LG Multi V 5 Engineering Manual

92 | LIMITS / PLACEMENT
MULTI V 5 Outdoor Unit Engineering Manual
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ODU
Capacity
(ton)
Standard Pipe Diameter
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GLIIHUHQWLDO2'8ļ,'8LV!IHHW
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
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 25: Main Pipe (A) Diameters from Outdoor Unit to First Y-branch.
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.
PIPING LIMITATIONS
For Systems Designed for Heat Recovery Operation
Following pages present Multi V 5 piping limitations and are for illustrative purposes only. Designers MUST use LATS when designing LG VRF systems.
• 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 capac-
ity, 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 or heat recovery units so that the pipe distances between the between the connected indoor units are mini-
mized. 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.
• 7RWDOFDSDFLW\RILQGRRUXQLWVLQVHULHVFRQQHFWLRQRIKHDWUHFRYHU\XQLWV%WXK
• 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.)
Example of Pipe Sizing When Installing a Heat Recovery System
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
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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

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)