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Refrigerant piping system
3. When installing 3 outside units
Ex) 5 Indoor Units connected
Ⓐ : Outside Units
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units
Ⓓ : Downward Indoor Unit
Ⓔ : Connection branch pipe between
Outside units:ARCNN30
Ⓕ : Connection branch pipe between
Outside units:ARCNN20
Ú Slave2 outside unit ~ Connecting
branch pipe Ⓕ: Pipe diameter
between outside units (F)
Liquid pipe (mm) Gas pipe (mm)
Ø9.52/12.7
Ø22.2/28.58
Ú Slave1 outside unit ~ Connecting
branch pipe Ⓔ: Pipe diameter
between outside units (E)
Liquid pipe (mm) Gas pipe (mm)
Ø15.88/19.05
Ø34.9/41.3
Ú Total refrigerant pipe length =
A + B + C + D + a + b + c + d + e ≤ 300m (500m**)
Longest pipe length
L
A + B + C + D + e ≤ 150m(200m**) A + B + C + D + e ≤ 175m(225m**)
Longest pipe length after 1st branching
ℓ
B + C + D + e ≤ 40m(90m**)
High/Low difference (Outside unit ÷ Indoor unit)
H
H ≤ 50 m
High/Low difference (Indoor unit ÷ Indoor unit)
h
h ≤ 15 m
High/Low difference (Indoor unit ÷ Indoor unit)
h1
h ≤ 2 m
(**) : Conditional application
v
• When the pipe diameter (B) connected after 1st branching is larger than the main pipe diameter (A), Install the pipe with the pipe diameter (B)
after 1st branching that is the same as the main pipe diameter (A).
Ex) When connecting with 120% of the indoor unit to 10 HP.
1) Outside unit main pipe diameter: 22.2 (Gas pipe) / 9.52(Liquid pipe)
2) Pipe diameter after 1st branching by 120% indoor unit combination : 28.58 (Gas pipe) / 12.7 (Liquid pipe)
Therefore set the pipe diameter (B) after 1st branching to 22.2 (Gas pipe) / 9.52 (Liquid pipe) of main pipe diameter (A).
• 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.)
42, 44, 46, 48, 50, 52, 54, 56, 58, 60HP ............Ø 41.3
30
Outside Unit
Low/high pressure
common pipe (mm)
Ø19.05
Low/high pressure
common pipe(mm)
Ø19.05
Equivalent pipe length
Gas pipe (mm)
Slave2
Slave1
Master
Below
Below 2m
(h1)
10m
Ú Connecting branch pipe Ⓔ ~ 1st
branch part Ⓑ : Main pipe diameter (A)
Outside unit capacity Liquid pipe (mm)
42, 44, 46, 48, 50, 52,
54, 56, 58, 60HP
Ú Refrigerant pipe diameter from branch
to branch (B, C, D)
Total capacity of indoor
units connected to after
branching (kW)
≤ 5.6
< 16
< 22.4
< 33
< 47
< 71
< 104
104 ≤
For the first branch pipe (B), use the branch pipe
that fits the main pipe diameter (A).
42, 44, 46, 48, 50, 52, 54, 56, 58, 60HP............Ø 19.05 ' Ø 22.2
L 150m (200m**)
l 40m (90m**)
Ø 19.05
Liquid pipe
(mm)
Ø6.35
Ø9.52
Ø9.52
Ø9.52
Ø12.7
Ø15.88
Ø19.05
Ø19.05
Liquid pipe (mm)
Gas pipe (mm)
Ø 41.3
Gas pipe
(mm)
Ø12.7
Ø15.88
Ø19.05
Ø22.2
Ø28.58
Ø28.58
Ø34.9
Ø41.3
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