60 | LIMITS / PLACEMENT
LIMITS / PLACEMENT | 61
Piping Limitations and Placement Considerations
MUL
TI V W
ater IV Source Unit Engineering Manual
© LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp.
.
© LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp.
Example of Pipe Sizing When Installing a Heat Pump System
Example: Five (5) indoor Units Connected
WSU: Water Source Unit
IDU: Indoor Unit
A: Main Pipe from Water Source Unit to First
Y-branch
B: Y-branch to Y-branch / Header
C: Y-branch / Header to Indoor Unit
PIPING LIMITATIONS
For Systems Designed for Heat Pump Configuration
Following pages present Multi V Water V piping limitations and are for illustrative purposes only. Designers MUST use LATS when designing LG VRF
systems.
Master WSU
Slave WSU
Elevation2:
≤131 feet
B
C
B
C
≤33 feet
A
Length: ≤492 feet (656 feet conditional application)
: ≤131 feet (295 feet conditional application)
Elevation1:
≤164 feet
IDU
IDU
Header
IDU
IDU
IDU
Brazed Cap
C
height1
≤16 feet
Y-branch
(first)
Y-branch
(second)
To indoor units
To WSU
Y-branch
ulti- rame
Y-branch
Connector
C
C
• Always reference the LATS Multi V software report.
• Larger-capacity units must be the master in a multi-frame system.
• Master water source unit capacity must be greater than or equal to the slave 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.
WSU Capacity
(tons)
Equivalent pipe length from WSU to farthest IDU is <295 ft.
Equivalent pipe length from WSU to farthest IDU is ≥295 ft.
Liquid pipe (inches OD)
Vapor pipe (inches OD)
Liquid pipe (inches OD)
Vapor pipe (inches OD)
6
3/8
3/4
1/2
3/4
8
3/8
7/8
1/2
7/8
10
1/2
1-1/8
5/8
1-1/8
12
1/2
1-1/8
5/8
1-1/8
16
5/8
1-1/8
3/4
1-1/8
20
5/8
1-3/8
3/4
1-3/8
24
3/4
1-3/8
7/8
1-3/8
28
3/4
1-3/8
7/8
1-3/8
36
3/4
1-5/8
7/8
1-5/8
40
3/4
1-5/8
7/8
1-5/8
48
3/4
1-5/8
7/8
1-5/8
Table 31: Main Pipe (A) Diameter from Water Source Unit to First Y-branch / Header Branch.
Figure 26: Heat Pump Triple-Frame Connections.
Triple-Frame Heat Pump 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.
Slave 2
Slave 1
Master
To Indoor Units
A1
A2
ARCNN21 Kit
Two (2) Y-branches
for liquid pipe and vapor pipe
B
A3
C – Main Pipe Sized by LATS
Liquid Pipe
Vapor Pipe
Not Used
for HP
Liquid Pipe
Vapor Pipe
Liquid Pipe
Vapor Pipe
ARCNN21 and ARCNN31
Multi-Frame WSU
Heat Pump Systems
Y-Branch Connector Kits
Liquid Pipe
Vapor Pipe
Represents TWO pipes: Liquid and
Vapor
ARCNN31 Kit
Two (2) Y-branches
for liquid pipe and vapor pipe
PIPING LIMITATIONS
For Systems Designed for Heat Pump Configuration
Following pages present Multi V Water V 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 water source units must be the master in a multi-frame system.
• Master water source unit capacity must be greater than or equal to the slave1 water source unit capacity, and, where applicable, slave1
water source unit capacity must be greater than or equal to the slave2 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.
70 | LIMITS / PLACEMENT
MUL
TI V 5 Outdoor Unit Engineering Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©
LG Electronics Canada, Inc., North York, ON. All rights reserved. “LG” is a registered trademark of LG Corp.
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.
1
or the first branch pipe, use the branch pipe that matches main pipe A diameter.
Table 3: Pipe Diameters (B) from Y-branch to Y-branch / Header.
