LG ARUM080LTE5 Engineering Product Data Book page 734

Multi V 5
7. Refrigerant piping system
■ Outdoor unit Connection
* Maximum number of connectable units could be different in accordance with model line up of target region.
A : Refrigerant pipe diameter from outdoor unit to first branch
E : Refrigerant pipe diameter for outdoor unit capacity (Slave 1+ Slave 2+ Slave 3)
F : Refrigerant pipe diameter for outdoor unit capacity (Slave 2+ Slave 3)
G : Refrigerant pipe diameter for outdoor unit capacity (Slave 3)
Level Difference (Outdoor unit ↔ Outdoor unit)
Max length from first branch to each outdoor unit (L1, L2, L3)
WARNING
• In case of pipe diameter connected after first branch(B) is bigger than the main pipe diameter(A), B
should be of the same size with A.
• Do not choose the main pipe diameter by downward indoor unit total capacity, but its outdoor unit model
name.
• Do not let the connection pipe from branch to branch exceed the main pipe diameter chosen by outdoor
unit model name.
[Example 1] In case indoor unit combination ratio 120% is connected to 24HP(67.2 kW) outdoor unit.
1. Outdoor unit main pipe diameter A : Ø34.9(Gas pipe), Ø15.88(liquid pipe)
2. Pipe diameter B after first branch according to 120% indoor unit ombination(80.6kW) : Ø34.9(gas pipe),
Ø19.05(liquid pipe)
Therefore, pipe diameter B connected after first branch would be Ø34.9(gas pipe) / Ø15.88(liquid pipe) which is
same with main pipe diameter.
[Example 2] Where connecting the indoor units to the 22 HP (61.6 kW) outdoor unit to 130% of its system capacity
(80.1kW) and branching 7k (2.2kW) indoor unit at the 1st branch.
1. Main pipe diameter(22 HP outdoor unit): Ø28.58(gas pipe), Ø15.88(Liquid pipe)
2. Pipe diameter between 1st and 2nd branch (77.9kW indoor units) :
Ø34.9(Gas pipe), Ø19.05(Liquid pipe) in conformity with downward indoor units.
Since the main pipe diameter of 22HP outdoor unit is Ø28.58(gas pipe), Ø15.88(Liquid pipe) is used as the main
pipe and the connection pipe between 1st and 2nd branch.
Slave1
Master
L2
L3
Indoor
Unit
1st branch
Refrigerant pipe diameter from outdoor unit to first branch
l 40m
d
d
d d
h 40m
Slave2
H1
L1
d
(equivalent length of piping 13m [42.7ft])
Installation of Outdoor Units
Slave3
5m [16.4ft]
Less than 10m [32.8ft]
23