FVXS Installation Manual

12English
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 lings do not enter the pipe.
3) Put the are nut on the pipe.
4) Flare the pipe.
5) Check that the aring has been done correctly.
WARNING
Do not apply mineral oil to the are.
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 aring may result in refrigerant gas leakage.
The flare’s inner
surface must
be flaw-free.
The pipe end must
be evenly flared in
a perfect circle.
Make sure that the
flare nut is fitted.
Set exactly at the position shown below.
A
Flaring
Die
A 0-0.020 inch (0-0.5mm)
Clutch-type
Flare tool for R410A
0.039-0.059 inch (1.0-1.5mm)
Clutch-type (Rigid-type)
0.059-0.079 inch (1.5-2.0mm)
Wing-nut type (Imperial-type)
Conventional flare tool
Cut exactly at right angles.
Remove burrs
Check
6. Connecting the refrigerant pipe
CAUTION
Use the are nut xed to the main unit. (This is to prevent the are nut from cracking as a result of deterioration over time.)
To prevent gas leakage, apply refrigeration oil only to the inner surface of the are. (Use refrigeration oil for R410A.)
Use a torque wrench when tightening the are nuts to prevent damage to the are nuts and gas leakage.
Align the center of both ares and tighten the are nuts 3 or 4 turns by hand, then tighten them fully with a spanner and a
torque wrench.
Torque wrench
Piping union
Flare nut
Do not apply refrigeration
oil to the outer surface.
Flare nut
Apply refrigeration oil to
the inner surface of the
flare.
Do not apply refrigeration oil to
the flare nut to avoid tightening
with excessive torque.
Spanner
Apply oil Tighten
Piping size Flare nut tightening torque
Gas side
O.D. 3/8 inch (9.5mm) 24.1-29.4ft • Ibf (32.7-39.9N • m)
O.D. 1/2 inch (12.7mm) 36.5-44.5ft • lbf (49.5-60.3N • m)
Liquid side O.D. 1/4 inch (6.4mm) 10.5-12.7ft • lbf (14.2-17.2 N • m)
English
01_EN_3P379970-7B.indd 12 11/12/2015 13:29:57