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REFRIGERANT PIPING
WARNING
If refrigerant gas has leaked during the installation work, ventilate the room immediately.
If the leaked refrigerant gas comes in contact with fire, noxious gas may be generated.
After the installation work, confirm that refrigerant gas does not leak.
If refrigerant gas leaks into the room and flows near a fire source, such as a fan heater, cooking stove or heating
unit, noxious gas may be generated.
Permissible pipe length and permissible height difference
The length of a connection pipe to the indoor unit should be 15m or less.
For details, refer to the installation manual attached to the outdoor unit.
REQUIREMENT
When the refrigerant pipe is long, set the support brackets to fix the pipe at intervals of 2.5 to 3m.
If the pipe is not foxed, noise may be generated.
Be sure to use the flare nuts attached to the Flow Selector unit or ones for R410A.
Piping material and dimensions
One indoor unit connection
∗ Use pipes attached with the Flow Selector unit.
The accessory pipes are not flared. Flare them before using its.
Multi indoor unit connection
Material
Flow Selector unit
Indoor unit
Indoor unit side pipe size
(mm)
Outdoor unit side pipe size
(mm)
Seamless phosphorus deoxidized copper pipe for air conditioning
RBM- Y1122FE Y1802FE Y2802FE
MM
✽✽
✽✽
✽-AP
✽✽✽✽✽✽
✽✽✽✽✽✽
✽✽✽ 007 to 012 015 to 018 024 to 030 036 to 056 072 to 096
Gas pipe Ø9.5
∗
Ø12.7
∗
Ø15.9 Ø15.9 Ø22.2
∗1
Liquid pipe Ø6.4
∗
Ø6.4
∗
Ø9.5 Ø9.5 Ø12.7
Suction gas pipe Ø15.9 Ø15.9 Ø15.9 Ø15.9 Ø22.2
∗1
Discharge gas pipe Ø12.7 Ø12.7 Ø12.7 Ø12.7 Ø19.1
∗
Liquid pipe Ø9.5 Ø9.5 Ø9.5 Ø9.5 Ø12.7
Material
Flow Selector unit
Indoor unit capacity code
Indoor unit side pipe size
(mm)
Outdoor unit side pipe size
(mm)
Connectable indoor units
Seamless phosphorus deoxidized copper pipe for air conditioning
RBM- Y1122FE Y1802FE Y2802FE
Less than 11.2
11.2 or more 18.0 or more
less than 18.0 less than 22.0
Gas pipe Ø15.9 Ø15.9 Ø22.2
∗1
Liquid pipe Ø9.5 Ø9.5 Ø12.7
Suction gas pipe Ø15.9 Ø15.9 Ø22.2
∗1
Discharge gas pipe Ø12.7 Ø12.7 Ø19.1
∗
Liquid pipe Ø9.5 Ø9.5 Ø12.7
588
∗1 Be sure to use the attached pipes (with flare nut) with the Flow Selector unit.
They are shipped as the accessories because the attached pipes cannot be flare-processed at the local site.
Outdoor unit Follower selector unit
Indoor unit
Outdoor unit Follower selector unit
Indoor unit
For selection of the branching pipe, refer to the
Installation Manual attached to the outdoor unit.
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