Hitachi YUTAKI RWM-2R1E Instruction Manual

2 Mount the piping cover in order to avoid water entering into
the unit. Seal the holes where pipes and wires are inserted,
by using a insulation (eld-supplied).
3 If the eld-supplied piping is connected with stop valves
directly, it is recommended use a tube bender.
4 Check to ensure that the stop valves are closed completely
before connecting pipes.
5 Connect the eld supplied refrigerant pipes to the indoor unit
and outdoor unit. Apply the oil thinly at the seat are nut and
pipe before tightening.
6 After connecting the refrigerant piping, seal the open space
between knockout hole and refrigerant pipes by using
insulation material.
7 Operation of stop valve should be performed according to
the gure below.
Outdoor unit stop valve
Spindle Type Ball Type
Liquid Gas
(a)

Spindle valve

Flare nut

Cap

Check joint for service port
Closed upon factory shipping
Tightening Torque (Nm)
   
Liquid valve 7-9
40
10HP: 60
33-42
14-18
Gas valve 9-11
80
8/10HP: 100
(4-10)HP: 20-25
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.
Position to apply
spanners.
Do not apply two
spanners work
here.
Spindle type Ball type
! 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.
8.3 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0.05MPa.Ifa
excessivelyhighpressureisappliedtoapipe,itwillcauseanexplosion.
REFRIGERANT PIPING & REFRIGERANT CHARGE
PMML0372B rev.5 - 01/2021
10

Hitachi YUTAKI RWM-2R1E Specifications

General

Brand	Hitachi
Model	YUTAKI RWM-2R1E
Category	Air Conditioner
Language	English