Hitachi RAS-(4-12)HNP(1)(E) - Insulation

3 Piping work and
refrigerant charge
63
SMGB0087 rev.0 - 12/2013
3
 C A U T I O N
• Captheendofthepipewhenpipeistobeinsertedthroughawallhole.
• Donotputpipesonthegrounddirectlywithoutacaporvinyltapeattheendofthepipe.
• Ifpipinginstallationisnotcompleteduntilnextdayoroveralongerperiodoftime,brazeofftheendsofthepipingand
chargewithoxygenfreenitrogenthroughaSchradervalvetypeaccessttingtopreventmoistureandparticleconta-
mination.
• DonotuseinsulationmaterialthatcontainsNH3,asitcandamagecopperpipematerialandbecomeasourceoffuture
leakage.
• Insulatetheunionsandare-nutsatthepipingconnectionpartcompletely.
• Completelyinsulatebothrefrigerantgasandliquidpipingbetweentheindoorunitandtheoutdoorunittoavoidade-
creaseofperformance;ifnot,dewwilloccuronthepipingsurface.
• RefrigerantcircuitandWatercircuitmustbeperformedandinspectedbyalicensedtechnicianandmustcomplywith
allrelevantEuropeanandnationalregulations.

Insulation
Attach the pipe insulation to each branch using vinyl tape. Attach also insulation to eld supplied pipes in order to prevent
the capacity decrease according to the ambient air conditions and dewing on the low pressure pipe surface.
1. Cap.
2. Field supplied insulation.
3. Do not make a gap.
 N O T E
Whenpolyethylenefoamisapplied,itisrecommended
the usage of a wall thickness of 10 mm for the liquid
pipingand15mmto20mforthegaspiping.
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 C A U T I O N
• Performtheinsulationworkafterthepipesurfacetemperaturedecreasestotheroomtemperature,ifnottheinsulation
materialmaymelt.
• Iftheendsofthepipingsystemareopenafterendingthepipingwork,attachcapsorvinylbagssecurelytotheends
ofthepiping,avoidingmoistureanddustentering.