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Connecting Copper Pipes
Preparation of Piping
Main cause of gas leakage is defect in flaring
work. Carry out correct flaring work in the
following procedure.
Cut the pipes and the cable.
• Use the accessory piping kit or the pipes
purchased locally.
• Measure the distance between the indoor
and the outdoor unit.
• Cut the pipes a little longer than measured
distance.
• Cut the cable 1.5m longer than the pipe
length.
Burrs removal
• Completely remove all burrs from the cut
cross section of pipe/tube.
• Put the end of the copper tubing to downward
direction as you remove burrs in order to
avoid to let burrs drop in the tubing.
Putting nut on
• 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)
Flaring work
• Carry out flaring work using dedicated
flaring tool for R410A as shown below.
Pipe diameter
Inch (mm)
Wing nut type
Ø 1/4 (Ø 6.35)
Ø 3/8 (Ø 9.52)
0.04~0.07
(1.1~1.8)
Ø 1/2 (Ø 12.7)
Ø 5/8 (Ø 15.88)
Firmly hold copper tube in a bar(or die) as
indicated dimension in the table above.
Check
• Compare the flared work with figure below.
• If flare is noted to be defective, cut off the
flared section and do flaring work again.
A inch (mm)
Clutch type
0~0.02
(0~0.5)
Connecting Copper Pipes
Copper
tube
90°
Point down
Flare nut
Copper tube
Bar
"A"
Copper pipe
Smooth all round
Inside is shining without scratches
Inclined
Even length
all round
Slanted Uneven Rough
Pipe
Reamer
<Wing nut type>
<Clutch type>
= Improper flaring =
Surface
Cracked Uneven
damaged
thickness
Installation Manual 11
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