Daikin C-Serie Installationshandbuch Seite 14

Piping Works And Flaring Technique
• Do not use contaminated or damaged copper tubing. If any pipings, 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, tubings
and coils until it is ready to connect suction or liquid line into valves or fittings.
• If any brazing work is required, ensure that the nitrogen gas is passed through coil and joints
while the brazing work is being done. This will eliminate soot formation on the inside walls of
the copper tubings.
• Cut the pipe stage by stage, advancing the blade of the pipe cutter slowly. Extra force and deep
cut will cause more distortion on the pipe and thus extra burr. See Figure I.
• Remove burrs from cut edges of the pipes
with remover as shown in Figure II. This will
avoid unevenness on the flare faces which
will cause gas leak. Hold the pipe on top
position and burr removal at lower position to
prevent metal chips from entering the pipe.
• 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. Refer Figure III.
• Fix the pipe firmly on the swaging block.
Match the centers of both the swaging block
and the flaring punch, and 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. Refer
Figure IV.
• Finally, tighten the flare nut with the 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.
Pipe Size (mm/in)
6.35 (1/4")
9.52 (3/8")
12.70 (1/2")
15.88 (5/8")
19.05 (3/4")
Ø Tube, D
Inch mm Imperial
(Wing-nut Type)
1/4" 6.35
3/8" 9.52
1/2" 12.70
5/8" 15.88
3/4" 19.05
1 IM 5CKC-0912(0)DAIKIN-EN.indd 12 1 IM 5CKC-0912(0)DAIKIN-EN.indd 12
Torque, Nm / (ft/Ib)
18(13.3)
42(31.0)
55(40.6)
65(48.0)
78(57.6)
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
Figure I
Cutting Copper Tube
1/4t
Figure II
Remove Burr
Figure III
Copper Tube
Swaging Block
Figure IV
Flare Joint
Indoor Piping
Spanar
1-12
D
Flared Tube
Flare Nut
Torque Wrench
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