LG ARUN80LN3 Installation Manual page 20

Installation
Preparation of Piping
Main cause of gas leakage is defect in flaring work. Carry out correct flaring work in the following procedure.
1) Cut the pipes and the cable.
■ Use the accessory piping kit or the pipes purchased
locally.
■ Measure the distance between the indoor and the out-
door unit.
■ Cut the pipes a little longer than measured distance.
■ Cut the cable 1.5m longer than the pipe length.
2) Burrs removal
■ Completely remove all burrs from the cut cross section
of pipe/tube.
■ Put the end of the copper tube/pipe to downward direc-
tion as you remove burrs in order to avoid to let burrs
drop in the tubing.
3) Flaring work
■ Carry out flaring work using flaring tool as shown below.
Pipe
Indoor unit
[kW(Btu/h]
Gas
<5.6(19,100) 1/2"
<16.0(54,600) 5/8"
<22.4(76,400) 3/4"
Firmly hold copper tube in a bar(or die) as indicated
dimension in the table above.
4) 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.
20 Outdoor Unit
" A "
Liquid Gas Liquid
1/4" 0.5~0.8 0~0.5
3/8" 0.8~1.0 0.5~0.8
3/8" 1.0~1.3 0.5~0.8
Copper
tube
90
Point down
Bar
Bar
"A"
Copper pipe
Clamp handle
Smooth all round
Inside is shining without scratches.
Inclined
Even length
all round
Slanted Uneven Rough
Pipe
Reamer
Handle
Yoke
Cone
Red arrow mark
= Improper flaring =
Surface Cracked Uneven
damaged thickness