Installation Manual
35
ENGLISH
Refrigerant piping system
Master
Slave
L Below 150 m
H Below 50 m
h Below 15 m
Below 10m
Below 2m
l
Below 40 m
Ú
Slave outside unit ~ Connecting
branch pipe
Ⓖ
: Pipe diameter
between outside units (E)
Ú
Connecting branch pipe
Ⓖ
~ 1st Y
branch part
Ⓑ
: Main pipe diameter (A)
Ú
Refrigerant pipe diameter from branch
to branch (B, C)
Ú
Total refrigerant pipe length =
A + B + C + a + b + c + d + e ≤ 300m (500m**)
Total capacity of indoor units
connected to after branching (kW)
≤ 5.6
Ø6.35
Ø12.7
< 16
Ø9.52
Ø15.88
< 22.4
Ø9.52
Ø19.05
< 33
Ø9.52
Ø22.2
< 47
Ø12.7
Ø28.58
< 71
Ø15.88
Ø28.58
< 104
Ø19.05
Ø34.9
104 ≤
Ø19.05
Ø41.3
Liquid pipe
(mm)
Gas pipe
(mm)
2. When installing 2 outside units
Ex) 5 indoor units connected
Ⓐ
: Outside units
Ⓑ
: 1st Y branch
Ⓒ
: 2nd Y branch
Ⓓ
: Indoor unit
Ⓔ
: Header branch
Ⓕ
: Seal
Ⓖ
: Connecting branch pipe between outside units
h
Connecting branch pipe between outside units:
ARRCN20(
Ⓖ
)
For the first branch pipe (B), use the branch pipe
that fits the main pipe diameter (A).
Longest pipe length (Equivalent pipe length)
A +B +b,A +C +e ≤ 150 m(175 m)
Longest pipe length after 1st branching
B +b,C +e ≤ 40 m
High/Low difference (Outside unit
÷
Indoor unit)
H
≤
50 m
High/Low difference (Indoor unit
÷
Indoor unit)
h
≤
15 m
High/Low difference (Indoor unit
÷
Indoor unit)
h
≤
2 m
L
ℓ
H
h
h1
• 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).
• For the pipe length after the header branch (c~e), 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 diameter according to the outside unit capacity in accordance with the following table. (This
applies to both the liquid and gas pipes.)
Liquid pipe (mm) Gas pipe (mm)
Low/high pressure
common pipe(mm)
Ø9.52/12.7
Ø22.2/28.58
Ø19.05
Outside unit capacity
Liquid pipe (mm)
Gas pipe (mm)
24, 26, 28, 30 HP
Φ19.05
Φ34.9
32, 34, 36, 38, 40 HP
Φ19.05
Φ41.3
Gas pipe (mm)
Liquid pipe (mm)
24, 26, 28, 30 HP…………Ø 34.9
’
Ø 38.1
24, 26, 28, 30, 32, 34, 36, 38, 40 HP
…………Ø 19.05
’
Ø 22.2
32, 34, 36, 38, 40 HP………Ø 41.3
Summary of Contents for MULTI V WATER II ARWN Series
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