Refrigerant Piping System - LG MULTI V S ARUB060GSS4 Installation Manual

14

Refrigerant piping system

Refrigerant Pipe Connection
Example : 12 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : Y branch
Ⓓ : Indoor Unit
Ⓖ : Header
Ⓗ : HR Unit
A1
A
1
D
a
D
2
b
H1
c
H
D
3
"a"
d
h
D
4
5 D
H3
g
i "b"
H4
D 7
D
j
x
8 D
l m
9 D 10 D 11
■ Case 1 ("a")
: Maximum height is 15 m (49 ft) if you install with Y branch.
■ Case 2 ("b")
: Maximum height is 5 m (16 ft) 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 Ø 15.88
(5/8) / 9.52 (3/8) are installed, it should be used the Valve Group
setting
B1
B
C1
B2
C3
C2
H2
f
e
6 D
*
k
G
sealing
n
D 12 D
Refrigerant pipe diameter from outdoor unit to first branch. (A)
Upward outdoor
unit total capacity
HP Liquid mm(inch)
Ø 9.52
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)
Ø 6.35 (1/4)
< 16.0 (54 600) Ø 9.52 (3/8)
≤ 22.4 (76 400)
Ø 9.52 (3/8)
< 36.4 (124 200) Ø 9.52 (3/8)
Total pipe length = A+B+C1+C2+C3+D+a+b+c+d+e+f+g+i+j+k+l+m+n
≤ 300 m (984 ft)
Longest pipe length
L
A+B+C3+D+k ≤150 m (492 ft) A+B+C3+D+k ≤175 m (574 ft)
Longest pipe length after 1st branch
B+C+D+e ≤ 40 m (131 ft)
Difference in height (Outdoor Unit ÷ Indoor Unit)
H
H ≤ 50 m (164 ft)
Difference in height (Indoor Unit ÷ Indoor Unit)
h
h ≤ 15 m (49 ft)
Difference in height (HR unit ÷ HR unit)
"a", "b"
a ≤ 15 m (49 ft) , b ≤ 5 m (16 ft)
• * : Assume equivalent pipe length of Y branch to be 500 mm
(19-5/8 inch), that of header to be 1 000 mm (39-1/4 inch),
calculation purpose
• 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
indoor unit is 90 m (295 ft) or more (Liquid, High pressure gas
pipes and Low pressure gas pipes are increased)
- The level difference (Outdoor unit ↔ Indoor unit) is 50 m (164 ft)
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
Liquid pressure pressure
HP
mm(inch) gas pipe gas pipe
mm(inch) mm(inch)
Ø 9.52 Ø 19.05 Ø 15.88
6
(3/8) (3/4)
Pipe diameter
Low pressure High pressure
gas pipe gas pipe
mm(inch) mm(inch)
Ø 19.05 Ø 15.88
(3/4) (5/8)
Gas pipe [mm(inch)]
Ø 12.7 (1/2)
Ø 15.88 (5/8)
Ø 19.05 (3/4)
Ø 22.2 (7/8)
*Equivalent pipe length
Pipe diameter when pipe
length is ≥ 90 m (295 ft)
High Low High
Liquid pressure pressure
mm(inch) gas pipe gas pipe
mm(inch) mm(inch)
Ø 12.7 Ø 22.2 Ø 19.05
(5/8) (1/2) (7/8) (3/4)