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skrameRezis epip fo noitceleStrap esUeltiT.oN
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Indoor unit
connecting pipe
Terminal
branching section
Indoor unit
Multi port type
or Single port
type (Long piping
model) FS unit
Indoor unit
Capacity rank
Equivalent to
HP
Length of piping Gas side Liquid side
005 to 012 0.6 to 1.25
15 m or less real length Ø9.5 Ø6.4
Exceeds 15 m real length Ø12.7 Ø9.5
015 to 018 1.7 to 2.0
15 m or less real length Ø12.7 Ø6.4
Exceeds 15 m real length Ø15.9 Ø9.5
024 to 056 2.5 to 6.0 - Ø15.9 Ø9.5
072 to 096 8.0 to 10.0 - Ø22.2 Ø12.7
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Y-shaped
branching joint
*3, *4
Branching section
Total capacity code of indoor units
Model name
Equivalent to capacity Equivalent to HP
Below 18.0 Below 6.4 RBM-BY55FE
18.0 to below 45.0 6.4 to below 16.1 RBM-BY105FE
45.0 to below 70.5 16.1 to below 25.2 RBM-BY205FE
70.5 or more 25.2 or more RBM-BY305FE
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Branching
header
*3, *4, *5
Branching section
eman ledoMstinu roodni fo edoc yticapac latoT
Equivalent to
capacity
Equivalent to HP For 3 piping For 2 piping
For 4 branches
Below 40.0 Below 14.2 RBM-HY1043FE RBM-HY1043E
40.0 to below 70.5 14.2 to below 25.2 RBM-HY2043FE RBM-HY2043E
For 8 branches
Below 40.0 Below 14.2 RBM-HY1083FE RBM-HY1083E
40.0 to below 70.5 14.2 to below 25.2 RBM-HY2083FE RBM-HY2083E
(9)
Outdoor unit
connection
piping kit
*6, *7
Branching section
Total capacity codes of outdoor units at the downstream side
Model name
Equivalent to capacity Equivalent to HP
Below 73.0 Below 26.0 RBM-BT14FE
73.0 or more 26.0 or more RBM-BT24FE
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Flow Selector
unit
*7
Flow Selector unit
Indoor unit
Single port type*8 / Single port type (Long piping model) *9
Total capacity codes of connected indoor units
Model name
Equivalent to capacity Equivalent to HP
Below 11.2 Below 4.0
RBM-Y1123FE@ / RBM-Y1124FE*
11.2 to below 18.0 4.0 to below 6.4
RBM-Y1803FE@ / RBM-Y1804FE*
18.0 to 28.0 or less 6.4 to below 10.0
RBM-Y2803FE@ / RBM-Y2804FE*
Multi port type *9, *10
Equivalent to capacity Equivalent to HP
No. of
branch
Model name
Below 18.0 Below 6.4
4 RBM-Y1801F4PE*
6 RBM-Y1801F6PE*
*1: Use the same size as the main pipe if it is larger than the main pipe.
*2: Use a suction gas pipe and a liquid pipe for the two pipes branching downstream from the flow selector unit and the dedicated cooling circuit.
*3: Select the branch pipe of the first branch according to the outdoor capacity code.
*4: Select according to the outdoor unit capacity code if the total of the indoor capacity codes exceeds the outdoor unit capacity code.
*5: It is possible to select up to a maximum capacity code total 16 (6 HP) for each one branch of the branching header.
When using a branch header for the first branch with an outdoor unit capacity code of 33.5 (12 HP equivalent) or more and 73.5
(26 HP equivalent) or less, use RBM-HY2043FE (4 branches) and RBM-HY2083FE (8 branches) regardless of the total value of the capacity
codes of the downstream indoor units. And, a branch header cannot be used as the first branch if the performance rank is over 73.5
(26 HP equivalent).
*6: The downstream starting point is the main pipe.
*7: If the performance rank is over 120 (42 HP equivalent), “Flow Selector unit” is available for only Multi port type and Single port type
(Long piping model).
*8: The group connection of the multiple indoor units is possible up to maximum 8 units, and it is possible only within one FS unit.
*9: The group connection of the multiple indoor units is possible up to 8 units if one remote controller is used, and it is possible up to 7 units if
two remote controllers are used.
The group connection of the multiple indoor units is possible only within one branch or one FS unit.
*10: In the downstream of the multi type FS unit, the header branch cannot be used.
*11: The height difference between outdoor and indoor units (H1) is 30 m or less (See “Allowable length and allowable height difference of
refrigerant piping”.)
*12: Incorrect selection of pipe size may cause problem in refrigeration cycle.
