Pipe Connection Method Between Outdoor Unit/Indoor Unit - LG ARUN BTE4 Series Installation Manual

12
Header Method
Ⓐ : Outdoor Unit
Ⓑ : Header branch
10m or
Ⓒ : Indoor Units
Ⓓ : Sealing
Ⓔ : Connection branch pipe
between Outdoor units:
ARCNN31
Ⓕ : Connection branch pipe
between Outdoor units:
ARCNN21
Pipe Connection Method between outdoor
unit/indoor unit
Master
L2
L3
Indoor
Unit
1st branch
l 40m
h 40m
h See Table 2
A : Refrigerant pipe diameter from outdoor unit to first branch
E : Refrigerant pipe diameter for outdoor unit capacity
(Slave 1+ Slave 2)
F : Refrigerant pipe diameter for outdoor unit capacity
(Slave 2)
Level Difference
(Outdoor unit ↔ Outdoor unit)
Max length from first branch to
each outdoor unit (L1, L2, L3)
(Table 1) Limit Pipe length
Longest
pipe
length(L)
Outdoor Unit
Max pipe
↔
length
Equivalent
Indoor Unit pipe length
Total pipe
length
Outdoor Unit
Difference in
Max
↔ Indoor Unit
height(H)
difference
in height
Indoor Unit Difference in
↔ Indoor Unit
height(h)
Longest pipe
Pipe
length after
length(l)
1st branch
h * : See Table 4
! WARNING
Increased Pipe Diameter(table 2)
- When pipe length is 90m or more from ODU to 1st branch
- When level difference is 50m or more
ODU Capacity
Master ≥ Slave 1 ≥Slave 2 ≥Slave 3
Slave2
Slave1
Slave2
Master
Slave1
less
Master
L200m
B l 40m
D
C C
C C C
h 40m
Slave1
Slave2
H1
L1
Refrigerant pipe diameter from outdoor unit to first branch
5m
Less than 10m
(equivalent length of piping 13m)
Combination of Y
Y branch
Header
branch/header
Method
Method
Method
A+B+b≤150 m
A+B+C+D+e≤150 m
A+C+e≤150 m
(200 m: Conditional A+f≤200 m
(200 m: Conditional
application)*
application)*
175 m 175 m
(225 m: Conditional (225 m: Conditional
application)* application)*
1,000 m 1,000 m 1,000 m
110 m 110 m
40 m 40 m
40 m 40 m
(90 m: Conditional (90 m: Conditional ap-
application)* plication)*
(Table 2) Refrigerant pipe diameter from outdoor unit to first branch. (A)
Upward
Standard Pipe
Outdoor unit
Diameter
total capacity
Liquid pipe
HP
[mm(inch)]
8 Ø 9.52(3/8) Ø 19.05(3/4) Ø 12.7(1/2)
10 Ø 9.52(3/8)
12 ~ 14 Ø 12.7(1/2) Ø 28.58(1-1/8) Ø 15.88(5/8) not increased Ø 15.88(5/8) not increased
C
16 Ø 12.7(1/2) Ø 28.58(1-1/8) Ø 15.88(5/8) Ø 31.8(1-1/4) Ø 15.88(5/8) not increased
18 ~ 22 Ø 15.88(5/8) Ø 28.58(1-1/8) Ø 19.05(3/4) Ø 31.8(1-1/4) Ø 19.05(3/4) not increased
24 Ø 15.88(5/8) Ø 34.9(1-3/8) Ø 19.05(3/4) not increased Ø 19.05(3/4) not increased
26 ~ 34 Ø 19.05(3/4) Ø 34.9(1-3/8) Ø 22.2(7/8) Ø 38.1(1-1/2) Ø 22.2(7/8) not increased
36 ~ 60 Ø 19.05(3/4) Ø 41.3(1-5/8) Ø 22.2(7/8) not increased Ø 22.2(7/8) not increased
(Table 3) Refrigerant pipe diameter from first branch to last branch (B,C,D)
Downward indoor unit
total capacity [kW(Btu/h)]
≤ 5.6(19,100)
< 16.0 (54,600)
≤ 22.4 (76,400)
< 33.6 (114,700)
< 50.4 (172,000)
< 67.2 (229,400)
< 72.8(248,500)
< 100.8(344,000)
< 173.6(592,500)
(Table 4) Conditional Application
• To satisfy below condition to make 40 m ~ 90 m of pipe length after first branch.
Condition
Diameter of pipes be-
tween first branch and the
last branch should be in-
1
creased by one step, ex-
cept pipe diameter B,C,D
is same as Diameter A
While calculating whole re-
frigerant pipe length, pipe
2
B,C,D length should be cal-
culated twice.
Length of pipe from each
3 indoor unit to the closest
branch
Length of pipe from out-
door unit to the farthest
indoor unit 5
4 (A+B+C+D+e)] - [Length
of pipe outdoor unit to the
225 m
closest indoor unit 1
(A+a)] ≤ 40 m
110 m
WARNING
!
40 m
• In case of pipe diameter B connected after first branch is bigger than
the main pipe diameter A, B should be of the same size with A.
Ex) In case indoor unit combination ratio 120% is connected to
40 m
24HP(67.2 kW) outdoor unit.
1) Outdoor unit main pipe diameter A : Ø34.9(Gas pipe),
Ø15.88(liquid pipe)
2) Pipe diameter B after first branch according to 120% indoor
unit ombination(80.6kW) : Ø34.9(gas pipe), Ø19.05(liquid pipe)
Therefore, pipe diameter B connected after first branch
would be Ø34.9(gas pipe) / Ø15.88(liquid pipe) which is
same with main pipe diameter.
Increased Pipe Diameter
When equivalent pipe length is 90m When level difference is
or more from ODU to farthest IDU
Gas pipe Liquid pipe Gas pipe Liquid pipe
[mm(inch)] [mm(inch)] [mm(inch)] [mm(inch)]
Ø 22.2(7/8) Ø 12.7(1/2) not increased
Ø 22.2(7/8) Ø 12.7(1/2) Ø 25.4(1) Ø 12.7(1/2) not increased
Liquid pipe
[mm(inch)]
Ø6.35(1/4)
Ø9.52(3/8)
Ø9.52(3/8)
Ø9.52(3/8)
Ø12.7(1/2)
Ø15.88(5/8)
Ø15.88(5/8)
Ø19.05(3/4)
Ø19.05(3/4)
Example
Ø6.35 ' Ø9.52,
Ø12.7 ' Ø15.88, Ø15.88 ' Ø19.05,
40 m‹B+C+D+e≤90 m
' B, C, D Change a Ø19.05' Ø22.2,
Ø25.4 ' Ø28.58, Ø28.58 ' Ø31.8,
diameter
Ø31.8 ' Ø34.9,
A+Bx2+Cx2+Dx2
+a+b+c+d+e ≤
1 000 m
a,b,c,d,e ≤ 40 m
(A+B+C+D+e)-
h 40m
(A+a) ≤ 40 m
50m or more
Gas pipe
[mm(inch)]
Gas pipe
[mm(inch)]
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
Ø28.58(1-1/8)
Ø28.58(1-1/8)
Ø34.9(1-3/8)
Ø34.9(1-3/8)
Ø41.3(1-5/8)
Ø9.52 ' Ø12.7,
Ø22.2 ' Ø25.4,
Ø34.9 ' Ø38.1
Indoor
Unit
L
l