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Selection of refrigerant piping
Outdoor unit
Liquid pipe
Gas pipe
1st branching
Branching
section
pipe
Main pipe
(4)
(2)
(1)
Branching
pipe
(2)
No.
Piping parts
Name
Connecting pipe size of outdoor unit
Out door unit capacity type
Outdoor unit
(1)
Main pipe
1st branching
section
Pipe size between branching sections
Total capacity codes of indoor
Branching section
Equivalent to HP
(2)
Branching pipe
Branching section
2.4 or more
* When exceed the main pipe size, use the same size as the main
pipe.
Connecting pipe size of indoor unit
Branching section
Indoor unit
(3)
connecting pipe
003 to 012 type
Indoor unit
014 to 018 type
020 to 056 type
57-EN
Branching
header
(5)
(3)
(3)
(3)
(3)
Y-shaped
(4)
branching joint
(3)
(3)
Selection of pipe size (Unit: mm)
Gas pipe
Liquid pipe
0401 type
15.88
9.52
0501 type
15.88
9.52
0601 type
15.88
9.52
units at downstream side
Gas
Liquid
pipe
pipe
Equivalent to
capacity [kW]
Below 2.4
Below 6.6
12.70
9.52
6.6 or more
15.88
9.52
Liquid
Capacity type
Gas pipe
pipe
9.52
6.35
12.70
6.35
15.88
9.52
– 29 –
No.
Piping parts
(4)
Branching section
(5)
Branching section Branching header
(6)
(6)
Shut-off Valve unit Shut-off Valve unit
Indoor
unit
Indoor
unit
Remarks
Same as connecting
pipe size of the
outdoor unit.
Pipe size differs based
on the total capacity
code value of indoor
units at the
downstream side. If
the total value
exceeds the capacity
code of the outdoor
unit, apply the
capacity code of the
outdoor unit. (See
Table 1 and 2.)
Name
Selection of pipe size
Selection of branching section (Y-shaped branching joint)
Y-shaped
Model name
branching joint
Y-shape branching joint
RBM-BY55E
Selection of branching section (Branching header)
For 4 branches
Branching header*1
For 8 branches
* A capacity code of up to a maximum of 6.0 HP is connectable to one line after branching
from the header.
Selection of Shut-off Valve unit
Total capacity code
of indoor units at
downstream side
Model name
Equivalent to
capacity (HP)
Below 4.0
RBM-SV1121HUPE
4.0 or more
RBM-SV1801HUPE
Model name
RBM-HY1043E
RBM-HY1083E
Maximum
Gas
Liquid
number of
pipe
pipe
connectable
indoor units
12.70
9.52
6
15.88
9.52
10
58-EN
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