28
Outside Unit
Refrigerant piping system
Refrigerant piping system
Y branch method
Ú
Refrigerant pipe diameter from
branch to branch (B,C,D)
Ú
Total pipe length =
A+B+C+D+a+b+c+d+e ≤ 300m (500m**)
Ú
Outside unit
Ⓐ
~ 1st branch
Ⓑ
:
Main pipe diameter (A)
L150m (200m : Conditional application)
Below H 50 m
l
40m (90m : Conditional application)
Below 15 m
Indoor unit
direction
• 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 diameter according to the outside unit capacity in accordance with the following table. (This
applies to both the liquid and gas pipes.)
Total capacity of indoor units con-
nected 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)
1. When installing 1 outside unit
independently
Ex) 5 indoor units connected
Ⓐ
: Outside unit
Ⓑ
: 1st branch (Y branch)
Ⓒ
: Indoor units
Ⓓ
: Indoor unit
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 + C + D + e
≤
150m(200m**) A + B + C + D + e
≤
175m(225m**)
Longest pipe length after 1st branching
B + C + D + e
≤
40m(90m**)
High/Low difference (Outside unit
÷
Indoor unit)
H
≤
50m
High/Low difference (Indoor unit
÷
Indoor unit)
h
≤
15m
L
ℓ
H
h
(**) : Conditional application
Outside unit capacity Liquid pipe (mm)
Gas pipe (mm)
8, 10HP
Ø 9.52
Ø 22.2
16, 18, 20HP
Ø 12.7
Ø 28.58
Gas pipe (mm)
Liquid pipe (mm)
8, 10 HP…………Ø 22.2
’
Ø 25.4
8, 10 HP…………Ø 9.52
’
Ø 12.7
16,18,20 HP………Ø 28.58
’
Ø 31.8
16,18,20 HP…………Ø 12.7
’
Ø 15.88
Summary of Contents for MULTI V WATER II ARWN Series
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