Connecting Copper Pipes; Preparation Of Piping - LG LUU188HV Installation Manual

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(4.9ft) longer than the
pipe length.
Copper
90
tubing
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.
Point down
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)
Flare nut
Copper tubing
Slanted Uneven Rough
Pipe
Reamer
CONNECTING COPPER PIPES
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.
Pipe diameter
Inch (mm)
Wing nut type
Ø1/4 (Ø6.35) 0.04~0.05 (1.1~1.3)
Ø3/8 (Ø9.52) 0.06~0.07 (1.5~1.7)
Ø1/2 (Ø12.7) 0.06~0.07 (1.6~1.8)
Ø5/8 (Ø15.88) 0.06~0.07 (1.6~1.8)
Ø3/4 (Ø19.05) 0.07~0.08 (1.9~2.1)
Bar
<Wing nut type>
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.
Smooth all round
Inside is shining without scratches
Inclined
Even length
all round
11
A inch (mm)
Clutch type
0~0.02
(0~0.5)
"A"
Copper pipe
<Clutch type>
= Improper flaring =
Surface Cracked Uneven
damaged thickness