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PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
40
Outdoor unit Connection
WARNING
!
• In case of pipe diameter B connected after first branch is bigger than the main pipe diame-
ter 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 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]
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.
Indoor Unit Connection
Indoor Unit connecting pipe from branch (a,b,c,d,e,f)
Indoor Unit capacity
[kW(Btu/h)]
≤ 5.6(19,100)
< 16.0(54,600)
< 22.4(76,400)
CAUTION
!
• 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 cause Performance unsatisfactory or
noise.
Liquid pipe [mm(inch)]
Ø6.35(1/4)
Ø9.52(3/8)
Ø9.52(3/8)
500mm or more
Gas pipe [mm(inch)]
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
500mm or more
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