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MULTI V IV System Installation Manual
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Pipe Connections—Connecting Branch Pipes (Heat Pump)
Use caution when installing the branch pipe vertically between the outdoor units. Improper installation can cause uneven refrigerant distribution
between the outdoor units, and may lead to compressor burn and reduced system capacity.
For Dual-Frame Heat Pump Systems
REFRIGERANT PIPING DESIGN
Multi-Frame
Connector
Combination Vapor pipe Liquid pipe
ARCNN21
Combination specification Vapor pipe Liquid pipe
ARCNN21
ARCNN31
Unit: inch
Unit: inch
B
B
5-1/8
I.D. 1-1/2
O.D.1-3/8
I.D.1-5/8
16-3/8
16-1/16
4-3/8
I.D.1-3/8
I.D. 1-1/4
I.D. 1-1/8
I.D. 1-1/8
I.D.1-1/8
I.D.7/8
4-3/4
I.D.7/8
I.D.
3/4
O.D. 1-1/8
13-1/16
12-3/8
O.D. 3/4
O.D. 5/8
I.D. 3/4
I.D. 5/8
I.D. 5/8
I.D.5/8
I.D. 7/8
4-3/8
I.D. 1/2
I.D. 1/2
I.D. 1/2
I.D. 3/8
2-3/4
3-5/16
I.D. 3/8
5-1/8
I.D. 1-1/2
O.D.1-3/8
I.D.1-5/8
16-3/8
16-1/16
4-3/8
I.D.1-3/8
I.D. 1-1/4
I.D. 1-1/8
I.D. 1-1/8
I.D.1-1/8
I.D.7/8
4-3/4
I.D.7/8
I.D.
3/4
O.D. 1-1/8
13-1/16
12-3/8
O.D. 3/4
O.D. 5/8
I.D. 3/4
I.D. 5/8
I.D. 5/8
I.D.5/8
I.D. 7/8
4-3/8
I.D. 1/2
I.D. 1/2
I.D. 1/2
I.D. 3/8
2-3/4
3-5/16
I.D. 3/8
I.D. 1-3/8
O.D. 1-3/8
4-15/16
16
13-15/16
4-3/8
I.D. 1-5/8
I.D. 1-1/8
4-3/4
I.D. 1-5/8
I.D. 7/8
I.D.
3/4
O.D.1-1/8
I.D. 1-3/8
I.D. 1-1/2
O.D. 3/4
O.D. 3/4
I.D. 5/8
I.D.
7/8
I.D. 1/2
13-3/16
11-1/16
3-5/16
I.D.
3/8
O.D. 3/4
I.D. 5/8
O.D. 1/2
I.D. 1/2
I.D. 1/4
X2
4-3/8 4-3/8
Multi-Frame
Connector
Install the branch pipe between the outdoor units so that the outlet pipe is parallel with the surface.
A
B
T
o
outdoor unit
T
o
branch piping or indoor unit
A
B
Viewed from point A
in direction of arrow
Within ±10º
Facing up
Facing down
Within ±3°Within ±3°
Blow nitrogen while
brazing
Do not cut this pipe shorter
than 2-3/4 inches long
For Triple-Frame Heat Pump Systems
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