En-8
A (between outdoor unit and outdoor unit branch kit)
Allowable pipe
length (actual pipe
length)
* (+e): applies to mul-
tiple outdoor units
connections.
Between primary out door unit and
the farthest indoor unit
70 m or less
a (+e)+f,
a (+e)+p
Between outdoor unit and indoor
unit (When outdoor unit is installed
below)
* Only when the size of the liquid
pipe goes down.
5 m or less H
Table. A2
HP
Outdoor unit
cooling capacity
(kW)
Outside diameter (mm)
Liquid pipe Gas pipe
8 22.4 12.70 (1/2") → 9.52(3/8") 22.22 (7/8") → 19.05 (3/4")
10 28.0 12.70 (1/2") → 9.52 (3/8") 22.22 (7/8")
12 33.5 12.70 (1/2") 28.58 (1-1/8")
14 40.0 12.70 (1/2") 28.58 (1-1/8")
16 45.0 12.70 (1/2") 28.58 (1-1/8")
18 50.0 15.88 (5/8") 28.58 (1-1/8")
B (between outdoor unit branch kits or outdoor unit branch kit and
first separation tube)
Allowable pipe
length (actual pipe
length)
* (+e): applies to mul-
tiple outdoor units
connections.
Between primary out door unit and
the farthest indoor unit
70 m or less
a (+e)+f,
a (+e)+p
Between outdoor unit and indoor
unit (When outdoor unit is installed
below)
* Only when the size of the liquid
pipe goes down.
5 m or less H
Table. B2
Total cooling capacity
of outdoor unit (kW)
Outside diameter (mm)
Liquid pipe Gas pipe
22.4 12.70 (1/2") → 9.52 (3/8") 22.22 (7/8") → 19.05 (3/4")
22.5 to 28.0 12.70 (1/2") → 9.52 (3/8") 22.22 (7/8")
28.1 to 45.0 12.70 (1/2") 28.58 (1-1/8")
45.1 to 56.0 15.88 (5/8") 28.58 (1-1/8")
56.1 to 62.4 15.88 (5/8")
34.92 (1-3/8") → 28.58 (1-1/8")
62.5 to 80.0 15.88 (5/8") 34.92 (1-3/8")
80.1 to 96.0 19.05 (3/4") 34.92 (1-3/8")
96.1 or more 19.05 (3/4") 41.27 (1-5/8")
C (between separation tubes)
Allowable pipe
length (actual pipe
length)
* (+e): applies to mul-
tiple outdoor units
connections.
Between primary out door unit and
the farthest indoor unit
120 m or less
a (+e)+f,
a (+e)+p
Between the first separation tube
and the farthest indoor unit
60 m or less f, p
Between outdoor unit and indoor
unit (When outdoor unit is installed
below)
* Only when the size of the liquid
pipe goes down.
5 m or less H
Table. C2
Total cooling capacity
of indoor unit (kW)
Outside diameter (mm)
Liquid pipe Gas pipe
2.2 to 11.1 9.52 (3/8") 15.88 (5/8")
11.2 to 13.9 9.52 (3/8") 19.05 (3/4") → 15.88 (5/8")
14.0 to 19.6 12.7 (1/2") 19.05 (3/4")
19.7 to 22.3 12.7 (1/2") 22.22 (7/8") → 19.05 (3/4")
22.4 to 28.0 12.7 (1/2") 22.22 (7/8")
28.1 to 32.4 12.7 (1/2")
28.58 (1-1/8") → 22.22 (7/8")
32.5 to 44.7 12.7 (1/2") 28.58 (1-1/8")
44.8 to 47.0 15.88 (5/8") → 12.7 (1/2") 28.58 (1-1/8")
47.1 to 56.0 15.88 (5/8") 28.58 (1-1/8")
56.1 to 71.6 15.88 (5/8")
34.92 (1-3/8") → 28.58 (1-1/8")
71.7 to 80.0 15.88 (5/8") 34.92 (1-3/8")
80.1 to 95.0 19.05 (3/4") 34.92 (1-3/8")
95.1 to 103.0 19.05 (3/4")
41.27 (1-5/8") → 34.92 (1-3/8")
103.1 or more 19.05 (3/4") 41.27 (1-5/8")
(If pipe diameter C2 > B2, select pipe size from table B2.)
D (between separation tubes to indoor unit)
Allowable pipe
length (actual pipe
length)
* (+e): applies to mul-
tiple outdoor units
connections.
Between primary out door unit and
the farthest indoor unit
120 m or less
a (+e)+f,
a (+e)+p
Between the first separation tube
and the farthest indoor unit
60 m or less f, p
Between separation tube and
indoor unit (1.1~2.8 kW only)
20 m or less
g, h, i, j, k,
l, m, n, o
Between outdoor unit and indoor
unit (When outdoor unit is installed
below)
* Only when the size of the liquid
pipe goes down.
5 m or less H
Table. D2
Model code
Cooling capacity
of indoor unit (kW)
Outside diameter mm (in)
Liquid pipe Gas pipe
04, 07, 09 1.1, 2.2, 2.8 6.35 (1/4")
12.70 (1/2") → 9.52 (3/8")
12, 14 3.6, 4.5 6.35 (1/4") 12.70 (1/2")
18 5.6
9.52 (3/8") → 6.35 (1/4")
15.88 (5/8") → 12.7 (1/2")
24, 30, 34 7.1, 9.0, 10.0 9.52 (3/8") 15.88 (5/8")
36, 45, 54 11.2, 12.5, 14.0 9.52 (3/8")
19.05 (3/4") → 15.88 (5/8")
60 18.0 9.52 (3/8") 19.05 (3/4")
72 22.4
12.7 (1/2") → 9.52 (3/8")
22.22 (7/8") → 19.05 (3/4")
90, 96 25.0, 28.0
12.7 (1/2") → 9.52 (3/8")
22.22 (7/8")
* Downsizing of pipes other than mentioned above by "→" is not allowed.
4.4. Protection of 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.
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
5. PIPE INSTALLATION
5.1. Brazing
CAUTION
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.
Pressure regulating valve
Cap
Nitrogen gas
Brazing area
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.
This can degrade performance or damage the parts in the unit (such as the compressor
or valves).
Do not use flux to braze pipes. If the flux is the chlorine type, it will cause the pipes to
corrode.
In additio
n, 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
CAUTION
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
A
B
A
B
B
A
± 15°
GOOD GOOD
Horizontal
Vertical
Horizontal line
or
PROHIBITED
9378945708-02_IM_L9.indb 89378945708-02_IM_L9.indb 8 2022/1/20 15:34:372022/1/20 15:34:37
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