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21-EN 22-EN
(1) Outdoor unit connecting pipe
Outdoor unit capacity type (*1) Balance pipe side Suction gas side
Discharge
gas side
Liquid side
072 type, 096 type Ø3/8" Ø7/8" Ø3/4" Ø1/2"
120 type Ø3/8" Ø1-1/8" Ø3/4" Ø1/2"
144 type Ø3/8" Ø1-1/8" Ø7/8" Ø5/8"
168 type Ø3/8" Ø1-1/8" Ø7/8" Ø3/4"
(2) Connecting pipe between outdoor units
Total capacity code of the outdoor
units at downstream side (*1) (*7)
Suction gas side
Discharge
gas side
Liquid side
336 Ø1-3/8" Ø1-1/8" Ø7/8"
360 or more Ø1-5/8" Ø1-1/8" Ø7/8"
(3) Main pipe
Total capacity code of all
outdoor units
Suction gas side
Discharge
gas side
Liquid side
072, 096 Ø7/8" Ø3/4" Ø1/2"
120 Ø1-1/8" Ø3/4" Ø1/2"
144 Ø1-1/8" Ø7/8" Ø5/8"
168, 192 Ø1-1/8" Ø7/8" Ø3/4"
216, 240 Ø1-3/8" Ø1-1/8" Ø3/4"
264, 288, 312, 336 Ø1-3/8" Ø1-1/8" Ø7/8"
360 or more Ø1-5/8" Ø1-3/8" Ø7/8"
(4) Branching pipe
Total capacity code of indoor units
at downstream side (*1) (*2) (*3) (*8)
Suction gas side
Discharge
gas side
Liquid side
Below 61 Ø5/8" Ø1/2" Ø3/8"
61 to below 115.5 Ø7/8" Ø3/4" Ø1/2"
115.5 to below 153.5 Ø1-1/8" Ø7/8" Ø5/8"
153.5 to below 191.5 Ø1-1/8" Ø7/8" Ø3/4"
191.5 to below 239 Ø1-3/8" Ø1-1/8" Ø3/4"
239 to below 334 Ø1-3/8" Ø1-1/8" Ø7/8"
334 or more Ø1-5/8" Ø1-3/8" Ø7/8"
(5) Single port type FS unit and indoor unit connection pipe
Indoor unit capacity code Gas side Liquid side
007 to 012 type Ø3/8" Ø1/4"
015 to 018 type Ø1/2" Ø1/4"
021 to 054 type Ø5/8" Ø3/8"
072 to 096 type Ø7/8" Ø1/2"
(6) Branching, Multi port type FS unit, Single port long piping type FS unit and indoor
unit connection pipe
Indoor unit capacity code Gas side Liquid side
007 to 012 type
Pipe length
(Actual length)
49 ft or less Ø3/8" Ø1/4"
Over 49 ft Ø1/2" Ø3/8"
015 to 018 type
Pipe length
(Actual length)
49 ft or less Ø1/2" Ø1/4"
Over 49 ft Ø5/8" Ø3/8"
021 to 054 type Ø5/8" Ø3/8"
072 to 096 type Ø7/8" Ø1/2"
(7) Y-shaped branching joint (*3) (*4)
Total capacity code of indoor units
on downstream side from
Y-shaped branching joint (*4) (*5)
Model name
For 3 pipe For 2 pipe
Below 61 RBM-BY55FUL RBM-BY55UL
61 to below 134.5 RBM-BY105FUL RBM-BY105UL
134.5 to below 239 RBM-BY205FUL RBM-BY205UL
239 or more RBM-BY305FUL RBM-BY305UL
(8) Branching header
Total capacity code of the indoor units
on downstream side from
branching header (*4) (*5) (*6)
Model name
For 3 pipe For 2 pipe
For 4 branching
Below 134 RBM-HY1043FUL RBM-HY1043UL
134 to below 240 RBM-HY2043FUL RBM-HY2043UL
For 8 branching
Below 134 RBM-HY1083FUL RBM-HY1083UL
134 to below 240 RBM-HY2083FUL RBM-HY2083UL
(9) Outdoor unit connection piping kit
Total capacity code of the outdoor
units at downstream side (*1) (*7)
Model name
Below 247 RBM-BT14FUL
247 or more RBM-BT24FUL
(10) Flow Selector unit (*9)
Single port type (*10) / Single port long piping type (*11)
Total capacity code of outdoor units
on downstream side from FS unit
Model name
Below 38 RBM-Y0383FUL / RBM-Y1124FUL
38 to below 61 RBM-Y0613FUL / RBM-Y1804FUL
61 to 96 or less RBM-Y0963FUL / RBM-Y2804FUL
Multi port type (*11) (*12)
Total capacity code of outdoor units
on downstream side from FS unit
No. of branch Model name
Below 61
4 RBM-Y0611F4PUL
6 RBM-Y0611F6PUL
(*1) : The capacity code of outdoor unit and indoor unit, please refer to “Capacity code of indoor and outdoor units”.
(*2) : If the size of the pipe to be selected is larger than the size of the main pipe, please use the same pipe size as the main pipe.
(*3) : Two pipes in downstream of FS unit and cooling only indoor unit use liquid pipe and suction gas pipe.
(*4) : The first branching joint, select at capacity code of outdoor unit.
(*5) : If the total capacity code of indoor units exceed the capacity code of outdoor unit, select the size from the capacity code of the outdoor unit.
(*6) : For one line pipe line of header branching, total 57 capacity code of indoor units is connectable.
If connecting the branching header to the first branch section with the capacity code of outdoor unit is more than 114 (kBtu/h) and less than
247 (kBtu/h), use the RBM-2043FUL (4 branch), and RBM-HT2083FUL (8 branch).
Also, the branching header cannot be used for the first branch section when the capacity code of outdoor unit is more than 247 (kBtu/h).
(*7) : The main pipe is the starting point. The follower unit side is the downstream side.
(*8) : Selection piping is the starting point. The indoor unit side is the downstream side.
(*9) : If the code of outdoor unit is over 408, “Flow Selector unit” is available for only Multi port type and Single port long piping type.
(*10): The group connection of the multiple indoor units is possible up to maximum 8 units, and it is possible only within one FS unit.
(*11): 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.
(*12): In the downstream of the multi type FS unit,the header branch cannot be used.
1122001001-2_EN-FR.indb 111122001001-2_EN-FR.indb 11 2/18/17 11:44 AM2/18/17 11:44 AM
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