LG LV-C362FLA0 Svc Manual page 26

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, pro-
tect 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 cop-
per 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 plas-
ter from entering piping.
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
b. When supplying inert gas, be sure to open one end
of piping.
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Only for training and service purposes
G)
2
Water enters
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Plaster enters
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