Piping Limitations - LG Multi V Water V ARWM072CAS5 Engineering Manual

Variable refrigerant flow water source outdoor units

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Service manual (157 pages)

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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.

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

height1

≤16 feet

• 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.

Table 31: Main Pipe (A) Diameter from Water Source Unit to First Y-branch / Header Branch.

Equivalent pipe length from WSU to farthest IDU is <295 ft.

WSU Capacity

(tons)

Liquid pipe (inches OD)

Vapor pipe (inches OD)

3/8

3/4

3/8

7/8

1/2

1-1/8

1/2

1-1/8

5/8

1-1/8

5/8

1-3/8

3/4

1-3/8

3/4

1-3/8

3/4

1-5/8

3/4

1-5/8

3/4

1-5/8

60 | LIMITS / PLACEMENT

Slave WSU

Master WSU

Y-branch

To WSU

To indoor units

ulti- rame

Y-branch

Connector

Header

Brazed Cap

Y-branch

(first)

IDU

Length: ≤492 feet (656 feet conditional application)

: ≤131 feet (295 feet conditional application)

Y-branch

IDU

(second)

IDU

Equivalent pipe length from WSU to farthest IDU is ≥295 ft.

Liquid pipe (inches OD)

Vapor pipe (inches OD)

1/2

3/4

1/2

7/8

5/8

1-1/8

5/8

1-1/8

3/4

1-1/8

3/4

1-3/8

7/8

1-3/8

7/8

1-3/8

7/8

1-5/8

7/8

1-5/8

7/8

1-5/8

PIPING LIMITATIONS

For Systems Designed for Heat Pump Configuration

For Systems Designed for Heat Pump Operation

Following pages present Multi V Water V piping limitations and are for illustrative purposes only. Designers MUST use LATS when designing LG VRF

Following pages present Multi V 5 piping limitations and are for illustrative purposes only. Designers MUST use LATS when designing LG VRF systems.

systems.

Table 32: Pipe Diameters (B) from Y-branch to Y-branch / Header.

Table 3: Pipe Diameters (B) from Y-branch to Y-branch / Header.

Downstream Total Capacity of IDUs (Btu/h)

Liquid pipe (inches OD)

≤19,100

1/4Ø

≤54,600

3/8Ø

≤76,400

3/8Ø

≤114,700

3/8Ø

≤172,000

1/2Ø

≤229,300

5/8Ø

≤248,400

5/8Ø

≤344,000

3/4Ø

≤592,500

3/4Ø

or the first branch pipe, use the branch pipe that matches main pipe A diameter.

Table 33: Indoor Unit Connecting Pipe from Branch (C).

Table 4: Indoor Unit Connecting Pipe from Branch (C).

Indoor Unit Capacity

Liquid pipe (inches OD)

Vapor pipe (inches OD)

≤19,100

1/4Ø

≤54,600

3/8Ø

≤76,400

3/8Ø

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).

Conditional Applications

Triple-Frame Heat Pump Water Source Unit Connections

Conditional applications are computed in LATS. See below for an explanation of when pipes are upsized.

Figure 26: Heat Pump Triple-Frame Connections.

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

Vapor Pipe

Slave 2

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-

Liquid Pipe

Vapor Pipe

sible.

Slave 1

Liquid Pipe

• 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

Not Used

feet.

for HP

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:

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).

ARCNN21 Kit

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.

Two (2) Y-branches

for liquid pipe and vapor pipe

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

70 | LIMITS / PLACEMENT

• 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.

• 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.

PIPING LIMITATIONS

Vapor pipe (inches OD)

1/2Ø

5/8Ø

3/4Ø

7/8Ø

1-1/8Ø

1-3/8Ø

1-5/8Ø

1/2Ø

5/8Ø

3/4Ø

Vapor Pipe

Master

Liquid Pipe

ARCNN21 and ARCNN31

Multi-Frame WSU

Heat Pump Systems

Y-Branch Connector Kits

C – Main Pipe Sized by LATS

ARCNN31 Kit

Two (2) Y-branches

for liquid pipe and vapor pipe

LIMITS / PLACEMENT | 61

Liquid Pipe

Vapor Pipe

To Indoor Units

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Piping Limitations - LG Multi V Water V ARWM072CAS5 Engineering Manual

PIPING LIMITATIONS

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