If the pipe (B) diameters after the first branch are bigger than the main pipe (A) diameters, pipe (B) must changed to match main pipe (A)
sizes.
Example: When an indoor unit combination ratio of 120 is connected to a 22-ton outdoor unit:
Outdoor unit main pipe (A) diameters: 1-3/8Ø inches (vapor) and 5/8Ø inches (liquid).
1. Pipe (B) diameters: 1-3/8Ø (vapor) and 3/4Ø (liquid) (after the first branch, when indoor unit combination ratio is 120 [26 tons]).
2. After the first branch, pipe (B) diameters must be changed to 1-3/8Ø inches (vapor) and 5/8Ø inches (liquid) to match main pipe (A) sizes.
Instead of using the total indoor unit capacity to choose main pipe (A) diameters, use outdoor unit capacity to choose downstream main pipe
(A) diameters.
Do not permit connection pipes (B) from branch to branch to exceed main pipe (A) diameters as indicated by outdoor unit
capacity. Example: When an indoor unit combination ratio of 120 is connected to a 20-ton outdoor unit (24 tons), and indoor unit with a
7,000 Btu/h capacity is located at the first branch:
1. ain pipe (A) diameters on a 20-ton outdoor unit: 1-1/8Ø inches (vapor) and 5/8Ø inches (liquid).
2. Pipe diameters between first and second branches, however, are: 1-3/8Ø (vapor) and 3/4Ø (liquid) (connected downstream indoor unit
capacity is 20 tons).
3. If main pipe (A) diameters of a 20-ton outdoor unit are 1-1/8Ø (vapor) and 5/8Ø (liquid), then the pipe diameters between the first and
second branches must be changed to match.
Conditional Applications
Conditional applications are computed in LATS. See below for an explanation of when pipes are upsized.
If the equivalent length between the first Y-branch to the farthest indoor unit is >131 feet (up to 295 feet maximum):
• Pipe segment diameters between the first Y-branch and the second Y-branch must be sized up by one. This applies to both liquid and vapor
pipes. If the next size up is not available, or if the piping segment diameters are the same as main pipe (A) diameters, sizing up is not pos-
sible.
• While calculating the entire refrigerant pipe length, pipe lengths for B must be multiplied by two: A+( Bx2)+ C ≤3,281 feet.
• Length of pipe (C) from each indoor unit to the closest Y-branch or header ≤ 131 ft.
• [Length of pipe from outdoor unit to farthest indoor unit (A+B+C)] - [Length of pipe from outdoor unit to closest indoor unit (A+B+C)] ≤131
feet.
Table 4: Indoor Unit Connecting Pipe from Branch (C).
1
9,600-24,200 Btu/h 4-way 3 feet x 3 feet Cassette and 15,400-24,200 Btu/h High Static Ducted indoor units have 3/8Ø (liquid) and 5/8Ø (vapor).
Indoor Unit Capacity
1
Liquid pipe (inches OD)
Vapor pipe (inches OD)
≤19,100
1/4Ø
1/2Ø
≤54,600
3/8Ø
5/8Ø
≤76,400
3/8Ø
3/4Ø
,
3
Downstream Total Capacity of IDUs (Btu/h)
Liquid pipe (inches OD)
Vapor pipe (inches OD)
≤19,100
1/4Ø
1/2Ø
≤54,600
3/8Ø
5/8Ø
≤76,400
3/8Ø
3/4Ø
≤114,700
3/8Ø
7/8Ø
≤172,000
1/2Ø
1-1/8Ø
≤229,300
5/8Ø
1-1/8Ø
≤248,400
5/8Ø
1-3/8Ø
≤344,000
3/4Ø
1-3/8Ø
≤592,500
3/4Ø
1-5/8Ø
Table 32: Pipe Diameters (B) from Y-branch to Y-branch / Header.
Table 33: Indoor Unit Connecting Pipe from Branch (C).
70 | LIMITS / PLACEMENT
MUL
TI V 5 Outdoor Unit Engineering Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©
LG Electronics Canada, Inc., North York, ON. All rights reserved. “LG” is a registered trademark of LG Corp.
