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Installation of Outside Unit
4. Refrigerant Piping System
Cautions for Y branch pipe
• In case of pipe diameter connected after first branch(B) is bigger than the main pipe diameter(A), B should be of the same
size with A.
• Do not choose the main pipe diameter by downward indoor unit total capacity, but its outdoor/outside unit model name.
• Do not let the connection pipe from branch to branch exceed the main pipe diameter chosen by outdoor unit model name.
[Example 1] In case indoor unit combination ratio 120% is connected to 24HP(67.2 kW) outdoor unit.
- Outdoor unit main pipe diameter A : Ø34.9(Gas pipe), Ø15.88(liquid pipe)
- Pipe diameter B after first branch according to 120% indoor unit ombination(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 2] Where connecting the indoor units to the 22HP (61.6kW) outdoor unit to 130% of its system capacity (80.1kW)
and branching 7k (2.2kW) indoor unit at the 1st branch.
- Main pipe diameter(22 HP outdoor unit): Ø28.58(gas pipe), Ø15.88(Liquid pipe)
- 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.
Cautions for header branch pipe
• It is recommended to install the difference between the length of the pipe after header branch(a~f) and the length of the
pipe connected to indoor unit to be the minimum.
• As the pipe length difference increases, there may be performance differences between indoor units.
• Y branch and header branch cannot be used after header branch.
Indoor Unit connecting pipe (a~k)
Indoor Unit capacity
[kW(Btu/h)]
≤ 5.6(19,100)
< 16.0(54,600)
< 22.4(76,400)
≤ 28.0(95,900)
• Bending radius should be at least twice the diameter of the pipe.
• Bend pipe after 500mm 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.
Liquid pipe
[mm(inch)]
Ø6.35(1/4)
Ø9.52(3/8)
Ø9.52(3/8)
Ø9.52(3/8)
8
Installation
Gas pipe
[mm(inch)]
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
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