LG ARUN080LTE4 Installation Manual Download Page 13

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ENGLISH

(Table 2) Refrigerant pipe diameter from outdoor unit to first branch. (A)

(Table 3) Refrigerant pipe diameter from first branch to last branch (B,C,D)

Upward

Outdoor unit

total capacity

Standard Pipe

Diameter

Increased Pipe Diameter

When equivalent pipe length is 90m

or more from ODU to farthest IDU

When level difference is

50m or more

Liquid pipe

[mm(inch)]

Gas pipe

[mm(inch)]

Liquid pipe

[mm(inch)]

Gas pipe

[mm(inch)]

Liquid pipe

[mm(inch)]

Gas pipe

[mm(inch)]

Ø 9.52(3/8)

Ø 19.05(3/4)

Ø 12.7(1/2)

Ø 22.2(7/8)

Ø 12.7(1/2) not increased

Ø 9.52(3/8)

Ø 22.2(7/8)

Ø 12.7(1/2)

Ø 25.4(1)

Ø 12.7(1/2) not increased

12 ~ 14

Ø 12.7(1/2) Ø 28.58(1-1/8) Ø 15.88(5/8) not increased Ø 15.88(5/8) not increased

Ø 12.7(1/2) Ø 28.58(1-1/8) Ø 15.88(5/8) Ø 31.8(1-1/4) Ø 15.88(5/8) not increased

18 ~ 22

Ø 15.88(5/8) Ø 28.58(1-1/8) Ø 19.05(3/4) Ø 31.8(1-1/4) Ø 19.05(3/4) not increased

Ø 15.88(5/8) Ø 34.9(1-3/8) Ø 19.05(3/4) not increased Ø 19.05(3/4) not increased

26 ~ 34

Ø 19.05(3/4) Ø 34.9(1-3/8) Ø 22.2(7/8) Ø 38.1(1-1/2)

Ø 22.2(7/8) not increased

36 ~ 60

Ø 19.05(3/4) Ø 41.3(1-5/8) Ø 22.2(7/8) not increased Ø 22.2(7/8) not increased

62 ~ 64

Ø 22.2(7/8) Ø 44.5(1-3/4)

Ø 25.4(1)

Ø 53.98(2-1/8)

Ø 25.4(1)

not increased

66 ~ 80

Ø 22.2(7/8) Ø 53.98(2-1/8)

Ø 25.4(1)

not increased

Ø 25.4(1)

not increased

Downward indoor unit

total capacity [kW(Btu/h)]

Liquid pipe

[mm(inch)]

Gas pipe

[mm(inch)]

≤

5.6(19,100)

Ø6.35(1/4)

Ø12.7(1/2)

< 16.0 (54,600)

Ø9.52(3/8)

Ø15.88(5/8)

≤

22.4 (76,400)

Ø9.52(3/8)

Ø19.05(3/4)

< 33.6 (114,700)

Ø9.52(3/8)

Ø22.2(7/8)

< 50.4 (172,000)

Ø12.7(1/2)

Ø28.58(1-1/8)

< 67.2 (229,400)

Ø15.88(5/8)

Ø28.58(1-1/8)

< 72.8(248,500)

Ø15.88(5/8)

Ø34.9(1-3/8)

< 100.8(344,000)

Ø19.05(3/4)

Ø34.9(1-3/8)

< 173.6(592,500)

Ø19.05(3/4)

Ø41.3(1-5/8)

< 184.8(630,700)

Ø22.2(7/8)

Ø44.5(1-3/4)

≤

224.0(764,400)

Ø22.2(7/8)

Ø53.98(2-1/8)

(Table 4) Conditional Application

WARNING

• In case of pipe diameter B connected after first branch is bigger than

the main pipe diameter A, B should be of the same size with A.

Ex) 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.

WARNING

Pipe length after header branching (a~f)

It is recommended that difference in length of the pipes con-
nected to the Indoor Units is minimized. Performance difference
between Indoor Units may occur.

Outdoor unit Connection

Indoor Unit Connection

Indoor Unit connecting pipe from branch (a,b,c,d,e,f)

Indoor Unit capacity

[kW(Btu/h)]

Liquid pipe

[mm(inch)]

Gas pipe [mm(inch)]

≤

5.6(19,100)

Ø6.35(1/4)

Ø12.7(1/2)

< 16.0(54,600)

Ø9.52(3/8)

Ø15.88(5/8)

< 22.4(76,400)

Ø9.52(3/8)

Ø19.05(3/4)

< 28.0(95,900)

Ø9.52(3/8)

Ø22.2(7/8)

WARNING

• In case of pipe diameter B connected after first branch is bigger

than the main pipe diameter A, B should be of the same size
with A.

Ex) 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]
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.

EX) Where connecting the indoor units to the 22 HP (61.6 kW)

outdoor unit to 130% of its system capacity (80.1 kW) 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.

CAUTION

• Bending radius should be

at least twice the diameter
of the pipe.

• Bend pipe after 500 mm or

more from branch(or
header).
Do not bend U type.
It may cause Performance
unsatisfactory or noise.

• If want U type, bending R

is more than 200 mm.

500mm or more

Condition

Example

Diameter of pipes be-
tween first branch and the
last branch should be in-
creased by one step, ex-
cept pipe diameter B,C,D
is same as Diameter A

40 m < B+C+D+e