Pipe Sizing For Arun Series Heat Pump Systems; Heat Pump Triple-Frame Connections - LG Multi IV Engineering Manual

REFRIGERANT PIPING DESIGN
Piping Design Guideline Summary

Pipe Sizing for ARUN Series Heat Pump Systems

Figure 18: Heat Pump Triple-Frame Connections.
Slave2
A1
A2
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 33: Heat Pump Triple-Frame Connection Pipe Sizes.
Size (tons)
ARUN312BTE4
26
ARUN312DTE4
ARUN336BTE4
28
ARUN336DTE4
ARUN360BTE4
30
ARUN360DTE4
ARUN384BTE4
32
ARUN384DTE4
ARUN408BTE4
34
ARUN408DTE4
ARUN432BTE4
36
ARUN432DTE4
ARUN456BTE4
38
ARUN456DTE4
ARUN480BTE4
40
ARUN480DTE4
ARUN504BTE4
42
ARUN504DTE4
• 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.
120 |
Slave1
A3
ARCNN21
B
(Multi-frame Outdoor Unit
Y-branch Connector)
Model Master
ARUN144BTE4
ARUN144DTE4
ARUN144BTE4
ARUN144DTE4
ARUN144BTE4
ARUN144DTE4
ARUN145BTE4
ARUN145DTE4
ARUN145BTE4
ARUN145DTE4
ARUN145BTE4
ARUN145DTE4
ARUN169BTE4
ARUN169DTE4
ARUN169BTE4
ARUN169DTE4
ARUN169BTE4
ARUN169DTE4
©
Master
ARCNN21 and ARCNN31
Outdoor Unit Connector
Pipe Accessories
D (main pipe
sized by LATS)
ARCNN31
(Multi-frame Outdoor Unit
Y-branch Connector)
Slave1
ARUN096BTE4
ARUN096DTE4
ARUN096DTE4
ARUN096DTE4
ARUN121BTE4
ARUN121DTE4
ARUN145BTE4
ARUN145DTE4
ARUN145BTE4
ARUN145DTE4
ARUN145BTE4
ARUN145DTE4
ARUN145BTE4
ARUN145DTE4
ARUN169BTE4
ARUN169DTE4
ARUN169BTE4
ARUN169DTE4
To Indoor Units
Slave2
Liquid
ARUN072BTE4
ARUN072DTE4
ARUN096BTE4
ARUN096DTE4
5/8"
ARUN096BTE4
ARUN096DTE4
ARUN096BTE4
ARUN096DTE4
ARUN121BTE4
ARUN121DTE4
ARUN145BTE4
ARUN145DTE4
ARUN145BTE4
3/4"
ARUN145DTE4
ARUN145BTE4
ARUN145DTE4
ARUN169BTE4
ARUN169DTE4
B
Vapor
1-1/8"
1-3/8"