LG MULTI V WATER 5 ARW Series Engineering Manual page 74

PIPING LIMITATIONS
For Systems Designed for Heat Recovery Operation
Following pages present Multi V Water 5 piping limitations and are for illustrative purposes only. Designers MUST use LATS when designing LG VRF
systems.
Table 27: Main Pipe (A) Diameter from Water Source Unit to First Y-branch.
Pipe diameter when equivalent pipe length
WSU
from WSU to farthest IDU is <295 ft.
Capacity
Liquid Pipe
(ton)
(inches OD)
6 3/8
8 3/8
10 1/2
12 1/2
14 1/2
16 1/2
18 3/4
20 3/4
24 3/4
28 3/4
30 3/4
32 3/4
36 3/4
40 3/4
48 3/4
Table 28: Refrigerant Pipe (B) Diameter between Y-branches and Y-branches / Heat Recovery Unit / Headers.
Downstream IDU total capacity (Btu/h)
≤19,100
<54,600
<76,400
<112,600
<160,400
<242,300
<354,900
≥354,900
Table 29: Indoor Unit Connecting Pipe from Branch (C).
Indoor Unit Capacity
≤19,100
≤54,600
≤76,400
74 | LIMITS / PL ACEMENT
Low Pressure Vapor High Pressure Vapor
Pipe (inches OD) Pipe (inches OD)
7/8
7/8
1-1/8
1-1/8
1-1/8
1-1/8
1-3/8
1-3/8
1-3/8
1-3/8
1-5/8
1-5/8
1-5/8
1-5/8
1-5/8
Liquid pipe (inches OD)
1/4
3/8
3/8
3/8
1/2
5/8
3/4
3/4
Liquid pipe (inches OD)
1
1/4
3/8
3/8
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Pipe diameter when equivalent pipe length
from WSU to farthest IDU is >295 ft.
Liquid Pipe
(inches OD)
3/4 1/2
3/4 1/2
3/4 5/8
3/4 5/8
3/4 5/8
3/4 5/8
1-1/8 7/8
1-1/8 7/8
1-1/8 7/8
1-1/8 7/8
1-3/8 7/8
1-3/8 7/8
1-3/8 7/8
1-3/8 7/8
1-3/8 7/8
Low pressure
1-1/8
1-1/8
1-3/8
1-5/8
Vapor pipe (inches OD)
Low Pressure Vapor High Pressure Vapor
Pipe (inches OD) Pipe (inches OD)
7/8
1-1/8
1-1/8
1-1/8
1-1/8
1-1/8
1-3/8
1-3/8
1-3/8
1-3/8
1-5/8
1-5/8
1-5/8
1-5/8
1-5/8
Vapor pipe (inches OD)
High pressure
1/2
5/8
3/4
7/8
1/2
5/8
3/4
3/4
3/4
3/4
3/4
3/4
3/4
1-1/8
1-1/8
1-1/8
1-1/8
1-3/8
1-3/8
1-3/8
1-3/8
1-3/8
3/8
1/2
5/8
3/4
7/8
1-1/8
1-1/8
1-3/8