Flaring The Pipe End; Connecting The Refrigerant Pipe - Daikin FTX-N/U Manual

FTX-N/U, FVXS-N, FDMQ-R Series
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 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.
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.
Set exactly at the position shown below.
A
Die
6.

Connecting the refrigerant pipe

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 center 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.
01_EN_3P379970-7B.indd 12
Cut exactly at right angles. Remove burrs
Flaring
Flare tool for R410A
Clutch-type Clutch-type (Rigid-type)
A 0-0.020 inch (0-0.5mm) 0.039-0.059 inch (1.0-1.5mm)
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.
Piping size
O.D. 3/8 inch (9.5mm)
Gas side
O.D. 1/2 inch (12.7mm)
Liquid side O.D. 1/4 inch (6.4mm)
The flare's inner
surface must
be flaw-free.
Conventional flare tool
Wing-nut type (Imperial-type)
0.059-0.079 inch (1.5-2.0mm)
Apply refrigeration oil to
the inner surface of the
flare.
Spanner
Piping union
Flare nut tightening torque
24.1-29.4ft • Ibf (32.7-39.9N • m)
36.5-44.5ft • lbf (49.5-60.3N • m)
10.5-12.7ft • lbf (14.2-17.2 N • m)
104
Check
The pipe end must
be evenly flared in
a perfect circle.
Make sure that the
flare nut is fitted.
Tighten
Torque wrench
Flare nut
C: 3P379970-7B
11/12/2015 13:29:57
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