Refrigerant Piping System - LG MULTI V S ARUB060GSS4 Installation Manual

16

Refrigerant piping system

Refrigerant Pipe Connection
Example : 12 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : Y branch
Ⓓ : Indoor Unit
Ⓖ : Header
Ⓗ : HR Unit
A1
1
D
a
D
2
b
H1
c
H
D
3
d
h
D
4
H3
g
i "b"
D
7
D
8 D
l m
9 D 10
■ Case 1 ("a")
: Maximum height is 15m(49ft) if you install with Y branch.
■ Case 2 ("b")
: Maximum height is 5m(16ft) in serial connection of HR units.
! WARNING
• 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 difference in pipe lengths, the
more different performance between indoor units.
* If the large capacity indoor units (Over 5 HP; using over
Ø15.88(5/8)/9.52(3/8) are installed, it should be used the Valve
Group setting
A
B1
B
C1
B2
"a"
C3
C2
H2
f
e
6 D
5 D
*
H4
k
j
G
sealing
x
n
D D D
11 12
Refrigerant pipe diameter from outdoor unit to first branch. (A)
Upward outdoor
unit total capacity
HP Liquid mm(inch)
Ø9.52
6
(3/8)
* If available on site, it use this size. Otherwise it can't be increased.
Refrigerant pipe diameter from branch to branch (B,C,D)
Downward Indoor
Unit total capacity Liquid pipe [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)
< 36.4(124,200) Ø9.52(3/8)
Total pipe length = A+B+C1+C2+C3+D+a+b+c+d+e+f+g+i+j+k+l+m+n
≤ 300m(984ft)
Longest pipe length
L
A+B+C3+D+k ≤150m(492ft)
Longest pipe length after 1st branch
B+C+D+e ≤ 40m(131ft)
Difference in height (Outdoor Unit ÷ Indoor Unit)
H
H ≤ 50m(164ft)
Difference in height (Indoor Unit ÷ Indoor Unit)
h
h ≤ 15m(49ft)
Difference in height(HR unit ÷ HR unit)
"a", "b"
a ≤ 15m(49ft) , b ≤ 5m(16ft)
• * : Assume equivalent pipe length of Y branch to be 500mm(19-
5/8inch), that of header to be 1000mm(39-1/4inch), calculation pur-
pose
• It is recommended that indoor unit is installed at lower position
than the header.
! WARNING
When the any one (or both) of below conditions are satisfied, the
diameter of main pipe (A) must be increased according to below
table.
- The equivalent length between outdoor unit and the farthest in-
door unit is 90m(295ft) or more (Liquid, High pressure gas pipes
and Low pressure gas pipes are increased)
- The level difference (Outdoor unit ↔ Indoor unit) is 50m(164ft) or
more (Only liquid pipe is increased)
Refrigerant pipe diameter from outdoor unit to first branch. (A)
Upward
outdoor unit Pipe diameter
total capacity
Low pres-
Liquid sure gas
HP
mm(inch) pipe
mm(inch)
Ø9.52 Ø19.05
6
(3/8) (3/4)
Pipe diameter
Low pressure gas High pressure gas
pipe pipe
mm(inch) mm(inch)
Ø19.05 Ø15.88
(3/4) (5/8)
Gas pipe [mm(inch)]
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
*Equivalent pipe length
A+B+C3+D+k ≤175m(574ft)
Pipe diameter when pipe
length is ≥ 90m(295 ft)
High pres- Low pres- High pres-
sure gas Liquid sure gas sure gas
pipe mm(inch) pipe
mm(inch) mm(inch) mm(inch)
Ø15.88 Ø 12.7 Ø 22.2 Ø 19.05
(5/8) (1/2) (7/8)
pipe
(3/4)