Daikin FTXN09KEVJU Operation Manual page 85

Installation Manual
Outdoor Unit Installation
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 fl are nut on the pipe.
4) Flare the pipe.
5) Check that the fl
WARNING
• Do not use mineral oil on fl
• 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.
• Do never install a drier to this R410A unit in order to guarantee its lifetime.
• The drying material may dissolve and damage the system.
• Incomplete fl aring may cause refrigerant gas leakage.
4.
Refrigerant piping
CAUTION
• Use the fl are nut fi xed 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 fl
• Use torque wrenches when tightening the fl
• 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.
Gas side
1/2 inch (12.7mm)
36.5-44.5ft • lbf
(49.5-60.3N • m)
84
aring is properly made.
ared part.
are nuts to prevent damage to the fl
Flare nut tightening torque
Liquid side
1/4 inch (6.4mm)
10.4-12.7ft • lbf
(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)
Flare's inner surface
must be flaw-free.
are. (Use refrigeration oil for R410A.)
are nuts and gas leakage.
[Apply oil]
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
1/2 inch (12.7mm)
35.5-44.0ft • Ibf
(48.1-59.7N • m)
Service port cap tightening torque
EDUS041111_a
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
be evenly flared in
a perfect circle.
Make sure that the
flare nut is fitted.
Apply refrigeration oil to
the inner surface of the
flare.
Liquid side
1/4 inch (6.4mm)
15.9-20.2ft • Ibf
(21.6-27.4N • m)
7.9-10.8ft • lbf
1 ( 0 8 . 1 - 4 7 . N • m )
Room Air Conditioners K-Series