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12
ENGLISH
h * : See Table 4
Classifica-
tion
Section Type Y branch
Y/header branch
Header
branch
Max pipe
length
Outside Unit
÷
Indoor Unit
Maximum
pipe
length(L)
A+B+C+D+e
≤
150m(492ft) (Condi-
tionally 200m(656ft))*
A+B+b
≤
150m(492ft)
A+C+e
≤
150m(492ft)
(Conditionally
200m(656ft))*
A+f
≤
150m(492ft)
Equivalent
pipe length
175m(574ft)
(Conditionally
225m(738ft))*
175m(574ft)
(Conditionally
225m(738ft))*
175m(574ft)
Total pipe
length
300m(984ft)
(Conditionally
500m(1640ft))*
300m(984ft)
(Conditionally
500m(1640ft))*
300m(984ft)
(Conditionally
500m(1640ft))*
Max
difference
in height
Outside Unit
÷ Indoor Unit
Difference in
height(H)
50m(164ft) 50m(164ft)
50m(164ft)
Indoor Unit
÷ Indoor Unit
Difference in
height(h)
40m(131ft) 40m(131ft)
40m(131ft)
Longest pipe
length after
1st branch
Pipe
length(l)
40m(131ft)
(Conditionally
90m(295ft))*
40m(131ft)
(Conditionally
90m(295ft))*
40m(131ft)
( Table 1 ) Limit Pipe length
WARNING
Increased Pipe Diameter(table 2)
- When pipe length is Over 40m(131ft) from 1st branch to longest IDU.
!
Y branch method
Combination of Y
branch/header method
Header method
Ⓐ : Outside Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units
Ⓓ : Downward Indoor Unit
Ⓐ : Outside Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Header
Ⓕ : Sealed piping
Ⓐ : Outside Unit
Ⓑ : 1st branch
Ⓒ : Indoor Units
Ⓓ : Sealed piping
Ⓔ : Header
Ⓐ : Outside Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units
Ⓓ : Downward Indoor Unit
Ⓔ : Connection branch
pipe between Outside
units : ARCNN31
Ⓕ : Connection branch
pipe between Outside
units : ARCNN21
l 150m(492ft) (200m(656ft) : Conditional application)*
h 40m(131ft)
H 50m(164ft)
L150m(492ft) (200m(656ft) : Conditional application)*
Indoor
Unit
l 150m(492ft) (200m(656ft) : Conditional application)*
h 40m(131ft)
H 50m(164ft)
L150m(492ft) (200m(656ft) : Conditional application)*
l 40m(131ft)
h 40m(131ft)
H 50m(164ft)
L 50m(164ft)
PIPE CONNECTIONS BETWEEN INDOOR
AND OUTSIDE UNIT
Refrigerant piping system
1 Outside Unit
Y branch method
Combination of Y branch/
header method
Ⓐ : Outside Unit
Ⓑ : 1st branch(Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Connection branch pipe
between Outside units :
ARCNN31
Ⓕ : Connection branch pipe
between Outside units :
ARCNN21
Ⓖ : Header
Ⓗ : Sealed piping
Slave2
Slave1
Master
Indoor
Unit
l 40m(131ft) (90m(295ft) : Conditional application)*
H 50m(164ft)
L150m(492ft) (200m(656ft) : Conditional application)*
h 40m(131ft)
10m or
less
ODU Capacity
Master ≥ Slave 1 ≥Slave 2
C
C
CC
l 40m(131ft) (90m(295ft) : Conditional application)*
L150m(492ft) (200m(656ft) : Conditional application)*
h 40m(131ft)
ODU Capacity
Master ≥ Slave 1 ≥Slave 2
H
Slave2
Slave1
Master
H 50m(164ft)
10m or
less
Series Outside Units (2 Units ~ 4 Units)
h * : See the Table 4
h * : See the Table 4
h * : See the Table 4
h * : See the Table 4
Header method
Ⓐ : Outside Unit
Ⓑ : Header
Ⓒ : Indoor Units
Ⓓ : Sealed piping
Ⓔ : Connection branch pipe
between Outside units :
ARCNN31
Ⓕ : Connection branch pipe
between Outside units :
ARCNN21
Slave2
Slave1
Master
l 40m(131ft)
H 50m(164ft)
L150m(492ft)
h 40m(131ft)
10m or
less
ODU Capacity
Master ≥ Slave 1 ≥Slave 2
C
C
C C C
C
Pipe Connection Method between outside unit
/indoor unit
h See Table 2
A : Refrigerant pipe diameter from outside unit to first branch
E : Refrigerant pipe diameter for outside unit capacity
(Slave 1+ Slave 2)
F : Refrigerant pipe diameter for outside unit capacity
(Slave 2)
L1
L2
L3
H1
E F
Slave2
Slave1
Master
l 40m
h 40m
Indoor
Unit
1st branch
Refrigerant pipe diameter from outside unit to first branch
Level Difference (H1)
(Outside unit ÷ Outside unit)
2m(6.6ft)
Max length from first branch to
each outside unit (L1,L2,L3)
Less than 10m(35ft)
[equivalent length of piping 13m(43ft)]
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