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4. SYSTEM CONFIGURATION
For detailed information, refer to the Design and Technical Manual.
4.1. System confi guration
Always keep to the limit on the total amount of refrigerant. Exceeding the limit on the
total amount of refrigerant when charging will lead to malfunction.
• Between outdoor unit and the farthest indoor unit
a + f ≤ 50 m, a + p ≤ 50 m
• Between the first separation tube and the farthest indoor unit
f ≤ 40 m, p ≤ 40 m
• Between the nearest indoor unit and the outdoor unit
a + b + h ≥ 5 m, a + c + q ≥ 5 m
• Between outdoor unit and the first separation tube
a ≥ 3 m
• Difference in height between outdoor units and indoor units (H1)
30 m or less: Outdoor unit is higher than indoor unit
30 m or less: Outdoor unit is lower than indoor unit
• Difference in height between indoor units and indoor units (H2, H3)
15 m or less: Outdoor unit is higher than indoor unit
15 m or less: Outdoor unit is lower than indoor unit
• Maximum total equivalent pipe length
a + f + h + j + l + n + p + q + s + u ≤ 80 m
• Total refrigerant amount
6.83 kg
Fig. A
a
f
b
j
h
c
I.U.
p
q
I.U.
I.U.: Indoor unit
4.2. Pipe selection
This unit is designed specifically 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)
Pipe size
(table B)
I.U.:
I.U.
I.U.
Indoor unit
Table. A
(Wall thickness and pipe material for each diameter)
mm
6.35
Outside Diameter
(in)
(1/4)
mm
0.8
Wall Thickness (
*2)
(in)
(0.032)
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: Endurance pressure of the pipes 4.2MPa
Table. B
(Diameter of piping used between outdoor unit and first separation
tubes or headers)
Diameter of piping [mm(in)]
Liquid pipe
9.52 (3/8)
En-5
CAUTION
Outdoor unit
l
n
I.U.
I.U.
I.U.
I.U.
s
u
I.U.
I.U.
H3
I.U.
CAUTION
Separation
tube (optional)
I.U.
I.U.
I.U.
I.U.
9.52
12.70
15.88
(3/8)
(1/2)
(5/8)
0.8
0.8
1.0
(0.032)
(0.032)
(0.039)
2
)
Gas pipe
15.88 (5/8)
Table. C
(Diameter of piping used between separation tubes)
Outside diameter [mm (in)]
Liquid pipe
9.52 (3/8)
*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
04 to 14
18 to 34
36 to 54
Table. E
(Indoor unit capacity comparison table - The indication of power is
different depending on the model.)
Model code of
indoor unit
Capacity [kW]
In the case of ARXD007GLEH: equivalent to model code of indoor unit
4.3. Protection of pipes
Location
Outdoor
H1
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.
H2
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.
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.
Pipe size
This can degrade performance or damage the parts in the unit (such as the compressor
(table C)
or valves).
Pipe size
Do not use flux to braze pipes. If the flux is the chlorine type, it will cause the pipes to
(table D)
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.
19.05
(3/4)
1.2
5.2. Indoor unit pipe connections
(0.047)
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
Separation tube *3
Gas pipe
15.88 (5/8)
UTP-AX054A
Outside diameter [mm(in.)]
Liquid pipe
6.35 (1/4)
9.52 (3/8)
9.52 (3/8)
04/
07/
09/
12/
14/
18/
004
007
009
012
014
018
1.1
2.2
2.8
3.6
4.5
5.6
Model code 007 → Capacity=2.2 kW
Working period
1 month or more
Pinch pipes
Less than 1 month
Pinch or tape pipes
—
Pinch or tape pipes
CAUTION
CAUTION
Horizontal
B
A
Horizontal line
± 15°
GOOD
Header *3
UTR-H0906L
UTR-H0908L
Gas pipe
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
24/
30/
36/
45/
54/
024
030
036
045
054
7.1
9.0
11.2 12.5 14.0
Protection method
Pressure regulating valve
Cap
Nitrogen gas
Brazing area
Vertical
A
B
or
B
A
GOOD
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