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ENGLISH
Installation Manual 35
Pipe connections between indoor and outdoor unit
Longest pipe length * Equivalent pipe length
A+f ≤ 656ft(200m) A+f ≤ 738ft(225m)
Longest pipe length after 1st branch
f ≤ 131ft(40m)
Difference in height(Outdoor Unit ÷ Indoor Unit)
H ≤ 361ft(110m)
Difference in height (Indoor Unit ÷ Indoor Unit)
h ≤ 49ft(15m)
Difference in height
(Outdoor Unit
÷
Outdoor Unit)
h1 ≤ 16ft(5m)
L
l
H
h
h1
Ú Total pipe length = A+a+b+c+d+e+f ≤ 3280.8ft(1000m)
WARNING
Pipe length after header branching
(a~f)
It is recommended that difference in
length of the pipes connected to the
Indoor Units is minimized.
Performance difference between
Indoor Units may occur.
• * :
Assume equivalent piping length of Y branch to be 1.6ft(0.5m), that of header to be 3.3ft(1m), calculation purpose
• It is recommended that indoor unit Is installed at lower position than the header.
• Piping length from outdoor branch to outdoor unit ≤ 33ft(10m), equivalent length : max 43ft(13m)
(for 12ton(14HP) or more)
Branch pipe can not be used after header
3 Outdoor Units
Example : 6 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : Header branch
Ⓒ : Indoor Units
Ⓓ : Sealing
Ⓔ : Connection branch pipe
between Outdoor units:
ARCNN31
Ⓕ : Connection branch pipe
between Outdoor units:
ARCNN21
33ft
(10m)
or less
H 361ft(110m)
49ft(15m)
L 656ft(200m)
131ft(40m)
Master
Slave2
Slave1
ODU Capacity
Master ≥ Slave1 ≥ Slave2
WARNING
If overall equivalent pipe length is greater than or equal to 295ft(90m) from ODU to the longest IDU,
The diameter of the main pipe (Gas and Liquid pipes) must be increased as follow.
Ú Refrigerant pipe diameter from outdoor unit to first branch. (A)
h If the step up size is not available, you can not select the next higher size available.
Outdoor unit
Total capacity
[kW (Btu/h)
Standard Pipe Diameter
Conditional application
(more than 90m from ODU to IDU)
Liquid pipe
[mm (inch)]
Gas pipe
[mm (inch)]
Liquid pipe
[mm (inch)]
Gas pipe
[mm (inch)]
16.0~22.4(54,600~76,400)
Φ9.52(3/8)
Φ19.05(3/4)
Φ12.7(1/2)
Φ22.2(7/8)
28.0(95,900)
Φ22.2(7/8) Φ25.4(1)
33.6~44.8(172,000~152,900)
Φ12.7(1/2)
Φ28.58(1 1/8)
Φ15.88(5/8)
Φ28.58(1 1/8)
50.4~61.6(172,000~210,600)
Φ15.88(5/8) Φ19.05(3/4)
Φ31.8(1 1/4)
67.2(229,400)
Φ34.9(1 3/8)
Φ34.9(1 3/8)
72.8~95.2(248,500~324,900)
Φ19.05(3/4) Φ22.2(7/8)
Φ38.1(1 1/2)
100.8~168.0(344,000~573,300)
Φ41.3(1 5/8) Φ41.3(1 5/8)
173.6~179.2(592,500~611,600)
Φ22.2(7/8)
Φ44.5(1 3/4)
Φ25.4(1)
Φ53.98(2)
184.8~224.0(630,700~764,400)
Φ53.98(2)
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