15
ENGLISH
(Table 4) Conditional Application
Condition
Example
1
Diameter of pipes be-
tween first branch and the
last branch should be in-
creased by one step, ex-
cept pipe diameter B,C,D
is same as Diameter A
40 m‹B+C+D+e
≤
90 m
’
B, C, D Change a
diameter
2
While calculating whole re-
frigerant pipe length, pipe
B,C,D length should be cal-
culated twice.
A+Bx2+Cx2+Dx2
+a+b+c+d+e
≤
1 000 m
3
Length of pipe from each
indoor unit to the closest
branch
a,b,c,d,e
≤
40 m
4
Length of pipe from out-
door unit to the farthest
indoor unit 5
(A+B+C+D+e)] - [Length
of pipe outdoor unit to the
closest indoor unit 1
(A+a)]
≤
40 m
(A+B+C+D+e)-
(A+a)
≤
40 m
• To satisfy below condition to make 40 m ~ 90 m of pipe length after first branch.
Ø6.35
’
Ø9.52,
Ø9.52
’
Ø12.7,
Ø12.7
’
Ø15.88, Ø15.88
’
Ø19.05,
Ø19.05
’
Ø22.2,
Ø22.2
’
Ø25.4,
Ø25.4
’
Ø28.58, Ø28.58
’
Ø31.8,
Ø31.8
’
Ø34.9, Ø34.9
’
Ø38.1
l
h 40m
H 110m
L
Indoor
Unit
WARNING
Pipe length after header branching (a~f)
It is recommended that difference in length of the pipes con-
nected to the Indoor Units is minimized. Performance difference
between Indoor Units may occur.
!
Outdoor unit Connection
Indoor Unit Connection
Indoor Unit connecting pipe from branch (a,b,c,d,e,f)
Indoor Unit 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)
< 28.0(95,900)
Ø9.52(3/8)
Ø22.2(7/8)
WARNING
• In case of pipe diameter B connected after first branch is bigger
than the main pipe diameter A, B should be of the same size
with A.
Ex) In case indoor unit combination ratio 120% is connected to
24HP(67.2 kW) outdoor unit.
1) Outdoor unit main pipe diameter A : Ø34.9(Gas pipe),
Ø15.88(liquid pipe)
2) Pipe diameter B after first branch according to 120% indoor
unit combination(80.6kW) : Ø34.9(gas pipe), Ø19.05(liquid
pipe)
Therefore, pipe diameter B connected after first branch
would be Ø34.9(gas pipe) / Ø15.88(liquid pipe) which is
same with main pipe diameter.
[Example]
Do not choose the main pipe diameter by downward indoor unit
total capacity but its outdoor unit model name.
Do not let the connection pipe from branch to branch exceed the
main pipe diameter chosen by outdoor unit model name.
EX) Where connecting the indoor units to the 22 HP (61.6 kW)
outdoor unit to 130% of its system capacity (80.1 kW) and
branching 7k (2.2kW) indoor unit at the 1st branch.
1) Main pipe diameter(22 HP outdoor unit): Ø28.58(gas pipe),
Ø15.88(Liquid pipe)
2) Pipe diameter between 1st and 2nd branch (77.9kW indoor
units) :
Ø34.9(Gas pipe), Ø19.05(Liquid pipe) in conformity with
downward indoor units.
Since the main pipe diameter of 22HP outdoor unit is
Ø28.58(gas pipe), Ø15.88(Liquid pipe) is used as the main
pipe and the connection pipe between 1st and 2nd branch.
!
CAUTION
• Bending radius should be
at least twice the diameter
of the pipe.
• Bend pipe after 500 mm or
more from branch(or
header).
Do not bend U type.
It may cause Performance
unsatisfactory or noise.
• If want U type, bending R
is more than 200 mm.
!
500mm or more
500mm or more
Pipe Connection Method/Precautions for
Series connections between Outdoor units
- Separate Y branch joints are needed for series connections between
outdoor units.
- Please refer to the below connection examples to install pipe connec-
tions between outdoor units.
- If the distance between the outdoor units becomes more than 2m,
apply Oil Traps between the gas pipes.
- If the outdoor unit is located lower than the main pipe, apply Oil Trap.
Pipe connection between outdoor
units (General Case)
The maximum pipe
length after the first
branching between the
outdoor units is 10m or
less
Pipes between outdoor units
are 2m or less
2m or less
Pipes between outdoor units
are 2m or longer
Oil Trap
Oil Trap
Oil Trap
2m or less
2m or less
2m or less
0.2m or more
2m or longer
2m or longer
2m or longer
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