LG Multi V Water IV - Refrigerant Piping Installation: Pipe Sizing for ARWB Heat Recovery Systems (Triple-Frame Example); Heat Recovery Unit Pipe Sizing; Main Pipe (A) Diameter for HRU Systems

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Refrigerant Piping
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REFRIGERANT PIPING INSTALLATION
Example: Triple-frame system, four (4)
heat recovery units, one (1) header, and
twelve (12) indoor units connected
WSU: Water Source Units.
HRU: Heat Recovery Units.
IDU: Indoor units.
A: Main Pipe from Water Source Unit
to First Y-branch.
B: Heat Recovery Unit to Heat Recovery
Unit, Y-branch to Heat Recovery Unit,
Heat Recovery Unit to Header, or
Y-branch to Y-branch.
C: Heat Recovery Unit or Header
to Indoor Unit.
WSU
Capacity
(ton)
Pipe diameter when equivalent pipe length
from WSU to farthest IDU is <295 ft.
Pipe diameter when equivalent pipe length
from WSU to farthest IDU is ≥295 ft.
Liquid Pipe
(inches OD)
Low Pressure Vapor
Pipe (inches OD)
High Pressure Vapor
Pipe (inches OD)
Liquid Pipe
(inches OD)
Low Pressure Vapor
Pipe (inches OD)
High Pressure Vapor
Pipe (inches OD)
6 3/8 7/8 3/4 1/2 7/8 3/4
8 3/8 7/8 3/4 1/2 1-1/8 3/4
10 1/2 1-1/8 3/4 5/8 1-1/8 3/4
12 1/2 1-1/8 3/4 5/8 1-1/8 3/4
14 1/2 1-1/8 3/4 5/8 1-1/8 3/4
16 1/2 1-1/8 3/4 5/8 1-1/8 3/4
18 3/4 1-3/8 1-1/8 7/8 1-3/8 1-1/8
20 3/4 1-3/8 1-1/8 7/8 1-3/8 1-1/8
22 3/4 1-3/8 1-1/8 7/8 1-3/8 1-1/8
24 3/4 1-3/8 1-1/8 7/8 1-3/8 1-1/8
26 3/4 1-3/8 1-1/8 7/8 1-3/8 1-1/8
28 3/4 1-3/8 1-1/8 7/8 1-3/8 1-1/8
30 3/4 1-5/8 1-3/8 7/8 1-5/8 1-3/8
32 3/4 1-5/8 1-3/8 7/8 1-5/8 1-3/8
34 3/4 1-5/8 1-3/8 7/8 1-5/8 1-3/8
36 3/4 1-5/8 1-3/8 7/8 1-5/8 1-3/8
40 3/4 1-5/8 1-3/8 7/8 1-5/8 1-3/8
48 3/4 1-5/8 1-3/8 7/8 1-5/8 1-3/8
Pipe Sizing When Installing Heat Recovery Units
Table 53: Main Pipe (A) Diameter from WSU to First Y-branch.
Note:
• Connection piping from branch to branch cannot
exceed main pipe diameter (A) used by WSU.
• Install the header branches or heat recovery
units so that the pipe distances between the
connected indoor units are minimized. Large
differences in pipe distances can cause indoor
unit performances to uctuate.
• Y-branches and other headers branches cannot
be installed downstream of initial header branch.
• Total capacity of indoor units in series connection of heat
recovery units ≤192,400 Btu/h.
• Always reference the LATS Multi V software report.
Pipe Sizing for ARWB Series Heat Recovery Systems
• Larger-capacity water source units must be the master in a multi-frame system.
• Master WSU capacity must be greater than or equal to the slave1 WSU
capacity, and, where applicable, slave1 WSU capacity must be greater than
or equal to the slave2 WSU capacity.
• Refer to refrigerant pipe diameter and pipe length tables for actual lengths.
The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations.
Elevation 1 ≤164 ft.
Elevation 2 ≤131 ft.
Slave 1 WSU
Slave 2 WSU
A
Y-branch (first)
B
C
Closest
IDU
C
HRU
C
C
B
B
C
C
C
C
B
B
C
C
x
Header
C C
Elevation 5:
≤16
B
Y-branch (second)
HRU
HRU
HRU
IDU
IDU
IDU
IDU
IDU
IDU
IDU
IDU IDU IDU
Farthest
IDU
Brazed
cap
49 ft.
16 feet
Master WSU
Elevation 3 ≤49 ft.
Multi-Frame
Connector
To indoor units
To WSU
Y-branch
Elevation 4: ≤49 ft.