LG ARUN038GS2 Installation Manual page 30

Refrigerant piping installation
Refrigerant piping system
Example : 2 Outdoor units, 4 HR units and 10 indoor units
Outdoor unit
Y branch
HR unit
Indoor unit
H
Case 1 ("a")
: Maximum height is 15m(236ft) if you install with Y branch.
Case 2 ("b")
: Height is zero(0) m in HR unit serial connector.
WARNING
* : Serial connection of HR units : Capacity sum of indoor units
• Refer to the HR unit PCB part for the valve group control setting.
• It is recommended that difference in pipe lengths between an HR unit and indoor units, for example
difference in length of a, b, c, and d, be minimized. The larger difference in pipe lengths, the more different
performance between indoor units.
• Piping length from outdoor branch to outdoor unit
(For 18 HP or more)
If the large capacity indoor units(5~10 HP, using over Ø15.88(5/8) / Ø9.52(3/8))are installed, it should use
Valve Group setting.
30 Outdoor Unit
F2
E
E2
D1
a
D2
b
C1
c
D3
d
h
D4
Slave 1
A2
Master
A1
F1
E1
A
B1
B
C1
B2
"a"
C3
C2
g
D7
C2
f
e
D6
D5
160kBtu/hr
10m(33ft), equivalent length : max 13m(43ft)
D
C3
C4
j k
i
"b"
D9
D10
D8
*