LG ARWB80LA2 - Refrigerant Piping System Design; System Layout and Length Limits

Refrigerant piping system
32 Outside Unit
Refrigerant piping system
Example : 3 Outside units, 4 HR units and 10 indoor units
Outside unit
Y branch
HR unit
Indoor unit
Connection branch pipe
between Outdoor units
WARNING
* : Serial connection of HR units : Capacity sum of indoor units ≤ 160kBtu/h (47.0kW)
• 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 ≤ 10m, equivalent length : max 13m (For 30 HP or more)
❈ If the large capacity indoor units(5~10 HP, using over Ø15.88/Ø9.52) are installed, it should use Valve
Group setting.
A1
C1
D1
D2
D3
D4
D6
D7
D8
D9
D10
E1
E2
A
F3
C1
B
C2
C3
*
B1
B2
A2
A3
a
b
c
d
e
g
j
k
f
i
H
h
"a"
"b"
F2
F1
D
E
C2
D5
C4
C3
Master
Slave 1
Slave 2
■ Case 1 ("a")
: Maximum height is 15 m if you install with Y branch.
■ Case 2 ("b")
: Height is zero(0) m in HR unit serial connector.
Refrigerant Piping System