LG Multi V 5 Engineering Manual

LIMITS / PLACEMENT | 89
Piping Limitations and Placement Considerations
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height1: 16-7/16 feet
Slave 2 ODU
Slave 1 ODU
Master ODU
To Indoor Units
Y-Branch
To Outdoor Units
Elevation1:  feet
Y-Branch
Elevation2: IHHW
Length: 492 feet (656 feet conditional application)
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IDU
IDU
IDU
IDU
IDU
IHHW
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.
ODU Capacity (ton)
Pipe diameter when pipe length is
<295 feet (Standard)
Pipe diameter when pipe length is
IHHW2'8ļ,'8
Pipe diameter when height differential
2'8ļ,'8LV!IHHW
Liquid pipe (inches
OD)
Vapor pipe (inches
OD)
Liquid pipe (inches
OD)
Vapor pipe (inches
OD)
Liquid pipe (inches
OD
Vapor pipe (inches
OD)
6 3/8Ø 3/4Ø 1/2Ø 7/8Ø 1/2Ø No Increase
8 3/8Ø 7/8Ø 1/2Ø 1-1/8Ø 1/2Ø No Increase
10-12 1/2Ø 1-1/8Ø 5/8Ø No Increase 5/8Ø No Increase
14-18 5/8Ø 1-1/8Ø 3/4Ø No Increase 3/4Ø No Increase
20 5/8Ø 1-3/8Ø 3/4Ø No Increase 3/4Ø No Increase
22-28 3/4Ø 1-3/8Ø 7/8Ø No Increase 7/8Ø No Increase
30-42 3/4Ø 1-5/8Ø 7/8Ø No Increase 7/8Ø No Increase
Table 21: Main Pipe (A) Diameters from Outdoor Unit to First Y-branch / Header Branch.
PIPING LIMITATIONS
For Systems Designed for Heat Pump Operation
Following pages present Multi V 5 piping limitations and are for illustrative purposes only. Designers MUST use LATS when designing LG VRF systems.

LG Multi V 5 Specifications

General

Type	VRF (Variable Refrigerant Flow)
Refrigerant	R410A
Compressor Type	Inverter Scroll Compressor
Outdoor Unit Fan Type	Axial Fan
Cooling Capacity	22.4 kW to 270 kW
Energy Efficiency	High
Operating Range	Cooling: -5°C to 48°C
Power Supply	380-415V, 50/60Hz
Heat Exchanger Type	Microchannel
Control Type	Centralized Control
Indoor Unit Options	Cassette, Wall Mounted, Ducted
Heat Recovery	Available
Warranty	Varies by region (typically 5 years compressor, 1-2 years parts)