Type Of Hr Unit; Installation Of Zoning Control - LG MULTI V S ARUB060GSS4 Installation Manual

14

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 10 indoor units
Consists of HR unit for 8 branches and HR unit for 2 branches.
2 1
PRHR023(A)(2 branches)
2 1
4 3
PRHR043(A)(4 branches)
PRHR083(A)(8 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
4 3 2 1
BG B8
(38k) (92k)
High pressure
gas pipe
Liquid pipe
Low pressurse
gas pipe
(Brazing Type)
HR unit PRHR023(A)
Low pressure
Ø22.2(7/8)
gas pipe
High pressure
Ø19.05(3/4)
gas pipe
Liquid pipe Ø9.52(3/8)
1
3 2
PRHR033(A)(3 branches)
2 1
4 3
6 5
PRHR063(A)(6 branches)
2 1
4 3
6 5
8 7
nd
2 HR Unit
4 3 2 1
BH B8
(48k) (72k)
Gas pipe Ø15.88– Ø12.7
Liquid pipeØ9.52– Ø6.35
Brazing Type
PRHR043(A)
PRHR033(A) PRHR063(A)
PRHR083(A)
Ø28.58(1-1/8) Ø28.58(1-1/8)
Ø22.2(7/8) Ø22.2(7/8)
Ø12.7(1/2) Ø15.88(5/8)

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 14.5kW(48kBtu/h) based on
cooling capacity of the indoor unit. (up to 14.5kW(48kBtu/h) for
max installation)
• The maximum total capacity of indoor units connected to a
PRHR042(A) HR unit is 58kW(192kBtu/h).
• The maximum number of indoor units connected to a
PRHR042(A) 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.
For detailed instructions on installing the HR Unit, see the installation
manual included with the HR Unit.
[Reducers for indoor unit and HR unit]
Models
Liquid pipe
Indoor unit
reducer
OD9.52(3/8) Ø6.35(1/4)
PRHR023(A)
OD9.52(3/8) Ø6.35(1/4)
HR unit
reducer
PRHR033(A)/
PRHR043(A)/
OD15.88(5/8)
Ø12.7(1/2) Ø9.52(3/8)
PRHR063(A)/
PRHR083(A)
OD12.7(1/2) Ø9.52(3/8)
HR unit
Zoning control group 2
(Max. 8 Indoor Units)
Changeover under control
Unit : mm(inch)
Gas pipe
High pressure Low pressure
-
OD15.88(5/8) Ø12.7(1/2)
OD19.05(3/4) Ø15.88(5/8) Ø12.7(1/2) OD22.2(7/8) Ø19.05(3/4) Ø15.88(5/8)
OD12.7(1/2) Ø9.52(3/8)
OD15.88(5/8) Ø12.7(1/2)
OD22.2(7/8) Ø19.05(3/4) Ø15.88(5/8)
OD28.58(1-1/8) Ø22.2(7/8) Ø19.05(3/4)
OD15.88(5/8) Ø12.7(1/2)
OD19.05(3/4) Ø15.88(5/8)