Y/Header Branch Method - LG ARWN Serie Manual De Instalación

Y/Header branch method

1. When installing 1 outside unit indepen-
dently
Ex) 5 indoor units connected
Ⓐ : Outside unit
Ⓑ : 1st Y branch
Ⓒ : 2nd Y branch
Ⓓ : Indoor unit
Ⓔ : Header branch
Ⓕ : Seal
Ú Outside unit Ⓐ ~ 1st Y branch
part Ⓑ : Main pipe diameter (A)
Outside unit Liquid pipe
capacity [mm(inch)]
8 HP Ø9.52(3/8)
10 HP Ø9.52(3/8)
16 HP Ø12.7(1/2)
20 HP Ø12.7(1/2)
Ú Refrigerant pipe diameter from branch
to branch (B, C)
Total capacity of indoor units con-
nected to after branching[kW(Btu/h]
≤ 5.6(19,100)
<16(54,600)
≤ 22.4(76,400)
< 33(112,600)
< 47(160,400)
< 71(242,300)
< 104(354,900)
104(354,900) ≤
* For the first branch pipe (B), use the branch pipe
that fits the main pipe diameter (A)
• 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) /Ø 9.52(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).
• For the pipe length after the header branch (c~e), it is recommended to install the unit so that the difference of the pipe distance connected to
the indoor unit is minimized.
• The large difference in pipe distance can cause performance difference between indoor units.
• After the header branch, you cannot use the Y branch and header branch.
• When the pipe distance corresponding to the farthest indoor unit from the outside unit is 90m(295ft) or above, you must change the main pipe
diameter according to the outside unit capacity in accordance with the following table.
(This applies to both the liquid and gas pipes.)
Gas Pipe
8, 10 HP.........................................................................Ø22.2(7/8) ' Ø25.4(1)
16, 20 HP.......................................................................Ø28.58(1-1/8) ' Ø31.8(1-1/4)
Gas pipe
[mm(inch)]
Ø22.2(7/8)
Ø22.2(7/8)
Ø28.58(1-1/8)
Ø28.58(1-1/8)
Liquid pipe Gas pipe
[mm(inch)] [mm(inch)]
Ø6.35(1/4) Ø12.7(1/2)
Ø9.52(3/8) Ø15.88(5/8)
Ø9.52(3/8) Ø19.05(3/4)
Ø9.52(3/8) Ø22.2(7/8)
Ø12.7(1/2) Ø28.58(1-1/8)
Ø15.88(5/8) Ø28.58(1-1/8)
Ø19.05(3/4) Ø34.9(1-3/8)
Ø19.05(3/4) Ø41.3(1-5/8)
8, 10 HP.........................................................................Ø9.52(3/8) ' Ø12.7(1/2)
16, 20 HP.......................................................................Ø12.7(1/2) ' Ø15.88(5/8)
Refrigerant piping system
Ú Total pipe length
=A +B +C +a +b +c +d +e ≤ 300m(984ft)
Longest pipe length (Equivalent pipe length)
L
A +B +b,A +C +e ≤ 150m(492ft)( 175m(574ft))
Longest pipe length after 1st branching
ℓ
B +b,C +e ≤ 40m(131ft)
High/Low difference (Outside unit ÷ Indoor unit)
H
H ≤ 50m(164ft)
High/Low difference (Indoor unit ÷ Indoor unit)
h
h ≤ 15m(49ft)
Liquid Pipe
L Below 150m(492ft)
l Below 40m(131ft)
Installation Manual 33