28 Outdoor Unit
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 branches and HR unit for 2 branches.
PRHR031(3 branches)PRHR021(2 branches) PRHR041(4 branches)
1
2
3
1
2
1
3
2
4
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
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
B8
(96k) (28k)
BG
1
2
3
4
B8
(76k)(21k)
BH
HR unit
PRHR021
PRHR031
PRHR041
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
Ø15.88
Refrigerant piping installation
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