LG MULTI V WATER MINI Engineering Manual page 62

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.
Selecting the Refrigerant Piping
Example: Five (5) indoor units connected
Water Source Units (WSU).
IDU: Indoor Units.
A: Main Pipe from Water Source Unit to Y-branches.
B: Branch Piping.
C: Branch Piping to Indoor Unit (IDU).
Table 31: Size of Main Pipe (A) (From Water Source Unit to Y-branches).
Water Source Unit Capacity (Btu/h)
54,600
Table 32: Size of Branch Piping (B) to Branch Piping (B).
Indoor Unit Capacity (Btu/h)
19,100
54,600
76,400
Table 33: Size of Branch Piping to Indoor Unit (C).
Indoor Unit Capacity (Btu/h)
19,100
54,600
62 | LIMITS / PL ACEMENT
Figure 31: Selecting Refrigerant Piping.
Gas Pipe
Main Pipe
A
Liquid Pipe (Inches O.D.)
Liquid Pipe (Inches O.D.)
Liquid Pipe (Inches O.D.)
Due to our policy of continuous product innovation, some specifications may change without notification.
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Water Source Unit
Liquid Pipe
Branch Piping
B
Header
C
Branch Piping
B
C
Ø3/8
Ø1/4
Ø3/8
Ø3/8
Ø1/4
Ø3/8
Header
C C C
IDU IDU IDU
Branch Piping
B
C C
IDU
IDU
Gas Pipe (Inches O.D.)
Ø3/4
Gas Pipe (Inches O.D.)
Ø1/2
Ø5/8
Ø3/4
Gas Pipe (Inches O.D.)
Ø1/2
Ø5/8
IDU
IDU