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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, rubber plugs
and brass nuts from the valves, fi ttings, tubing and coils
until it is ready to connect suction or liquid line into valves
or fi ttings.
•
If any brazing work is required, ensure that nitrogen gas
is passed through coil and joints while the brazing work is
being done. This will eliminate soot formation on the inside
wall of copper tubings.
•
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 D.
•
Remove burrs from cut edges of the pipes with remover. See
Figure E. Hold the pipe on top position and burr remover
at lower position to prevent metal chips from entering the
pipe. This will avoid unevenness on the fl are faces which
will cause gas leak.
•
Insert the fl are nuts, mounted on the connection parts of both
the indoor unit and outdoor unit, into the copper pipes.
•
The exact length of pipe protruding from the top surface
of the swaging block is determined by the fl aring tool. See
Figure F.
•
Fix the pipe fi rmly on the swaging block. Match the centers
of both the swaging block and the fl aring punch, then tighten
the fl aring punch fully.
•
The refrigerant pipe connection are insulated by closed cell
polyurethane.
Piping Connection To The Units
•
Align the center of the piping and suffi ciently tighten the
fl are nut with fi ngers. See Figure G.
•
Finally, tighten the fl are nut with torque wrench until the
wrench clicks.
•
When tightening the fl are nut with the torque wrench,
ensure that the direction for tightening follows the arrow
on the wrench.
•
The refrigerant pipe connection are insulated by closed cell
polyurethane.
Pipe Size,
(mm/in)
6.35 (1/4")
9.52 (3/8")
12.70 (1/2")
15.88 (5/8")
19.05 (3/4")
Torque,
(Nm/ft-lb)
18 (13.3)
42 (31.0)
55 (40.6)
65 (48.0)
78 (57.6)
1-12
Figure D
Cutting Copper Tube
1/4t
Copper Tube
Figure E
Remove Burr
Figure F
Copper Tube
Swaging Block
Ø Tube, D
Imperial
Inch
mm
(Wing-nut Type)
1/4"
6.35
3/8"
9.52
1/2"
12.70
5/8"
15.88
3/4"
19.05
Figure G
Flare Joint
Indoor Piping
Spanar
D
A (mm)
Rigid
(Clutch Type)
1.3
0.7
1.6
1.0
1.9
1.3
2.2
1.7
2.5
2.0
Flared Tube
Flare Nut
Torque Wrench
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