LG Multi IV User Manual

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Refrigerant Piping Design & Layout Best Practices
Example: Triple-frame system, four (4) heat recovery units,
one (1) header, and twelve (12) indoor units connected
ODU: Outdoor Units.
HRU: Heat Recovery Units.
IDU: Indoor units.
A: Main Pipe from Outdoor Unit to First Y-branch.
B: Heat Recovery Unit to Heat Recovery Unit, Y-branch to Heat
Recovery Unit, Heat Recovery Unit to Header, or Y-branch to Y-branch.
C: Heat Recovery Unit / Header to Indoor Unit.
Case 1: Maximum height is 131 feet if installed with a Y-branch.
Case 2: Maximum height is 16 feet in heat recovery control unit series connection.
*
Elevation1
Elevation2
Master ODU
Slave1
ODU
Slave2
ODU
Case 1
Case 2
A
Y-branch (first)
B
C
Closest
IDU
C
HRU
C
C
B
B
C
C
C
C
B
B
C
C
x
Header
C
C
To indoor units
To
outdoor unit
Y-branch
height1
≤16-7/16 feet
B
Y-branch (second)
HRU
HRU
HRU
IDU
IDU
IDU
IDU
IDU
IDU
IDU
IDU
IDU
IDU
Farthest
IDU
Brazed
cap
49 feet
16 feet
Elevation3
Elevation4
Pipe Sizing for ARUB Series Heat Recovery Systems
• Connection piping from branch to branch cannot exceed the main
pipe diameter (A) used by the outdoor unit.
• Install the header branches or heat recovery units so that the pipe
distances between the connected indoor units are minimized.
Large differences in pipe distances can cause indoor unit perfor-
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• Y-branches and other headers branches cannot be installed down-
stream of the initial header branch.
• Total capacity of indoor units in series connection of heat
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• If large capacity indoor units (>12,000 Btu/h with piping sizes
>5/8Ø / 3/8Ø) are installed, the valve group setting should be used.
(Refer to the PCB of the heat recovery unit for the valve group
control setting.)
• Always reference the LATS Multi V software report.
Piping Design Guideline Summary
• Larger-capacity outdoor units must be the master in a multi-frame
system.
• Single-compressor outdoor units (72,000 Btu/h capacity) cannot be the
master outdoor unit 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.
See pages 125-126 for refrigerant pipe diameter and pipe length
tables.
The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations.
ODU
Capacity
(ton)
Standard Pipe Diameter
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Liquid Pipe
(inches OD)
Low Pressure Vapor
Pipe (inches OD)
High Pressure Vapor
Pipe (inches OD)
Liquid Pipe
(inches OD)
Low Pressure Vapor
Pipe (inches OD)
High Pressure Vapor
Pipe (inches OD)
6 3/8Ø 3/4Ø 5/8Ø 1/2Ø No Increase No Increase
8 3/8Ø 7/8Ø 3/4Ø 1/2Ø No Increase No Increase
10 1/2Ø 1-1/8Ø 3/4Ø 5/8Ø No Increase No Increase
12 1/2Ø 1-1/8Ø 7/8Ø 5/8Ø No Increase No Increase
12-14* 5/8Ø 1-1/8Ø 7/8Ø 3/4Ø No Increase No Increase
14-16 5/8Ø 1-1/8Ø 7/8Ø 3/4Ø No Increase No Increase
18-20 5/8Ø 1-3/8Ø 1-1/8Ø 3/4Ø No Increase No Increase
22-28 3/4Ø 1-3/8Ø 1-1/8Ø 7/8Ø No Increase No Increase
30-42 3/4Ø 1-5/8Ø 1-1/8Ø 7/8Ø No Increase No Increase
Table 39: Main Pipe (A) Diameter from Outdoor Unit to First Y-branch.
*ARUB145BTE4 / ARUB145DTE4 and ARUB169BTE4 / ARUB169DTE4 only.
REFRIGERANT PIPING DESIGN

LG Multi IV Specifications

General

Brand	LG
Model	Multi IV
Category	Heat Pump
Language	English