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.
1
or the first branch pipe, use the branch pipe that matches main pipe A diameter.
Table 3: Pipe Diameters (B) from Y-branch to Y-branch / Header.
If the pipe (B) diameters after the first branch are bigger than the main pipe (A) diameters, pipe (B) must changed to match main pipe (A)
sizes.
Example: When an indoor unit combination ratio of 120 is connected to a 22-ton outdoor unit:
Outdoor unit main pipe (A) diameters: 1-3/8Ø inches (vapor) and 5/8Ø inches (liquid).
1. Pipe (B) diameters: 1-3/8Ø (vapor) and 3/4Ø (liquid) (after the first branch, when indoor unit combination ratio is 120 [26 tons]).
2. After the first branch, pipe (B) diameters must be changed to 1-3/8Ø inches (vapor) and 5/8Ø inches (liquid) to match main pipe (A) sizes.
Instead of using the total indoor unit capacity to choose main pipe (A) diameters, use outdoor unit capacity to choose downstream main pipe
(A) diameters.
Do not permit connection pipes (B) from branch to branch to exceed main pipe (A) diameters as indicated by outdoor unit
capacity. Example: When an indoor unit combination ratio of 120 is connected to a 20-ton outdoor unit (24 tons), and indoor unit with a
7,000 Btu/h capacity is located at the first branch:
1. ain pipe (A) diameters on a 20-ton outdoor unit: 1-1/8Ø inches (vapor) and 5/8Ø inches (liquid).
2. Pipe diameters between first and second branches, however, are: 1-3/8Ø (vapor) and 3/4Ø (liquid) (connected downstream indoor unit
capacity is 20 tons).
3. If main pipe (A) diameters of a 20-ton outdoor unit are 1-1/8Ø (vapor) and 5/8Ø (liquid), then the pipe diameters between the first and
second branches must be changed to match.
Conditional Applications
Conditional applications are computed in LATS. See below for an explanation of when pipes are upsized.
If the equivalent length between the first Y-branch to the farthest indoor unit is >131 feet (up to 295 feet maximum):
• Pipe segment diameters between the first Y-branch and the second Y-branch must be sized up by one. This applies to both liquid and vapor
pipes. If the next size up is not available, or if the piping segment diameters are the same as main pipe (A) diameters, sizing up is not pos-
sible.
• While calculating the entire refrigerant pipe length, pipe lengths for B must be multiplied by two: A+( Bx2)+ C ≤3,281 feet.
• Length of pipe (C) from each indoor unit to the closest Y-branch or header ≤ 131 ft.
• [Length of pipe from outdoor unit to farthest indoor unit (A+B+C)] - [Length of pipe from outdoor unit to closest indoor unit (A+B+C)] ≤131
feet.
Table 4: Indoor Unit Connecting Pipe from Branch (C).
1
9,600-24,200 Btu/h 4-way 3 feet x 3 feet Cassette and 15,400-24,200 Btu/h High Static Ducted indoor units have 3/8Ø (liquid) and 5/8Ø (vapor).
Indoor Unit Capacity
1
Liquid pipe (inches OD)
Vapor pipe (inches OD)
≤19,100
1/4Ø
1/2Ø
≤54,600
3/8Ø
5/8Ø
≤76,400
3/8Ø
3/4Ø
,
3
Downstream Total Capacity of IDUs (Btu/h)
Liquid pipe (inches OD)
Vapor pipe (inches OD)
≤19,100
1/4Ø
1/2Ø
≤54,600
3/8Ø
5/8Ø
≤76,400
3/8Ø
3/4Ø
≤114,700
3/8Ø
7/8Ø
≤172,000
1/2Ø
1-1/8Ø
≤229,300
5/8Ø
1-1/8Ø
≤248,400
5/8Ø
1-3/8Ø
≤344,000
3/4Ø
1-3/8Ø
≤592,500
3/4Ø
1-5/8Ø