Refrigerant Piping Installation - LG MULTI V Installation Manual

Refrigerant piping installation

Refrigerant piping installation
Precautions on Pipe connection / Valve operation
Pipe connection is done by connecting from the end of the pipe to the
branching pipes, and the refrigerant pipe coming out of the outdoor
unit is divided at the end to connect to each indoor unit. Flare connec-
tion for the indoor unit, and welding connection for the outdoor pipe
and the branching parts.
• Use hexagonal wrench to open/close the valve.
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 the cables.)
High Low Pressure Common Pipe Connections
1. For High Low Pressure Common Pipe, use provided elbows to
connect between the outdoor units using pipes.
2. During the cutting of the pipes, remove burr, foreign substances
before connecting. Otherwise, the unit may not operate because
of the sludge inside the pipe.
3. Apply Nitrogen Gas of pressure until 551.1psi(38.7kgf/cm²) for
work area leakage test.
4. After the degree of a vacuum reaches 0.097psi(5torr), continue the
vacuuming work for more than 1 hour.
5. Open the side pole with hexagonal wrench.
h When connecting to high low pressure com-
mon pipe, connect pipes using connecting
elbows.
Detach knock outs according
the usages.
24 Outdoor Unit
Gas pipe
Liquid pipe
Common pipe
Installing on the front side
Installing 2 units
Installing 3 units
Detach
knock outs
according
the usages.
Installing on the side(Limited to high
low pressure common pipe)