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3.
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
1) Do not use mineral oil on flared part.
2) Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.
3) Never use piping which has been used for previous installations. Only use parts which are delivered with
the unit.
4) Do never install a drier to this R410A unit in order to guarantee its lifetime.
5) The drying material may dissolve and damage the system.
6) Incomplete flaring may cause refrigerant gas leakage.
4.
Refrigerant piping.
CAUTION
1) Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)
2) To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil
for R410A.)
3) Use torque wrenches 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 the torque wrenches.
Outdoor Unit Installation (2)
[Apply oil]
Do not apply
refrigeration oil to the
outer surface.
Flare
Do not apply refrigeration
oil to the flare nut avoid
tightening with over torque.
Set exactly at the position shown below.
A
Die
A
(Cut exactly at
right angles.)
Remove burrs
Apply refrigeration
oil to the inner
surface of the flare.
Flaring
Flare tool for R410A
Conventional flare tool
Clutch-type
Clutch-type
(Rigid-type)
0-0.020 inch
0.039-0.059 inch
(0-0.5mm)
(1.0-1.5mm)
Flare's inner
surface must
be flaw-free.
Flare nut tightening torque
Gas side
5/8 inch(15.9mm)
45.6-55.6ft • lbf
(61.8-75.4N • m)
Valve cap tightening torque
Gas side
5/8 inch(15.9mm)
35.5-44.0ft • lbf
(48.1-59.7N • m)
Service port cap tightening torque
7.9-10.8ft • lbf (10.8-14.7N • m)
Wing-nut type
(Imperial-type)
0.059-0.079 inch
(1.5-2.0mm)
Check
The pipe end must
be evenly flared in a
perfect circle.
Make sure that the
flare nut is fitted.
Liquid side
3/8 inch(9.5mm)
24.1-29.4ft • lbf
(32.7-39.9N • m)
Liquid side
3/8 inch(9.5mm)
15.9-20.2ft • lbf
(21.6-27.4N • m)
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