Mitsubishi Electronics MXZ-3B24NA Air Conditioner User Manual


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4-3.TESTRUN
• 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possibilityofincorrectwiringandpipingcombination,andconrmingthecombi
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nationisdifcult,usethisfunctiontodetectandcorrectthecombinationbyfollowingtheproce
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dures 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 detec
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tion, the indoor unit automatically stops operation. This is not a malfunction.
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 refriger
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ant. 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(140°F))duringcoldseason.Butneverusenakedreorsteam.
Procedure
Pressthepiping/wiringcorrectionswitch(SW871)1minuteormoreafterturningonthepower
supply.
• Correction completes in 10 to 15 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be
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fore operating this function.
• Thisfunctiondoesnotoperatewhentheoutsidetemperatureis0°C(32°F)orbelow.
LEDindicationduringdetection:
LED
1(Red) 2(Yellow) 3(Green)
Lighted Lighted Blinking
Resultofpiping/wiringcorrectionfunction
LED
Result
1(Red) 2(Yellow) 3(Green)
Lighted Not lighted Lighted
Completed
(Correctedsuccessfully)
Blinking Blinking Blinking Cannot be corrected
Other indications
Refer to “SAFETY PRE-
CAUTIONS WHEN LED
FLASHES”locatedbehind
theservicepanel.
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.
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
Union
Union
D unit is for
4B36NAonly
JG79A417H01_en.indd 6 10/12/2010 9:19:47 AM
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