LG MULTI V WATER 5 ARW Series User Manual

LIMITS / PLACEMENT | 75
Piping Limitations and Placement Considerations
Due to our policy of continuous product innovation, some specications may change without notication.
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Figure 18: Heat Recovery Triple-Frame Connections.
Triple-Frame Heat Recovery Water Source Unit Connections
• A1, A2, and A3 diameters match the water source unit connection diameters. Main pipe C diameters are sized by LATS.
• For single and dual frame systems, the pipe size is the same size as the frame connections.
• Always reference the LATS Multi V software report.
• The largest capacity water source unit must be the main unit in a multi-frame system.
• Main water source unit capacity must be greater than or equal to the sub1 water source unit capacity, and, where applicable, sub1 water
source unit capacity must be greater than or equal to the sub2 water source unit capacity.
• Connection piping from branch to branch cannot exceed the main pipe diameter (A) used by the water source 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.
• Outdoor unit Y-branches can only be installed in a horizontal or vertical UP configuration. The vertical DOWN configuration is not permitted.
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.
Sub 2
Sub 1
Main
To Heat Recovery Units
A1
A2
ARCNB21 Kit
Three (3) Y-branches
for liquid pipe, high-pressure vapor
pipe, and low-pressure vapor pipe
B
A3
C – Main Pipe Sized by LATS
Liquid Pipe
Low Pressure Vapor
ARCNB21 and ARCNB31
Multi-Frame WSU
Heat Recovery Systems
Y-Branch Connector Kits
Liquid Pipe
Low Pressure
Vapor Pipe
Represents THREE* pipes
ARCNB31 Kit
Three (3) Y-branches
for liquid pipe, high-pressure vapor
pipe, and low-pressure vapor pipe
*Liquid
Low Pressure Vapor
High Pressure Vapor
High Pressure Vapor
Liquid Pipe
Low Pressure Vapor
High Pressure Vapor
Liquid Pipe
Low Pressure Vapor
High Pressure Vapor
High Pressure
Vapor Pipe

LG MULTI V WATER 5 ARW Series Specifications

General

Brand	LG
Model	MULTI V WATER 5 ARW Series
Category	Heat Pump
Language	English