EN-18EN-17
9
Pipe connecting process
• Connect the pipes.
• Use stopper-pipe (accessory) to the port to which indoor unit is not connected.
• Use attached-pipe (accessory) to connect the pipe with different diameter from the pipe to Flow Selector unit.
Discharge gas pipe
Suction gas pipe
Liquid pipe
Attached pipe
(Accessory)
Attached pipe
(Accessory)
• Direction of connection of pipe to the outdoor unit can be selected according to the condition of installation place.
In that case, please replace the stopper pipe.
Stopper pipe
In case of piping
to right side
(default)
In case of piping
to left side
Stopper pipe
CAUTION
* Be sure to wrap the pipe with wet cloth when applying brazing.
Wet cloth
Remove the cap.
Insert the connecting pipe.
Apply brazing to full circumference.
• For a brazing work of the refrigerant pipes, be sure to use nitrogen gas in order to prevent oxidation of the
inside of the pipes; otherwise clogging of the refrigerating cycle due to oxidized scale may occur.
* Remove all fl ux after brazing.
Piping dimensions
They vary depending on the outdoor unit. For details, refer to the Installation Manual attached to the outdoor unit.
(3) (3)
(2) (2)
(4)
(4) (2)
(1)
(1)
(2)
Outdoor unit
Outdoor unit
FS unit
Indoor unit
FS unit
downstream
Indoor unit
Single Indoor unit connection
per one port
Multi indoor unit connection
per one port
Outdoor unit side pipe size (1)
Total capacity codes of indoor units
at the downstream side
Pipe size
Suction gas pipe Discharge gas pipe Liquid pipe
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"
Indoor unit side pipe size (2)
Indoor unit capacity type Length of piping Gas side Liquid side
007 to 012
49ft (15m) or less real length Ø3/8" Ø1/4"
Exceeds 49ft (15m) real length Ø1/2" Ø3/8"
015 to 018
49ft (15m) or less real length Ø1/2" Ø1/4"
Exceeds 49ft (15m) real length Ø5/8" Ø3/8"
021 to 054 - Ø5/8" Ø3/8"
Indoor unit side pipe size (3)
Total capacity codes of indoor units
at the downstream side
Pipe size
Gas pipe Liquid pipe
Below 61 Ø5/8" Ø3/8"
Y-shaped branching joint (4)
Total capacity codes of indoor units at
the downstream side
Y-shaped branching joint Model name
Below 61 RBM-BY55UL
01_1118431101-EN.indd 901_1118431101-EN.indd 9 7/12/2559 BE 9:53 AM7/12/2559 BE 9:53 AM
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