Caution; Pipe Connections Between Indoor And Outdoor Unit; Preparation Work; Pipe Drawing Out During Single / Series Connection - LG Multi V IV PRHR041 Installation Manual

14
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 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

Preparation Work

- Use Knock Outs of Base Pan of the outdoor unit for Left/Right or
Bottom pipe drawing outs.
Removal Area for Liquid/Gas pipe
bottom side connections.

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.
Remove leakage prevention cap
• Remove the leakage prevention cap attached to the outdoor unit
service valve before pipe work.
• Proceed the leakage prevention cap removal as follows:
- Verify whether the liquid/gas pipes are locked.
- Extract remaining refrigerant or air inside using the service port.
- Remove the leakage prevention cap
Liquid pipe
Low Pressure Gas pipe
High Pressure Gas pipe
Leakage Prevention Cap

Pipe Drawing Out during Single / Series connection

Method of drawing out pipes on the front side
- Proceed with the pipe work as shown in the below figure for front
side pipe drawing out.
Pipe Knock Out for
Liquid/Gas pipes
Pipe Knock Out
for High Pressure
Gas pipe
Service Port
Refrigerant Charging Port
80mm
(3.15in)