LG MULTI V IV ARUB080BTE4 Installation Manual page 16

16
3) Length of pipe from each indoor unit to the HR Unit
(a,b,c,d,e,f,g,i,j,k,l,m,n) ≤ 40 m
4) [Length of pipe from outdoor unit to the farthest indoor unit D12
(A+B+C+D+e)]
- [Length of pipe outdoor unit to the closest indoor unit D1(C1+a)] ≤ 40
m
Refrigerant pipe diameter from branch to branch (B,C,D)
WARNING
!
* : Serial connection of HR units : Capacity sum of indoor units ·
192.4 kBtu/hr
• Refer to the HR unit PCB part for the valve group control setting.
• 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 dif-
ference in pipe lengths, the more different performance between
indoor units.
• Piping length from outdoor branch to outdoor unit ≤ 10m, equiva-
lent length : max 13m (for 22HP or more)
* If the large capacity indoor units (Over 5 HP; using over
Ø15.88/Ø9.52) are installed, it should be used the Valve Group
setting
Refrigerant pipe diameter from branch to branch (B,C)
Downward indoor
Liquid pipe
unit total capacity
[mm(inch)]
[kW(Btu/h)]
≤ 5.6(19,100)
Ø6.35(1/4)
< 16.0 (54,600) Ø9.52(3/8)
< 22.4 (76,400) Ø9.52(3/8)
< 33.6(114,700) Ø9.52(3/8)
< 50.4(229,000) Ø12.7(1/2)
< 61.6(210,600) Ø15.88(5/8)
< 72.8(210,600) Ø15.88(5/8)
< 100.8(344,000) Ø19.05(3/4)
< 173.6(592,500) Ø19.05(3/4)
< 184.8(630,700) Ø22.2(7/8)
≤ 224.0(764,400)
Ø22.2(7/8)
Total pipe length = A + B + C1 + C2 + C3 + a + b + c + d
+ e + f + g + i + j + k + l + m + n ≤ 1,000m
Longest pipe length
L
A+B+C3+D+k ≤ 150m(200m**) A+B+C3+D+k ≤ 175m(225m**)
Longest pipe length after 1st branch
l
B+C3+D+k ≤ 40m(90m**)
Difference in height(Outdoor Unit ÷ Indoor Unit)
H
H ≤ 110m
Difference in height (Indoor Unit ÷ Indoor Unit)
h
h ≤ 40m
Difference in height (Outdoor Unit ÷ Outdoor Unit)
h1
h1 ≤ 5m
Difference in height(HR unit ÷ HR unit)
"a", "b"
a ≤ 15m , b ≤ 5m ,
- * : Assume equivalent pipe length of Y branch to be 0.5m, that of
header to be 1m, calculation purpose
- It is recommended that indoor unit is installed at lower position than
the header.
- ** : To apply conditional application.
! WARNING
When the equivalent length between a outdoor and the farthest in-
door unit is 90m or more, main pipe(A) must be increased one
grade.
Gas pipe [mm(inch)]
Low pressure High pressure
Ø12.7(1/2) Ø9.52(3/8)
Ø15.88(5/8) Ø12.7(1/2)
Ø19.05(3/4) Ø15.88(5/8)
Ø22.2(7/8) 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)
Ø34.9(1 3/8) Ø28.58(1 1/8)
Ø41.3(1 5/8) Ø34.9(1 3/8)
Ø44.5(1 3/4) Ø41.3(1 5/8)
Ø53.98(2 1/8) Ø44.5(1 3/4)
* Equivalent pipe length
Refrigerant pipe diameter from outdoor unit to first
branch. (A)
Upward
outdoor
Pipe diameter
unit total
capacity
Low pres- High pres-
Liquid sure gas
HP
mm(inch) pipe
mm(inch)
8 19.05(3/4) 15.88(5/8)
9.52(3/8)
10 22.2(7/8)
19.05(3/4)
12
14 12.7(1/2)
16 28.58(1-1/8)
18
20
15.88(5/8)
22
24
26
28 34.9(1-3/8)
30
28.58(1-1/8)
32
34
36
38
40
42
19.05(3/4)
44
46
48 41.3(1-5/8)
50
34.9(1-3/8)
52
54
56
58
60
62
44.5(1-3/4) 41.3(1-5/8)
64
66
68
70
22.2(7/8)
72
53.98(2-1/8) 44.5(1-3/4)
74
76
78
80
* If available on site, it use this size. Otherwise it can't be increased.
Y branch, Header and HR unit connection pattern
Pattern 1
B
HR1 HR2
1 2 3
48k 48k 48k
• Impossible installation : Head branch pipe
Pipe diameter when pipe length is
90m over to 1st branch
Low pres- High pres-
sure gas Liquid sure gas sure gas
pipe mm(inch) pipe
mm(inch) mm(inch) mm(inch)
22.2(7/8) 19.05(3/4)
12.7(1/2)
25.4(1)
22.2(7/8)
15.88(5/8)
31.8(1-1/4)
22.2(7/8) 25.4(1)
19.05(3/4)
38.1(1-1/2)
31.8(1-1/4)
22.2(7/8)
44.5(1-3/4)
38.1(1-1/2)
44.5(1-3/4)
25.4(1) 53.98(2-1/8)
53.98(2-1/8)
4
48k
HR unit
pipe