En-9
D (between separation tubes to indoor unit)
• Allowable pipe length (actual pipe length)
Between master out door unit and the
farthest indoor unit
120 m or less
a (+e)+f,
a (+e)+p
Between the
fi
rst separation tube and the
farthest indoor unit
60 m or less
f, p
Between separation tube and indoor unit
(1.1~2.8kW 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
* (+e): applies to multiple outdoor units connections.
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
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 different type of refrigerant enters
the refrigeration cycle, the internal pres-
sure in the refrigeration cycle will become
abnormally high and prevent the unit from
exerting its full performance.
Fig.
Pressure regulating valve
Brazing area
Nitrogen gas
Cap
Apply nitrogen gas while brazing the
pipes.
Nitrogen gas pressure: 0.02 MPa (= suf-
fi
cient pressure to be felt on the back of
your hand or more)
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 com-
pressor 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.
5. 2. Indoor unit pipe connections
CAUTION
For details, refer to the Installation Instruction Sheet of each part.
Separation tube
A
B
A
B
B
A
GOOD
Horizontal
Vertical
Horizontal line
or
± 15°
A : Outdoor unit or Refrigerant branch kit
B : Indoor unit or Refrigerant branch kit
PROHIBITED
Header
C
H
1
α
1
β
1
D
H
2
α
2
β
2
GOOD
Horizontal line
Horizontal line
VIEW D
VIEW C
Horizontal
line
Vertical line
Gas pipe
Liquid pipe
Outdoor
unit side
Outdoor
unit side
H
1
= 0 to 10 mm
H
2
= 0 to 10 mm
(
α
1: 0° to 1°)
β
1: -10° to 10°
(
α
2: 0° to 1°)
β
2: -10° to 10°
PROHIBITED
PROHIBITED
CAUTION
Do not connect a separation tube after a header.
Leave the distance 0.5 m or more for straight part to branch tube and
header.
Main pipe
0.5 m or more
To indoor unit
To indoor unit
To indoor unit
Main pipe
0.5 m or more
To indoor
unit
Separation tube
or
Header
0.5 m or more
0.5 m or more
To indoor unit
or
Header
Separation tube
To indoor
unit
5. 3. Piping method
5. 3. 1. Opening the knockout hole
CAUTION
Be careful to prevent panel deformation or damaged while opening the knockout
hole.
To prevent cutting of the wiring after the knockout hole was opened, remove the
burrs along the edge.
In addition, to prevent rusting, painting the edge with rust preventive paint is recom-
mended.
The piping can be connected from 2 directions; the front or the bottom.
(Knockout holes are provided so that the piping can be connected from 2 different
directions.)
Use the front knockout hole, as required.
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