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INSTALLATION
20
Outside diameter
(mm/inch)
6.35 (1/4)
9.52 (3/8)
12.7 (1/2)
15.88 (5/8)
19.05 (3/4)
Firmly hold copper tube in a bar (or die) as
indicated dimension in the table above.
5
Check
• Compare the flared work with figure.
If flare is noted to be defective, cut off the
flared section and do flaring work again.
a
Smooth all round
Inside is shining without scratches.
b
Even length all round
c
d
Improper flaring
e
Inclined
Surface damaged
f
g
Cracked
h
Uneven thickness
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
"A"
0 ~ 0.5
0.5 ~ 0.8
0.5 ~ 0.8
0.8 ~ 1.0
1.0 ~ 1.3
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
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
file in copper piping; otherwise, the refrigerant
circuit will clog. The blowing of nitrogen gas (or
carbonic gas) through 3-way valves are
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 form 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
a
b
Plaster enters
CAUTION
• This procedure is designed to prevent formation
of oxidation file by filling piping with inert gas.
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