Hitachi RAS-8-FSNM - REFRIGERANT PIPING & REFRIGERANT CHARGE; PIPING MATERIALS

ENGLISH
CORRECT
Frame
Outdoor Unit
is Stable.
Base Without of Outdoor Unit
100mm
Metal Plate
Metal Plate
100mm or more
Recommended Metal Plate Size (Field-Supplied)
Material: Hot-Rolled Mild Steel Plate (SPHC)
Plate Thickness: 4.5T
2-Long Hole
4-C10
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
material which can have sufcient pressure strength.
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.
! CAUTION
• 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.
• Ensuretoconnectthepipingamongtheunitsinthesamerefrigerant
cycle.
• Do not use insulation material that contains NH3 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.
! DANGER
• UserefrigerantR410Aintherefrigerantcycle.
• Do not charge oxygen, acetylene or other ammable and
poisonousgasesintotherefrigerantcyclewhenperforminga
leakagetestoranair-tighttest.
• Thesetypesofgasesareextremelydangerousandcancausean
explosion.Itisrecommendedthatcompressedair,nitrogenor
refrigerantbeusedforthesetypesoftests.
• Checktoensurethatnopressureexistsinsidethestopvalve
beforeremovingtheange.
? 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.
• Donotplacethepipedirectlyontheground.
Correct
Hole Hole
Attach a cap or vinyl tape
Incorrect
Correct
Rain water can enter
Attach a cap or vinyl bag
with rubber band.
Incorrect
Correct
Attach a cap or vinyl tape
Incorrect
8.2 PIPING CONNECTION FOR OUTDOOR UNIT

Gas pipe accessory (8 and 10 HP)
The gas pipe accessory with a are nut (factory-supplied silencer) shall be brazed to the eld supplied gas line, and connected to
the gas valve.
REFRIGERANT PIPING & REFRIGERANT CHARGE
PMML0390B REV.0 - 11/2015 - P5416649
11