Pipe Sizing - LG MULTI V WATER MINI Engineering Manual

REFRIGERANT PIPING DESIGN

Pipe Sizing

The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations.
Water Mini 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.
Always reference the LATS Multi V software
report.
See pages 61-62 for refrigerant pipe diameter and pipe length tables.
Water Mini 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.
• Indoor units must be installed at a lower
position than the Header.
• Y-branch pipes cannot be used after Headers.
• Install the Header 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.
• Always reference the LATS software report.
See pages 61-62 for refrigerant pipe diameter and pipe length tables.
60 | LIMITS / PL ACEMENT
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.
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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
Y-branch
To Indoor
Units
D
B
C
IDU
IDU
: ≤131 feet
Brazed Cap
C D
IDU
IDU