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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
depending 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.
High Pressure
Gas Pipe
HR Unit
Low Pressure
Liquid pipe
Gas Pipe
Pipe connection
From left side
CAUTION
!
Whenever connecting the indoor units with the HR unit, install the
indoor 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
installed. HR units are classified into 5 types by the number of
connectable indoor units.
PRHR023 (2 branches), PRHR033 (3 branches), PRHR043 (4 branches),
PRHR063 (6 branches), PRHR083 (8 branches)
Joint Method of HR Unit (Big Duct : ARNU76GB8-,
ARNU763B8-, ARNU96GB8-, ARNU963B8-)
Joint Method is required when the big duct 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
4 3 2
1
BG
B8
(38 k)
(96 k)
Gas pipe
Liquid pipe
3 4
1 2
Gas pipe
Liquid pipe
Pipe connection
From right side
Parallel pipe
connection
nd
2
HR Unit
4 3 2
1
BH
B8
(48 k)
(76 k)
High pressure
gas pipe
Liquid pipe
Low pressurse
gas pipe
(Brazing Type)
HR unit
PRHR023
Low pressure
Ø 22.2 (7/8)
gas pipe
High pressure
Ø 19.05 (3/4)
gas pipe
Liquid pipe
Ø 9.52 (3/8)
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 17.6 kW (60 kBtu/h) based
on cooling capacity of the indoor unit.
(up to 17.6 kW (60 kBtu/h) for max installation)
• The maximum total capacity of indoor units connected to a
PRHR083 HR unit is 67.4 kW (230 kBtu/h).
• The maximum number of indoor units connected to a PRHR083
HR unit are 64 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"
function 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.
[Reducers for HR unit]
Type of HR unit
Liquid pipe
2 port
OD 9.52(3/8)
Ø 6.35(1/4)
HR unit
reducer
3 port
4 port
OD 15.88(5/8) Ø 12.7(1/2) Ø 9.52(3/8)
6 port
8 port
OD 12.7(1/2) Ø 9.52(3/8)
Gas pipe Ø 15.88 – Ø 12.7
Liquid pipe Ø 9.52 – Ø 6.35
Brazing Type
[Unit : mm (inch)]
PRHR043
PRHR033
PRHR063
PRHR083
Ø 28.58 (1-1/8)
Ø 28.58 (1-1/8)
Ø 22.2 (7/8)
Ø 22.2 (7/8)
Ø 12.7 (1/2)
Ø 15.88 (5/8)
HR unit
Zoning control group 2
(Max. 8 Indoor Units)
Changeover under control
[Unit : mm (inch)]
Gas pipe
High pressure
Low pressure
Ø 12.7(1/2) OD 22.2(7/8) Ø 19.05(3/4) Ø 15.88(5/8)
OD 19.05(3/4) Ø 15.88(5/8)
OD 12.7(1/2) Ø 9.52(3/8)
OD 15.88(5/8) Ø 12.7(1/2)
OD 22.2(7/8) Ø 19.05(3/4) Ø 15.88(5/8)
OD 28.58(1-1/8) Ø 22.2(7/8) Ø 19.05(3/4)
OD 19.05(3/4) Ø 15.88(5/8)
OD 15.88(5/8) Ø 12.7(1/2)
21
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