Mitsubishi MXZ-4E80VAD - Pumping down

En-7
Whenrelocatingordisposingoftheairconditioner,pumpdownthesystemfollowingtheprocedurebelowsothatnorefrigerantisreleasedintotheatmosphere.
1)Turnoffthebreaker.
2)Connectthegaugemanifoldvalvetotheserviceportofthestopvalveonthegaspipesideoftheoutdoorunit.
3)Fullyclosethestopvalveontheliquidpipesideoftheoutdoorunit.
4)Turnonthebreaker.
5)StarttheemergencyCOOLoperationonalltheindoorunits.
6)Whenthepressuregaugeshows0–0.05MPa[Gauge](approx.0–0.5kgf/cm
2
),fullyclosethestopvalveonthegaspipesideoftheoutdoorunitand
stoptheoperation.(Refertotheindoorunitinstallationmanualaboutthemethodforstoppingtheoperation.)
 * Iftoomuchrefrigeranthasbeenaddedtotheairconditionersystem,thepressuremaynotdropto0–0.05MPa[Gauge](approx.0–0.5kgf/cm
2
),or
theprotectionfunctionmayoperateduetothepressureincreaseinthehigh-pressurerefrigerantcircuit.Ifthisoccurs,usearefrigerantcollectingdevice
tocollectalloftherefrigerantinthesystem,andthenrechargethesystemwiththecorrectamountofrefrigerantaftertheindoorandoutdoorunitshave
been relocated.
7)Turnoffthebreaker.Removethepressuregaugeandtherefrigerantpiping.
When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
The compressor may burst and cause injury if any foreign substance, such as air, enters the pipes.
WARNING
5. PUMPING DOWN
4-5. 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combi-
nation,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 malfunction.
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is“Notcompleted”,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0°Corbelow.
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.
4-6. 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.
4-4. LOWERING THE OPERATION NOISE OF THE OUTDOOR UNIT
• Descriptionofthefunction:
 Withthisfunction,theoperatingnoiseoftheoutdoorunitcanbeloweredbyreducingtheoperationload,forexample,duringnighttimeinCOOLmode.
However,pleasenotethatthecoolingandheatingcapacitymaylowerifthisfunctionisactivated.
* Changingthesettingisrequiredtoactivatethisfunction.Pleaseexplainaboutthisfunctiontoyourcustomersandaskthemwhethertheywanttouseit.
SW1
ON
1 2 3 4 5 6
Lowertheoperatingnoise
[How to lower the operating noise]
1)Besure toturn offthe mainpower forthe airconditioner beforemaking the
setting.
2)Setthe“5”ofSW1ontheoutdoorcontrollerboardtoONtoenablethisfunction.
3)Turnonthemainpowerfortheairconditioner.
WG79A696H02_en.indd 7 2016/04/21 14:46:40