseP.C.boarddamage.
• TopreventelectroniccontrolP.C.boarddamage,makesuretoperformstaticeliminationbefore
operating this function.
• Thisfunctiondoesnotoperatewhentheoutsidetemperatureis32°F(0°C)orbelow.
4-4. EXPLANATION TO THE USER
• UsingtheOPERATINGINSTRUCTIONS,explaintotheuserhowtousetheairconditioner(howtousetheremotecontroller,howtoremovetheairlters,howto
removeorputtheremotecontrollerintheremotecontrollerholder,howtoclean,precautionsforoperation,etc.).
• RecommendtheusertoreadtheOPERATINGINSTRUCTIONScarefully.
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
Referto“SAFETYPRE-
CAUTIONSWHENLED
BLINKS”locatedbehind
theservicepanel.
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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