Installation Manual 35
ENGLISH
Refrigerant piping system
Branch pipe can not be used after header
3. When installing 3 outside units
Ex) 5 Indoor Units connected
Ⓐ : Outside Units
Ⓑ : 1st branch(Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ :
Connection branch pipe between Outside
units:ARCNN30
Ⓕ :
Connection branch pipe between Outside
units:ARCNN20
Ⓖ : Header
Ⓗ : Sealing
Ú
Slave1 outside unit ~ Connecting
branch pipe
Ⓔ
: Pipe diameter
between outside units (E)
Ú
Connecting branch pipe
Ⓔ
~ 1st Y
branch part
Ⓑ
: Main pipe diameter (A)
Ú
Refrigerant pipe diameter from branch
to branch (B, C)
Ú
Total refrigerant pipe length =
A + B + C + a + b + c + d + e ≤
300m(984ft)
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)
Total capacity of indoor units con-
nected 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)]
Outside unit capacity Liquid pipe[mm(inch)] Gas pipe [mm(inch)]
40,48,50,60HP Ø19.05(3/4) Ø41.3(1-5/8)
Longest pipe length (Equivalent pipe length)
A +B +b,A +C +e ≤ 150m(492ft)( 175m(574ft))
Longest pipe length after 1st branching
B +b,C +e ≤ 40m(131ft)
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
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)
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)
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