Installation Instructions

12
Selection of refrigerant piping
No. Piping parts Name Selection of pipe size
Size of main pipe
Outdoor unit capacity type Gas pipe Liquid pipe
0401 type 15.9 9.5
0501 type 15.9 9.5
0601 type 19.1 9.5

Outdoor unit
↓
1st branching section
Main pipe
Pipe size between branching sections
Total capacity codes of indoor units
at down stream side
Equivalent to HP
Gas pipe Liquid pipe
Below 2.8 12.7 9.5
2.8 to below 6.4 15.9 9.5
6.4 to below 7.2 19.1 9.5

Branching section
↓
Branching section
Branching pipe
Note)
If the total capacity code value of indoor units exceeds that of the outdoor units,
apply the capacity code of outdoor units.
Connecting pipe size of indoor unit
Indoor unit capacity type Gas pipe Liquid pipe
007, 009, 012 type 9.5 6.4
015, 018 type 12.7 6.4
024, 030, 036, 048 type 15.9 9.5

Branching section
↓
Indoor unit
Indoor unit
connecting pipe
Selection of branching section
Total capacity codes of indoor
units at down stream side
Equivalent to HP
Model name
Below 6.4 RBM-BY53E
Y-shape branch joint
6.4 or more and up to 7.8 RBM-BY103E
For 4 branches Up to 7.8 RBM-HY1043E
Branch header
For 8 branches Up to 7.8 RBM-HY1083E

Branching section
Y-shape branch joint
Branch header
Note)
*1 :
*2 :
When using a Y-shape branching joint for the 1st branch, select according to
capacity code of the outdoor unit.
For 1 line after branching header indoor units with a maximum capacity code of
6.0 in total can be connected.
4
4
4
4
Outdoor unit
1
1st branching
section
Main pipe
Gas pipe
Liquid pipe
Indoor unit
Branching
pipe
Y-shape
branch joint
3
3 3 3
2
Branching
pipe
Branch header
2
2
3
3 3