Flaring The Pipe End; Refrigerant Piping - Daikin RXM18WVJU9 Installation Manual

3.

Flaring the pipe end

WARNING
• Do not apply mineral oil to the flare.
• 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 R32 unit in order to guarantee its service life.
• The drying material may dissolve and damage the system.
• Improper flaring may result in refrigerant gas leakage.
CAUTION
• Do not reuse joints which have been used once already.
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.
3) Put the flare nut on the pipe.
4) Flare the pipe.
5) Check that the flaring has been done correctly.
4.

Refrigerant piping

CAUTION
• Use the flare nut fixed to the main unit. (This is to prevent the flare nut from cracking 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 R32 or 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.
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.
Tightening torque
Piping connection
Flare nut
Gas side
1/2 inch (12.7mm) 5/8 inch (15.9mm)
36-1/2–44-1/2lbf • ft 45-5/8–55-5/8lbf • ft
(49.5-60.3N • m) (61.8-75.4N • m)
■
English
Apply oil
Apply refrigeration
oil only to the inner
surface of the flare.
Valve cap
Liquid side 11/16 inch (17mm) 1-1/16 inch (27mm) 1-3/16 inch (30mm)
1/4 inch (6.4mm)
10-1/2–12-5/8lbf • ft
10-1/2–12-3/4lbf • ft
(14.2-17.2N • m)
Cut exactly at Remove
right angles. burrs.
Set exactly at the position shown below.
Flare tool for
A
R32 or R410A
Clutch-type
Die
0-0.020 inch
A
(0-0.5mm)
Tighten
Torque wrench
Spanner
Piping union
Flare nut
Width across flats
35-3/8–44-1/8lbf • ft
(14.2-17.2N • m) (48.0-59.8N • m)
Check
The flare's inner
The pipe end must
surface must be
be evenly flared in a
flaw-free.
perfect circle.
When flaring, do
Make sure that the
not over-tighten and
flare nut is fitted.
crack.
Flaring
Conventional flare tool
Clutch-type Wing-nut type
(Rigid-type) (Imperial-type)
0.039-0.059 inch 0.059-0.079 inch
(1.0-1.5mm) (1.5-2.0mm)
Service port cap
8–10-7/8lbf • ft
(10.7-14.7N • m)
16-5/8–20-1/4Ibf • ft
(22.5-27.5N • m)
6