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