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PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
47
ENGLISH
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)
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 130% is connected to 20Ton(24HP(70kW)) 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 130% indoor unit combination(91kW): 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.
[Example]
nstead of using indoor unit total capacity, use outdoor unit model name in order to choose main pipe di-
ameter by downward.
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 20Ton(24HP(70kW))outdoor unit to 130% of its system ca-
pacity (91 kW) and branching 7k Btu/h(2.2kW) indoor unit at the 1st branch
1) Main pipe diameter 20Ton(24 HP) outdoor unit: Ø28.58(1-1/8, Gas pipe) Ø15.88(5/8, Liquid pipe)
Pipe diameter between 1st and 2nd branch (88.5kW indoor units):
Ø34.9(1-3/8, Gas pipe) Ø19.05(3/4, Liquid pipe) in conformity with downward indoor units.
2) Since the main pipe diameter of 20Ton(24 HP) outdoor unit is Ø28.58(1-1/8, Gas pipe) and
Ø15.88(5/8, Liquid pipe), Ø28.58 (1-1/8, Gas pipe) and Ø15.88(5/8, 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 500mm(1.64ft) or more
from branch(or header).
Do not bend U type.
It may cause Performance unsatisfactory or
noise.
!
500mm(1.64ft)
or more
500mm(1.64ft)
or more
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