LG Multi IV - Heat Recovery Triple-Frame Connection Pipe Sizes; Heat Recovery Triple-Frame Connections; Pipe Sizing for ARUB Series Heat Recovery Systems

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MULTI V IV Outdoor Unit Engineering Manual
Table 38: Heat Recovery Triple-Frame Connection Pipe Sizes.
Figure 19: Heat Recovery Triple-Frame Connections.
Piping Design Guideline Summary
REFRIGERANT PIPING DESIGN
Pipe Sizing for ARUB Series Heat Recovery Systems
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)
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
ARUB336DTE4 ARUB144DTE4 ARUB096DTE4 ARUB096DTE4
30
ARUB360BTE4 ARUB144BTE4 ARUB121BTE4 ARUB096BTE4
1-1/8"
ARUB360DTE4 ARUB144DTE4 ARUB121DTE4 ARUB096DTE4
32
ARUB384BTE4 ARUB145BTE4 ARUB145BTE4 ARUB096BTE4
1-3/8"
ARUB384DTE4 ARUB145DTE4 ARUB145DTE4 ARUB096DTE4
34
ARUB408BTE4 ARUB145BTE4 ARUB145BTE4 ARUB121BTE4
3/4"
ARUB408DTE4 ARUB145DTE4 ARUB145DTE4 ARUB121DTE4
36
ARUB432BTE4 ARUB145BTE4 ARUB145BTE4 ARUB145BTE4
ARUB432DTE4 ARUB145DTE4 ARUB145DTE4 ARUB145DTE4
38
ARUB456BTE4 ARUB169BTE4 ARUB145BTE4 ARUB145BTE4
ARUB456DTE4 ARUB169DTE4 ARUB145DTE4 ARUB145DTE4
40
ARUB480BTE4 ARUB169BTE4 ARUB169BTE4 ARUB145BTE4
ARUB480DTE4 ARUB169DTE4 ARUB169DTE4 ARUB145DTE4
42
ARUB504BTE4 ARUB169BTE4 ARUB169BTE4 ARUB169BTE4
ARUB504DTE4 ARUB169DTE4 ARUB169DTE4 ARUB169DTE4
The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations.
• Largest-capacity outdoor units must be the master in a multi-frame system and placed in the position closest to pipe segment "D" in
the figure above.
• Single-compressor outdoor units (72,000 Btu/h capacity) cannot be the master outdoor units 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 separately as detailed on page 146.
For dual-frame systems, the pipe segment connecting the two outdoor unit frames contains a Y-branch connector. The
two pipe segments ("A") that connect the multi-frame Y-branch fitting to each outdoor unit frame must be the same
diameter of the outdoor unit pipe connection.
Similar for triple-frame systems, the pipe segments ("A1, A2, A3") that connect the multi-frame outdoor unit Y-branch
fittings to the outdoor unit frames must also match the outdoor unit frame pipe diameter. Main pipe segment D diam-
eters are sized by LATS. See the table below to properly size the diameter of pipe segment B.