En-6
4. 2. Pipe selection
CAUTION
This unit is designed speci
fi
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
Table. 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)
Table. 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
04 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)
Table. E (Indoor unit capacity comparison table - The indication of power is dif-
ferent depending on the model.)
Model code of indoor unit
Capacity [kW]
04
1.1
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
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 NOT
connected
1.1 kW cooling capacity indoor unit is connected
9.0 kW or larger cool-
ing capacity AU or AR
is NOT connected
9.0 kW or larger cooling capacity
AU or AR is connected
130%
117%
110%
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 suf
fi
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.
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