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• If the piping length between the outdoor units exceeds 6.5 ft. (2 m),
create a rise of 8 in. (200 mm) or more in the suction gas and high/
low pressure gas line within a length of 6.5 ft. (2 m) from the kit.
If ≤ 6.5 ft. (2 m)
1
If > 6.5 ft. (2 m)
1
1
To indoor units
2
Piping between outdoor units
a
≤ 6.5 ft. (2 m)
b
≥ 8 in. (200 mm)
c
> 6.5 ft. (2 m)
NOTE
There are restrictions on the refrigerant pipe connection order between
outdoor units during installation in case of a multiple outdoor unit system.
Install according to following restrictions. The capacities of outdoor units
A and B must fulfill the following restriction conditions: A≥B.
1 To indoor units
A
B
2 Outdoor unit multi connection
1 2
8.2.6. Branching the refrigerant piping
1 For installation of the refrigerant branch kit, refer to the installation
manual delivered with the kit.
+30°
1
A
-30°
Vertical
1
B
1 Horizontal surface
• Mount the REFNET joint so that it branches either horizontally or vertically.
• If mounted horizontally, do not tilt the joint more than 30° above or
below the horizontal plane.
• Mount the REFNET header so that it branches horizontally.
17
2
a
c
2
a
b
piping kit (first branch)
Horizontal
2 Installation of the multi connection piping kit.
+15°
A
-15°
1
B
1
C > 4-3/4 in. (120 mm)
D > 19-11/16 in. (500 mm)
• Install the joints horizontally, so that the caution label (1) attached to
the joint comes to the top.
- Do not tilt the joint more than 15° above or below the horizontal
plane (see view A).
- Do not install the joint vertically (see view B).
• Make sure that the total length of the piping connected to the joint
is absolute straight for more than 19-11/16 in. (500 mm). Only if a
straight field piping of more than 4-3/4 in. (120 mm) is connected,
more than 19-11/16 in. (500 mm) of straight section can be ensured.
• Improper installation may lead to malfunction of the outdoor unit.
8.3. Guidelines for handling stop valve
8.3.1. Cautions on handling the stop valve
• Make sure to keep all stop valves open during operation.
• The figure below shows the name of each part required in handling
the stop valve.
• The stop valves are factory closed.
• When handle the stop valves, be careful not to damage the port
pipes around (refer to P22).
1
2
3
4
1
2
5
4
3
1 Service port and service port
cover
2 Stop valve
3 Field piping connection
4 Stop valve cover
1 Service port
2 Cap
3 Hexagon hole
4 Shaft
5 Seal
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