Hitachi UTOPIA R32 Series Installation & Operation Manual

8 REFRIGERANT PIPING & REFRIGERANT CHARGE
8.1 PIPING MATERIALS
1 Prepare locally-supplied copper pipes.
2 Select the piping size with the correct thickness and correct
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3 Select clean copper pipes. Make sure there is no dust and
moisture inside. Blow the inside of the pipes with oxygen
free nitrogen to remove any dust and foreign materials
before connecting pipes.
? NOTE
• A system with nomoistureoroilcontaminationwill give maximum
performance and lifecycle compared to that of a poorly prepared
system.Takeparticularcaretoensureallcopperpipingiscleanand
dryinternally.
• Thereisnorefrigerantinthecycleoftheindoorunit.
! CAUTION
• Allexternalpipingshallbeselectedinsizeanddimensionavoiding
anymechanicalstrengthduetocontractionorexpansion,vibrationor
refrigerantpulsation.
• Allthepipingshallbeprotectedagainstanyenvironmentaleffectlike
waterfreezing,corrosion,etc.Whenexiblepipeisused,precautions
shallbetakenagainstmechanicaldamages,excessivestressesby
torsionoranyother.
• Flarenutconnectionsshallbeaccessibleformaintenancepurposes.
• Ensurethatrefrigerantpipingisearthedpriortounitsinterconnection
andincaseofadditionalrefrigerantchargingisrequired.
• Captheendofthepipewhenpipeistobeinsertedthrougha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contamination.
• Do not use insulation material that contains NH
3
 because it can
damagecooperpipematerialandcanbeasourceoffutureleakage.
• Completely insulate both refrigerant gas piping and liquid piping
betweentheindoorunit(s)andtheoutdoorunit.
• Ifnotinsulated,dewwilloccuronthepipingsurface.
After connecting the refrigerant piping, seal the refrigerant
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
Insulate the liquid piping and gas piping completely to avoid
decreasing of performance and dewing on the surface of the
pipe.
8.2 PIPING CONNECTION FOR OUTDOOR UNIT
1 The pipes can be connected from 4 directions. Make holes
in the piping cover or cabinet for taking out pipes. Take the
piping cover away from the unit, and make holes by cutting
along the guideline at the rear of the cover or punching
with a driver. Remove the burr with a cutter, and place a
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Nº Description

Rear side piping work

Pipe Cover

Right side piping work

Bottom side piping work (Knock out hole)

Front side piping work

Piping work

Stop Valve

Removing Direction for Service Cover
(pictureasexample)
! CAUTION
Notestoopen/closetheservicecover:
• Removethescrewsfollowingtheinstructionstotheabovegure.
• Slowlypressdownthecover.
? NOTE
Holdthecoverwithahandtoremovescrewsasthecovermayfalldown.
Service cover
Clasp (3 places)
(pictureasexample)
a. For the front and side piping
Front piping hole
Side piping hole
To use racking or conduit tubes, check the size and
remove part following the slit.
Refrigerant piping & refrigerant charge
PMML0545 rev.2 - 04/2021
9
EN

Hitachi UTOPIA R32 Series Specifications

General

Brand	Hitachi
Model	UTOPIA R32 Series
Category	Air Conditioner
Language	English