LG ARUB230BT2 Installation Manual page 30

Refrigerant piping installation
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
Outer diameter
[mm(inch)]
Minimum thickness
[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.
ARBLB01620
ARBLB07120
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. 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 pipe length and the
amount of additional refrigerant.
9. Never use refrigerant to perform an air purge. Always evacuate using a vacuum pump.
10. Always insulate the piping properly. Insufficient insulation will result in a decline in heating/cooling perfor-
mance, drip of condensate and other such problems.
11. 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.
12. 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 compressors and flux can harm the copper piping or refrigerant oil.
13. Diameter of the refrigerant pipe from the HR unit to the indoor unit is determined by capacity of the
indoor unit. The pipe port is installed to suit a large capacity of the indoor unit for the connection flare of
the HR unit. It is sufficient to cut, connect and install the subsidiary flare to suit the pipe of the indoor unit
connected.
14. Take care so that there is no thermal damage on the service valves of the outdoor unit.
(Especially packing part of service port.) Wrap the service valve with a wet towel when brazing it.
30 30 Outdoor Unit Outdoor Unit
3.8MPa. We recommend the following table as the minimum wall thickness.
6.35(1/4) 9.52(3/8)
0.8(0.03) 0.8(0.03)
Y branch
ARBLB03320
ARBLB14520
12.7(1/2) 15.88(5/8) 19.05(3/4)
0.8(0.03) 0.99(0.03) 0.99(0.03)
22.2(7/8) 25.4(1)
0.99(0.03) 0.99(0.03)