To Outdoor Unit
Capped Piping
A
A
B
A
B
ARBL054 ARBL057
ARBL104 ARBL107 ARBL1010
Y branch
Header
Less than 3.8kW(13,000 Btu/h)
~8.2kW(28,000 Btu/h)
~17.6kW(60,000 Btu/h)
17.6kW(60,000 Btu/h) or more
ARBL052S
ARBL052L
ARBL102S
ARBL102L
4 branch 7 branch 10 branch
-
The method of connection consists of flare connections at the indoor units, brazing connections for the piping of
the outdoor unit. Note that the branched sections are brazed.
WARNING
Always use extreme care to prevent the refrigerant gas (R407C) from the leakage while using fire or
flame. If the refrigerant gas comes in contact with the flame from any source, such as a gas stove, it
breaks down and generates a poisonous gas which can cause gas poisoning. Never weld in an
unventilated room. Always conduct an inspection for gas leakage after installation of the refrigerant
piping has been completed.
1. Use the following materials for refrigeration piping.
• Material: Seamless phosphorous deoxidized copper pipe
2. Commercially available piping often contains dust and other materials. Always blow it clean with a
dry inert gas.
3. Use care to prevent dust, water or other contaminants from entering the piping during installation.
4. Reduce the number of bending portions as much as possible, and make bending radius as big as
possible.
5. Always use the branch piping set shown below, which are sold separately.
6. If the diameters of the branch piping of the designated refrigerant piping differs, use a pipe cutter to cut
the connecting section and then use an adapter for connecting different diameters to connect the piping.
7. Always observe the restrictions on the refrigerant piping (such as rated length, the difference between
high/low pressures, and piping diameter).
Failure to do so can result in equipment failure or a decline in heating/cooling performance.
8. A second branch cannot be made after a header. (These are shown by X.)
Areas of caution
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