24
ENGLISH
(Table 2) Refrigerant pipe diameter from outdoor unit to first branch. (A)
ODU
capacity
(hp)
Pipe diameter when pipe
length is < 90 m (295 ft)
(Standard)
Pipe diameter when pipe
length is
≥
90 m (295 ft)
Pipe diameter when height differential
(ODU
÷
IDU) is > 50 m (164 ft)
Liquid Pipe
mm (inch)
Gas Pipe
mm (inch)
Liquid Pipe
mm (inch)
Gas Pipe
mm (inch)
Liquid Pipe
mm (inch)
Gas Pipe
mm (inch)
8
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
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
12~16
Ø 12.7 (1/2) Ø 28.58 (1-1/8) Ø 15.88 (5/8) Ø 34.9 (1-3/8) Ø 15.88 (5/8) Not increased
18~22
Ø 15.88 (5/8) Ø 28.58 (1-1/8) Ø 19.05 (3/4) Ø 34.9 (1-3/8) Ø 19.05 (3/4) Not increased
24
Ø 15.88 (5/8) Ø 34.9 (1-3/8) Ø 19.05 (3/4) Ø 41.3 (1-5/8) Ø 19.05 (3/4) Not increased
26~34
Ø 19.05 (3/4) Ø 34.9 (1-3/8)
Ø 22.2 (7/8)
Ø 41.3 (1-5/8)
Ø 22.2 (7/8) Not increased
36~60
Ø 19.05 (3/4) Ø 41.3 (1-5/8)
Ø 22.2 (7/8)
Ø 44.5 (1-3/4)
Ø 22.2 (7/8) Not increased
62~64
Ø 22.2 (7/8)
Ø 44.5 (1-3/4)
Ø 25.4 (1)
Ø 53.98 (2-1/8)
Ø 25.4 (1)
Not increased
66~96
Ø 22.2 (7/8) Ø 53.98 (2-1/8)
Ø 25.4 (1)
Ø 53.98 (2-1/8)
Ø 25.4 (1)
Not increased
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 120 % is connected to
70 kW outdoor unit.
1) Outdoor unit main pipe diameter A : Ø 34.9(1-3/8))
(Low pressure gas pipe), Ø 15.88(5/8)(liquid pipe),
Ø 28.58(1-1/8)(High Pressure liquid pipe)
2) Pipe diameter B after first branch according to 120 %
indoor unit combination(84 kW) : Ø 34.9(1-3/8)
(Low pressure gas pipe), Ø 19.05(3/4)(liquid pipe),
Ø 28.58(1-1/8)(High Pressure liquid pipe)
Therefore, pipe diameter B connected after first branch
would be Ø 34.9(1-3/8)(Low pressure gas pipe),
Ø 15.88(5/8)(liquid pipe), Ø 28.58(1-1/8)(High Pressure
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 (61.5 kW)
outdoor unit to 120 % of its system capacity (73.8 kW) and
branching 7 k (2.1 kW) indoor unit at the 1st branch
Main pipe diameter(22 HP outdoor unit):
Ø 28.58(1-1/8)(Low pressure gas pipe), Ø 15.88(5/8)(Liquid pipe),
Ø 22.2(7/8)(High pressure gas pipe)
Pipe diameter between 1st and 2nd branch (71.7 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 22HP outdoor unit is
Ø 28.58(1-1/8)(Low pressure gas pipe), Ø 15.88(5/8)(Liquid pipe),
Ø 22.2(7/8) (High pressure gas 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)
< 28.0(95,900)
Ø 9.52(3/8)
Ø 22.2(7/8)
(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)
< 184.8(630,700)
Ø 22.2(7/8)
Ø 44.5(1-3/4)
≤
224.0(764,400)
Ø 22.2(7/8)
Ø 53.98(2-1/8)
(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(1-3/8)(Gas
pipe), Ø 15.88(5/8)(liquid pipe)
2) Pipe diameter B after first branch according to 120 %
indoor unit combination(80.6 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.
!
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 [36
1
ft]
L
Indoor
Unit
Summary of Contents for Multi V 5 ARUM080LTE5
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