Selection of pipe size
skrameRezis epip fo noitceleStrap esUeltiT.oN
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Outdoor unit
connecting pipe
Outdoor unit
Outdoor unit
connection
piping kit
Type
Balance pipe
side
Suction gas
side
Discharge
gas side
Liquid side
MMY-MAP0806* Ø9.5 Ø22.2 Ø19.1 Ø12.7
MMY-MAP1006* Ø9.5 Ø22.2 Ø19.1 Ø12.7
MMY-MAP1206* Ø9.5 Ø28.6 Ø19.1 Ø12.7
MMY-MAP1406* Ø9.5 Ø28.6 Ø22.2 Ø15.9
MMY-MAP1606* Ø9.5 Ø28.6 Ø22.2 Ø19.1
MMY-MAP1806* Ø9.5 Ø28.6 Ø22.2 Ø19.1
MMY-MAP2006* Ø9.5 Ø28.6 Ø22.2 Ø19.1
(2)
Between
Outdoor unit
connection
piping
*6
Outdoor unit
connection
piping kit
Outdoor unit
connection
piping kit
Total capacity codes of outdoor units at the
downstream side
Suction
gas side
Discharge
gas side
Liquid side
Equivalent to capacity Equivalent to HP
45.0 to below 61.5 16 to below 22 Ø28.6 Ø22.2 Ø15.9
61.5 to below 73.0 22 to below 26 Ø34.9 Ø28.6 Ø19.1
73.0 to below 101.0 26 to below 36 Ø34.9 Ø28.6 Ø22.2
101.0 or more 36 or more Ø41.3 Ø28.6 Ø22.2
(3)
Main piping
Outdoor unit
connection piping
kit of header unit
First branching
section
Total capacity code of
outdoor units
Suction
gas
side
Discharge
gas side
Extend
1 *12
Extend 2 (Down
sizing main liquid
pipe) *11, *12
Equivalent to
capacity
Equivalent
to HP
Liquid
side
Liquid
side
The longest
main liquid
piping L1
22.4 to
below 28.0
8 to below 10 Ø22.2 Ø19.1 Ø12.7 Ø9.5 40 m
28.0 to
below 33.5
10 to below 12 Ø22.2 Ø19.1 Ø12.7 Ø9.5 25 m
33.5 to
below 38.4
12 to below 14 Ø28.6 Ø19.1 Ø12.7 Ø9.5 15 m
38.4 to
below 45.0
14 to below 16 Ø28.6 Ø22.2 Ø15.9 Ø12.7 50 m
45.0 to
below 50.4
16 to below 18 Ø28.6 Ø22.2 Ø19.1 Ø12.7 40 m
50.4 to
below 61.5
18 to below 22 Ø28.6 Ø22.2 Ø19.1 Ø15.9 50 m
61.5 to
below 73.0
22 to below 26 Ø34.9 Ø28.6 Ø19.1 Ø15.9 50 m
73.0 to
below 100.8
26 to below 36 Ø34.9 Ø28.6 Ø22.2 Ø19.1 50 m
100.8 or more 36 or more Ø41.3 Ø34.9 Ø22.2 Ø19.1 30 m
Pipe size differs
based on the total
capacity codes of
all outdoor units
(See Table 2.)
(4)
Branching pipe
*1, *2, *6
Branching section
Branching section
Branching section
Flow Selector unit
Flow Selector unit
Branching section
Total capacity codes of indoor units
at the downstream side
Suction
gas
side
Discharge
gas side
Liquid
side
Equivalent to
capacity
Equivalent to HP
Below 18 Below 6.4 Ø15.9 Ø12.7 Ø9.5
18 to below 34 6.4 to below 12.2 Ø22.2 Ø19.1 Ø12.7
34 to below 45.5 12.2 to below 16.2 Ø28.6 Ø22.2 Ø15.9
45.5 to below 56.5 16.2 to below 20.2 Ø28.6 Ø22.2 Ø19.1
56.5 to below 70.5 20.2 to below 25.2 Ø34.9 Ø28.6 Ø19.1
70.5 to below 98.5 25.2 to below 35.2 Ø34.9 Ø28.6 Ø22.2
98.5 or more 35.2 or more Ø41.3 Ø34.9 Ø22.2
Pipe size differs
based on the
total capacity
code value of
indoor units at the
downstream side.
(See Table 1 and 2.)
(5)
Indoor unit
connecting pipe
Flow Selector unit
Indoor unit
Capacity rank Equivalent to HP Gas side Liquid side
005 to 012 0.8 to 1.25 Ø9.5 Ø6.4
015 to 018 1.7 to 2.0 Ø12.7 Ø6.4
024 to 056 2.5 to 6.0 Ø15.9 Ø9.5
072 to 096 8.0 to 10.0 Ø22.2 Ø12.7
21-EN 22-EN
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