Hitachi RAS-3HVNC1 - 13 UNITS INSTALLATION; 13.1 OUTDOOR UNITS INSTALLATION

ENGLISH
Spindle Type
Stop valve (liquid)
Stop
valve
(gas)
Closed upon factory shipping
Outdoor unit
Tightening Torque (Nm)
   
Gas
valve
Liquid
valve
Gas
valve
Liquid
valve
Gas
valve
Liquid
valve
Gas
valve
Liquid
valve
RAS-(2-2.5)HVNP1 7-9 7-9 34-42 34-42 33-42 33-42 14-18 14-18
RAS-3HVNC1 9-11 7-9 68-82 34-42 33-42 33-42 14-18 14-18
RAS-3HVRNS3 9-11 7-9 68-82 34-42 33-42 33-42 14-18 14-18
 Spindle valve
 Flare nut
 Cap
 Check joint for service port
Refrigerant pressure
Closed before shipment
Refrigerant piping
Hexagonal wrench
(eld supplied) (*)
Spindle valve
Tighten the spindle with a torque above:
Counterclockwise…. Open
Clockwise …. Close
Check joint
(Only charging hose can
be connected)
Tighten the cap with 16 N.m torque
Cap
Tighten the cap with 37 N.m torque
(Attach this after work)
Hexagonal wrench size used for spindle valve:
(*) Size
2HP, 2.5HP 3HP
Gas valve 4 mm 5 mm
Liquid valve 4 mm 4 mm
Do not apply two
spanners at this
position. If applied,
leakage will occur
Stop valve
(Spindle type)
Flare nut
Use two spanners here
for pipe connection
Do not work with two
spanners here.
Refrigerant leakage
shall occur
! CAUTION
• Atthetestrun,fullyopenthespindleandballstopvalve.
• Ifnotfullyopened,thedeviceswillbedamaged.
• Donotattempttoturnservicevalverodbeyonditsstop.
• Donotloosenthestopring.Ifthestopringisloosened,itisdangerous
sincethespindlewillhopout.
• Anexcessorashortageofrefrigerantisthemaincauseoftrouble
totheunits.Chargethecorrectrefrigerantquantityaccordingtothe
descriptionoflabelattheinsideofservicecover.
• Checkforrefrigerantleakageindetail.Ifalargerefrigerantleakage
occurs,itwillcausedifcultywithbreathingorharmfulgaseswould
occurifarewasbeingusedintheroom.
8.2.2 Connecting are adapter
Flare nut (accessories)
Pipe (accessories)
Indoor unit
Flare adapter (accessories)
Gas line
Pipe
(eld
supplield)
Liquid line
The piping sizes for indoor unit and outdoor unit are different.
Attach the are adapter (accessories) at the indoor piping union
part.
Use the adequate are adapter as follows:
Indoor unit
Flare adapter
Gas pipe Liquid pipe
2.0 HP
Big size
(∅15.88→∅12.70)
-
2.5 HP
Big size
(∅15.88→∅12.70)
Small size
(∅9.52→∅6.35)
8.3 BRAZING WORK
! CAUTION
• Usenitrogengasforblowingduringpipebrazing.Ifoxygen,acetyleneoruorocarbongasisused,itwillcauseanexplosionorpoisonousgas.
• A lot ofoxidationlmwilloccurinsideof tubes ifnonitrogengasblowingisperformed during brazingwork.Thislmwillbeecked off after
operationandwillcirculateinthecycle,resultingincloggedexpansionvalves,etc.Thiswillcausebadinuencetothecompressor.
• Useareducervalvewhennitrogengasblowingisperformedduringbrazing.Thegaspressureshouldbemaintainedwithin0.03to0.05MPa.Ifa
excessivelyhighpressureisappliedtoapipe,itwillcauseanexplosion.
REFRIGERANT PIPING & REFRIGERANT CHARGE
PMML0398B rev.0 - 11/2015 - P5416651
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