Caution; Pipe Connections Between Indoor And Outdoor Unit - LG MULTI V IV ARUB080BTE4 Installation Manual

14
[Reducers for indoor unit and HR unit]
Models
Liquid pipe
Indoor unit
reducer
OD9.52(3/8) ID6.35(1/4)
PRHR021A
OD9.52(3/8) ID6.35(1/4)
HR unit
reducer
PRHR031A/
PRHR041A
OD15.88(5/8) ID12.7(1/2) ID9.52(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) ID12.7(1/2)
OD19.05(3/4) ID15.88(5/8) ID12.7(1/2)
OD22.2(7/8) ID19.05(3/4) ID15.88(5/8)
OD12.7(1/2) ID9.52(3/8)
OD15.88(5/8) ID12.7(1/2)
OD22.2(7/8) ID19.05(3/4) ID15.88(5/8)
OD28.58(1-1/8) ID22.2(7/8) ID19.05(3/4)
OD15.88(5/8) ID12.7(1/2)
OD19.05(3/4) ID15.88(5/8)
Header
4 branch 7 branch 10 branch
ARBL054 ARBL057 ARBL1010
ARBL104 ARBL107 ARBL2010
A
9. The Multi V will stop due to an abnormality like excessive or insuffi-
cient refrigerant. At such a time, always properly charge the unit.
When servicing, always check the notes concerning both the piping
length and the amount of additional refrigerant.
10. Never perform a pump down. This will not only damage the com-
pressor but also deteriorate the performance.
11. Never use refrigerant to perform an air purge. Always evacuate air
by using a vacuum pump.
12. Always insulate the piping properly. Insufficient insulation will re-
sult in a decline in heating/cooling performance, drip of condensate
and other such problems.
13. When connecting the refrigerant piping, make sure the service
valves of the Outdoor Unit is completely closed (the factory setting)
and do not operate it until the refrigerant piping for the Outdoor and
Indoor Units has been connected, a refrigerant leakage test has
been performed and the evacuation process has been completed.
14. Always use a non-oxidizing brazing material for brazing the parts
and do not use flux. If not, oxidized film can cause clogging or dam-
age to the compressor unit and flux can harm the copper piping or
refrigerant oil.
! WARNING
When installing and moving the air conditioner to another site, be
sure to make recharge refrigerant after perfect evacuation.
• If a different refrigerant or air is mixed with the original refrigerant,
the refrigerant cycle may malfunction and the unit may be dam-
aged.
• After selecting diameter of the refrigerant pipe to suit total capac-
ity of the indoor unit connected after branching, use an appropriate
branch pipe set according to the pipe diameter of the indoor unit
and the installation pipe drawing.
PIPE CONNECTIONS BETWEEN
INDOOR AND OUTDOOR UNIT
- Pipe connections can be done on the front side or on the side accord-
ing to the installation environments.
2
- Be sure to let 0.2kgf/cm Nitrogen flow in the pipe when welding.
- If Nitrogen was not flown during welding, many oxidized membranes
may form inside the pipe and disturb the normal operations of valves
and condensers.
Right
Side Pipe
Draw Out
Left Side
Pipe Draw
Out
Front Pipe Draw Out
B
Regulator
Refrigerant Pipe
Nitrogen Nitrogen Nitrogen
Direction Direction Direction
Taping
Valve
Nitrogen