LG MULTI V 5 Engineering Manual page 93
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Also See for MULTI V 5:
- Service manual (236 pages) ,
- Data manual (162 pages) ,
- Manual book (133 pages)
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Following pages present Multi V 5 piping limitations and are for illustrative purposes only. Designers MUST use LATS when designing LG VRF systems.
Table 26: Refrigerant Pipe (B) Diameters between Y-branches and Y-branches / Heat Recovery Unit / Headers.
Downstream IDU total capacity
(Btu/h)
<54,600
<76,400
<114,700
<172,000
<229,400
<248.500
<344,000
<592,500
Table 27: Indoor Unit Connecting Pipe from Branch (C).
Indoor Unit Capacity
9,600-24,200 Btu/h 4-way 3 feet x 3 feet Cassette and 15,400-24,200 Btu/h High Static Ducted IDUs have 3/8Ø (liquid) and 5/8Ø (vapor).
1
Conditional Applications
Conditional applications are computed in LATS. See below for an explanation of when pipes are upsized.
If the equivalent length between the first Y-branch to the farthest indoor unit is >131 feet (maximum 295 feet):
• Pipe segment diameters between the first branch and the last branch must be sized up by one. This applies to both liquid and low / high
vapor pipes. If the next size up is not available, or if the pipe segment diameters are the same as main pipe (A) diameters, sizing up is not
possible.
• While calculating total refrigerant piping length, pipe (B) segment lengths between the first Y-branch and second Y-branch, and between the
second Y-branch and the heat recovery unit must be calculated by two.
•
•
feet.
For Systems Designed for Heat Recovery Operation
Liquid pipe (inches OD)
1/4Ø
3/8Ø
3/8Ø
3/8Ø
1/2Ø
5/8Ø
5/8Ø
3/4Ø
3/4Ø
Liquid pipe (inches OD)
1
©
PIPING LIMITATIONS
Vapor pipe (inches OD)
Low pressure
1/2Ø
5/8Ø
3/4Ø
7/8Ø
1-1/8Ø
1-1/8Ø
1-3/8Ø
1-3/8Ø
1-5/8Ø
1/4Ø
3/8Ø
3/8Ø
3/8Ø
High pressure
3/8Ø
1/2Ø
5/8Ø
3/4Ø
7/8Ø
7/8Ø
1-1/8Ø
1-1/8Ø
1-3/8Ø
Vapor pipe (inches OD)
1/2Ø
5/8Ø
3/4Ø
7/8Ø
LIMITS / PLACEMENT | 93
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