Daikin FTXN09KEVJU Operation Manual page 74

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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
• Do not use mineral oil on flared part.
• Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.
• Never use piping which has been used for previous installations. Only use parts which are delivered with the unit.
• Never install a drier to this R410A unit in order to guarantee its lifetime.
• The drying material may dissolve and damage the system.
• Incomplete flaring may cause refrigerant gas leakage.
4.
Refrigerant piping
CAUTION
• Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)
• To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R410A.)
• 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.
Room Air Conditioners K-Series
Flare nut tightening torque
Gas side Liquid side
3/8 inch (9.5mm) 1/4 inch (6.4mm)
24.1-29.4ft • lbf 10.4-12.7ft • lbf
(32.7-39.9N • m) (14.2-17.2N • m)
(Cut exactly at
right angles.)
Flaring
Set exactly at the position shown below.
A Flare tool for R410A
Clutch-type Clutch-type (Rigid-type)
Die
0-0.020 inch
A
(0-0.5mm)
Do not apply refrigeration
oil to the outer surface.
Flare nut
Do not apply refrigeration
oil to the flare nut avoid
tightening with over torque.
Valve cap tightening torque
Gas side Liquid side
3/8 inch (9.5mm) 1/4 inch (6.4mm)
15.9-20.2ft • lbf 15.9-20.2ft • lbf
(21.6-27.4N • m) (21.6-27.4N • m)
Service port cap 7.9-10.8ft • lbf
tightening torque (10.8-14.7N • m)
Installation Manual
Remove burrs.
Conventional flare tool
Wing-nut type (Imperial-type)
0.039-0.059 inch 0.059-0.079 inch
(1.0-1.5mm) (1.5-2.0mm)
Check
The pipe end must
Flare's inner
be evenly flared in
surface must
a perfect circle.
be flaw-free.
Make sure that the
flare nut is fitted.
[Apply oil]
Apply refrigeration oil to
the inner surface of the
flare.
73