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9 Piping work and refrigerant charge

Copper pipes, sizes and connection

TCGB0136 rev.1 - 05/2021

? NOTE

• Donotusesaws,grindstoneorothertoolswhichmightcreatecopperdust.

• Whencuttingpipes,securetheparttobesolderedasshownintheServiceManual.

• Strictlyfollownationalorlocalregulationsregardingoccupationalhealthandsafety.

• Wearappropriatemeansofprotectionduringcuttingorbrazingoperationsandinstallation(gloves,eyeprotection,etc).

? NOTE

• Asystemwithnomoistureoroilcontaminationwillgivemaximumperformanceandlife-cycleascomparedwithapoorlyprepared

system.Takeparticularcaretoensurethatallcopperpipingiscleananddryinternally.

• Toensurethis,blowoxygenfreenitrogenthroughthepipes.

! CAUTION

• Captheendofthepipewhenthepipeistobeinsertedthroughahole.

• Donotplacepipesdirectlyonthegroundwithoutacaporvinyltapecoveringtheend,asitshowninthegure.

Right Wrong

• Ifpipinginstallationcannotbecompleteduntilthefollowingdayorlonger,soldertheendsofthepipingtoclosethemandloadwith

oxygen-freenitrogenusinganaccessdevicesuchasaSchradervalvetoavoidmoistureandcontaminationbyextraneousparticles.

• DonotuseinsulationmaterialcontainingNH3asitcandamagethecopperpipingmaterialandmaybeasourceoffutureleakage.

9.3.2 Insulation

Attach insulation to Multikit branch (eld-supplied or package with each one depending on model) using vinyl tape. Also

attach insulation to eld-supplied piping to prevent capacity decrease due to ambient air conditions and dewing on pipe

surface caused by low pressure.

? NOTE

Whenpolyethylenefoamisapplied,athicknessof10mmfortheliquidpipingandfrom15mmto20mmforthegaspipingisrecommended.

! CAUTION

Performinsulationworkafterthesurfacetemperaturedecreasestotheroomtemperature,Ifnot,theinsulationmaterialmaymelt.Ifthe

endsofthepipingsystemareopenafternishingtheinstallationwork,securelyattachcapsorvinylbagstotheendsofthepipingto

preventmoistureordustentering.

Hitachi UTOPIA RAS-4 Series Technical Catalogue

Other manuals for Hitachi UTOPIA RAS-4 Series