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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)
Indoor
Indoor
Indoor
Indoor
unit
unit
unit
unit
Table. A (Wall thickness and pipe material for each diameter)
mm
6.35
Outside Diameter
(in.)
(1/4)
mm
0.8
*2
Wall Thickness
(in.)
(0.032)
Material
Please select the pipe size in accordance with local rules.
*1. Allowable tensile stress ≥ 33 (N/mm
*2. Endurance pressure of the pipes 4.2MPa
Table. B
(Diameter of piping used between outdoor unit and fi rst separation
tubes or headers)
Diameter of piping [mm(in.)]
Liquid pipe
9.52
(3/8)
Table. C
(Diameter of piping used between separation tubes)
Outside diameter [mm(in.)]
Liquid pipe
Gas pipe
9.52
15.88
(3/8)
(5/8)
*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
Liquid pipe
04 to 14
6.35 (1/4)
18 to 30
9.52 (3/8)
36 to 54
9.52 (3/8)
Pipe size
(table B)
Separation tube
(optional)
Pipe size
(table C)
Pipe size
(table D)
Indoor
Indoor
unit
unit
9.52
12.70
15.88
(3/8)
(1/2)
(5/8)
0.8
0.8
1.0
(0.032)
(0.032)
(0.039)
*1
COPPER
JIS H3300 C1220T-O or equivalent
2
)
Gas pipe
15.88
(5/8)
Separation tube *3
Header *3
UTR-H0906L
UTP-AX054A
UTR-H0908L
Outside diameter [mm(in.)]
Gas pipe
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
Table. E (Indoor unit capacity comparison table - The indication of power is dif-
ferent depending on the model.)
Model code of indoor unit
04
07
09
12
14
18
24
30
36
45
54
In the case of ARXD07GALH: equivalent to model code of indoor unit
Model code 07 → Capacity = 2.2kW
If indoor unit whose cooling capacity is 1.1 kW is connected, calculate the value according
to the following restrictions.
Maximum cooling capacity of connectable indoor unit
1.1 kW cooling capacity indoor unit is connected
1.1 kW cooling capacity
9.0 kW or larger cool-
indoor unit is NOT
ing capacity AU or AR
connected
is NOT connected
130%
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.
5. PIPE INSTALLATION
5. 1.
Brazing
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.
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 addition, if the fl ux contains fl uoride, it will affect the refrigerant piping system due to
deterioration of refrigerant oil.
For brazing material, use phosphor copper that does not require fl ux.
Capacity [kW]
1.1
2.2
2.8
3.6
4.5
5.6
7.1
9.0
11.2
12.5
14.0
9.0 kW or larger cooling capacity
AU or AR is connected
117%
110%
Protection method
Pinch pipes
Pinch or tape pipes
—
Pinch or tape pipes
CAUTION
Pressure regulating valve
Fig.
Cap
Nitrogen gas
Brazing area
En-6
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