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The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations.
System Using Y-branches
Example: Five (5) indoor units connected
Water-Source Units (WSU).
IDU: Indoor Units.
A: Main Pipe from Water-Source Unit to Y-branch.
B: Y-branch to Y-branch.
C: Y-branch to Indoor Unit.
D: Y-branch to Farthest Indoor Unit.
Note:
• Always reference the LATS Multi V software
report.
Note:
See pages 32-33 for refrigerant pipe diameter and pipe length tables.
System Using a Header
Example: Six (6) indoor units connected
Water-Source Units (WSU).
IDU: Indoor Units.
Header.
A: Main Pipe from Water-Source Unit to Header.
C: Header to Indoor Unit.
D: To Farthest Indoor Unit.
Note:
• Indoor units should be installed at a lower
position than the Header.
• Y-branch pipes cannot be used after
Headers.
• Install the Header so that the pipe dis-
tances between the between the con-
nected indoor units are minimized. Large
differences in pipe distances can cause in-
door unit performances to fluctuate.
• Always reference the LATS Multi V software
report.
Note:
See pages 32-33 for refrigerant pipe diameter and pipe length tables.
REFRIGERANT PIPING DESIGN
Y-branch
IDU
Elevation2: ≤49 feet
Water Source Unit
Elevation2: ≤49 feet
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.
Water
Source
Unit
To Water
Source
Unit
Length: ≤230 feet
: ≤131 feet
B
B
C
C
C
IDU
IDU
Length: ≤230 feet
Header
C
C
C
C
C
IDU
IDU
IDU IDU
Pipe Sizing
Y-branch
To Indoor
Units
B
D
C
IDU
IDU
: ≤131 feet
Brazed Cap
D
C
IDU
IDU
31
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