LG MULTI V IV ARUN072BTE4 - Page 111

113
Installation
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Triple-Frame Heat Recovery Outdoor Unit Connections
REFRIGERANT PIPING DESIGN
Pipe Sizing for Heat Recovery Systems
Table 39: Heat Recovery Triple-Frame Connection Pipe Sizes.
Figure 27: Heat Recovery Triple-Frame Connections.
• Larger-capacity outdoor units must be the master in a multi-frame system.
• Single-compressor outdoor units (72,000 Btu/h capacity) cannot be the master outdoor unit in a multi-frame system.
• Master outdoor unit capacity must be greater than or equal to the slave1 outdoor unit capacity, and, where applicable, slave1 outdoor
unit capacity must be greater than or equal to the slave2 outdoor unit capacity.
• Insulate all refrigerant system piping and piping connections as detailed on pages 131-132.
• Common pipe no longer required between frames.
Diameters for A1, A2, and A3 match the outdoor unit connection diameters. Main pipe D diameters are sized by LATS.
See the table below for B diameters.
Size
(tons)
Model Master Slave1 Slave2
B
Liquid
Low Pressure
Vapor
High Pressure
Vapor
26
ARUB312BTE4 ARUB144BTE4 ARUB096BTE4 ARUB072BTE4
5/8" 1-1/8" 7/8
ARUB312DTE4 ARUB144DTE4 ARUB096DTE4 ARUB072DTE4
28
ARUB336BTE4 ARUB144BTE4 ARUB096DTE4 ARUB096BTE4
5/8" 1-1/8" 7/8
ARUB336DTE4 ARUB144DTE4 ARUB096DTE4 ARUB096DTE4
30
ARUB360BTE4 ARUB144BTE4 ARUB121BTE4 ARUB096BTE4
5/8" 1-1/8" 7/8
ARUB360DTE4 ARUB144DTE4 ARUB121DTE4 ARUB096DTE4
Note:
To Heat
Recovery Units
ARCNB21 and ARCNB31
Outdoor Unit Connector
Pipe Accessories
Slave2
Master
Slave1
A1
A2
ARCNB21
(Multi-frame Outdoor Unit
Y-branch Connector)
ARCNB31
(Multi-frame Outdoor Unit
Y-branch Connector)
B
A3
D (main pipe
sized by LATS)