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
(ø12.7, 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
or
of
the
building
structure, piping distance or finishing appearance.
Perform brazing using ready-made elbow. Aside from this function, brazing
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.
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
2
0.05~0.1kg/cm G)
b. When supplying inert gas, be sure to open
one end of piping.
Water enters
Plaster enters
13
Summary of Contents for JB-B2156QC
Page 29: ...B Remote Control Preparation 29 ...
Page 40: ......
