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
mu
st
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 hlbing
s.
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 fmger
s.
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
(11
4
")
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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