Technical Information

Piping work and
refrigerant charge
TCGB0079 rev.0 - 01/2013
120
9.3.2 Pipe connection
Fix the connecting pipe as shown in the gure below. Use the insulation attached to the indoor unit.
A. Use the are nut of the indoor unit.
B. Insulate this part with the insulation material supplied.
C. Fix this part with the bracket supplied or with tape.
D. Refrigerant piping in the installation.
E. Field-supplied insulation.
F. Brazing.
G. Make ares after attaching are nut to the connecting pipe in
the Multikit package.
H. Insulation attached to indoor unit.
I. Indoor unit.
N O T E
• 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.
C A U T I O N
• 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.
9.3.3 Insulation
Attach insulation package with the Multikit to each branch 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.
N O T E
• 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.
C A U T I O N
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.
TCGB0079_rev0_11-2012.indb 120 29/01/2013 14:27:31