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ENGLISH
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(1-3/8)(Gas pipe),
Ø15.88(5/8)(liquid pipe)
2) Pipe diameter B after first branch according to 120% indoor
unit combination(80.6kW) : Ø34.9(1-3/8)(gas pipe),
Ø19.05(3/4)(liquid pipe)
Therefore, pipe diameter B connected after first branch
would be Ø34.9(1-3/8)(gas pipe) / Ø15.88(5/8)(liquid pipe)
which is same with main pipe diameter.
!
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.
Pipe connection between outdoor
units (General Case)
The maximum pipe
length after the first
branching between the
outdoor units is 10 m
[32.8 ft] or less
Pipes between outdoor units
are 2 m [6.6 ft] or less
2 m [6.6 ft] or less
- If the distance between the outdoor units becomes more than 2 m
[6.6 ft], apply Oil Traps between the gas pipes.
- If the outdoor unit is located lower than the main pipe, apply Oil Trap.
Pipes between outdoor units
are 2 m [6.6 ft] or longer
Oil Trap
Oil Trap
Oil Trap
2 m [6.6 ft] or less
2 m [6.6 ft] or less
2 m [6.6 ft] or less
0.2 m [0.66 ft]
2 m [6.6 ft] or longer
2 m [6.6 ft] or longer
2 m [6.6 ft] or longer
CAUTION
• Bending radius should be
at least twice the diameter
of the pipe.
• Bend pipe after 500mm
[19.7 inch] or more from
branch(or header).
Do not bend U type.
It may affect performance
or result in noise. If U type
bending is required, the R
should be more than
200mm [7.9 inch]
!
500mm [19.7 inch]
or more
500mm [19.7 inch]
or more
R
Toward indoor unit
Toward indoor unit
Pipe inclination (2° or more)
Toward indoor unit
Toward indoor unit
Toward indoor unit
Toward indoor unit
(Example 1)
(Example 2)
(Example 3)
- Apply Oil Trap as shown below when the length of the pipe between
the outdoor units is more than 2 m [6.6 ft]. Otherwise, the unit may
not operate properly.
(Example 1)
Toward indoor unit
≤ 2m
Examples of Wrong Pipe Connections
If the main pipe is
higher than the
outdoor units, oil is
accumulated in the
outdoor unit.
If there are differences in the height
between the outdoor units, oil is
accumulated in the lower outdoor unit.
Oil Trap
1,MFL67221438,영영 2018. 10. 4. 영영 11:29 Page 15
