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3.
Flaring the pipe end
WARNING
• Do not apply mineral oil to the flare.
• Prevent mineral oil from getting into the system as this would reduce the service life of the units.
• Never use piping which has been used for previous installations. Only use parts which are delivered with this unit.
• Never install a dryer to this R410A unit in order to guarantee its service life.
• The drying material may dissolve and damage the system.
• Incomplete flaring may result in refrigerant gas leakage.
CAUTION
• Do not reuse joints which have been used once already.
1) Cut the pipe end with a pipe cutter.
2) Remove burrs with the cut surface facing
downward, so that the filings do not enter the
pipe.
3) Put the flare nut on the pipe.
4) Flare the pipe.
5) Check that the flaring has been done correctly.
4.
Refrigerant piping
CAUTION
• Use the flare nut fixed to the main unit. (This is to prevent the flare nut from cracking 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 centers 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.
Apply oil
Do not apply refrigeration
oil to the outer surface.
Flare nut
Do not apply refrigeration oil to
the flare nut to avoid tightening
with excessive torque.
■
English
Cut exactly at
right angles.
Set exactly at the position shown below.
Apply refrigeration
oil only to the inner
Torque wrench
surface of the flare.
Spanner
Piping union
The flare's inner
surface must be
flaw-free.
When flaring, do
not over-tighten
Remove burrs.
and crack.
Flaring
Flare tool for R410A
A
Clutch-type
Clutch-type (Rigid-type)
0-0.020 inch
0.039-0.059 inch
Die
A
(0-0.5mm)
(1.0-1.5mm)
Tighten
Flare nut
Check
The pipe end must
be evenly flared in
a perfect circle.
Make sure that the
flare nut is fitted.
Conventional flare tool
Wing-nut type (Imperial-type)
0.059-0.079 inch
(1.5-2.0mm)
6
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