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PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
41
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 diame-
ter A, B should be of the same size with A.
Ex)
In case indoor unit combination ratio ratio 130% is connected to 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]
Instead of using indoor unit total capacity, use outdoor unit model name in order to choose
main pipe diameter 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 24HP(70kW) outdoor unit to 130% of its sys-
tem capacity (91kW) and branching 7k Btu/h(2.2kW) indoor unit at the 1st branch
Main pipe diameter (24HP outdoor unit) 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.
Since the main pipe diameter of 24HP(20Ton) 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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