LG ZRUM080LTS6 Installation Manual page 22

22
Caution
1
Use the following materials for refrigerant piping.
- Material: Seamless phosphorous deoxidized copper pipe
- Wall thickness : Comply with the relevant local and national
regulations for the designed pressure 3.8 MPa
(551 psi). We recommend the following table as
the minimum wall thickness.
Outer diameter 6.35 9.52
[mm(inch)] (1/4) (3/8)
Minimum thickness 0.8 0.8
[mm(inch)] (0.03) (0.03)
Outer diameter 28.58 31.8
[mm(inch)] (1-1/8) (1-1/4)
Minimum thickness 0.99 1.1
[mm(inch)] (0.04) (0.04)
2
Commercially available piping often contains dust and other
materials. 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
separately.
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
heating/cooling performance.
8
A second branch cannot be made after a header.
(These are shown by .)
A
A To Outdoor Unit
B
Sealed Piping
A
12.7 15.88 19.05 22.2
(1/2) (5/8) (3/4) (7/8)
0.8 0.99 0.99 0.99
(0.03) (0.04) (0.04) (0.04)
34.9 38.1 41.3 44.45
(1-3/8) (1-1/2) (1-5/8) (1-3/4)
1.21 1.35 1.43 1.55
(0.05) (0.05) (0.06) (0.06)
Header
4 branches 7 branches 10 branches
ARBL054 ARBL057 ARBL1010
ARBL104 ARBL107 ARBL2010
B
9
The Multi V will stop due to an abnormality like excessive or
insufficient 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
compressor 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
25.4
result in a decline in heating/cooling performance, drip of
(1)
condensate and other such problems.
0.99
13
When connecting the refrigerant piping, make sure the service
(0.04)
valves of the Outdoor Unit is completely closed (the factory
53.98
setting) and do not operate it until the refrigerant piping for the
(2-1/8)
Outdoor and Indoor Units has been connected, a refrigerant
leakage test has been performed and the evacuation process has
2.1
(0.08) 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
damage 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 damaged.
• After selecting diameter of the refrigerant pipe to suit total
capacity 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.