LG MULTI V S ARUN048GSS4

31
Refrigerant Piping Connections
Due to our policy of continuous product innovation, some specifications may change without notification.
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IDU: Indoor Units.
Y-branches.
Header.
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B: Pipe from Y-branch to Y-branch or Header.
C: Pipe from Y-branch or Header to Indoor Unit.
D: Pipe to Farthest Indoor Unit.
• 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-
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differences in pipe distances can cause in-
door unit performances to fluctuate.
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report.
System Using Y-branches and Header
Elevation1  164 feet
Multi V S Unit
Header
First
Y-Branch
Second
Y-Branch
Ɛ  131 feet
Elevation2  49
Length  492 feet
Brazed Cap
IDUIDU
IDU
IDU
IDU
Y-branch
To Multi V S
Outdoor Unit
To Indoor
Units
REFRIGERANT PIPING CONNECTIONS
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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.
1
For calculation purposes, assume equivalent pipe length of Y-branch is 1.6 feet, and equivalent pipe length of header is 3.3 feet.
Length
Total pipe length Longest actual pipe length Equivalent pipe length
1
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Longest pipe length after first branch
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Elevation1
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When the Outdoor unit is Positioned Higher than the Indoor Units When the Outdoor unit is Positioned Lower than the Indoor Units
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Elevation2
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'LVWDQFHEHWZHHQÀWWLQJVDQG<%UDQFKHV+HDGHUV LQFKHV
'LVWDQFHEHWZHHQWZR<%UDQFKHV+HDGHUV LQFKHV
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 Ø1/4 Ø1/2
<54,600 Ø3/8 Ø5/8
 Ø3/8 Ø3/4
Table 18: Refrigerant Pipe Diameter (B) from Y-branch to Y-branch / Header.
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• Y-branches and other header branches cannot be installed downstream of the initial header branch.
Table 19: Pipe Capabilities.