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A (between outdoor unit and outdoor unit branch kit)
Allowable pipe
Between primary out door unit and
length (actual pipe
the farthest indoor unit
length)
Between outdoor unit and indoor
unit (When outdoor unit is installed
* (+e): applies to mul-
below)
tiple outdoor units
* Only when the size of the liquid
connections.
pipe goes down.
Table. A2
Outdoor unit
HP
cooling capacity
Liquid pipe
(kW)
8
22.4
12.70 (1/2") → 9.52(3/8")
10
28.0
12.70 (1/2") → 9.52 (3/8")
12
33.5
12.70 (1/2")
14
40.0
12.70 (1/2")
16
45.0
12.70 (1/2")
18
50.0
15.88 (5/8")
B (between outdoor unit branch kits or outdoor unit branch kit and
first separation tube)
Allowable pipe
Between primary out door unit and
length (actual pipe
the farthest indoor unit
length)
Between outdoor unit and indoor
unit (When outdoor unit is installed
* (+e): applies to mul-
below)
tiple outdoor units
* Only when the size of the liquid
connections.
pipe goes down.
Table. B2
Total cooling capacity
of outdoor unit (kW)
Liquid pipe
22.4
12.70 (1/2") → 9.52 (3/8")
22.5 to 28.0
12.70 (1/2") → 9.52 (3/8")
28.1 to 45.0
12.70 (1/2")
45.1 to 56.0
15.88 (5/8")
56.1 to 62.4
15.88 (5/8")
62.5 to 80.0
15.88 (5/8")
80.1 to 96.0
19.05 (3/4")
96.1 or more
19.05 (3/4")
C (between separation tubes)
Allowable pipe
Between primary out door unit and
length (actual pipe
the farthest indoor unit
length)
Between the first separation tube
and the farthest indoor unit
* (+e): applies to mul-
tiple outdoor units
Between outdoor unit and indoor
connections.
unit (When outdoor unit is installed
below)
* Only when the size of the liquid
pipe goes down.
Table. C2
Total cooling capacity
of indoor unit (kW)
Liquid pipe
2.2 to 11.1
9.52 (3/8")
11.2 to 13.9
9.52 (3/8")
14.0 to 19.6
12.7 (1/2")
19.7 to 22.3
12.7 (1/2")
22.4 to 28.0
12.7 (1/2")
28.1 to 32.4
12.7 (1/2")
32.5 to 44.7
12.7 (1/2")
44.8 to 47.0
15.88 (5/8") → 12.7 (1/2")
47.1 to 56.0
15.88 (5/8")
56.1 to 71.6
15.88 (5/8")
71.7 to 80.0
15.88 (5/8")
80.1 to 95.0
19.05 (3/4")
95.1 to 103.0
19.05 (3/4")
103.1 or more
19.05 (3/4")
(If pipe diameter C2 > B2, select pipe size from table B2.)
a (+e)+f,
70 m or less
a (+e)+p
5 m or less
H
Outside diameter (mm)
Gas pipe
22.22 (7/8") → 19.05 (3/4")
22.22 (7/8")
28.58 (1-1/8")
28.58 (1-1/8")
28.58 (1-1/8")
28.58 (1-1/8")
a (+e)+f,
70 m or less
a (+e)+p
5 m or less
H
Outside diameter (mm)
Gas pipe
22.22 (7/8") → 19.05 (3/4")
22.22 (7/8")
28.58 (1-1/8")
28.58 (1-1/8")
34.92 (1-3/8") → 28.58 (1-1/8")
34.92 (1-3/8")
34.92 (1-3/8")
41.27 (1-5/8")
a (+e)+f,
120 m or less
a (+e)+p
60 m or less
f, p
5 m or less
H
Outside diameter (mm)
Gas pipe
15.88 (5/8")
19.05 (3/4") → 15.88 (5/8")
19.05 (3/4")
22.22 (7/8") → 19.05 (3/4")
22.22 (7/8")
28.58 (1-1/8") → 22.22 (7/8")
28.58 (1-1/8")
28.58 (1-1/8")
28.58 (1-1/8")
34.92 (1-3/8") → 28.58 (1-1/8")
34.92 (1-3/8")
34.92 (1-3/8")
41.27 (1-5/8") → 34.92 (1-3/8")
41.27 (1-5/8")
D (between separation tubes to indoor unit)
Allowable pipe
Between primary out door unit and
length (actual pipe
the farthest indoor unit
length)
Between the first separation tube
and the farthest indoor unit
* (+e): applies to mul-
tiple outdoor units
Between separation tube and
connections.
indoor unit (1.1~2.8 kW only)
Between outdoor unit and indoor
unit (When outdoor unit is installed
below)
* Only when the size of the liquid
pipe goes down.
Table. D2
Cooling capacity
Model code
of indoor unit (kW)
04, 07, 09
1.1, 2.2, 2.8
12, 14
3.6, 4.5
18
5.6
24, 30, 34
7.1, 9.0, 10.0
36, 45, 54
11.2, 12.5, 14.0
60
18.0
72
22.4
90, 96
25.0, 28.0
* 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
1 month or more
Outdoor
Less than 1 month
Indoor
—
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.
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 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.
Separation tube
A
:
Outdoor unit or Refrigerant
branch kit
A
B
:
Indoor unit or Refrigerant
± 15°
branch kit
PROHIBITED
120 m or less
60 m or less
g, h, i, j, k,
20 m or less
5 m or less
Outside diameter mm (in)
Liquid pipe
Gas pipe
6.35 (1/4")
12.70 (1/2") → 9.52 (3/8")
6.35 (1/4")
12.70 (1/2")
9.52 (3/8") → 6.35 (1/4")
15.88 (5/8") → 12.7 (1/2")
9.52 (3/8")
15.88 (5/8")
9.52 (3/8")
19.05 (3/4") → 15.88 (5/8")
9.52 (3/8")
19.05 (3/4")
12.7 (1/2") → 9.52 (3/8")
22.22 (7/8") → 19.05 (3/4")
12.7 (1/2") → 9.52 (3/8")
22.22 (7/8")
Protection method
Pinch pipes
Pinch or tape pipes
Pinch or tape pipes
CAUTION
Pressure regulating valve
Cap
Nitrogen gas
Brazing area
CAUTION
Horizontal
Vertical
A
B
B
or
Horizontal line
B
GOOD
GOOD
a (+e)+f,
a (+e)+p
f, p
l, m, n, o
H
A
En-8
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