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ENGLISH
Installation Manual 29
Refrigerant piping system
10m or
less
L150m(492ft)
l
40m(131ft)
Slave2
Slave1
Master
Below 2m(6.6ft)
(h1)
Indoor unit
direction
H 50m(164ft)
15m(49ft)
3. When installing 3 outside units
Ex) 5 Indoor Units connected
Ⓐ : Outside Units
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units
Ⓓ : Downward Indoor Unit
Ⓔ : Connection branch pipe between
Outside units:ARCNN30
Ⓕ : Connection branch pipe between
Outside units:ARCNN20
Ú
Slave1 outside unit ~ Connecting
branch pipe
Ⓔ
: Pipe diameter
between outside units (E)
Ú
Connecting branch pipe
Ⓔ
~ 1st branch
part
Ⓑ
: Main pipe diameter (A)
Ú
Refrigerant pipe diameter from branch
to branch (B, C, D)
Ú
Total refrigerant pipe length = A + B + C + D +
a + b + c + d + e ≤ 300m(984ft)(500m(1640ft)*)
For the first branch pipe (B), use the branch
pipe that fits the main pipe diameter (A).
Ú
Slave2 outside unit ~ Connecting
branch pipe
Ⓕ
: Pipe diameter
between outside units (F)
• When
the pipe diameter (B) connected after 1st branching is larger than the main pipe diameter (A), Install the pipe with the pipe diameter (B)
after 1st branching that is the same as the main pipe diameter (A).
Ex) When connecting with 120% of the indoor unit to 10 HP.
1) Outside unit main pipe diameter: Ø22.2(7/8) (Gas pipe) / Ø9.52(3/8)(Liquid pipe)
2) Pipe diameter after 1st branching by 120% indoor unit combination : Ø28.58(1-1/8) (Gas pipe) / Ø12.7(1/2) (Liquid pipe)
Therefore set the pipe diameter (B) after 1st branching to Ø22.2(7/8) (Gas pipe) / Ø9.52(3/8)(Liquid pipe) of main pipe diameter (A).
• When the pipe distance corresponding to the farthest indoor unit from the outside unit is 90m or above, you must change the main pipe diame-
ter according to the outside unit capacity in accordance with the following table. (This applies to both the liquid and gas pipes.)
Gas Pipe Liquid Pipe
40,48,50,60HP ............................................Ø41.3(1-5/8) 40,48,50,60HP ............................................Ø19.05(3/4) ’ Ø22.2(7/8)
Liquid pipe Gas pipe
Low/high pressure
[mm(inch)]
[mm(inch)]
common pipe
Ø9.52(3/8)/12.7(1/2)
Ø22.2(7/8)/28.58(1-1/8)
Ø19.05(3/4)
Liquid pipe Gas pipe Low/high pressure
[mm(inch)] [mm(inch)] common pipe
Ø15.88(5/8)/19.05(3/4)
Ø34.9(1-3/8)/41.3(1-5/8)
Ø19.05(3/4)
Longest pipe length Equivalent pipe length
A + B + C + D + e ≤ 150m(492ft)(200m(656ft)**) *A + B + C + D + e ≤ 175m(574ft)(225m(738ft)**)
Longest pipe length after 1st branching
B + C + D + e ≤ 40m(131ft) (90m(295ft)**)
High/Low difference (Outside unit ÷ Indoor unit)
H ≤ 50m(164ft)
High/Low difference (Indoor unit ÷ Indoor unit)
h ≤ 15m(49ft)
High/Low difference (Outside unit ÷ Outside unit)
h ≤ 2m(6.6ft)
L
ℓ
H
h
h1
Outside unit capacity
Liquid pipe[mm(inch)] Gas pipe [mm(inch)]
40,48,50,60HP Ø19.05(3/4) Ø41.3(1-5/8)
Total capacity of indoor units connected
to after branching [kW(Btu/h]
≤ 5.6(19,100) Ø6.35(1/4) Ø12.7(1/2)
<16(54,600) Ø9.52(3/8) Ø15.88(5/8)
≤ 22.4(76,400) Ø9.52(3/8) Ø19.05(3/4)
< 33(112,600) Ø9.52(3/8) Ø22.2(7/8)
< 47(160,400) Ø12.7(1/2) Ø28.58(1-1/8)
< 71(242,300) Ø15.88(5/8) Ø28.58(1-1/8)
< 104(354,900) Ø19.05(3/4) Ø34.9(1-3/8)
104(354,900) ≤ Ø19.05(3/4) Ø41.3(1-5/8)
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
tion
(**) : Conditional application
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