LG ARUB80LT2 Installation Manual page 26

Refrigerant piping installation
Type of HR Unit
Select an HR unit according to the number of the indoor units to be installed. HR units are classified into 3 types
by the number of connectable indoor units.
Ex) Installation of 6 indoor units
Consists of HR unit for 4 rooms and HR unit for 2 rooms.
PRHR020(2 rooms)
Joint Method of HR Unit (Big Duct : URNU76GB8-, URNU96GB8-)
Joint Method is required when B5/B8 chassis is installed. In Joint Method, two neighboring outlets of
one HR unit are linked by Y branch pipe and connected to one indoor unit.
WARNING
• 1 port of HR unit allows up to 14.1kW based on cooling capacity of the indoor unit (up to 14.1kW
(48kBtu/hr) for max installation).
• The maximum total capacity of the indoor units connected to one PRHR040 HR unit is 47kW
(160kBtu/hr). In case of installation of four indoor units of 14.1kW (48kBtu/hr), use two PRHR020's
rather than one PRHR040.
Liquid pipe
Low pressure gas pipe
High pressure gas pipe
Remove caps on
The brazing part.
HR unit
Low pressure gas pipe
High pressure gas pipe
Liquid pipe
26 Outdoor Unit
2
1
st
1 HR Unit
1 2 3 4
B5 BG
(96k) (28k)
PRHR020
Ø22.2
Ø19.05
Ø9.52
3
2
1
PRHR030(3 rooms)
nd
2 HR Unit
1 2 3 4
BH B5
(21k) (76k)
PRHR030
Ø28.58
Ø22.2
Ø12.7
1 2
PRHR040(4 rooms)
3 4
1 2
Gas pipe Ø15.88
Liquid pipe Ø9.52
Brazing Type
PRHR040
Ø28.58
Ø22.2
Ø12.7(Before 2011.4.1 Product)
Ø15.88(After 2011.4.1 Product)
4
3
(Unit: mm)