LG MULTI V S ARUN060GSS4 Installation Manual page 12

12
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
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 set-
ting) and do not operate it until the refrigerant piping for the Out-
door 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 refriger-
ant, the refrigerant cycle may malfunction and the unit may be
damaged.
• After selecting diameter of the refrigerant pipe to suit total ca-
pacity of the indoor unit connected after branching, use an ap-
propriate branch pipe set according to the pipe diameter of the
indoor unit and the installation pipe drawing.
PIPE CONNECTIONS BETWEEN
INDOOR AND OUTDOOR UNIT
3, 4, 4.4, 5, 6, 8 Ton
- Pipe connections can be done on the front side or on the side accord-
ing to the installation environments.
- Be sure to let 0.2kgf/cm
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.
Front Pipe
Draw Out
B
Bottom Side Pipe
Draw Out
Preparation Work
- Use Knock Outs of Cover of the outdoor unit for Front/Right or Rear
pipe drawing outs.
- Use the wet towel as shown in the below figure before welding
CAUTION
!
• Do not give damage to the pipe/base during the Knock Out work.
• Proceed to pipe work after removing burr after Knock Out work.
• Perform sleeve work to prevent damage to the wire when con-
necting wires using Knock Outs.
2 2
(0.284lbs/in ) Nitrogen flow in the pipe when
Refrigerant Pipe
Nitrogen Nitrogen Nitrogen
Direction Direction Direction
Taping
Rear Side Pipe
Draw Out
Right Side Pipe
Draw Out
Removal Area for Liquid/Gas
pipe bottom side connections.
Wet towel
<Liquid pipe> <Gas pipe>
Regulator
Valve
Nitrogen