LG Multi V Water IV - Refrigerant Piping Installation: Pipe Sizing for ARWB Heat Recovery Systems (Triple-Frame); Triple-Frame Heat Recovery WSU Connections; Triple-Frame Heat Recovery Connection Pipe Sizes

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MULTI V Water IV System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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Table 52: Heat Recovery Triple-Frame Connection Pipe Sizes.
Figure 37: Heat Recovery Triple-Frame Refrigerant Pipe Connections.
Pipe Sizing for ARWB Series Heat Recovery Systems
REFRIGERANT PIPING INSTALLATION
WSU
System
Size
(tons)
WSU System
Model
Master WSU
Frame
Slave 1 WSU
Frame
Slave 2 WSU
Frame
B Pipe (in. OD)
If Equivalent Pipe Length from
WSU to Farthest IDU is <295 ft.
B Pipe (in. OD)
If Equivalent Pipe Length from
WSU to Farthest IDU is ≥295 ft.
Liquid
Low
Pressure
Vapor
High
Pressure
Vapor
Liquid
Low
Pressure
Vapor
High
Pressure
Vapor
30 ARWB360BAS4 ARWB144BAS4 ARWB144BAS4 ARWB072BAS4 3/4 1-3/8 1-1/8 7/8 1-5/8 1-1/8
36 ARWB432BAS4 ARWB144BAS4 ARWB144BAS4 ARWB144BAS4 3/4 1-3/8 1-1/8 7/8 1-5/8 1-1/8
40 ARWB480DAS4 ARWB192DAS4 ARWB144DAS4 ARWB144DAS4 3/4 1-3/8 1-1/8 7/8 1-5/8 1-1/8
48 ARWB576DAS4 ARWB192DAS4 ARWB192DAS4 ARWB192DAS4 3/4 1-3/8 1-1/8 7/8 1-5/8 1-1/8
Triple-Frame Heat Recovery Water Source Unit Connections
Slave 2
Slave 1
Master
To Heat Recovery Units
A1
A2
ARCNB21 Kit
Three (3) Y-branches
for liquid pipe, high-pressure vapor
pipe, and low-pressure vapor pipe
B
A3
C – Main Pipe Sized by LATS
Liquid Pipe
Low Pressure Vapor
ARCNB21 and ARCNB31
Multi-Frame WSU
Heat Recovery Systems
Y-Branch Connector Kits
Liquid Pipe
Low Pressure
Vapor Pipe
Represents THREE* pipes
ARCNB31 Kit
Three (3) Y-branches
for liquid pipe, high-pressure vapor
pipe, and low-pressure vapor pipe
*Liquid
Low Pressure Vapor
High Pressure Vapor
High Pressure Vapor
Liquid Pipe
Low Pressure Vapor
High Pressure Vapor
Liquid Pipe
Low Pressure Vapor
High Pressure Vapor
High Pressure
Vapor Pipe
Note:
• Larger-capacity water source units must be the master in a multi-frame system.
• Master water source unit capacity must be greater than or equal to the Slave 1 water source unit
capacity, and, where applicable, Slave 1 water source unit capacity must be greater than or equal
to Slave 2 water source unit capacity.
• Be sure to insulate all refrigerant system piping and piping connections.
Refrigerant Pipe Sizes for WSU Connections
• Figure 36 is for reference only, is not to scale, and does not represent required pipe routing.
• Multi-frame Y-branches MUST be installed horizontally as shown in Figure 22.
• A1, A2, and A3 pipe diameters match the water source unit connection diameters.
• Main pipe C diameters are sized by LATS.
• See Table 52 for B pipe diameters.