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32 Outside Unit
Branch pipe can not be used after header
3. When installing 3 outside units
Ex)
6 Indoor Units connected
Ⓐ : Outside Units
Ⓑ : Header branch
Ⓒ : Indoor Units
Ⓓ : Sealing
Ⓔ : Connection branch pipe between
Outside units:ARCNN30
Ⓕ : Connection branch pipe between
Outside units:ARCNN20
10m or
less
H Below 50m(164ft)
Master
Slave2
Slave1
L150m(492ft)
l 40m(131ft)
Below 2m
Below 2m
(h1)
(h1)
Below 2m(6.6ft)
(h1)
Below 15m(49ft)
Ú
Slave1 outside unit ~ Connecting
branch unit
Ⓔ
: Pipe diameter
between outside units (E)
Ú
Connecting branch pipe
Ⓔ
~ Header branch
part
Ⓑ
: Main pipe diameter (A)
Ú
Slave2 outside unit ~ Connecting
branch pipe
Ⓕ
: Pipe diameter
between outside units (F)
Refrigerant piping system
Outside unit capacity Liquid pipe[mm(inch)] Gas pipe [mm(inch)]
40,48,50,60HP Ø19.05(3/4) Ø41.3(1-5/8)
• For the pipe length after the header branch (a~f), it is recommended to install the unit so that the difference of the pipe distance 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 diame-
ter according to the outside unit capacity in accordance with the following table. (This applies to both the liquid and gas pipes.)
Liquid pipe Gas pipe Low/high pressure
[mm(inch)] [mm(inch)] common pipe
Ø15.88(5/8)/19.05(3/4)
Ø34.9(1-3/8)/41.3(1-5/8)
Ø19.05(3/4)
Ú
Total refrigerant pipe length = A + B + C + D + a + b + c + d + e ≤
300m(984ft)(500m(1640ft)*)
Longest pipe length (Equivalent pipe length)
A +f ≤ 150m(492ft)( 175m(574ft))
Longest pipe length after 1st branching
f ≤ 40m(131ft)
High/Low difference (Outside unit ÷ Indoor unit)
H ≤ 50m(164ft)
High/Low difference (Indoor unit ÷ Indoor unit)
h ≤ 15m(49ft)
High/Low difference (Outside unit ÷ Outside unit)
h1 ≤ 2m(6.6ft)
L
ℓ
H
h
h1
Gas Pipe Liquid Pipe
40,48,50,60HP ............................................Ø41.3(1-5/8) 40,48,50,60HP ............................................Ø19.05(3/4) ’ Ø22.2(7/8)
Liquid pipe Gas pipe
Low/high pressure
[mm(inch)]
[mm(inch)]
common pipe
Ø9.52(3/8)/12.7(1/2)
Ø22.2(7/8)/28.58(1-1/8)
Ø19.05(3/4)
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