En-6
Table. B (Diameter of piping used between outdoor unit and first separation
tube or header)
MODEL
Outdoor unit cool-
ing capacity [kW]
Diameter of piping [mm (in)]
Liquid pipe
Gas pipe
AJ*126LELAH
40.0
12.7 (1/2)
28.58 (1-1/8)
AJ*144LELAH
45.0
12.7 (1/2)
28.58 (1-1/8)
Table. C (Diameter of piping used between separation tubes)
(If pipe diameter C > B, select pipe size from table B)
Total cooling
capacity of indoor
unit [kW]
Outside diameter [mm (in)]
Separation
tube *4
Header *4
Liquid pipe
Gas pipe
1.1 to 11.1
9.52 (3/8)
15.88 (5/8)
UTP-AX054A
UTR-H0906L
UTR-H0908L
11.2 to 13.9
9.52 (3/8)
19.05 (3/4)
14.0 to 28.0
12.70 (1/2)
22.22 (7/8)
UTP-AX090A
28.1 or more
12.70 (1/2)
28.58 (1-1/8)
UTP-AX180A
UTR-H1806L
UTR-H1808L
*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
unit
Cooling capacity of indoor
unit (kW)
Outside diameter [mm (in)]
Liquid pipe
Gas pipe
04, 07, 09
1.1, 2.2, 2.8
6.35 (1/4)
9.52 (3/8) (*5)
12, 14, 18
3.6, 4.5, 5.6
6.35 (1/4)
12.70 (1/2)
24, 30, 34, 36, 45,
54, 60
7.1, 9.0, 10.0, 11.2, 12.5, 14.0,
18.0
9.52 (3/8)
15.88 (5/8)
72, 90
22.4, 25.0
9.52 (3/8)
19.05 (3/4)
96
28.0
9.52 (3/8)
22.22 (7/8)
*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
indoor unit
04 07 09 12 14 18 24 30 34 36 45 54 60 72 90 96
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
Protection method
Outdoor
1 month or more
Pinch pipes
Less than 1 month
Pinch or tape pipes
Indoor
—
Pinch or tape pipes
• 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.
5. PIPE
INSTALLATION
5.1. Brazing
CAUTION
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.
Pressure regulating valve
Cap
Nitrogen gas
Brazing area
Apply nitrogen gas while brazing the pipes.
Nitrogen gas pressure: 0.02 MPa (= pressure felt suf-
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
CAUTION
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
A
B
A
B
B
A
GOOD
GOOD
Horizontal
Vertical
Horizontal line
or
± 15°
PROHIBITED
Header
C
H
1
α
1
β
1
D
H
2
α
2
β
2
GOOD
GOOD
Horizontal line
Horizontal line
View
D
View
C
Horizontal line
Vertical line
Gas pipe
Liquid pipe
Outdoor
unit side
Outdoor
unit side
H
1
= 0 to 10 mm
H
2
= 0 to 10 mm
(
α
1
: 0° to 1°)
β
1
: -10° to 10°
(
α
2
: 0° to 1°)
β
2
: -10° to 10°
PROHIBITED
CAUTION
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.
To indoor unit
To indoor unit
To indoor unit
Main pipe
Main pipe
0.5 m or more
0.5 m or more
To indoor unit
Separation tube
Header
To indoor unit
0.5 m or more
0.5 m or more
To indoor unit
Separation tube
Header
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9380545248-02_IM.indb 6
2018/1/24 9:36:31
2018/1/24 9:36:31
