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14
Header Method
Ⓐ : Outdoor Unit
10 m or
Ⓑ : Header
less
Ⓒ : Indoor Units
Ⓓ : Sealed piping
Ⓔ : Connection branch pipe
between Outdoor
units : ARCNN41
Ⓕ : Connection branch pipe
between Outdoor
units : ARCNN31
Ⓖ : Connection branch pipe
between Outdoor
units : ARCNN21
Pipe Connection Method between outdoor
unit/indoor unit
Master
L2
L3
E
Indoor
Unit
1st branch
Refrigerant pipe diameter from outdoor unit to first branch
l 40 m (131 ft)
h 40 m (131 ft)
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+ Slave 3)
F : Refrigerant pipe diameter for outdoor unit capacity
(Slave 2+ Slave 3)
G : Refrigerant pipe diameter for outdoor unit capacity(Slave 3)
WARNING
!
• Branch pipe can not be used after header.
• It is recommended that difference in length of the pipes
connected to the indoor units (a~f) is minimized. Performance
difference between indoor units may occur.
Level Difference
(Outdoor unit ↔ Outdoor unit)
Max length from first branch to
each outdoor unit (L1, L2, L3)
(Table 1) Limit Pipe length
Longest
pipe
length(L)
Outdoor Unit
Max pipe
↔
Equivalent
length
Indoor Unit
pipe length
Total pipe
length
Outdoor Unit
Difference in
Max
↔ Indoor Unit
height(H)
difference
Indoor Unit
Difference in
in height
↔ Indoor Unit
height(h)
Longest pipe
Pipe
length after
length(ℓ)
1st branch
h * : See Table 4
ODU Capacity
Slave3
Slave2
Master ≥ Slave 1 ≥Slave 2 ≥Slave 3
Slave1
Master
G
F
E
L 200 m [656 ft]
B
l 40 m [131 ft]
D
C
C
C
C
C
h 40 m (131 ft)
Slave1
Slave2
Slave3
H1
F
G
L1
5 m [16.4 ft]
Less than 10 m [32.8 ft]
(equivalent length of piping 13 m
[42.7 ft])
Combination of Y
Y branch
Header
branch/header
Method
Method
Method
A+B+C+D+e ≤ 150 m
A+B+b ≤ 150 m [492 ft]
A+C+e ≤ 150 m [492 ft]
A+f ≤ 200 m
[492 ft]
(200 m [656 ft] :
(200 m [656 ft] :
Conditional application)*
Conditional application)*
175 m [574 ft]
175 m [574 ft]
(225 m [738 ft] :
(225 m [738 ft] :
Conditional application)*
Conditional application)*
1000 m [3281 ft]
1000 m [3281 ft]
110 m [361 ft]
110 m [361 ft]
110 m [361 ft]
40 m [131 ft]
40 m [131 ft]
40 m [131 ft]
40 m [131 ft]
40 m [131 ft]
(90 m [295 ft] :
(90 m [295 ft] :
40 m [131 ft]
Conditional application)*
Conditional application)*
WARNING
!
Increased Pipe Diameter(table 2)
- When pipe length is 90 m [295 ft] or more from ODU to 1st
branch
- When level difference is 50 m [164 ft] or more
(Table 2) Refrigerant pipe diameter from outdoor unit to first branch. (A)
C
Pipe diameter when pipe
length is < 90 m (295 ft)
ODU
(Standard)
capacity
(hp)
Liquid 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
(Table 3) Refrigerant pipe diameter from first branch to last branch (B,C,D)
Downward indoor unit
total capacity [kW(Btu/h)]
≤ 5.6(19 100)
< 16.0 (54 600)
≤ 22.4 (76 400)
< 33.6 (114 700)
< 50.4 (172 000)
< 67.2 (229 400)
< 72.8(248 500)
< 100.8(344 000)
< 173.6(592 500)
< 184.8(630 700)
≤ 224.0(764 400)
(Table 4) Conditional Application
• To satisfy below condition to make 40 m ~ 90 m of pipe length after first branch.
Condition
Diameter of pipes
between first branch and
the last branch should be
1
increased by one step,
except pipe diameter
B,C,D is same as
Diameter A
While calculating whole
refrigerant pipe length, pipe
2
B,C,D length should be
[656 ft]
calculated twice.
Length of pipe from each
225 m
3
indoor unit to the closest
[738 ft]
branch
1000 m
Length of pipe from
[3281 ft]
outdoor unit to the
farthest indoor unit 5
4
(A+B+C+D+e)] - [Length
of pipe outdoor unit to the
closest indoor unit 1
(A+a)] ≤ 40 m [131 ft]
Pipe diameter when pipe
differential (ODU↔IDU) is > 50 m
length is ≥ 90 m (295 ft)
Gas Pipe
Liquid Pipe
Gas Pipe
Liquid Pipe
mm (inch)
mm (inch)
mm (inch)
mm (inch)
Liquid pipe
[mm(inch)]
Ø 6.35(1/4)
Ø 9.52(3/8)
Ø 9.52(3/8)
Ø 9.52(3/8)
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)
Example
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),
40 m [131 ft] <
Ø 15.88(5/8) ' Ø 19.05(3/4), Ø 19.05(3/4) '
B+C+D+e
Ø22.2(7/8), Ø 22.2(7/8) ' Ø 25.4(1),
90 m [295 ft] ' B, C, D
Ø 25.4(1) ' Ø 28.58(1-1/8), Ø 28.58(1-1/8) '
Change a diameter
Ø 31.8(1-1/4), Ø 31.8(1-1/4) ' Ø 34.9(1-3/8),
Ø 34.9(1-3/8) ' Ø3 8.1(1-1/2)
A+Bx2+Cx2+Dx2
+a+b+c+d+e ≤
1 000 m [3 281 ft]
a,b,c,d,e ≤ 40 m
[131 ft]
(A+B+C+D+e)-
(A+a) ≤ 40 m
h 40 m [131 ft]
[131 ft]
Pipe diameter when height
(164 ft)
Gas Pipe
mm (inch)
Gas pipe
[mm(inch)]
Ø 12.7(1/2)
Ø 15.88(5/8)
Ø 19.05(3/4)
Ø 22.2(7/8)
Ø 28.58(1-1/8)
Ø 28.58(1-1/8)
Ø 34.9(1-3/8)
Ø 34.9(1-3/8)
Ø 41.3(1-5/8)
Ø 44.5(1-3/4)
Ø 53.98(2-1/8)
Indoor
Unit
L
l
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