Refrigerant Piping Work; Flaring The Pipe End; Refrigerant Piping; Caution On Piping Handling - Daikin FTX09NMVJU Manuel D'installation

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 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.
2�

Refrigerant piping

CAUTION
• Use the flare nut fixed to the main unit. (This is to prevent cracking of the flare nut 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 centers 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.
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.
2-1� Caution on piping handling
• Protect the open end of the pipe against dust and moisture.
• All pipe bends should be as gentle as possible. Use a pipe bender
f or bending.
9
Tighten
Apply refrigeration
Torque wrench
oil to the inner
surface of the flare.
Spanner
Piping union
Flare nut
Cut exactly at
right angles.
Set exactly at the position shown below.
Flare tool for R410A
A
Clutch-type
0-0.020 inch
Die A
(0-0.5mm)
Flare nut tightening torque
Gas side
3/8 inch (9.5mm) 1/2 inch (12.7mm)
24-1/8 – 29-1/2ft • Ibf 36-1/2 – 44-1/2ft • lbf
(32.7-39.9N • m) (49.5-60.3N • m)
Rain
Remove burrs.
Flaring
Conventional flare tool
Clutch-type (Rigid-type) 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 be
a perfect circle.
flaw-free.
Make sure that the
flare nut is fitted.
Liquid side
5/8 inch (15.9mm) 1/4 inch (6.4mm)
45-5/8 – 55-5/8ft • Ibf
10-1/2 – 12-3/4ft • lbf
(61.8-75.4N • m)
(14.2-17.2 N • m)
Be sure to
place a cap.
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt and water out.
Wall
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English