Sample Layouts; Due To Our Policy Of Continuous Product Innovation, Some Specifications May Change Without Notification - LG ARUM072BTE5 Installation Manual

INSTALLING FOR HEAT RECOVERY
OPERATION

Sample Layouts

Sample Layouts
Images are for illustrative purposes only and are not accurate representations. For specific details on piping limitations and other refrigerant system
rules, review the information in this entire piping section, see the Multi V 5 Engineering Manual, and follow the LATS diagram.
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.
• 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 ex-
ceed 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 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.
• Total capacity of indoor units in series connection of heat recovery units ≤192,400 Btu/h.
• If large capacity indoor units (>12,000 Btu/h with piping sizes >5/8Ø / 3/8Ø) are installed, the valve group setting must be used. (Refer to
the PCB of the heat recovery unit for the valve group control setting.)
Table 38: Main Pipe (A) Diameters from Outdoor Unit to First Y-branch.
ODU
Capacity
Liquid Pipe
(ton)
(inches OD)
6 3/8Ø
8 3/8Ø
10 1/2Ø
12 1/2Ø
14-16 5/8Ø
18-20 5/8Ø
22-28 3/4Ø
30-42 3/4Ø
80
Standard Pipe Diameter
Low Pressure Vapor High Pressure Vapor
Pipe (inches OD) Pipe (inches OD)
3/4Ø
7/8Ø
1-1/8Ø
1-1/8Ø
1-1/8Ø
1-3/8Ø
1-3/8Ø
1-5/8Ø

Due to our policy of continuous product innovation, some specifications may change without notification.

©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Slave2
ODU
Slave1
ODU
Master ODU
Closest
IDU
C
IDU
C
HRU
C
IDU
Case 1
C
IDU
C
IDU
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.
Pipe diameter when pipe length is ≥295 feet or when height
differential (ODU ↔ IDU) is >164 feet
Liquid Pipe
(inches OD)
5/8Ø 1/2Ø
3/4Ø 1/2Ø
3/4Ø 5/8Ø
7/8Ø 5/8Ø
7/8Ø 3/4Ø
1-1/8Ø 3/4Ø
1-1/8Ø 7/8Ø
1-1/8Ø 7/8Ø
A
Y-branch (first)
Y-branch
To
B
Outdoor Unit
B
Y-branch (second)
B
HRU
B
B
C
C
HRU
HRU IDU
B
Case 2
Header
C
C
IDU
C
IDU
IDU
IDU
Low Pressure Vapor High Pressure Vapor
Pipe (inches OD)
No Increase
No Increase
No Increase
No Increase
No Increase
No Increase
No Increase
No Increase
To Indoor Units
*
C
Brazed
cap
x
C
Farthest
IDU
IDU
Pipe (inches OD)
No Increase
No Increase
No Increase
No Increase
No Increase
No Increase
No Increase
No Increase