LG Multi V PRHR033 Installation Manual page 21

Series Outdoor Units (2 Units ~ 3 Units)
Y branch method
Ⓐ : Outdoor Unit
(33 ft)
Ⓑ : 1st branch (Y branch)
or less
Ⓒ : Indoor Units
Ⓓ : Downward Indoor Unit
Ⓔ : Connection branch
pipe between Outdoor
units : ARCNN31
Ⓕ : Connection branch
pipe between Outdoor
units : ARCNN21
Combination of Y branch/
header method
Ⓐ : Outdoor Unit
Ⓑ : 1st branch(Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Connection branch pipe
between Outdoor
units : ARCNN31
Ⓕ : Connection branch pipe
between Outdoor
units : ARCNN21
Ⓖ : Header
Ⓗ : Sealed piping
Header method
Ⓐ : Outdoor Unit
(33 ft)
Ⓑ : Header
or less
Ⓒ : Indoor Units
Ⓓ : Sealed piping
Ⓔ : 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
E
Indoor
Unit
1st branch
Refrigerant pipe diameter from outdoor unit to first branch
l 40 m(131 ft)
h 40 m(131 ft)
h See Table 2
ODU Capacity
Master ≥ Slave 1 ≥Slave 2
Slave2
Slave1
10 m
Master
L150m(492ft) (200m(656ft) : Conditional application)*
l 40m(131ft) (90m(295ft) : Conditional application)*
C
C C C
h 40m(131ft)
h * : See the Table 4
ODU Capacity
Master ≥ Slave 1 ≥Slave 2
Slave2
Slave1
Master
10 m
(33 ft)
or less
L150m(492ft) (200m(656ft) : Conditional application)*
l 40m(131ft) (90m(295ft) : Conditional application)*
h * : See the Table 4
Slave2
ODU Capacity
Slave1
Master ≥ Slave 1 ≥Slave 2
10 m
Master
L150 m(492 ft)
l 40 m(131 ft)
C
C
C C C
h 40 m(131 ft)
Slave1
Slave2
H1
F
L1
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)
Indoor
Unit
Level Difference (H1)
(Outdoor unit ÷ Outdoor unit)
Max length from first branch to
each outdoor unit (L1,L2,L3)
(Table 1) Limit Pipe length
Classification Section
Outdoor Unit
Max pipe
÷
length
Indoor Unit
H
Outdoor Unit
Max
÷ Indoor Unit
difference
Indoor Unit
in height
÷ Indoor Unit
Longest pipe
length after
1st branch
h * : See Table 4
WARNING
!
Increased Pipe Diameter (table 2)
- When pipe length is Over 40 m(131 ft) from 1st branch to longest
C
IDU.
(Table 2) Refrigerant pipe diameter from outdoor unit to first branch. (A)
Pipe diameter when pipe
Length is < 90 m (295 ft)
ODU
capacity
(HP(ton))
Liquid pipe
[mm(inch)]
8(6) Ø 9.52(3/8)
10(8) Ø 9.52(3/8)
12(10)~14(12) Ø 12.7(1/2)
20(16) Ø 15.88(5/8)
24(20) Ø 15.88(5/8)
28~34(24~28) Ø 19.05(3/4)
43~54(36~46) Ø 19.05(3/4)
5 m(16.4 ft)
Less than 10 m(35 ft)
[equivalent length of piping 13 m(43 ft)]
Type Y branch Y/header branch
A+B+b ≤150 m(492 ft)
A+B+C+D+e
Maximum
≤ 150 m(492 ft) A+C+e ≤150 m(492 ft)
pipe
(Conditionally 200 m (Conditionally 200 m
length(L)
(656 ft))* (656 ft))*
175 m(574 ft) 175 m(574 ft)
Equivalent
(Conditionally (Conditionally
pipe length
225 m(738 ft))* 225 m(738 ft))*
300 m(984 ft) 300 m(984 ft)
Total pipe
(Conditionally (Conditionally
length
500 m(1 640 ft))* 500 m(1 640 ft))*
Difference in
50 m(164 ft) 50 m(164 ft)
height(H)
Difference in
40 m(131 ft) 40 m(131 ft)
height(h)
40 m(131 ft) 40 m(131 ft)
Pipe
(Conditionally (Conditionally
length(l)
90 m(295 ft))* 90 m(295 ft))*
Pipe diameter when pipe
length (ODU ÷ IDU)
is ≥ 90 m (295 ft)
(Standard)
Vapor pipe Liquid pipe
[mm(inch)] [mm(inch)]
Ø 19.05(3/4) Ø 12.7(1/2)
Ø 22.2(7/8) Ø 12.7(1/2)
Ø 28.58(1-1/8) Ø 15.88(5/8)
Ø 28.58(1-1/8) Ø 19.05(3/4)
Ø 34.9(1-3/8) Ø 19.05(3/4)
Ø 34.9(1-3/8) Ø 22.2(7/8)
Ø 41.3(1-5/8) Ø 22.2(7/8)
21
Header
branch
A+f ≤
150 m(492 ft)
175 m (574 ft)
300 m(984 ft)
(Conditionally
500 m(1 640 ft))*
50 m(164 ft)
40 m(131 ft)
40 m(131 ft)
Vapor pipe
[mm(inch)]
Ø 22.2(7/8)
Ø 28.58(1-1/8)
Not increased
Ø 31.8(1-1/4)
Not increased
Ø 38.1(1-1/2)
Not increased