Daikin Split FTX20K2V1B Mode D'emploi page 21

Refrigerant Piping Work
1.
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 dryer to this R410A or R32 unit in order to guarantee its lifetime.
• The drying material may dissolve and damage the system.
• Protect or enclose the refrigerant tubing to avoid mechanical damage.
• Incomplete flaring may cause refrigerant gas leakage.
2.
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 or R32.)
• Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.
Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with the torque wrenches.
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.
20, 25, 35 class
50, 60 class
3/8 inch
32.7-39.9N • m
49.5-60.3N • m
(330-407kgf • cm) (505-615kgf • cm)
2-1. Caution on piping handling
1) Protect the open end of the pipe against dust and moisture.
2) All pipe bends should be as gentle as possible. Use a pipe bender
for bending.
English
All manuals and user guides at all-guides.com
[Apply oil]
Apply refrigeration oil to
the inner surface of the
flare.
Flare nut tightening torque
Gas side
71 R410A class
1/2 inch
1/2 inch
49.5-60.3N • m
(505-615kgf • cm)
(Cut exactly at
right angles.)
Set exactly at the position shown below.
Flare tool for
A
R410A / R32
Clutch-type
Die
A 0-0.5mm
[Tighten]
Torque wrench
Spanner
Piping union
Flare nut
Liquid side
71 R32 class
1/4 inch
5/8 inch
61.8-75.4N • m
14.2-17.2N • m
(630-770 kgf • cm) (144-175kgf • cm)
Rain
Remove burrs.
Flaring
Conventional flare tool
Clutch-type (Ridgid-type) Wing-nut type (Imperial-type)
1.0-1.5mm 1.5-2.0mm
Check
The pipe end must
be evenly flared in
Flare's inner surface
a perfect circle.
must be flaw-free.
Make sure that the
flare nut is fitted.
Be sure to
place a cap.
If no flare cap is
available, cover the
flare mouth with
tape to keep dirt
or water out.
Wall
14