LG ARWB80LA2 - Page 24

24 Outside 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.
Type of HR Unit
PRHR030(3 rooms)PRHR020(2 rooms) PRHR040(4 rooms)
1
2
3
1
2
1
3
2
4
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.
Gas pipe Ø15.88
Liquid pipe Ø9.52
Brazing Type
1
2
3
4
Remove caps on
The brazing part.
Liquid pipe
Low pressure gas pipe
High pressure gas pipe
HR unit PRHR020 PRHR030 PRHR040
Low pressure gas pipe Ø22.2 Ø28.58 Ø28.58
High pressure gas pipe Ø19.05 Ø22.2 Ø22.2
Liquid pipe Ø9.52 Ø12.7 Ø12.7
(Unit: mm)
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.
1
st
HR Unit 2
nd
HR Unit
1 2 3 4
B5
(96k) (28k)
BG
1 2 3 4
B5
(76k)(21k)
BH