Refrigerant piping system
Refrigerant Pipe Connection
Example : 12 Indoor Units connected
Ⓐ
: Outdoor Unit
Ⓑ
: Y branch
Ⓓ
: Indoor Unit
Ⓖ
: Header
Ⓗ
: HR Unit
Refrigerant pipe diameter from outdoor unit to first branch. (A)
* If available on site, it use this size. Otherwise it can’t be increased.
Refrigerant pipe diameter from branch to branch (B,C,D)
Total pipe length = A+B+C1+C2+C3+D+a+b+c+d+e+f+g+i+j+k+l+m+n
≤
300m(984ft)
Refrigerant pipe diameter from outdoor unit to first branch. (A)
A1
H1
D
1
2
D
D
D
3
4
C1
B
C2
C3
*
B1
B2
a
b
c
d
e
g
j
k
x
l
m
n
sealing
f
i
H
h
"a"
“b”
D
A
H2
H4
G
H3
■
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.
D
5
D
6
D
7
D
8
D
10
D
9
D
11
D
12
Upward outdoor
unit total capacity
Pipe diameter
HP
Liquid mm(inch)
Low pressure gas
pipe
mm(inch)
High pressure gas
pipe
mm(inch)
6
Ø9.52
(3/8)
Ø19.05
(3/4)
Ø15.88
(5/8)
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)
< 36.4(124,200)
Ø9.52(3/8)
Ø22.2(7/8)
L
Longest pipe length
*Equivalent pipe length
A+B+C3+D+k
≤
150m(492ft)
A+B+C3+D+k
≤
175m(574ft)
l
Longest pipe length after 1st branch
B+C+D+e
≤
40m(131ft)
H
Difference in height (Outdoor Unit
÷
Indoor Unit)
H
≤
50m(164ft)
h
Difference in height (Indoor Unit
÷
Indoor Unit)
h
≤
15m(49ft)
"a", "b"
Difference in height(HR unit
÷
HR unit)
a
≤
15m(49ft) , b
≤
5m(16ft)
Upward
outdoor unit
total capacity
Pipe diameter
Pipe diameter when pipe
length is
≥
90m(295 ft)
HP
Liquid
mm(inch)
Low pres-
sure gas
pipe
mm(inch)
High pres-
sure gas
pipe
mm(inch)
Liquid
mm(inch)
Low pres-
sure gas
pipe
mm(inch)
High pres-
sure gas
pipe
mm(inch)
6
Ø9.52
(3/8)
Ø19.05
(3/4)
Ø15.88
(5/8)
Ø 12.7
(1/2)
Ø 22.2
(7/8)
Ø 19.05
(3/4)
16
ENGLISH
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
!
• * : 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)
!
1,MFL69717904,영영 18. 8. 29. 영영 2:49 Page 16
