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13
ENGLISH
(Table 2) Refrigerant pipe diameter from outside unit to first branch. (A)
Upward
Outside unit
total capacity
Standard Pipe
Diameter
Increased Pipe Diameter
When equivalent pipe length is
90m or more from ODU to far-
thest IDU
Ton HP
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
6~8 8~10 Ø 9.52(3/8) Ø 22.2(7/8) Ø 12.70(1/2) Ø 25.4(1)
10 12 Ø 12.7(1/2) Ø 25.4(1) Ø 15.88(5/8) Ø 28.58(1-1/8)
12 14 Ø 12.7(1/2) Ø 28.58(1-1/8) Ø 15.88(5/8) Ø 31.8(1-1/4)
14~16 18~20 Ø 12.7(1/2) Ø 28.58(1-1/8) Ø 15.88(5/8) Ø 31.8(1-1/4)
20~24 24~28 Ø 19.05(3/4) Ø 34.9(1-3/8) Ø 22.2(7/8) Ø 38.1(1-1/2)
28~48 34~54 Ø 19.05(3/4) Ø 41.3(1-5/8) Ø 22.2(7/8) Ø 44.5(1-3/4)
(Table 3) Refrigerant pipe diameter from first branch to last branch (B,C,D)
Downward indoor unit
total 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)
< 33.6 (114,700) Ø9.52(3/8) Ø22.2(7/8)
< 50.4 (172,000) Ø12.7(1/2) Ø28.58(1-1/8)
< 67.2 (229,400) Ø15.88(5/8) Ø28.58(1-1/8)
< 72.8(248,500) Ø15.88(5/8) Ø34.9(1-3/8)
< 100.8(344,000) Ø19.05(3/4) Ø34.9(1-3/8)
< 173.6(592,500) Ø19.05(3/4) Ø41.3(1-5/8)
< 184.8(630,700) Ø22.2(7/8) Ø44.5(1-3/4)
≤ 224.0(764,400)
Ø22.2(7/8) Ø53.98(2-1/8)
(Table 4) Conditional Application
• To satisfy below condition to make 40m(131ft) ~ 90m(295ft) of pipe length after
first branch.
Required Example
1
Select the diameter of the
pipe between the 1st
branch and the last branch
to be 1 level larger.
Provided that, it is not
necessary if the pipe di-
ameter is the same as the
main pipe.
40m(131ft)
< B+C+D+e ≤
90m(295ft)
’
Change B, C, and D
pipe diameter.
Ø6.35(1/4”) → Ø9.52(3/8”)
Ø9.52(3/8”) → Ø12.7(1/2”)
Ø12.7(1/2”) → Ø15.88(5/8”)
Ø15.88(5/8”) → Ø19.05(3/4”)
Ø19.05(3/4”) → Ø22.2(7/8”)
Ø22.2(7/8”) → Ø 25.4(1”)
Ø 25.4(1”) → Ø28.58(1-1/8”)
Ø28.58(1-1/8”) → Ø 31.8(1-1/4”)
Ø 31.8(1-1/4”) → Ø34.9(1-3/8”)
Ø34.9(1-3/8”) → Ø 38.1(1-1/2”)
2
During the calculation of
the total refrigerant pipe
length, the above pipe
length shall be calcu-
lated as twice.
A+Bx2+Cx2+
Dx2+a+b+c+d+e
≤ 500m(1640ft)
3
The length from each in-
door unit to the nearest
branch pipe ≤ 40m(131ft)
a,b,c,d,e
≤ 40m(131ft)
4
Length from outside unit
to the farthest indoor
unit] – [Length from out-
side unit to the nearest
indoor unit] ≤ 40m(131ft)
(A+B+C+D+e)-
(A+a)
≤ 40m(131ft)
L
H 50m(164ft)
40m(131ft)
IDU
Direction
WARNING
Pipe length after header branching (a~f)
It is recommended that difference in length of the pipes con-
nected to the Indoor Units is minimized. Performance difference
between Indoor Units may occur.
!
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
20HP(58kW) outside unit .
1) Outside unit main pipe diameter A : Ø28.58(1-1/8”)(gas pipe),
Ø12.7(1/2”)(liquid pipe)
2) Pipe diameter B after first branch according to 120% indoor unit ombi-
nation(69.6kW) : Ø28.58 (1-1/8”)(gas pipe), Ø15.88(5/8”) (liquid pipe)
Therefore, pipe diameter B connected after first branch would be
Ø28.58(1-1/8”) (gas pipe) / Ø12.7(1/2”)(liquid pipe) which is same with
main pipe diameter.
!
Outside unit Connection
Indoor Unit Connection
Indoor unit connecting pipe from branch (a~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)
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
Pipe Connection Method/Precautions for
Series connections between Outside units
- Separate Y branch joints are needed for series connections between
outside unit s.
- Please refer to the below connection examples to install pipe connec-
tions between outside unit s.
Pipe connection between outside
unit s (General Case)
The maximum pipe
length after the first
branching between the
outside unit is 10m(33ft)
or less
Pipes between outside unit s
are 2m(6.6ft) or less
2m(6.6ft) or less
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