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Header branch method
1. When installing 1 outside unit indepen-
dently
Ex) 6 indoor units connected
Ⓐ Outside unit
Ⓑ Header branch
Ⓒ Indoor unit
Ⓓ Seal
Ú Outside unit Ⓐ ~ Header branch
part Ⓑ : Main pipe diameter (A)
Outside unit capacity
Liquid pipe (mm)
8HP
Ø9.52
16 HP
Ø12.7
Ú Total refrigerant pipe length = A +a +b +c +d +e +f ≤ 300 m
Longest pipe length (Equivalent pipe length)
L
A +f ≤ 150 m(175 m)
Longest pipe length after 1st branching
ℓ
f ≤ 40 m
High/Low difference (Outside unit <-> Indoor unit)
H
H ≤ 50 m
High/Low difference (Indoor unit <-> Indoor unit)
h
h ≤ 15 m
• For the pipe length after the header branch (a~f), it is recommended to install the unit so that the difference of the pipe dis-
tance connected to the indoor unit is minimized.
• The large difference in pipe distance can cause performance difference between indoor units.
• After the header branch, you cannot use the Y branch and header branch.
• When the pipe distance corresponding to the farthest indoor unit from the outside unit is 90m or above, you must change the
main pipe diameter according to the outside unit capacity in accordance with the following table.
(This applies to both the liquid and gas pipes.)
Gas Pipe
8 HP. ............................................Ø22.2 ' Ø25.4
16 HP ..........................................Ø28.58 ' Ø31.8
Gas pipe (mm)
Ø22.2
Ø28.58
8 HP.............................................Ø9.52 ' Ø12.7
16 HP...........................................Ø12.7 ' Ø15.88
Refrigerant piping system
L Below 150 m
Below 15 m
Liquid Pipe
Installation Manual 29
Below 40 m
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