LG LUU249HV, Instruction Manual

Page: 11 / 23

CONNECTING COPPER PIPES
ENGLISH
11
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 1.5 m(4.9 ft) longer than the
pipe length.
Burrs removal
- Completely remove all burrs from the cut
cross section of pipe.
- Put the end of the copper tubing to
downward direction as you remove chips in
order to avoid to let chips drop in the pipe.
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
- Firmly hold copper tube in a bar(or die) as
indicated dimension in the table above.
- Carry out flaring work using dedicated flaring
tool for R-410A as shown below.
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.
Copper
tubing
90 °
Slanted Uneven Rough
Pipe
Reamer
Point down
Flare nut
Copper tubing
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)
<Wing nut type>
<Clutch type>
Bar
Copper pipe
"A"
Inclined
Inside is shining without scratches
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =
CONNECTING COPPER PIPES