Connecting Pipes; Preparation Of Piping - LG UU85W Installation Manual

CONNECTING PIPES

14
CONNECTING 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 pur-
chased 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 tube/pipe to down-
ward 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 R-410A as shown below.
Outside diameter
mm inch
Ø6.35
Ø9.52
Ø12.7
Ø15.88
Firmly hold copper tube in a bar(or die) as in-
dicated 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"
mm
1/4 1.1~1.3
3/8 1.5~1.7
1/2 1.6~1.8
5/8 1.6~1.8
Copper
Slanted Uneven Rough
tube
90°
Pipe
Point down
Flare nut
Copper tube
Bar
Bar
"A"
Copper pipe
Clamp handle
Smooth all round
Inside is shining without scratches.
= Improper flaring =
Inclined Surface
damaged
Even length
all round
Reamer
Handle
Yoke
Cone
Red arrow mark
Cracked Uneven
thickness