LG ARUB80LT2 Installation Manual page 31

➲ Refrigerant pipe diameter between branches and HR units (B,C,D)
Downward indoor unit total capacity
[kW(Btu/h)]
< 5.6 (19,100)
< 16.0 (54,600)
< 22.4 (76,400)
< 33 (112,600)
< 47 (160,400)
< 71 (242,300)
< 104 (354,900)
104 (354,900) ≤
➲ Total pipe length (A+B+C1+C2+C3+D+a+b+c+d+e+f+g+i+j+k) ≤ 1,000 m
Outdoor unit ~ the farthest indoor unit
~
E1 D10
A+B+C3+D+k ≤ 150m (equivalent pipe length ≤ 175m)
HR unit ~ neighboring HR unit
~
C3 C4
D ≤ 10 m
The 1st indoor branch ~ the farthest indoor unit
~
B1 D10
B+C3+D+k ≤ 40m
The 1st outdoor branch ~ the farthest outdoor unit
~
E1 A3
E+F3 ≤ 10m
Difference in height (outdoor unit ↔ indoor unit)
H
H ≤ 50m (40m:if outdoor unit is lower than indoor units)
Difference in height (indoor unit ↔ indoor unit)
h
h ≤ 15m
Prohibited pattern
HR1
1 2
48k 48k
• Capacity sum of indoor units is over 160kBtu/hr.
Pattern
1
Indoor unit
A
Low pressure Gas pipe
Outdoor
High pressure Gas pipe
Unit
Liquid pipe
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)
Ø19.05(3/4)
Ø19.05(3/4)
3 4
48k 48k
A
HR1
1 2
12k 24k
Y Branch pipe
Gas pipe
HR
Unit
Liquid pipe
Refrigerant piping installation
Gas pipe [mm(inch)]
Low pressure
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
1
Ø28.58(1
1
Ø28.58(1
3
Ø34.9(1 /
5
Ø41.3(1 /
• Should not be exceed 10m
• Serial connection of HR units :
Pattern
A
HR2
3 4 5 6 7
24k 12k 48k 48k 48k
Indoor
Unit
High pressure
Ø9.52(3/8)
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
/ ) Ø22.2(7/8)
8
1
/ ) Ø28.58(1 / )
8 8
1
) Ø28.58(1 / )
8 8
1
) Ø28.58(1 / )
8 8
CAUTION
• * : Assume equivalent pipe
length of Y branch to be 0.5m,
calculation purpose.
CAUTION:
between neighboring HR unit.
Capacity sum of indoor units ≤
160kBtu/hr.
HR1 HR2
1 2 3 4
36k 36k 36k 36k
8
12k
Installation Manual 31