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REFRIGERANT PIPING
Piping
Works
And Flaring Technique
Do
not
use
contaminated
or
damaged copper
tubing. If
any
piping, evaporator or condenser had been exposed or
had been opened for
15
seconds
or
more, the
system
must
be
vacuumed.
Generally do
not
remove
plastic,
mbber
plugs and brass
nuts
from the valves,
fittings,
hlbing
and
coils
until it is
ready to connect suction
or
liquid line
into
valves
or
fittings.
If any brazing work
is
required,
ensure that nitrogen gas
is
passed through coil and
joints
while the brazing work
is
being
done.
lltis
will eliminate soot fonnation on the
inside
wall of copper
hlbings.
Cut the
pipe
stages by
stages,
advancing the blade of pipe
cutter
slowly. Extra
force and a deep cut will cause more
distortion of
pipe
and
therefore
extra burr. See
Figure I.
Remove
burrs
from
cut edges of
the
pipes with remover. See
Figure II. Hold the
pipe
on
top
position and burr remover
at lower
position
to
prevent
metal
chips from entering the
pipe.
TIus
will avoid
unevenness
on the
flare
faces wluch
will cause gas
leak.
Insert
the flare
nuts,
mounted
on the connection
parts
of
both the
indoor
mut
and
outdoor mut,
into
the copper
pipes.
TIle
exact
length
of pipe
protmding
from the
top surface
of
the swaging
block
is determined
by the
flaring
tool.
See
Figure III.
Fix
the
pipe fmuly
on the
swaging
block. Match the centers
of
both
the
swaging block and
the flaring
punch,
then
tighten the
flaring punch
fully.
TIlC
refrigerant
pipe connection
arc
insulatcd
by closed
cell polyurethane.
Piping
Connection
To
The
Units
Align
the
center of
the
piping and tighten the
flare nut
sufficiently
with
fmgers.
See Figure IV.
Finally,
tighten
the
flare nut
with torque wrench
until
the
wrench clicks.
When
tightening the flare nut
with
the torque
wrench,
ensure that the
tightening
direction follows the arrow
indicated on
the wrench.
The refrigerant
pipe cOimection are
insulated
by closed
cell polyurethane.
Pipe
Size,
mm
(in)
Torque,
NmJ(ft,lb)
6.35
(114
")
IS
(13.3)
9.52 (3/S")
42 (31.0)
12.70
(112")
55 (40.6)
15.SS
(5/S")
65 (4S.0)
19.05
(3/4")
7S
(57.6)
I-ll
Figun'" I
Cutting
Copper
Tube
~
1I4'~\Y;::
~
----
"
'
.;','
,
.
Figun'" II
Remove
Burr
Figun'" III
CoppcrTube
0
sw"m_l1~
,
~!
,
o
Tube,
D
A
(mm)
Inch
mm
Imperial
Rigid
(Wing-nut Type)
(Clutch
Type)
114"
6.35
1.3
0.7
3/8"
9.52
1.6
1.0
112"
12.70
1.9
1.3
5/S"
15.SS
2.2
1.7
3/4"
19.05
2.5
2.0
Figun'"IV
Flare
Joint
flared Tube
~~
Indoor
Piping
Flare
Nut
~
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