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No.
Piping parts
Branching
section
(4)
Branching pipe
Branching
section
Branching
section
(5)
Indoor unit
Branching
(6)
section
branching joint
Name
Pipe size between branching sections
Total capacity codes of indoor units at
Equivalent to
capacity (HP)
Below 2.4
2.4 to below 6.4
6.4 to below 12.2
12.2 to below 20.2
20.2 to below 22.4
22.4 to below 25.2
25.2 to below 35.2
35.2 to below 61.2
61.2 to below 75.2
75.2 or more
*1 If the liquid side piping size of main piping is increased
to Dia. 25.4 ( one size up), the liquid side piping size
also has to change to Dia. 25.4.
Connecting pipe size of indoor unit
003 to 012 type
Indoor unit
connecting
0
1
4
o t
0
1
pipe
0
2
0
o t
0
5
0
7
2
o t
0
9
1 1
2
y t
p
e
1
2
8
y t
p
e
Selection of branching section (Y-shaped branching joint)
Y-shaped
Y-shape
branching joint
Selection of pipe size
downstream side
Gas side
12.7
15.9
22.2
28.6
28.6
34.9
34.9
41.3
44.5
54.0
Capacity rank
15 m or less real length
Real length exceeds 15 m
8
y t
p
e
6
y t
p
e
6
y t
p
e
Total capacity code of
Equivalent to capacity
Below 6.4
6.4 to below 14.2
14.2 to below 25.2
25.2 to below 61.2
61.2 or more
5
Liquid side
Pipe size differs
based on the total
9.5
capacity code value
9.5
of indoor units at the
12.7
downstream side.
If the total capacity
15.9
code value of indoor
19.1
units exceeds that
19.1
of the outdoor units,
apply the capacity
19.1
code of the outdoor
22.2
units.
22.2
*1
22.2
Gas side
9.5
12.7
1
1
2
2
2
indoor
Model name
(HP)
RBM-BY55E
RBM-BY105E
RBM-BY205E
RBM-BY305E
RBM-BY405E
Remarks
Liquid
side
6.4
6.4
2
7 .
6
4 .
5
9 .
9
5 .
2
2 .
1
2
7 .
8
6 .
1
2
7 .
8
6 .
1
5
9 .
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Troubleshooting
