LG L2-C366BA0, Руководство по установке

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Installation Manual 17
Connecting Pipes to the Indoor Unit
6) Pipe bending
Annealed copper pipe with small diameter (ø6.35 or ø9.52) can be easily bent manually. In this
case, secure large R(radius) for the bend section and gradually bend pipe. If annealed copper
pipe is large in diameter (ø15.88 or ø19.05), bend pipe with bender. Use bender appropriate for
the pipe diameter.
7) Brazing
In refrigerant piping, bending (in particular, acute bending) must be minimized to reduce piping
resistance. Bending is, however, necessary in some places by virtue of the installation position
of devices auxiliary to the packaged air conditioner, or of the building structure, piping distance
or finishing appearance. If a more acute bend is required than that attainable by pipe bender,
perform brazing using ready-made elbow. Aside from this function, brazing also serves to
connect straight pipes, generally using ready-made sockets. While brazing, protect piping
against heat with wet cloth to avoid damaging valve packing or burning thermal insulator with
burner heat. While brazing, blow inert gas (nitrogen gas or carbonic gas) to prevent formation of
oxidation film in copper piping; otherwise, the refrigerant circuit will clog. The blowing of nitrogen
gas (or carbonic gas) through 3-way valves is described in the following:
8) Refrigerant piping(Flare piping)
When connecting piping, be sure to keep piping dry(keep piping away from water), clean (keep
piping away from dust) and airtight (avoid refrigerant leakage).
When connecting piping on rainy days or making a through-hole in wall, take due care to
prevent water or plaster from entering piping.
Water enters Plaster enters
CAUTION:
a. This procedure is designed to
prevent formation of oxidation film
by filling piping with inert gas. Note
that excessive gas pressure will
generate pinholes at brazed points.
(Nitrogen gas: Supply pressure
0.05~0.1kg/cm
2 G)
b. When supplying inert gas, be sure
to open one end of piping.