LG ARUB115BT2 Installation Manual - Page 34

Outdoor Unit Connection, Indoor Unit Connection

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Refrigerant piping installation N Outdoor Unit Connection ➲ Refrigerant pipe diameter before 1st branch (A,E,F) Upward outdoor unit total capacity [HP] 8 10 12 14, 16 18, 20 22, 24 Liquid pipe [mm(inch)] Ø9.52(3/8) Ø9.52(3/8) Ø12.7(1/2) Ø12.7(1/2) Ø15.88(5/8) Ø15.88(5/8) Gas pipe [mm(inch)] Low pressure High pressure Ø19.05(3/4) Ø15.88(5/8) Ø22.2(7/8) Ø19.05(3/4) Ø28.58(1-1/8) Ø19.05(3/4) Ø28.58(1-1/8) Ø22.2(7/8) Ø28.58(1-1/8) Ø22.2(7/8) Ø34.9(1-3/8) Ø28.58(1-1/8) WARNING Do not choose the main pipe diameter, namely A, 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. EX) Where connecting the indoor units to the 22 HP (61.5 kW) outdoor unit to 130% of its system capacity (79.9 kW) and branching one HR unit of four 7k indoor units (8.4kW) at the 1st branch. Main pipe diameter(22 HP outdoor unit): Ø15.88(5/8)(Liquid pipe), Ø34.9(1-3/8)(Low pressure gas pipe), Ø28.58(1-1/8)(High pressure gas pipe) Pipe diameter between 1st and 2nd branch (71.5kW indoor units): Ø19.05(Liquid pipe), Ø34.9(1-3/8)(Low pressure gas pipe) and Ø28.58(1-1/8)(High pressure gas pipe) in conformity with downward indoor units. Since the main pipe diameter of 22HP outdoor unit is Ø15.88(5/8)(Liquid pipe), Ø34.9(1-3/8)(Low pressure gas pipe) , Ø28.58(1-1/8)(High pressure gas pipe), it should be used as the diameter of the main pipe and the connection pipe between 1st and 2nd indoor branches. WARNING When the equivalent length between the outdoor unit and a indoor unit is 90 m or more, the size of main pipes (only liquid pipe) must be increased one grade. Liquid pipe 8, 10HP 9.52(3/8) ¡ Ø12.7(1/2) 12, 14, 16HP 12.7(1/2) ¡ Ø15.88(5/8) 18, 20, 22, 24HP 15.88(5/8) ¡ Ø19.05(3/4) N Indoor Unit Connection ➲ Indoor unit connecting pipe from branch (a~k) Indoor unit capacity [kW(Btu/h)] Liquid pipe [mm(inch)] ≤ 5.6(19,100) Ø6.35(1/4) < 16.0(54,600) Ø9.52(3/8) < 22.4(76,400) Ø9.52(3/8) Gas pipe [mm(inch)] Ø12.7(1/2) Ø15.88(5/8) Ø19.05(3/4) 34 Outdoor Unit

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34
Outdoor Unit
34
Outdoor Unit
Refrigerant piping installation
◆
Outdoor Unit Connection
➲
Refrigerant pipe diameter before 1st branch (A,E,F)
WARNING
When the equivalent length between the outdoor unit and a indoor unit is 90 m or more, the size of main
pipes (only liquid pipe) must be increased one grade.
WARNING
Do not choose the main pipe diameter, namely A, 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.
EX) Where connecting the indoor units to the 22 HP (61.5 kW) outdoor unit to 130% of its system capacity (79.9 kW) and
branching one HR unit of four 7k indoor units (8.4kW) at the 1st branch.
Main pipe diameter(22 HP outdoor unit):
Ø
15.88(5/8)(Liquid pipe),
Ø
34.9(1-3/8)(Low pressure gas pipe),
Ø
28.58(1-1/8)(High pressure gas pipe)
Pipe diameter between 1st and 2nd branch (71.5kW indoor units):
Ø
19.05(Liquid pipe),
Ø
34.9(1-3/8)(Low pressure gas pipe)
and
Ø
28.58(1-1/8)(High pressure gas pipe) in conformity with
downward indoor units.
Since the main pipe diameter of 22HP outdoor unit is
Ø
15.88(5/8)(Liquid pipe),
Ø
34.9(1-3/8)(Low pressure gas pipe) ,
Ø
28.58(1-1/8)(High pressure gas pipe), it should be used as the diameter of the main pipe and the connection pipe between 1st and
2nd indoor branches.
Liquid pipe
8, 10HP
..........................................
Ø
9.52(3/8)
→
Ø
12.7(1/2)
12, 14, 16HP
..................................
Ø
12.7(1/2)
→
Ø
15.88(5/8)
18, 20, 22, 24HP
............................
Ø
15.88(5/8)
→
Ø
19.05(3/4)
Upward outdoor unit total capacity
[HP]
8
Ø
9.52(3/8)
Ø
19.05(3/4)
Ø
15.88(5/8)
10
Ø
9.52(3/8)
Ø
22.2(7/8)
Ø
19.05(3/4)
12
Ø
12.7(1/2)
Ø
28.58(1-1/8)
Ø
19.05(3/4)
14, 16
Ø
12.7(1/2)
Ø
28.58(1-1/8)
Ø
22.2(7/8)
18, 20
Ø
15.88(5/8)
Ø
28.58(1-1/8)
Ø
22.2(7/8)
22, 24
Ø
15.88(5/8)
Ø
34.9(1-3/8)
Ø
28.58(1-1/8)
Liquid pipe
[mm(inch)]
Low pressure
High pressure
Gas pipe [mm(inch)]
◆
Indoor Unit Connection
➲
Indoor unit connecting pipe from branch (a~k)
Indoor unit capacity [kW(Btu/h)]
≤
5.6(19,100)
< 16.0(54,600)
< 22.4(76,400)
Ø
6.35(1/4)
Ø
9.52(3/8)
Ø
9.52(3/8)
Ø
12.7(1/2)
Ø
15.88(5/8)
Ø
19.05(3/4)
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]