Pipe Sizing For Arwn Series Heat Pump Systems - LG Multi V Water IV Installation Manual

Triple-Frame Heat Pump Water Source Unit Connections
Figure 36: Heat Pump Triple-Frame Refrigerant Pipe Connections.
Vapor Pipe
Slave 2
Liquid Pipe
Not Used
for HP
A1
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.
Table 47: Heat Pump Triple-Frame Connection Pipe Sizes.
WSU
WSU System
System Size
Model
(tons)
30 ARWN360BAS4
36 ARWN432BAS4
40 ARWB480DAS4
48 ARWB576DAS4
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 PIPING INSTALLATION

Pipe Sizing for ARWN Series Heat Pump Systems

Vapor Pipe
Slave 1
Liquid Pipe
A2
ARCNN21 Kit
Two (2) Y-branches
for liquid pipe and vapor pipe
Master Frame Slave 1 Frame
ARWN144BAS4 ARWN144BAS4
ARWN144BAS4 ARWN144BAS4
ARWB192DAS4 ARWB144DAS4
ARWB192DAS4 ARWB192DAS4
Due to our policy of continuous product innovation, some specifications may change without notification.
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Vapor Pipe
Master
Liquid Pipe
A3
ARCNN31 Kit
Two (2) Y-branches
B
for liquid pipe and vapor pipe
B Pipe (in. OD)
If Equivalent Pipe
Length from WSU to
Slave 2 Frame
Farthest IDU is <295 ft.
Liquid
ARWN072BAS4 3/4
ARWN144BAS4 3/4
ARWB144DAS4 3/4
ARWB192DAS4 3/4
Liquid Pipe
Vapor Pipe
ARCNN21 and ARCNN31
Multi-Frame WSU
Heat Pump Systems
Y-Branch Connector Kits
C – Main Pipe Sized by LATS
To Indoor Units
B Pipe (in. OD)
If Equivalent Pipe
Length from WSU to
Farthest IDU is ≥295 ft.
Vapor Liquid Vapor
1-3/8 7/8 1-5/8
1-3/8 7/8 1-5/8
1-3/8 7/8 1-5/8
1-3/8 7/8 1-5/8
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