Daikin FTX09 - Refrigerant Piping Work; Flaring the Pipe End; Caution on Piping Handling

78
RXL-W Series EDUS092213A
3P686875-1
9
Indoor Unit Installation
4) If drain hose extension or embedded drain piping is required, use
appropriate parts that match the hose front end.
• When drain hose requires extension, obtain an extension hose
with an inner diameter of 5/8 inch (16mm).
Be sure to thermally insulate the indoor section of the extension
hose.
φ5/8” (φ16mm)
Drain hose supplied
with the indoor unit
Indoor unit
drain hose
Extension drain hose
Heat insulation tube (field supply)
Refrigerant Piping Work
WARNING
• Do not apply mineral oil to the are.
• 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.
• Improper aring may result in refrigerant gas leakage.
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 filings do not enter the pipe.
Remove burrs.
Cut exactly at
right angles.
3) Put the are nut on the pipe.
4) Flare the pipe.
5) Check that the aring has been done correctly.
Set exactly at the position shown below.
Flaring
A
A
0-0.020 inch
(0-0.5mm)
Clutch-type
Flare tool for R410A
0.039-0.059 inch
(1.0-1.5mm)
Clutch-type (Rigid-type)
0.059-0.079 inch
(1.5-2.0mm)
Wing-nut type (Imperial-type)
Conventional are tool
Check
The are's inner
surface must be
aw-free.
The pipe end must
be evenly ared in
a perfect circle.
Make sure that the
are nut is fitted.
Die
2. Refrigerant piping
CAUTION
• Use the are nut fixed to the main unit. (This is to prevent the are nut from cracking as a result of deterioration over time.)
• To prevent gas leakage, apply refrigeration oil only to the inner surface of the are. (Use refrigeration oil for R410A.)
• Use a torque wrench when tightening the are nuts to prevent damage to the are nuts and gas leakage.
• Align the centers of both ares and tighten the are nuts 3 or 4 turns by hand, then tighten them fully with a spanner and a
torque wrench.
Do not apply refrigeration
oil to the outer surface.
Flare nut
Apply refrigeration
oil only to the inner
surface of the are.
Do not apply refrigeration oil to
the are nut to avoid tightening
with excessive torque.
Apply oil
Torque wrench
Piping union
Flare nut
Spanner
Tighten
Gas side
Piping size
O.D.
3/8 inch
(9.5mm)
O.D. 1/2 inch
(12.7mm)
O.D. 5/8 inch
(15.9mm)
O.D. 1/4 inch
(6.4mm)
24-1/8 – 29-1/2Ibf • ft
(32.7-39.9N • m)
36-1/2–44-1/2lbf • ft
(49.5-60.3N • m)
45-5/8–55-5/8Ibf • ft
(61.8-75.4N • m)
10-1/2–12-3/4lbf • ft
(14.2-17.2 N • m)
Flare nut tightening torque
Liquid side
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 for bending.
Wall
If no are cap is
available, cover
the are mouth
with tape to keep
dirt and water out.
Be sure to
place a cap.
Rain
01_EN_3P686875-1.indd 9 2022/04/28 11:02:37