23
TM-FT
-0415-B
Remove burr
Cutting copper tube
1/4t
Flared tube
Flare joint
Flare nut
Indoor piping
Torque wrench
Spanar
Ø Tube, D
A (mm)
Inch mm
Imperial
(Wing-nut Type)
Rigid
(Clutch Type)
1/4"
6.35
1.3
0.7
3/8"
9.52
1.6
1.0
1/2" 12.70
1.9
1.3
5/8" 15.88
2.2
1.7
3/4" 19.05
2.5
2.0
Pipe Size
(mm/in)
Torque
(Nm/ft-lb)
6.35 (1/4")
18 (13.3)
9.52 (3/8")
42 (31.0)
12.70 (1/2")
55 (40.6)
15.88 (5/8")
65 (48.0)
19.05 (3/4")
78 (57.6)
Figure D
Figure A
Copper tube
Swaging block
A
D
Figure B
Figure C
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, fittings, tubing 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. 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 A.
• Remove burrs from cut edges of the pipes with
remover. See Figure B. 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 flare faces which
will cause gas leak.
• Insert the flare 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 flaring tool. See Figure C.
• Fix the pipe firmly on the swaging block. Match the
centers of both the swaging block and the flaring
punch, then tighten the flaring punch fully.
Piping Connection To The Units
• Align the center of the piping and tighten the
flare nut sufficiently with fingers. See Figure D.
• 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 connection are insulated by
closed cell polyurethane.
