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PROHIBITED
Header
Horizontal line
Gas pipe
C
Outdoor
GOOD
unit side
Horizontal line
Liquid pipe
D
Outdoor
unit side
H
GOOD
PROHIBITED
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.
0.5 m or more
Main pipe
To indoor unit
0.5 m or more
Main pipe
To indoor unit
0.5 m or more
0.5 m or more
5.3. Opening the knockout hole
Be careful not to deform or scratch the panel while opening the knockout holes.
To protect the piping insulation after opening a knockout hole, remove any burrs from
the edge of the hole. It is recommended to apply rust prevention paint to the edge of the
hole.
• Pipes can be connected from 4 directions, front, lateral side, rear side and bottom.
(Fig. A)
• When connecting at the bottom, remove the service panel and piping cover on the front
of the outdoor unit, and open the knockout hole provided at the bottom corner of the
piping outlet.
• It can be installed as shown on "Fig. B" cutting out the 2 slits as indicated on "Fig. C".
(When cutting slits, use a steel saw.)
Fig. A
Service
panel
Horizontal line
β
1
H
= 0 to 10 mm
1
(α
: 0° to 1°)
1
α
C
β
: -10° to 10°
View
1
1
H
1
Vertical line
H
= 0 to 10 mm
2
α
(α
: 0° to 1°)
2
2
β
2
β
: -10° to 10°
2
2
View
D
CAUTION
Separation tube
To indoor unit
Header
To indoor unit
Separation tube
To indoor unit
Header
To indoor unit
CAUTION
Fig. B
Slit
Slit
Front connection
Lateral connection
5.4. Pipe connection
Do not use mineral oil on a flared part. Prevent mineral oil from getting into the system
as this would reduce the lifetime of the units.
While brazing the pipes, be sure to blow dry nitrogen gas through them.
The maximum lengths of this product are shown in the table. If the units are further
apart than this, correct operation cannot be guaranteed.
5.4.1 Flaring
Use special pipe cutter and flare tool exclusive for R410A.
(1) Cut the connection pipe to the necessary length with a pipe cutter.
(2) Hold the pipe downward so that the cuttings will not enter the pipe and remove any
burrs.
(3) Insert the flare nut (always use the flare nut attached to the indoor and outdoor units
respectively) onto the pipe and perform the flare processing with a flare tool. Leakage
of refrigerant may result if other flare nuts are used.
(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from
entering the pipes.
Check if [L] is flared uniformly and
is not cracked or scratched.
L
Dimension A [mm]
Pipe outside diameter
Flare tool for R410A,
[mm (in)]
6.35 (1/4)
9.52 (3/8)
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
When using conventional (R22) flare tools to flare R410A pipes, the dimension A should
be approximately 0.5 mm more than indicated in the table (for flaring with R410A flare
tools) to achieve the specified flaring. Use a thickness gauge to measure the dimension A.
It is recommended that a R410A flaring tool is used.
Pipe outside diameter
Width across
[mm (in)]
fl ats
6.35 (1/4)
9.52 (3/8)
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
Fig. C
Bottom
connection
Bottom connection
Rear connection
CAUTION
B
Die
A
Pipe
0
Dimension B
-0.4
clutch type
9.1
13.2
0 to 0.5
16.6
19.7
24.0
Width across flats of
Flare nut [mm]
17
22
26
29
36
[mm]
En-6
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