LG Multi V Water IV - Refrigerant Piping Installation: Pipe Sizing for ARWN Heat Pump Systems; Triple-Frame Heat Pump WSU Connections; Triple-Frame Heat Pump Connection Pipe Sizes

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Refrigerant Piping
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Table 47: Heat Pump Triple-Frame Connection Pipe Sizes.
Figure 36: Heat Pump Triple-Frame Refrigerant Pipe Connections.
REFRIGERANT PIPING INSTALLATION
Pipe Sizing for ARWN Series Heat Pump Systems
Triple-Frame Heat Pump Water Source Unit Connections
WSU
System Size
(tons)
WSU System
Model
Master Frame Slave 1 Frame Slave 2 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 Vapor Liquid Vapor
30 ARWN360BAS4 ARWN144BAS4 ARWN144BAS4 ARWN072BAS4 3/4 1-3/8 7/8 1-5/8
36 ARWN432BAS4 ARWN144BAS4 ARWN144BAS4 ARWN144BAS4 3/4 1-3/8 7/8 1-5/8
40 ARWB480DAS4 ARWB192DAS4 ARWB144DAS4 ARWB144DAS4 3/4 1-3/8 7/8 1-5/8
48 ARWB576DAS4 ARWB192DAS4 ARWB192DAS4 ARWB192DAS4 3/4 1-3/8 7/8 1-5/8
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 47 for B pipe diameters.
Slave 2
Slave 1
Master
To Indoor Units
A1
A2
ARCNN21 Kit
Two (2) Y-branches
for liquid pipe and vapor pipe
B
A3
C – Main Pipe Sized by LATS
Liquid Pipe
Vapor Pipe
Not Used
for HP
Liquid Pipe
Vapor Pipe
Liquid Pipe
Vapor Pipe
ARCNN21 and ARCNN31
Multi-Frame WSU
Heat Pump Systems
Y-Branch Connector Kits
Liquid Pipe
Vapor Pipe
Represents TWO pipes: Liquid and Vapor
ARCNN31 Kit
Two (2) Y-branches
for liquid pipe and vapor pipe