Installation Of Zoning Control - LG Multi V IV PRHR041 Installation Manual

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.
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
[Reducers for indoor unit and HR unit]
Models
Liquid pipe
Indoor unit
reducer
OD9.52(3/8) Ø6.35(1/4)
PRHR021A
OD9.52(3/8) Ø6.35(1/4)
HR unit
reducer
PRHR031A/
PRHR041A
OD15.88(5/8) Ø12.7(1/2) Ø9.52(3/8)
Caution
1
Use the following materials for refrigerant piping.
- Material: Seamless phosphorous deoxidized copper pipe
- Wall thickness : Comply with the relevant local and national regula-
tions for the designed pressure 3.8MPa. We rec-
ommend the following table as the minimum wall
thickness.
Outer diameter
6.35 9.52 12.7 15.88 19.05 22.2 25.4 28.58 31.8 34.9 38.1 41.3 44.45 53.98
[mm]
Minimum
0.8 0.8 0.8 0.99 0.99 0.99 0.99 0.99 1.1 1.21 1.35 1.43 1.55 2.1
thickness [mm]
2
Commercially available piping often contains dust and other materi-
als. Always blow it clean with a dry inert gas.
3
Use care to prevent dust, water or other contaminants from entering
the piping during installation.
4
Reduce the number of bending portions as much as possible, and
make bending radius as big as possible.
5
Always use the branch piping set shown below, which are sold sep-
arately.
Y branch
ARBLB01621, ARBLB03321,
ARBLB07121, ARBLB14521,
ARBLB23220
6
If the diameters of the branch piping of the designated refrigerant
piping differs, use a pipe cutter to cut the connecting section and
then use an adapter for connecting different diameters to connect
the piping.
7
Always observe the restrictions on the refrigerant piping (such as
rated length, difference in height, and piping diameter).
Failure to do so can result in equipment failure or a decline in heat-
ing/cooling performance.
8
A second branch cannot be made after a header. (These are shown
by .)
A
To Outdoor Unit
A
B
Sealed Piping
(Unit : mm)
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)
Header
4 branch 7 branch 10 branch
ARBL054 ARBL057 ARBL1010
ARBL104 ARBL107 ARBL2010
13