Daikin FTXK09P Manuel D'installation page 15

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 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. 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 III.
• 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 tighten the fl are nut
suffi ciently with fi ngers. See Figure IV.
• 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 tightening direction follows the arrow
indicated on the wrench.
• The refrigerant pipe connection are insulated by closed
cell polyurethane.
Pipe Size, in (mm)
1/4" (6.35)
3/8" (9.52)
1/2" (12.70)
5/8" (15.88)
3/4" (19.05)
REFRIGERANT PIPING
Torque, ft-lb (Nm)
13.3 (18)
31.0 (42)
40.6 (55)
48.0 (65)
57.6 (78)
1-13
Figure I
Cutting Copper Tube
1/4t
Figure II
Remove Burr
Figure III
Copper Tube
Swaging Block
Figure IV
Flare Joint
Indoor Piping
Spanner
D
Flared Tube
Flare Nut
Torque Wrench