LG multi V ARUB160BT3 Instruction Manual page 36

Refrigerant piping system
(**) Conditional Application(Incase of D12 is the farthest indoor)
Below condition must be satisfied for 40m(131ft) ~ 90m(295ft) piping length after first branch.
1) Diameter of pipes between first branch and the last branch should be increased by one step,
except if the pipe diameter B,C3 is same as Diameter A(Main pipe diameter)
Ø6.35(1/4) ' Ø 9.52(3/8) ' Ø 12.7(1/2) ' Ø 15.88(5/8) ' Ø 19.05(3/4) ' Ø 22.2(7/8) ' Ø 25.4*(1),
Ø 28.58(1-1/8) ' Ø 31.8*(1-1/4), Ø 34.9(1-3/8) ' Ø 38.1*(1-1/2)
* : If available on site, it use this size. Otherwise it can't be increased.
2) While calculating total refrigerant piping length, pipe B,C3 length should be calculated twice.
A + B x 2 + C3 x 2 + C1 + C2 + a + b + c + d + e + f + g + i + j + k + l + m + n ≤ 1,000m(3,280ft)
3) Length of pipe from each indoor unit to the closest HR Unit (a,b,c,d,e,e,g,i,j,k,l,m,n) ≤
40m(131ft)
4) [Length of pipe from outdoor unit to the farthest indoor unit D12 (B+C3+K)]
- [Length of pipe outdoor unit to the closest indoor unit D1 (C1+a)] ≤ 40m(131ft)
WARNING
When the equivalent length between a outdoor and the farthest indoor unit
is 90m(295ft) or more, main pipe(A) must be increased one grade.
Ú Refrigerant pipe diameter from outdoor unit to first branch. (A)
Upward outdoor
unit total capacity
Liquid
HP
mm(inch)
8
9.52(3/8)
10
12
14 12.7(1/2)
16
18
20
15.88(5/8)
22
24
26
28
30
32
34
36
38
40
42
19.05(3/4)
44
46
48
50
52
54
56
58
60
62
64
66
68
70
22.2(7/8)
72
74
76
78
80
h If available on site, it use this size. Otherwise it can't be increased.
36 Outdoor Unit
Pipe diameter
Low pressure gas pipe High pressure gas pipe
mm(inch) mm(inch)
19.05(3/4) 15.88(5/8)
22.2(7/8)
19.05(3/4)
28.58(1-1/8)
22.2(7/8)
34.9(1-3/8)
28.58(1-1/8)
41.3(1-5/8)
34.9(1-3/8)
44.5(1-3/4) 41.3(1-5/8)
53.98(2-1/8) 44.5(1-3/4)
Pipe diameter when pipe length is 90m over to 1st branch
Liquid Low pressure gas pipe
mm(inch) mm(inch)
22.2(7/8)
12.7(1/2)
25.4(1)
15.88(5/8)
31.8(1-1/4)
19.05(3/4)
38.1(1-1/2)
22.2(7/8)
44.5(1-3/4)
25.4(1) 53.98(2-1/8)
High pressure gas pipe
mm(inch)
19.05(3/4)
22.2(7/8)
25.4(1)
31.8(1-1/4)
38.1(1-1/2)
44.5(1-3/4)
53.98(2-1/8)