Daikin FDMQ-R Series - Flaring the Pipe End; Connecting the Refrigerant Pipe

104
FTX-N/U, FVXS-N, FDMQ-R Series EDUS091558E
C: 3P379970-7B
12
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 are’s inner
surface must
be aw-free.
The pipe end must
be evenly ared in
a perfect circle.
Make sure that the
are nut is tted.
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 are 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
are.
Do not apply refrigeration oil to
the are 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)
01_EN_3P379970-7B.indd 12 11/12/2015 13:29:57