Panasonic CS-UW12GKE Specifikace Strana 49

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<BrazingMethodforPreventingOxidation>
1.Attachareducingvalvetothenitrogengascylinder.
2.Attachareducingvalvetothenitrogengascylinder.
3.Applyasealontotheclearancebetweenthepipingandinsertedpipeforthenitrogengasinordertopreventthenitrogengas
fromflowingbackward.
4.Whenthenitrogengasisflowing,besuretokeepthepipingendopen.
5.Adjusttheflowrateofnitrogengassothatitislowerthan0.05m
3
/h,or0.02MPa(0.2kgf/cm
2
)bymeansofthereducingvalve.
6.Aftertakingthestepsabove,keepthenitrogengasflowinguntilthepipingcoolsdowntoacertainextent(i.e.temperatureat
whichpipesaretouchablewithfinger).
7.Completelyremovethefluxafterbrazing.
Cautionsduringbrazing
1.GeneralCautions
a.Thebrazingstrengthshouldbehighasrequired.
b.Afteroperation,airtightnessshouldbekeptunderpressurizedcondition.
c.Duringbrazingdonotallowcomponentmaterialstobecomedamagedduetooverheating.
d.Therefrigerantpipeworkshouldnotbecomeblockedwithscaleorflux.
e.Thebrazedpartshouldnotrestricttheflowintherefrigerantcircuit.
f.Nocorrosionshouldoccurfromthebrazedpart.
2.PreventingofOverheating
Duetoheating,theinteriorandexteriorsurfacesoftreatedmetalmayoxidize.Especially,whentheinterioroftherefrigerant
circuitoxidizesduetooverheating,scaleoccursandstaysinthecircuitasdust,thusexertingafatallyadverseeffect.So,
makebrazingatadequatebrazingtemperatureandwithminimumofheatingarea.
3.OverheatingProtection
Inordertopreventcomponentsnearthebrazedpartfromoverheatingdamagedorqualitydeteriorationduetoflameorheat,
takeadequatestepsforprotectionsuchas(1)byshieldingwithametalplate,(2)byusingawetcloth,and(3)bymeans
ofheatabsorbent.
4.MovementduringBrazing
Eliminateallvibrationduringbrazingtoprotectbrazedjointsfromcrackingandbreakage.
5.OxidationPreventative
Inordertoimprovethebrazingefficiency,varioustypesofantioxidantareavailableonthemarket.However,the
constituentsofthesearewidelyvaried,andsomeareanticipatedtocorrodethepipingmaterials,oradverselyaffectHFC
refrigerant,lubricatingoil,etc.Exercisecarewhenusinganoxidationpreventive.
10.4.7.ServicingTips
Thedriermustalsobereplacedwheneverreplacingtherefrigerantcycleparts.Replacingtherefrigerantcyclepartsfirst
beforereplacingthedrier.Thedrierissuppliedinavacuumpack.Performbrazingimmediatelyafteropeningthevacuum
pack,andthenstartthevacuumwithintwohours.Inaddition,thedrieralsoneedstobereplacedwhentherefrigeranthas
leakedcompletely.
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