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4. SYSTEM CONFIGURATION
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 ≤ 120 m, a + p ≤ 120 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)
50 m or less: Outdoor unit is higher than indoor unit
40 m or less: Outdoor unit is lower than indoor unit
• Difference in height between indoor units and indoor units
H2 ≤ 15 m, H3 ≤ 15 m
• Maximum total equivalent pipe length
a + f + h + j + l + n + p + q + s + u ≤ 180 m
• Total refrigerant amount ≤ 15.7 kg
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 4.2 MPa
Table. B (Diameter of piping used between outdoor unit and first separation
tubes or headers)
Outdoor
Between outdoor unit
unit cool-
MODEL
and the farthest indoor
ing capac-
ity [kW]
Liquid pipe
AJ*040LBLBH
12.1
9.52 (3/8)
AJ*040LELBH
AJ*045LBLBH
14.0
9.52 (3/8)
AJ*045LELBH
AJ*054LBLBH
15.5
9.52 (3/8)
AJ*054LELBH
*3: Pipe Length: "a + f" or "a + p" of "4.1. System configuration"
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
Diameter of piping [mm (in)]
Between outdoor unit
and the farthest indoor
unit < 90 m (*3)
unit ≥ 90 m (*3)
Gas pipe
Liquid pipe
15.88 (5/8)
9.52 (3/8)
15.88 (5/8)
9.52 (3/8)
19.05 (3/4)
9.52 (3/8)
Table. C (Diameter of piping used between separation tubes)
Total cooling
capacity of indoor
unit [kW]
x < 11.2
11.2 ≤ x
*4: For the installation method, please refer to the installation manuals for indoor unit,
separation tubes or headers.
If pipe diameter Table C > Table B, select pipe size from Table B.
"Total cooling capacity of indoor unit" is the total value for the cooling capacity of indoor
unit connected downstream.
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 30
36 to 54 (*5)
*5: If pipe diameter Table D > Table C , using of pipe size from Table C is preferable.
(Use reducer to change the diameter of connection pipe.)
Table. E (Indoor unit capacity comparison table - The indication of power is
different depending on the model.)
Model code of
indoor unit
Capacity [kW]
H1
In the case of ARXD007GLEH: equivalent to model code of indoor unit
4.3. Protection of pipes
H2
Location
Outdoor
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
Pipe size
If air or another type of refrigerant enters the
(table C)
refrigeration cycle, the internal pressure in
the refrigeration cycle will become abnormally
Pipe size
high and prevent the unit from exerting its full
(table D)
performance.
Apply nitrogen gas while brazing the pipes.
Nitrogen gas pressure: 0.02 MPa (= pressure
19.05
felt sufficiently on the back of your hand)
(3/4)
If a pipe is brazed without applying nitrogen gas, it will create an oxidation film.
1.2
This can degrade performance or damage the parts in the unit (such as the compressor
(0.047)
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
For details, refer to the Installation Instruction Sheet of each part.
Gas pipe
Separation tube
19.05 (3/4)
A
:
Outdoor unit or Refrigerant
19.05 (3/4)
branch kit
19.05 (3/4)
B
:
Indoor unit or Refrigerant
branch kit
Outside diameter [mm(in.)]
Liquid pipe
Gas pipe
9.52 (3/8)
15.88 (5/8)
9.52 (3/8)
19.05 (3/4)
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
Brazing area
CAUTION
Horizontal
B
A
Horizontal line
± 15°
GOOD
Separation
Header (*4)
tube (*4)
UTR-H0906L
UTP-AX054A
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
Vertical
A
B
or
B
A
GOOD
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