21
ENGLISH
Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units
Ⓔ : Connection branch
pipe between Outdoor
units: ARCNN31
Ⓕ : Connection branch
pipe between Outdoor
units: ARCNN21
Y branch method
10 m
(323 ft)
or less
L150 m(492 ft) (200 m(656 ft) : Conditional application)
ODU Capacity
Master ≥ Slave1 ≥ Slave 2
l
40 m(131 ft) (90 m(295 ft) : Conditional application)
H 361 ft(110 m)
40 m(131 ft)
Slave2
Slave1
Master
h * : See Table 4
Combination of Y branch/
header Method
Ⓐ : Outdoor Unit
Ⓑ : 1st branch(Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Connection branch pipe
between Outdoor units:
ARCNN31
Ⓕ : Connection branch pipe
between Outdoor units:
ARCNN21
Ⓖ : Header
Ⓗ : Sealed piping
H 110 m(361 ft)
Master
Slave2
Slave1
F
E
ODU Capacity
Master ≥ Slave1 ≥ Slave2
40 m(131 ft)
h1
10 m
(33 ft)
or less
L 150 m(492 ft)(200 m(656 ft) : Conditional application)
40 m(131 ft)(90 m(295 ft) : Conditional application)
h * : See Table 4
Pipe Connection Method between outdoor
unit/indoor unit
Header Method
Ⓐ : Outdoor Unit
Ⓑ : Header branch
Ⓒ : Indoor Units
Ⓓ : Sealed piping
Ⓔ : Connection branch pipe
between Outdoor units:
ARCNN31
Ⓕ : Connection branch pipe
between Outdoor units:
ARCNN21
10 m
(33 ft)
or less
H 110 m(361 ft)
40 m(131 ft)
L 200 m(656 ft)
40 m(131 ft)
Master
Slave2
Slave1
ODU Capacity
Master ≥ Slave1 ≥ Slave2
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)
L1
L2
L3
H1
E F
Slave2
Slave1
Master
l 40m (131ft)
h 40 m (131 ft)
Indoor
Unit
1st branch
Refrigerant pipe diameter from outdoor unit to first branch
Level Difference
(Outdoor unit ↔ Outdoor unit)
5 m [16.4 ft]
Max length from first branch to
each outdoor unit (L1, L2, L3)
Less than 10 m [32.8 ft]
(equivalent length of piping 13 m
[42.7 ft])
h * : See Table 4
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
Y branch
Method
Combination of Y
branch/header
Method
Header
Method
Max pipe
length
Outdoor Unit
↔
Indoor Unit
Longest
pipe length(L)
A+B+C+D+e ≤
150 m [492 ft]
(200 m [656 ft] :
Conditional
application)*
A+B+b ≤ 150 m
[492 ft]
A+C+e ≤ 150 m
[492 ft]
(200 m [656 ft] :
Conditional
application)*
A+f ≤ 200 m
[656 ft]
Equivalent
pipe length
175 m [574 ft]
(225 m [738 ft] :
Conditional
application)*
175 m [574 ft]
(225 m [738 ft] :
Conditional
application)*
225 m
[738 ft]
Total pipe
length
1 000 m
[3 281 ft]
1 000 m [3 281 ft]
1 000 m
[3 281 ft]
Max
difference
in height
Outdoor Unit
↔ Indoor Unit
Difference
in height(H)
110 m [361 ft] 110 m [361 ft]
110 m
[361 ft]
Indoor Unit
↔ Indoor Unit
Difference
in height(h)
40 m [131 ft] 40 m [131 ft]
40 m
[131 ft]
Longest
pipe length
after
1st branch
Pipe length(l)
40 m [131 ft]
(90 m [295 ft] :
Conditional
application)*
40 m [131 ft]
(90 m [295 ft] :
Conditional
application)*
40 m
[131 ft]
(Table 1) Limit Pipe length
Series Outdoor Units (2 Units ~ 3 Units)
Piping length from outdoor branch to outdoor unit ≤ 10 m(33 ft),
equivalent length : max 13 m(43 ft) (for 14 Ton or more)
Additional Application
To satisfy below condition to make 40 m(131 ft) ~ 90 m(295 ft) of
pipe length after first branch.
• 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
Ø 1/4(6.35 mm) ’ Ø 3/8(9.52 mm) ’ Ø 1/2(12.7 mm) ’
Ø 5/8(15.88 mm) ’ Ø 3/4(19.05 mm) ’ Ø 7/8(22.2 mm) ’
Ø 1(25.4)*, Ø 1-1/8(28.58 mm) ’ Ø 1-1/4(31.8 mm)*,
Ø 1-3/8(34.9 mm) ’ Ø 1-1/2(38.1 mm)* ’ Ø 1-5/8(41.3 mm)
* : It is not necessary to size up.
h If the step up size is not available, you can not select the next
higher size available.
•
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)
• Length of pipe from each indoor unit to the closest branch
(a,b,c,d,e) ≤ 40 m(131 ft)
• [Length of pipe from outdoor unit to the farthest indoor unit 5
(A+B+C+D+e)]
- [Length of pipe from outdoor unit to the closest indoor unit 1
(A+a)] ≤ 40 m(131 ft)
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