Installation Manual 29
Flaring Work and Connection of Piping
ENGLISH
Main cause of gas leakage is defect in flaring
work. Carry out correct flaring work in the
following procedure.
1) Cut the pipes and the cable.
n Use the accessory piping kit or the pipes
purchased locally.
n Measure the distance between the indoor
and the outdoor unit.
n Cut the pipes a little longer than
measured distance.
n Cut the cable 1.5 m(4.9 ft) longer than
the pipe length.
2) Burrs removal
n Completely remove all burrs from the cut
cross section of pipe/tube.
n Put the end of the copper tube/pipe to
downward direction as you remove burrs
in order to avoid to let burrs drop in the
tubing.
3) Putting nut on
n Remove flare nuts attached to indoor and
outdoor units, than put them on pipe/tube
having completed burr removal.
(Not possible to put them on after flaring
work)
4) Flaring work
n Carry out flaring work using flaring tool as
shown below.
Firmly hold copper tube in a bar(or die) as
indicated dimension in the table above.
5) Check
n Compare the flared work with figure.
n If flare is noted to be defective, cut off the
flared section and do flaring work again.
Copper
tube
90°
Slanted Uneven Rough
Pipe
Reamer
Point down
Flare nut
Copper tube
Inclined
Inside is shining without scratches.
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =
Bar
Copper pipe
"A"
<Wing nut type> <Clutch type>
Flaring work
Flaring Work and Connection of Piping
Pipe diameter
Inch (mm)
A inch (mm)
Wing nut type Clutch type
Ø 1/4 (Ø 6.35) 0.04~0.05 (1.1~1.3)
0~0.02
(0~0.5)
Ø 3/8 (Ø 9.52) 0.06~0.07 (1.5~1.7)
Ø 1/2 (Ø 12.7) 0.06~0.07 (1.6~1.8)
Ø 5/8 (Ø 15.88) 0.06~0.07 (1.6~1.8)
Ø 3/4 (Ø 19.05) 0.07~0.08 (1.9~2.1)
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