Preparation Of Piping; Connecting Pipes - LG MFL62541004 Installation Manual

CONNECTING PIPES

Preparation of Piping

Main cause of gas leakage is defect in flaring
work. Carry out correct flaring work in the fol-
lowing 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.
Copper
tube
90
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.
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)
Slanted Uneven Rough
Pipe
Reamer
CONNECTING PIPES
Flare nut
Copper tube
Flaring work
- Carry out flaring work using dedicated flaring
tool for R-410A as shown below.
Bar
Bar
"A"
Copper pipe
Clamp handle
Outside diameter
mm inch
Ø6.35 1/4
Ø9.52 3/8
Ø12.7 1/2
Ø15.88 5/8
Firmly hold copper tube in a bar(or die) as indi-
cated 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.
Smooth all round
Inside is shining without scratches
= Improper flaring =
Inclined
Even length
all round
13
Handle
Yoke
Cone
Red arrow mark
"A"
mm
1.1~1.3
1.5~1.7
1.6~1.8
1.6~1.8
Surface CrackedUneven
damaged thickness