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1
Always use the nitrogen.(not use oxygen, carbon dioxide, and a
Chevron gas): Please use the following nitrogen pressure
0.02Mpa (2.9psi) Oxygen – Promotes oxidative degradation of re-
frigerant oil. Because it is flammable, it is strictly prohibited to
use Carbon dioxide – Degrade the drying characteristics of gas
Chevron Gas – Toxic gas occurs when exposed to direct flame.
2 Always use a pressure reducing valve.
3 Please do not use commercially available antioxidant.
The residual material seems to be the oxide scale is ob-
served. In fact, due to the organic acids generated by oxida-
tion of the alcohol contained in the anti-oxidants, ants nest
corrosion occurs. (causes of organic acid
’
alcohol + copper
+ water + temperature)
CAUTION
!
9
ENGLISH
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
Cautions in pipe connection/valve operation
WARNING
After completing work, securely tighten both service ports and
caps so that gas does not leak.
!
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.
!
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 70mm(2-3/4”)]
CLOSE OPEN
Elbow
Ball Valve(Gas Pipe)
Ball Valve
(Liquid Pipe)
Liquid pipe
Gas pipe
REFRIGERANT PIPING INSTALLATION
① Pipe joint (auxiliary parts): Securely perform brazing with a nitrogen
blow into the service port.(Releasing pressure : 0.02 MPa(2.9psi) or
less)
② Cap: Remove caps and operate valve, etc. After operation, always
reattach caps (tightening torque of valve cap: 25Nm (250kg-cm) 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: 14Nm (140kg-cm) or more).
④ Liquid pipe
⑤ Gas pipe
⑥ Elbow joint (field supply)
Connection of Outside units
AB
ABC
(Master) (Slave1)
(Master) (Slave1) (Slave2)
2 Unit
3 Unit
ARCNN21
ARCNN31
A
Outside units Model
Gas Pipe
Liquid Pipe
111(4-3/8)
130(5-1/8)
416(16-3/8)
408(16-1/16)
I.D.28.58(1-1/8) I.D.28.58(1-1/8)
I.D.34.9(1-3/8)
I.D.41.3(1-5/8)
I.D.38.1
(1-1/2)
O.D.34.9(1-3/8)
I.D.31.8(1-1/4)
I.D.22.2(7/8)
I.D.28.58(1-1/8)
I.D.15.88(5/8) I.D.15.88(5/8)
I.D.15.88(5/8)
I.D.19.05(3/4)
I.D.12.7
(1/2)
I.D.12.7(1/2)
I.D.9.52
(3/8)
331(13-1/32)
83
(3-9/32)
70(2-3/4)
314(12-3/8)
I.D.22.2(7/8)
O.D.19.05(3/4)
341(13-7/16)
111(4-3/8)
125(4-29/32)
298(11-23/32)
I.D.34.9(1-3/8)
I.D.41.3(3/4)
I.D.41.3(1-5/8)
O.D.34.9(1-3/8)
I.D.28.58(1-1/8)
334(13-5/32)
281(11-1/16)
I.D.15.88(5/8)
I.D.19.05(3/4)
I.D.19.05(3/4)
I.D.12.7(1/2)
83
(3-9/32)
I.D.22.2
(7/8)
* Install the branch pipe between outside units so that the outlet pipe
is parallel to the surface.
Viewed from point A
in direction of arrow
Within +/- 10°
Do not cut for
70mm(2-3/4”) or less
Execute the
welding while
pouring
nitrogen
When installing the branch pipe vertically between the outside
units, the refrigerant can be uneven between the outside units,
leading to compressor burn and reduced capacity.
CAUTION
!
CAUTION
1 Use the following materials for refrigerant piping.
• Material: Seamless phosphorous deoxidized copper pipe
• Wall thickness : Comply with the relevant local and national regu-
lations for the designed pressure
3.8MPa(551.14psi). We recommend the follow-
ing table as the minimum 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 enter-
ing 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.
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)
44.45
(1-3/4)
53.98
(2-1/8)
Minimum thickness
[mm(inch)]
0.8
(1/32)
0.8
(1/32)
0.8
(1/32)
0.99
(5/128)
0.99
(5/128)
0.99
(5/128)
0.99
(5/128)
0.99
(5/128)
1.1
(3/64)
1.21
(3/64)
1.35
(7/128)
1.43
(7/128)
1.55
(1/16)
2.1
(11/128)
h Remove the front panel before pipe
connection
h Must check the pipe (liquid pipe, gas
pipe) before pipe connection
Unit : mm(inch)
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