En-6
4. 2. Pipe selection
CAUTION
This unit is designed specifi cally for use with the R410A refrigerant.
Pipes for R407C or R22 may not be used with this unit.
Do not use existing pipes.
Improper pipe selection will degrade performance.
First separation
tube (optional)
Separation tube
(optional)
Pipe size
(table B)
Pipe size
(table C)
Pipe size
(table D)
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Table. A (Wall thickness and pipe material for each diameter)
Outside Diameter
mm
(in.)
6.35
(1/4)
9.52
(3/8)
12.70
(1/2)
15.88
(5/8)
Wall Thickness
*2
mm
(in.)
0.8
(0.032)
0.8
(0.032)
0.8
(0.032)
1.0
(0.039)
Material
COPPER
*1
JIS H3300 C1220T-O or equivalent
Please select the pipe size in accordance with local rules.
*1. Allowable tensile stress ≥ 33 (N/mm
2
)
*2. Endurance pressure of the pipes 4.2MPa
Tab le. B (Diameter of piping used between outdoor unit and fi rst separation
tubes or headers)
Diameter of piping [mm(in.)]
Liquid pipe Gas pipe
9.52
(3/8)
15.88
(5/8)
Tab le. C (Diameter of piping used between separation tubes)
Outside diameter [mm(in.)]
Separation tube *3 Header *3
Liquid pipe Gas pipe
9.52
(3/8)
15.88
(5/8)
UTP-AX054A
UTR-H0906L
UTR-H0908L
*3. 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)
Model code of
indoor unit
Outside diameter [mm(in.)]
Liquid pipe Gas pipe
07 to 14 6.35 (1/4) 12.70 (1/2)
18 to 34 9.52 (3/8) 15.88 (5/8)
36 to 54 9.52 (3/8) 19.05 (3/4)
Tab le. E (Indoor unit capacity comparison table - The indication of power is dif-
ferent depending on the model.)
Model code of indoor unit Capacity [kW]
07 2.2
09 2.8
12 3.6
14 4.5
18 5.6
24 7.1
30 9.0
34 10.0
36 11.2
45 12.5
54 14.0
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 refrigeration cycle, the
internal pressure in the refrigera-
tion cycle will become abnormally
high and prevent the unit from
exerting its full performance.
Pressure regulating valve
Cap
Fig.
Nitrogen gas
Brazing area
Apply nitrogen gas while brazing the pipes.
Nitrogen gas pressure: 0.02 MPa (= pressure felt suffi ciently on the back of your
hand)
If a pipe is brazed without applying nitrogen gas, it will create an oxidation fi lm.
This can degrade performance or damage the parts in the unit (such as the compres-
sor or valves).
Do not use fl ux to braze pipes. If the fl ux is the chlorine type, it will cause the pipes to
corrode.
In additio
n, if the fl ux contains fl uoride, it will aff ect the refrigerant piping system due to
deterioration of refrigerant oil.
For brazing material, use phosphor copper that does not require fl ux.
9380545149-02_IM_EN.indd 69380545149-02_IM_EN.indd 6 9/7/2021 1:38:53 PM9/7/2021 1:38:53 PM
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