Selection Of Refrigerant Piping - Toshiba MCY-MHP0404HT-E Engineering Data Book

3
Refrigerant piping design

3-3. Selection of refrigerant piping

Gas pipe
Main pipe
No. Piping parts Name
Outdoor unit
(1) Main pipe
1st branching
section
Branching section
(2) Branching pipe
Branching section
Branching section
Indoor unit
(3)
connecting pipe
Indoor unit
Y-shaped
(4) Branching section
branching joint
Branching
(5) Branching section
header
Outdoor unit
Liquid pipe
1st branching Branching
section pipe
(4)
(2)
(1)
Branching
pipe
(2)
Size of main pipe
Outdoor unit capacity type
0404 type
0504 type
0604 type
Pipe size between branching sections
Total capacity codes of indoor units at down
stream side
Equivalent to HP
Below 2.4
2.4 to below 6.4
6.4 or more
Connecting pipe size of indoor unit
Capacity rank
005 to 012 type
014 to 018 type
020 to 056 type
Selection of branching section (Y-shaped branching joint)
Y-shape branch joint
Selection of branching section (Branching header)
Branching header
Branching
header
(5)
(3)
(3)
(3)
Y-shaped
branching joint
(4)
(3)
Selection of pipe size
Gas pipe
Gas pipe
Equivalent to capacity
Below 6.6
6.6 to below 18.0
18.0 or more
Gas pipe
Model name
RBM-BY55E
For 4 branches
For 8 branches
18
(3)
Indoor
unit
(3)
Indoor
unit
Liquid pipe
Same as connecting pipe
15.88 9.52
size of the outdoor unit.
15.88 9.52
19.05 9.52
Pipe size differs based on the
total capacity code value of
indoor units at the
Liquid pipe
downstream side. If the total
value exceeds the capacity
12.70 9.52
code of the outdoor unit,
15.88 9.52
apply the capacity code of the
outdoor unit.
19.05 9.52
Liquid pipe
9.52 6.35
12.70 6.35
15.88 9.52
Model name
RBM-HY1043E
RBM-HY1083E
Remarks