Flaring Work And Connection Of Piping - LG LS-M3021CL Service Manual

2. Flaring Work and Connection of Piping

1) Flaring work
Main cause for gas leakage is due to defect in flar-
ing work. Carry out correct flaring work in the follow-
ing procedure.
1. Cut the pipes and the cable.
I Use the piping kit accessory or the pipes
purchased locally.
I Measure the distance between the indoor and the
outdoor unit.
I Cut the pipes a little longer than measured
distance.
I Cut the cable 1.5m longer than the pipe length.
Copper
pipe
90°
2. Burrs removal
I Completely remove all burrs from the cut cross
section of pipe/tube.
I Put the end of the copper tube/pipe in a down-
ward direction as you remove burrs in order to
avoid dropping burrs into the tubing.
Point down
3. Putting nut on
I Remove flare nuts attached to indoor and outdoor
unit, then put them on pipe/tube having complet-
ed burr removal.
(not possible to put them on after flaring work)
Copper tube
Slanted Uneven Rough
Pipe
Reamer
Flare nut
4. Flaring work
I Carry out flaring work using flaring tool as shown
below.
Outside diameter
mm
ø6.35
ø9.52
ø12.7
ø15.88
ø19.05
Firmly hold copper pipe in a die in the dimension
shown in the table above.
Bar
Copper pipe
Clamp handle
5. Check
I Compare the flared work with figure below.
I If flare is noted to be defective, cut off the flared
section and do flaring work again.
Smooth all round
Even length
all round
- 25 -
inch
1/4 0 ~ 0.5
3/8 0 ~ 0.5
1/2 0 ~ 0.5
5/8 0 ~ 1.0
3/4 1.0 ~ 1.3
Handle
Bar
Yoke
Cone
Red arrow mark
Inside is shiny without scratches
= Improper flaring =
Inclined Surface Cracked Uneven
damaged
A
mm
thickness