LG Multi V PRHR042A Installation Manual page 16

16
WARNING
!
• Always careful not to leak the refrigerant during welding.
• The refrigerant generates poisonous gas harmful to human body
if combusted.
• Do not perform welding in a closed space.
• Be sure to close the cap of the service port to prevent gas
leakage after the work.
CAUTION
!
Please block the pipe knock outs of the front and side panels after
installing the pipes.
(Animals or foreign objects may be brought in to damage wires.)
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 12.7 15.88 19.05
[mm(inch)] (1/4) (3/8) (1/2) (5/8) (3/4)
Minimum
0.8 0.8 0.8 0.99 0.99
thickness
(0.03) (0.03) (0.03) (0.04) (0.04)
[mm(inch)]
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
ARBLN01621, ARBLN03321,
ARBLN07121, ARBLN14521,
ARBLN23220
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 .)
22.2 25.4 28.58 31.8 34.9 38.1 41.3 44.45
(7/8) (1) (1-1/8) (1-1/4) (1-3/8) (1-1/2) (1-5/8) (1-3/4)
0.99 0.99 0.99 1.1 1.21 1.35 1.43 1.55
(0.04) (0.04) (0.04) (0.04) (0.05) (0.05) (0.06) (0.06)
Header
4 branches 7 branches 10 branches
ARBL054 ARBL057 ARBL1010
ARBL104 ARBL107 ARBL2010
A
A To Outdoor Unit
B
Sealed Piping
A
9
The Multi V will stop due to an abnormality like excessive or
53.98
insufficient refrigerant. At such a time, always properly charge the
(2-1/8)
unit. When servicing, always check the notes concerning both the
piping length and the amount of additional refrigerant.
2.1
10
Never perform a pump down. This will not only damage the
(0.08)
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
result 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
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.
B