LG Multi IV - Heat Pump Triple-Frame Connections; Pipe Sizing for ARUN Series Heat Pump Systems

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MULTI V IV Outdoor Unit Engineering Manual
REFRIGERANT PIPING DESIGN
Table 33: Heat Pump Triple-Frame Connection Pipe Sizes.
Figure 18: Heat Pump Triple-Frame Connections.
Piping Design Guideline Summary
Size (tons) Model Master Slave1 Slave2
B
Liquid Vapor
26
ARUN312BTE4 ARUN144BTE4 ARUN096BTE4 ARUN072BTE4
5/8"
1-1/8"
ARUN312DTE4 ARUN144DTE4 ARUN096DTE4 ARUN072DTE4
28
ARUN336BTE4 ARUN144BTE4 ARUN096DTE4 ARUN096BTE4
ARUN336DTE4 ARUN144DTE4 ARUN096DTE4 ARUN096DTE4
30
ARUN360BTE4 ARUN144BTE4 ARUN121BTE4 ARUN096BTE4
ARUN360DTE4 ARUN144DTE4 ARUN121DTE4 ARUN096DTE4
32
ARUN384BTE4 ARUN145BTE4 ARUN145BTE4 ARUN096BTE4
1-3/8"
ARUN384DTE4 ARUN145DTE4 ARUN145DTE4 ARUN096DTE4
34
ARUN408BTE4 ARUN145BTE4 ARUN145BTE4 ARUN121BTE4
3/4"
ARUN408DTE4 ARUN145DTE4 ARUN145DTE4 ARUN121DTE4
36
ARUN432BTE4 ARUN145BTE4 ARUN145BTE4 ARUN145BTE4
ARUN432DTE4 ARUN145DTE4 ARUN145DTE4 ARUN145DTE4
38
ARUN456BTE4 ARUN169BTE4 ARUN145BTE4 ARUN145BTE4
ARUN456DTE4 ARUN169DTE4 ARUN145DTE4 ARUN145DTE4
40
ARUN480BTE4 ARUN169BTE4 ARUN169BTE4 ARUN145BTE4
ARUN480DTE4 ARUN169DTE4 ARUN169DTE4 ARUN145DTE4
42
ARUN504BTE4 ARUN169BTE4 ARUN169BTE4 ARUN169BTE4
ARUN504DTE4 ARUN169DTE4 ARUN169DTE4 ARUN169DTE4
• 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.
ARCNN21 and ARCNN31
Outdoor Unit Connector
Pipe Accessories
To Indoor Units
Slave2
Master
Slave1
A1
A2
ARCNN21
(Multi-frame Outdoor Unit
Y-branch Connector)
B
A3
D (main pipe
sized by LATS)
ARCNN31
(Multi-frame Outdoor Unit
Y-branch Connector)
Pipe Sizing for ARUN Series Heat Pump Systems