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28 Outside Unit
B
elow
2m(6.6ft)
Master
Slave
Indoor unit
direction
Below 10m
L Below 150m(492ft)
Below H 50m(164ft)
l
Below 40m(131ft)
Below 15m(49ft)
Ú
Slave 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)*)
2. When installing 2 outside units
Ex) 5 indoor units connected
Ⓐ : Outside units
Ⓑ : 1st branch
Ⓒ : Indoor units
Ⓓ : Indoor unit direction
Ⓔ : Connecting branch pipe between out-
side units
h Connecting branch pipe between outside
units: ARRCN20(ⓔ)
For the first branch pipe (B), use the branch pipe
that fits the main pipe diameter (A).
Refrigerant piping system
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)
Outside unit capacity Liquid pipe[mm(inch)] Gas pipe [mm(inch)]
24,30HP Ø19.05(3/4) Ø34.9(1-3/8)
32,40HP Ø19.05(3/4) Ø41.3(1-5/8)
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
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)]
• 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
24,30HP..................................................................Ø37.9 ’ Ø38.1(1-1/2) 24,30,32,40HP
...................................................Ø
19.05(
3/4) ’ Ø22.2(7/8)
32,40HP............................................................Ø41.3(1-5/8)
(**) : Conditional application
(**) : Conditional application
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