LG ARUB120LTE4, Installation Manual

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13
ENGLISH
Gas pipe Ø15.88 (5/8)
Liquid pipe Ø9.52 (3/8)
Brazing Type
1 2
3 4
Remove caps on
The brazing part.
Liquid pipe
Low pressure gas pipe
High pressure gas pipe
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
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.
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.
HR unit HR unit
sealing
Changeover under control Auto changeover Changeover under control
Zoning control group 1 Zoning control group 2
(Max. 8 Indoor Units)
(Max. 8 Indoor Units)
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.
!
[Reducers for indoor unit and HR unit]
(Unit : mm)
Models
High pressure
–
Gas pipe
Low pressure
Liquid pipe
Indoor unit
reducer
HR unit
reducer
PRHR021A
OD22.2(7/8) Ø19.05(3/4) Ø15.88(5/8)
OD15.88(5/8) Ø12.7(1/2)
Ø6.35(1/4) OD9.52(3/8)
Ø6.35(1/4) OD9.52(3/8)
OD19.05(3/4) Ø15.88(5/8)
OD12.7(1/2) Ø9.52(3/8)
Ø12.7(1/2)
OD22.2(7/8) Ø19.05(3/4) Ø15.88(5/8)
OD15.88(5/8) Ø12.7(1/2)
PRHR031A/
PRHR041A
OD19.05(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) Ø9.52(3/8)
OD15.88(5/8) Ø12.7(1/2)
Outer diameter
[mm]
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
Minimum
thickness [mm]
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
Y branch
Header
4 branch 7 branch 10 branch
ARBLB01621, ARBLB03321,
ARBLB07121, ARBLB14521,
ARBLB23220
ARBL054 ARBL057 ARBL1010
ARBL104 ARBL107 ARBL2010
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 .)
To Outdoor Unit
Sealed Piping
A
A
B
Installation of Zoning Control
Some indoor unit can be connected to one port of HR unit.