Installation
24
24
Branch pipe can not be used after header
7.2.3 When installing 3 outside units
Ex) 6 Indoor Units connected
: Outside Unit
: Header branch
: Indoor Units
: Sealing
: Connection branch pipe between
Outside units:ARCNN30
: Connection branch pipe between
Outside units:ARCNN20
10m or
less
H Belo
w 50m
Master
Slave2
Slave1
L150m
l
40m
Below 2m
Below 2m
(h1)
(h1)
Below 2m
(h1)
➲
Slave1 outside unit ~ Connecting
branch unit
: Pipe diameter
between outside units (E)
➲
Connecting branch pipe
~ Header branch
part
: Main pipe diameter (A)
Outside unit capacity
Liquid pipe (mm)
Gas pipe (mm)
50, 60HP
Ø19.05
Ø41.3
• 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 (mm) Gas pipe (mm)
Low/high pressure
common pipe
Ø15.88/19.05
Ø34.9/41.3
Ø19.05
➲
Total refrigerant pipe length = A + B + C + D + a + b + c + d + e
≤
300 m
Longest pipe length (Equivalent pipe length)
A +f
≤
150 m(175 m)
Longest pipe length after 1st branching
f
≤
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 (Outside unit
↔
Outside unit)
h1
2 m
L
H
h
h1
Gas Pipe
Liquid Pipe
50, 60HP ......................................Ø41.3
50, 60HP ......................................Ø19.05
→
Ø22.2
➲
Slave2 outside unit ~ Connecting
branch pipe
: Pipe diameter
between outside units (F)
Liquid pipe (mm) Gas pipe (mm)
Low/high pressure
common pipe
Ø9.52/12.7
Ø22.2/28.58
Ø19.05
