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Table. B (Diameter of piping used between outdoor unit and first separation
tube or header)
For the following installation conditions, it is necessary to increase the piping size.
• Condition 1: Total indoor unit capacity ratio ˃ 110%
• Condition 2: Between outdoor unit and first separation tube or header ˃ 70 m
If both conditions 1 and 2 are met, condition 2 is followed.
Outdoor
unit
Liquid pipe
Model
cooling
capacity
Stan-
Condi-
[kW]
dard
tion 1
AJ*072
9.52
22.4
LELAH
(3/8)
AJ*090
9.52
12.70
28.0
LELAH
(3/8)
(1/2)
AJ*108
12.70
33.5
LELAH
(1/2)
AJ*126
12.70
40.0
LELAH
(1/2)
AJ*144
12.70
45.0
LELAH
(1/2)
AJ*162
12.70
50.0
LELAH
(1/2)
Table. C (Diameter of piping used between separation tubes)
(If pipe diameter C > B, select pipe size from table B)
Total cooling
Outside diameter [mm (in)]
capacity of indoor
Liquid pipe
unit [kW]
2.2 to 11.1
9.52 (3/8)
11.2 to 13.9
9.52 (3/8)
14.0 to 19.6
12.70 (1/2)
19.7 to 28.0
12.70 (1/2)
28.1 or more
12.70 (1/2)
*4: For the installation method, please refer to the installation manuals for indoor unit,
separation tubes or headers.
Use a standard separation tube for pipe branching. Do not use a T tube as it does not
separate the refrigerant evenly.
Table. D (Diameter of piping used between separation tube and indoor unit)
(If pipe diameter D > C, select pipe size from table C)
Model code of indoor
Cooling capacity of indoor
unit
unit (kW)
04, 07, 09
1.1, 2.2, 2.8
12, 14, 18
3.6, 4.5, 5.6
24, 30, 34, 36, 45,
7.1, 9.0, 10.0, 11.2, 12.5, 14.0,
54, 60
18.0
72, 90
22.4, 25.0
96
28.0
*5: Between separation tube and Indoor unit > 20 m → 12.70 mm (1/2 in).
Table. E (Indoor unit capacity comparison table - The indication of power is
different depending on the model.)
Model code of
04 07 09 12 14 18 24 30 34 36 45 54 60 72 90 96
indoor unit
Capacity [kW]
1.1 2.2 2.8 3.6 4.5 5.6 7.1 9.0 10.0 11.2 12.5 14.0 18.0 22.4 25.0 28.0
In the case of ARXD07GALH: equivalent to model code of indoor unit
Model code 07 → Capacity=2.2kW
4.3. Protection of pipes
Location
Working period
1 month or more
Outdoor
Less than 1 month
Indoor
—
• Protect the pipes to prevent the entry of moisture and dust.
• Especially pay attention when passing the pipes through a hole or connecting the end of
a pipe to the outdoor unit.
Diameter of piping [mm (in)]
Gas pipe
Condi-
Stan-
Condi-
tion 2
dard
tion 1
12.70
19.05
←
←
(1/2)
(3/4)
22.22
←
←
(7/8)
28.58
←
←
←
(1-1/8)
28.58
←
←
←
(1-1/8)
28.58
←
←
←
(1-1/8)
28.58
←
←
←
(1-1/8)
Separation
Header *4
tube *4
Gas pipe
15.88 (5/8)
19.05 (3/4)
UTP-AX054A
UTR-H0906L
UTR-H0908L
19.05 (3/4)
22.22 (7/8)
UTP-AX090A
UTR-H1806L
28.58 (1-1/8)
UTP-AX180A
UTR-H1808L
Outside diameter [mm (in)]
Liquid pipe
Gas pipe
6.35 (1/4)
9.52 (3/8) (*5)
6.35 (1/4)
12.70 (1/2)
9.52 (3/8)
15.88 (5/8)
9.52 (3/8)
19.05 (3/4)
9.52 (3/8)
22.22 (7/8)
Protection method
Pinch pipes
Pinch or tape pipes
Pinch or tape pipes
5. PIPE INSTALLATION
5.1. Brazing
If air or another type of refrigerant enters the refrigera-
tion cycle, the internal pressure in the refrigeration
cycle will become abnormally high and prevent the
unit from exerting its full performance.
Condi-
tion 2
Apply nitrogen gas while brazing the pipes.
22.22
Nitrogen gas pressure: 0.02 MPa (= pressure felt suf-
(7/8)
ficiently on the back of your hand)
←
If a pipe is brazed without applying nitrogen gas, it will create an oxidation film.
This can degrade performance or damage the parts in the unit (such as the compressor
←
or valves).
Do not use flux to braze pipes. If the flux is the chlorine type, it will cause the pipes to
←
corrode.
In addition, if the flux contains fluoride, it will affect the refrigerant piping system due to
←
deterioration of refrigerant oil.
For brazing material, use phosphor copper that does not require flux.
←
5.2. Indoor unit pipe connections
For details, refer to the Installation Instruction Sheet of each part.
Separation tube
A
:
Outdoor unit or Refrigerant
branch kit
B
:
Indoor unit or Refrigerant
branch kit
PROHIBITED
Header
Gas pipe
C
Outdoor
unit side
Liquid pipe
D
Outdoor
unit side
PROHIBITED
Do not connect a separation tube after a header.
Leave the distance 0.5 m or more for straight part to branch tube and header.
Main pipe
Main pipe
CAUTION
Brazing area
CAUTION
Horizontal
B
A
Horizontal line
± 15°
GOOD
Horizontal line
Horizontal line
β
1
α
C
GOOD
View
1
H
1
Horizontal line
Vertical line
α
2
H
2
GOOD
D
View
CAUTION
0.5 m or more
Separation tube
To indoor unit
0.5 m or more
Header
To indoor unit
To indoor unit
Separation tube
0.5 m or more
To indoor unit
0.5 m or more
Header
To indoor unit
Pressure regulating valve
Cap
Nitrogen gas
Vertical
A
B
or
B
A
GOOD
H
= 0 to 10 mm
1
(α
: 0° to 1°)
1
β
: -10° to 10°
1
H
= 0 to 10 mm
2
(α
: 0° to 1°)
2
β
β
: -10° to 10°
2
2
To indoor unit
En-6
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