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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.
• Improper 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.
Tightening torque
Piping connection
Flare nut
Gas side
3/8 inch (9.5mm)
1/4 inch (6.4mm)
24-1/8 – 29-1/2lbf • ft
10-1/2 – 12-3/4lbf • ft
(32.7-39.9N • m)
(14.2-17.2N • m)
■
English
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.
Valve cap
Liquid side
11/16 inch (17mm)
10-1/2 – 12-5/8lbf • ft
(14.2-17.2N • m)
Cut exactly at
right angles.
Remove burrs.
Set exactly at the position shown below.
Flare tool for R410A
A
Clutch-type
0-0.020 inch
Die
A
(0-0.5mm)
Apply refrigeration
oil only to the inner
surface of the flare.
Spanner
Piping union
Width across flats
3/4 inch (19mm)
12-5/8 – 15-3/8lbf • ft
(17.0-21.0N • m)
Check
The flare's inner
The pipe end must be
surface must be
evenly flared in a
flaw-free.
perfect circle.
When flaring, do
Make sure that
not over-tighten
the flare nut is fitted.
and crack.
Flaring
Conventional flare tool
Clutch-type (Rigid-type)
Wing-nut type (Imperial-type)
0.039-0.059 inch
0.059-0.079 inch
(1.0-1.5mm)
(1.5-2.0mm)
Tighten
Torque wrench
Flare nut
Service port cap
8 – 10-7/8lbf • ft
(10.7-14.7N • m)
6
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