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Pipe Sizing For Arub Series Heat Recovery Systems - LG Multi IV Engineering Manual

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REFRIGERANT PIPING DESIGN
Piping Design Guideline Summary
The following is an example of manual pipe size calculations. Designers are highly encouraged to use LATS instead of manual calculations.

Pipe Sizing for ARUB Series Heat Recovery Systems

Figure 19: Heat Recovery Triple-Frame Connections.
Slave2
A1
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.
Table 38: Heat Recovery Triple-Frame Connection Pipe Sizes.
Size (tons)
Model
ARUB312BTE4
26
ARUB312DTE4
ARUB336BTE4
28
ARUB336DTE4
ARUB360BTE4
30
ARUB360DTE4
ARUB384BTE4
32
ARUB384DTE4
ARUB408BTE4
34
ARUB408DTE4
ARUB432BTE4
36
ARUB432DTE4
ARUB456BTE4
38
ARUB456DTE4
ARUB480BTE4
40
ARUB480DTE4
ARUB504BTE4
42
ARUB504DTE4
• 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.
124 |
Slave1
A2
ARCNB21
(Multi-frame Outdoor Unit
Y-branch Connector)
Master
Slave1
ARUB144BTE4
ARUB096BTE4
ARUB144DTE4
ARUB096DTE4
ARUB144BTE4
ARUB096DTE4
ARUB144DTE4
ARUB096DTE4
ARUB144BTE4
ARUB121BTE4
ARUB144DTE4
ARUB121DTE4
ARUB145BTE4
ARUB145BTE4
ARUB145DTE4
ARUB145DTE4
ARUB145BTE4
ARUB145BTE4
ARUB145DTE4
ARUB145DTE4
ARUB145BTE4
ARUB145BTE4
ARUB145DTE4
ARUB145DTE4
ARUB169BTE4
ARUB145BTE4
ARUB169DTE4
ARUB145DTE4
ARUB169BTE4
ARUB169BTE4
ARUB169DTE4
ARUB169DTE4
ARUB169BTE4
ARUB169BTE4
ARUB169DTE4
ARUB169DTE4
©
Master
A3
B
ARCNB31
(Multi-frame Outdoor Unit
Y-branch Connector)
Slave2
ARUB072BTE4
ARUB072DTE4
ARUB096BTE4
ARUB096DTE4
ARUB096BTE4
ARUB096DTE4
ARUB096BTE4
ARUB096DTE4
ARUB121BTE4
ARUB121DTE4
ARUB145BTE4
ARUB145DTE4
ARUB145BTE4
ARUB145DTE4
ARUB145BTE4
ARUB145DTE4
ARUB169BTE4
ARUB169DTE4
ARCNB21 and ARCNB31
Outdoor Unit Connector
Pipe Accessories
D (main pipe
sized by LATS)
To Heat
Recovery Units
B
Low Pressure
High Pressure
Liquid
Vapor
1-1/8"
5/8"
1-3/8"
3/4"
Vapor
7/8"
1-1/8"

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