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4
REFRIGERANT PIPING
If refrigerant gas has leaked during the installation work, ventilate the room immediately.
If the leaked refrigerant gas comes in contact with fi re, noxious gas may be generated.
After the installation work, confi rm that refrigerant gas does not leak.
If refrigerant gas leaks into the room and fl ows near a fi re source, such as a fan heater, cooking stove or heating
unit, noxious gas may be generated.
Permissible pipe length and permissible height difference
For piping dimensions, follow the Installation Manual attached to the outdoor unit.
REQUIREMENT
When the refrigerant pipe is long, set the support brackets to fi x the pipe at intervals of 2.5 to 3 m.
If the pipe is not fi xed, noise may be generated.
Connection pipe size of Flow Selector unit (default)
Outdoor unit side
(Upstream)
RBM-***
Suction gas
HP/LP gas pipe
pipe
Y1121FUPE
Ø15.9
Ø12.7
Y1801FUPE
Y2801FUPE
Ø22.2
Ø19.1
EN-17
WARNING
Indoor unit side
(Downstream)
Liquid pipe
Gas pipe
Liquid pipe
Ø9.5
Ø15.9
Ø12.7
Ø22.2
HP: high pressure
LP: low pressure
9
Pipe connecting process
• Connect the pipes.
• Use attached-pipe (accessory) to connect the pipe with different diameter from the pipe to Flow Selector unit.
(RBM-Y1121FUPE)
HP: high pressure
LP: low pressure
HP/LP gas pipe
Suction gas pipe
Liquid pipe
(Unit : mm)
* Be sure to wrap the pipe with wet cloth when applying brazing.
Ø9.5
Remove the cap.
Ø12.7
• 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.
CAUTION
Wet cloth
Apply brazing to full circumference.
Insert the connecting pipe.
Gas pipe
Liquid pipe
Attached pipes
(Accessory: Y1121FUPE)
EN-18
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