8
ENGLISH
WARNING
Always use extreme care to prevent the refrigerant gas (R410A)
from leakage while using fire or flame. If the refrigerant gas
comes in contact with the flame from any source, such as a gas
stove, it breaks down and generates a poisonous gas which can
cause gas poisoning. Never perform brazing in an unventilated
room. Always conduct an inspection for gas leakage after installa-
tion of the refrigerant piping has been completed.
① Pipe joint (auxiliary parts): Securely perform brazing with a nitrogen
blow into the service valve port.(Releasing pressure : 0.02 MPa (2.9
psi) or less)
② Cap: Remove caps and operate valve, etc. After operation, always
reattach caps (tightening torque of valve cap: 25 N·m(221 lbf·in) or
more). (Don't remove the internal part of the port)
③ Service port: Make the refrigerant pipe vacuum and charge it using
the service port. Always reattach caps after completing work (tight-
ening torque of service cap: 14 N·m (124 lbf·in) or more).
④ Liquid pipe
⑤ Gas pipe
!
WARNING
After completing work, securely tighten both service ports and
caps so that gas does not leak.
!
Open status when both the pipe and the
valve are in a straight line.
Cut both the pipe and the
valve with a cutter to suit the
length (Don't cut the length
of less than 70 mm(2.8 inch))
CLOSE OPEN
Ball Valve(Gas Pipe)
22.2 : brazing type
19.05 : flare type
Ball Valve(Liquid Pipe)
6. If the diameters of the branch piping of the designated refrigerant
piping differs, use a pipe cutter to cut the connecting section and
then use an adapter for connecting different diameters to connect
the piping.
7. Always observe the restrictions on the refrigerant piping (such as
rated length, difference in height, and piping diameter).
Failure to do so can result in equipment failure or a decline in heat-
ing/cooling performance.
8. A second branch cannot be made after a header. (These are shown
by .)
Outer
diameter
[mm(inch)]
6.35
(1/4)
9.52
(3/8)
12.7
(1/2)
15.88
(5/8)
19.05
(3/4)
22.2
(7/8)
25.4
(1)
28.58
(1-1/8)
31.8
(1-1/4)
34.9
(1-3/8)
38.1
(1-1/2)
41.3
(1-5/8)
Minimum
thickness
[mm(inch)]
0.8
(0.0315)
0.8
(0.0315)
0.8
(0.0315)
0.99
(0.039)
0.99
(0.039)
0.99
(0.039)
0.99
(0.039)
0.99
(0.039)
1.1
(0.043)
1.21
(0.048)
1.35
(0.053)
1.43
(0.056)
Y branch
Header
4 branch 7 branch 10 branch
ARBLN01621, ARBLN03321,
ARBLN07121, ARBLN14521
ARBL054 ARBL057 ARBL1010
ARBL104 ARBL107 ARBL2010
To Outdoor Unit
Sealed Piping
A
A
B
A
B
Caution
1. Use the following materials for refrigerant piping.
• Material: Seamless phosphorous deoxidized copper pipe
• Wall thickness : Comply with the relevant local and national regula-
tions for the designed pressure 3.8Mpa(551.1psi).
We recommend the following table as the mini-
mum wall thickness.
2. Commercially available piping often contains dust and other materi-
als. Always blow it clean with a dry inert gas.
3. Use care to prevent dust, water or other contaminants from entering
the piping during installation.
4. Reduce the number of bending portions as much as possible, and
make bending radius as big as possible.
5. Always use the branch piping set shown below, which are sold sep-
arately.
Cautions in pipe connection/valve operation
REFRIGERANT PIPING INSTALLATION
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