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14
3 Outdoor Units
Example : 5 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch(Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Connection branch pipe be-
tween Outdoor units: ARCNN31
Ⓕ : Connection branch pipe be-
tween Outdoor units: ARCNN21
Ⓖ : Header
Ⓗ : Sealing
Branch pipe can not be used after header
4 Outdoor Units
Example : 5 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch(Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Connection branch pipe be-
tween Outdoor units: ARCNN41
Ⓕ : Connection branch pipe be-
tween Outdoor units: ARCNN31
Ⓖ : Connection branch pipe be-
tween Outdoor units: ARCNN21
Branch pipe can not be used after header
Ⓗ : Header
Ⓘ : Sealing
Pipe Connection Method between outdoor
unit/indoor unit
Master
L2
L3
Indoor
Unit
1st branch
l 40m
h 40m
h See Table 2
A : Refrigerant pipe diameter from outdoor unit to first branch
E : Refrigerant pipe diameter for outdoor unit capacity
(Slave 1+ Slave 2)
F : Refrigerant pipe diameter for outdoor unit capacity
(Slave 2)
Level Difference
(Outdoor unit ↔ Outdoor unit)
Max length from first branch to
each outdoor unit (L1, L2, L3)
Slave2
Slave1
Master
10m or
ODU Capacity
less
Master ≥ Slave1 ≥ Slave2
h1
F
F
E
E
L 150m(200m : Conditional application)
40m(90m : Conditional application)
Slave3
Slave2
Slave1
Master
ODU Capacity
h1
Master ≥ Slave1 ≥ Slave2 ≥ Slave3
G
G
F
F
E
E
10m or
less
L 150m(200m : Conditional application)
40m(90m : Conditional application)
Slave1
Slave2
H1
L1
Refrigerant pipe diameter from outdoor unit to first branch
5m
Less than 10m
(equivalent length of piping 13m)
(Table 1) Limit Pipe length
Longest
pipe
length(L)
Outdoor Unit
Max pipe
↔
length
Equivalent
Indoor Unit
pipe length
Total pipe
length
Outdoor Unit
Difference in
Max
↔ Indoor Unit
height(H)
difference
in height
Indoor Unit
Difference in
↔ Indoor Unit
height(h)
Longest pipe
Pipe
length after
length(l)
1st branch
h * : See Table 4
WARNING
!
Increased Pipe Diameter(table 2)
- When pipe length is 90m or more from ODU to 1st branch
- When level difference is 50m or more
(Table 2) Refrigerant pipe diameter from outdoor unit to first branch. (A)
Upward
Standard Pipe
Outdoor unit
Diameter
total capacity
more from ODU to 1st branch
Liquid pipe
Gas pipe
HP
[mm(inch)]
[mm(inch)]
8
Ø 9.52(3/8)
Ø 19.05(3/4)
10
Ø 9.52(3/8)
Ø 22.2(7/8)
12 ~ 14
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
16
Ø 12.7(1/2) Ø 28.58(1-1/8) Ø 15.88(5/8) Ø 31.8(1-1/4) 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 31.8(1-1/4) Ø 19.05(3/4) not increased
24
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
Ø 19.05(3/4) Ø 34.9(1-3/8)
36 ~ 60
Ø 19.05(3/4) Ø 41.3(1-5/8)
62 ~ 64
Ø 22.2(7/8)
Ø 44.5(1-3/4)
66 ~ 80
Ø 22.2(7/8) Ø 53.98(2-1/8)
(Table 3) Refrigerant pipe diameter from first branch to last branch (B,C,D)
Downward Indoor Unit
Liquid pipe [mm(inch)]
total capacity [kW(Btu/h)]
≤ 5.6(19,100)
Ø6.35(1/4)
< 16.0(54,600)
Ø9.52(3/8)
≤ 22.4(76,400)
Ø9.52(3/8)
< 33.6(114,700)
Ø9.52(3/8)
< 50.4(172,000)
Ø12.7(1/2)
< 67.2(229,400)
Ø15.88(5/8)
< 72.8(248.500)
Ø15.88(5/8)
< 100.8(344,000)
Ø19.05(3/4)
< 173.6(592,500)
Ø19.05(3/4)
< 184.8(630,700)
Ø22.2(7/8)
< 224.0(764,400)
Ø22.2(7/8)
Combination of Y
Y branch
Header
branch/header
Method
Method
Method
A+B+b≤150 m
A+B+C+D+e≤150 m
A+C+e≤150 m
(200 m: Conditional
A+f≤200 m
(200 m: Conditional
application)*
application)*
175 m
175 m
(225 m: Conditional
(225 m: Conditional
application)*
application)*
1,000 m
1,000 m
1,000 m
110 m
110 m
40 m
40 m
40 m
40 m
(90 m: Conditional
(90 m: Conditional ap-
application)*
plication)*
Increased Pipe Diameter
When pipe length is 90m or
When level difference is
50m or more
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
[mm(inch)]
[mm(inch)]
[mm(inch)]
[mm(inch)]
Ø 12.7(1/2)
Ø 22.2(7/8)
Ø 12.7(1/2)
not increased
Ø 12.7(1/2)
Ø 25.4(1)
Ø 12.7(1/2)
not increased
Ø 22.2(7/8)
Ø 38.1(1-1/2)
Ø 22.2(7/8)
not increased
Ø 22.2(7/8)
not increased
Ø 22.2(7/8)
not increased
Ø 25.4(1)
Ø 53.98(2-1/8)
Ø 25.4(1)
not increased
Ø 25.4(1)
not increased
Ø 25.4(1)
not increased
Gas pipe [mm(inch)]
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
Ø28.58(1-1/8 )
Ø28.58(1-1/8 )
Ø34.9(1-3/8)
Ø34.9(1-3/8)
Ø41.3(1-5/8)
Ø44.5(1-3/4)
Ø53.98(2-1/8)
225 m
110 m
40 m
40 m
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