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22
ENGLISH
(Table 2) Refrigerant pipe diameter from outdoor unit to first branch. (A)
ODU
capacity
(HP(ton))
Pipe diameter when pipe
Length is <90 m (295 ft)
(Standard)
Pipe diameter when pipe
length (ODU ↔ IDU)
is ≥90 m (295 ft)
Pipe diameter when height
differential (ODU ↔ IDU)
is >50 m (164 ft)
Liquid pipe
[mm(inch)]
Vapor pipe
[mm(inch)]
Liquid pipe
[mm(inch)]
Vapor pipe
[mm(inch)]
Liquid pipe
[mm(inch)]
Vapor pipe
[mm(inch)]
Outdoor unit Connection
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 ratio 130 % is connected to
24 HP(70 kW) outdoor unit.
1) Outdoor unit main pipe diameter A : Ø 34.9(1-3/8, gas pipe),
Ø 15.88(5/8, liquid pipe)
2) Pipe diameter B after first branch according to 130 % indoor
unit combination(91 kW) : Ø 34.9(1-3/8, gas pipe),
Ø 19.05(3/4, liquid pipe)
Therefore, pipe diameter B connected after first branch
would be Ø 34.9(1-3/8, gas pipe) / Ø 15.88(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 24 HP(70 kW) outdoor
unit to 130 % of its system capacity (91 kW) and branching
7 kBtu/h(2.2 kW) indoor unit at the 1st branch
Main pipe diameter (24 HP outdoor unit) outdoor unit): Ø 28.58
(1-1/8, Gas pipe) Ø 15.88(5/8, Liquid pipe)
Pipe diameter between 1st and 2nd branch (88.5 kW indoor
units) : Ø 34.9(1-3/8, Gas pipe) Ø 19.05(3/4, Liquid pipe) in
conformity with downward indoor units.
Since the main pipe diameter of 24 HP(20 Ton) outdoor unit is
Ø 28.58(1-1/8, Gas pipe) and Ø 15.88(5/8, Liquid pipe), Ø 28.58(1-
1/8, Gas pipe) and Ø 15.88(5/8, 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)]
Liquid pipe
[mm(inch)]
Gas pipe [mm(inch)]
≤ 5.6(19 100)
Ø 6.35(1/4) Ø 12.7(1/2)
< 16.0(54 600) Ø 9.52(3/8) Ø 15.88(5/8)
< 22.4(76 400) Ø 9.52(3/8) Ø 19.05(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)
Ø 6.35(1/4) Ø 12.7(1/2)
< 16.0(54 600) Ø 9.52(3/8) Ø 15.88(5/8)
≤ 22.4(76 400)
Ø 9.52(3/8) Ø 19.05(3/4)
< 33.6(114 700) Ø 9.52(3/8) Ø 22.2(7/8)
< 50.4(172 000) Ø 12.7(1/2) Ø 28.58(1-1/8)
< 67.2(229 400) Ø 15.88(5/8) Ø 28.58(1-1/8)
< 72.8(248 500) Ø 15.88(5/8) Ø 34.9(1-3/8)
< 100.8(344 000) Ø 19.05(3/4) Ø 34.9(1-3/8)
< 173.6(592 500) Ø 19.05(3/4) Ø 41.3(1-5/8)
(Table 4) Conditional Application
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
24 HP(67.2 kW) outdoor unit.
1) Outdoor unit main pipe diameter A : Ø 34.9(Gas pipe),
Ø 15.88(liquid pipe)
2) Pipe diameter B after first branch according to 120 % indoor
unit ombination(80.6 kW) : Ø 34.9(gas pipe), Ø 19.05(liquid pipe)
Therefore, pipe diameter B connected after first branch would
be Ø 34.9(gas pipe) / Ø 15.88(liquid pipe) which is same with
main pipe diameter.
!
Condition Example
1
Diameter of pipes
between first branch
and the last branch
should be increased by
one step, except pipe
diameter B,C,D is same
as Diameter A
40 m [131 ft] <
B+C+D+e
90 m [295 ft]
’ B, C, D
Change a diameter
2
While calculating whole
refrigerant pipe length,
pipe B,C,D length
should be calculated
twice.
A+Bx2+Cx2+Dx2
+a+b+c+d+e ≤
1 000 m [3 281 ft]
3
Length of pipe from
each indoor unit to the
closest branch
a,b,c,d,e ≤
40 m [131 ft]
4
Length of pipe from
outdoor unit to the
farthest indoor unit 5
(A+B+C+D+e)] -
[Length of pipe outdoor
unit to the closest
indoor unit 1 (A+a)] ≤
40 m [131 ft]
(A+B+C+D+e)-(A+a)
≤ 40 m [131 ft]
• To satisfy below condition to make 40 m ~ 90 m of pipe length after first branch.
Ø 6.35(1/4) ’ Ø 9.52(3/8), Ø 9.52(3/8) ’
Ø 12.7(1/2), Ø 12.7(1/2) ’ Ø 15.88(5/8),
Ø 15.88(5/8) ’ Ø 19.05(3/4),
Ø 19.05(3/4) ’ Ø 22.2(7/8), Ø 22.2(7/8) ’
Ø 25.4(1), Ø 25.4(1) ’ Ø 28.58(1-1/8),
Ø 28.58(1-1/8) ’ Ø 31.8(1-1/4),
Ø 31.8(1-1/4) ’ Ø 34.9(1-3/8),
Ø 34.9(1-3/8) ’ Ø 38.1(1-1/2)
l
h 40 m [131 ft]
H 110 m [361 ft]
L
Indoor
Unit
8(6) Ø 9.52(3/8) Ø 19.05(3/4) Ø 12.7(1/2) Ø 22.2(7/8) Ø 12.7(1/2) Not increased
10(8) Ø 9.52(3/8) Ø 22.2(7/8) Ø 12.7(1/2) Ø 28.58(1-1/8) Ø 12.7(1/2) Not increased
12(10)~14(12)
Ø 12.7(1/2) Ø 28.58(1-1/8) Ø 15.88(5/8) Not increased Ø 15.88(5/8) Not increased
18(14)~22(18)
Ø 15.88(5/8) Ø 28.58(1-1/8) Ø 19.05(3/4) Ø 31.8(1-1/4) Ø 19.05(3/4) Not increased
24(20) Ø 15.88(5/8) Ø 34.9(1-3/8) Ø 19.05(3/4) Not increased Ø 19.05(3/4) Not increased
26~34(22~28)
Ø 19.05(3/4) Ø 34.9(1-3/8) Ø 22.2(7/8) Ø 38.1(1-1/2) Ø 22.2(7/8) Not increased
36~50(30~42)
Ø 19.05(3/4) Ø 41.3(1-5/8) Ø 22.2(7/8) Not increased Ø 22.2(7/8) Not increased
• Bending radius should be
at least twice the
diameter of the pipe.
• Bend pipe after 500 mm
[19.7 inch] 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 200 mm
[7.9 inch].
CAUTION
!
500 mm [19.7 inch]
or more
500 mm [19.7 inch]
or more
R
1,MFL68980308,영영 2018. 11. 13. 영영 3:23 Page 22
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