Flaring The Pipe End; Connecting The Refrigerant Pipe - Daikin FVXS09NVJU Manuel D'installation

5�

Flaring the pipe end

1) Cut the pipe end with a pipe cutter.
2) Remove burrs with the cut surface facing downward so that the chips do not enter the pipe.
3) Put the flare nut on the pipe.
4) Flare the pipe.
5) Check that the flaring is properly made.
WARNING
• Do not use mineral oil on flared part.
• Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.
• Never use piping which has been used for previous installations. Only use parts which are delivered with the unit.
• Never install a drier to this R410A unit in order to guarantee its lifetime.
• The drying material may dissolve and damage the system.
• Incomplete flaring may cause refrigerant gas leakage.
Cut exactly at right angles.
Set exactly at the position shown below.
A Flare tool for R410A
Clutch-type
A 0-0.020 inch (0-0.5mm)
Die
6�

Connecting the refrigerant pipe

CAUTION
• Use the flare nut fixed to the main unit. (This is to prevent cracking of the flare nut as a result of deterioration over time.)
• To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R410A.)
• Use a torque wrench when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.
• Align the center of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with a spanner and a
torque wrench.
Do not apply refrigeration oil to
the flare nut to avoid tightening
with excessive torque.
Gas side
Liquid side
■
English
Remove burrs
Flaring
Conventional flare tool
Clutch-type (Rigid-type)
0.039-0.059 inch (1.0-1.5mm)
Apply oil
Do not apply refrigeration
oil to the outer surface.
Flare nut
Piping size
3/8 inch (9.5mm)
1/2 inch (12.7mm)
1/4 inch (6.4mm)
Flare's inner
surface must
be flaw-free.
Wing-nut type (Imperial-type)
0.059-0.079 inch (1.5-2.0mm)
Apply refrigeration oil to
the inner surface of the
flare.
Spanner
Piping union
Flare nut tightening torque
24.1-29.4ft • Ibf (32.7-39.9N • m)
36.5-44.5ft • lbf (49.5-60.3N • m)
10.5-12.7ft • lbf (14.2-17.2 N • m)
Check
The pipe end must
be evenly flared in
a perfect circle.
Make sure that the
flare nut is fitted.
Tighten
Torque wrench
Flare nut
12