LG MULTI V 5 Engineering Manual page 89
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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.
Example of Pipe Sizing When Installing a Heat Pump System
Example: Five (5) indoor Units Connected
ODU: Outdoor Units.
IDU: Indoor Units.
A: Main Pipe from Outdoor Unit to Y-branch.
B: Y-branch to Y-branch.
C: Y-branch to Indoor Unit.
• Always reference the LATS Multi V software report.
• Larger-capacity outdoor units must be the master in a multi-frame system.
• Master outdoor unit capacity must be greater than or equal to the slave1 outdoor unit capacity, and, where applicable, slave1 outdoor unit
capacity must be greater than or equal to the slave2 outdoor unit capacity.
• Connection piping from branch to branch cannot exceed the main pipe diameter (A) used by the outdoor unit.
• Install the header branches so that the pipe distances between the between the connected indoor units are minimized. Large differences in
pipe distances can cause indoor unit performances to fluctuate.
•
Y-branches and other header branches cannot be installed downstream of the initial header branch.
Table 21: Main Pipe (A) Diameters from Outdoor Unit to First Y-branch / Header Branch.
Pipe diameter when pipe length is
ODU Capacity (ton)
Liquid pipe (inches
OD)
6
3/8Ø
8
3/8Ø
10-12
1/2Ø
14-18
5/8Ø
20
5/8Ø
22-28
3/4Ø
30-42
3/4Ø
<295 feet (Standard)
Vapor pipe (inches
OD)
3/4Ø
7/8Ø
1-1/8Ø
1-1/8Ø
1-3/8Ø
1-3/8Ø
1-5/8Ø
©
PIPING LIMITATIONS
For Systems Designed for Heat Pump Operation
Slave 2 ODU
Slave 1 ODU
Master ODU
To Outdoor Units
Length: 492 feet (656 feet conditional application)
Y-Branch
IDU
Elevation2:
Pipe diameter when pipe length is
Liquid pipe (inches
Vapor pipe (inches
OD)
OD)
1/2Ø
7/8Ø
1/2Ø
1-1/8Ø
5/8Ø
No Increase
3/4Ø
No Increase
3/4Ø
No Increase
7/8Ø
No Increase
7/8Ø
No Increase
Y-Branch
To Indoor Units
IDU
IDU
IDU
Pipe diameter when height differential
Liquid pipe (inches
Vapor pipe (inches
OD
1/2Ø
1/2Ø
5/8Ø
3/4Ø
3/4Ø
7/8Ø
7/8Ø
LIMITS / PLACEMENT | 89
IDU
OD)
No Increase
No Increase
No Increase
No Increase
No Increase
No Increase
No Increase
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