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Installation of Outdoor Unit, HR Unit, Indoor Unit
Refrigerant Pipe
3 pipes are connected to the HR unit from the outdoor unit, classified
into liquid pipe, low pressure gas pipe and high pressure gas pipe de-
pending on status of refrigerant passing through the pipe.
You must connect 3 pipes from outdoor unit to HR unit.
For connection between indoor unit and HR unit, you must connect
both liquid pipe and gas pipe from the HR unit to the indoor unit. In this
case, connect them to the indoor unit starting from No.1 connection
port of the HR unit (the port number is displayed on ports of the HR
unit). Use auxiliary flare as annexed parts in connection to the indoor
unit.
HR Unit
Low pressure
Gas pipe
High pressure
Liquid pipe
Gas pipe
!
CAUTION
Whenever connecting the indoor units with the HR unit, install the in-
door units in numerical order from No.1.
Ex) In case of installing 3 indoor units : No. 1, 2, 3 (O), No. 1, 2, 4 (X),
No.1, 3, 4 (X), No.2, 3, 4 (X).
Type of HR Unit
Select an HR unit according to the number of the indoor units to be in-
stalled. HR units are classified into 3 types by the number of con-
nectable indoor units.
Ex) Installation of 6 indoor units
Consists of HR unit for 4 branches and HR unit for 2 branches.
2
1
PRHR021(2 branches)
PRHR041(4 branches)
Joint Method of HR Unit (Big Duct : ARNU76GB8-,
ARNU96GB8-)
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.
st
1
HR Unit
1
2
3
4
B8
BG
(96k) (28k)
Gas pipe
Liquid pipe
3 4
1 2
Gas pipe
Liquid pipe
3
2
1
PRHR031(3 branches)
3 4
1 2
nd
2
HR Unit
1
2
3
4
BH
B8
(21k)
(76k)
Liquid pipe
Low pressure gas pipe
High pressure gas pipe
Remove caps on
The brazing part.
HR unit
PRHR021
Low pressure
Ø22.2
gas pipe
High pressure
Ø19.05
gas pipe
Liquid pipe
Ø9.52
Installation of Zoning Control
Some indoor unit can be connected to one port of HR unit.
HR unit
sealing
Zoning control group 1
(Max. 8 Indoor Units)
Changeover under control
Auto changeover
!
WARNING
• A branch pipe of HR unit allows up to 14.1kW based on cooling ca-
pacity of the indoor unit.
(up to 14.1kW (48kBtu/h) for max installation)
• The maximum total capacity of indoor units connected to a
PRHR041 HR unit is 56.4kW
(192 kBtu/h).
• The maximum number of indoor units connected to a PRHR041
HR unit are 32 indoor units. (The Maximum indoor units per a
branch pipe of HR unit are 8 indoor units)
• There is not operate "Auto-changeover" & "Mode override" func-
tion in the zoning group.
• When there are operating indoor units on cooling(heating) mode,
another indoor units aren't changed on heating(cooling) mode in
the zoning group.
13
3 4
1 2
Gas pipe Ø15.88 (5/8)
Liquid pipe Ø9.52 (3/8)
Brazing Type
PRHR031
PRHR041
Ø28.58
Ø28.58
Ø22.2
Ø22.2
Ø12.7
Ø15.88
HR unit
Zoning control group 2
(Max. 8 Indoor Units)
Changeover under control
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