Connecting Pipes To The Indoor Unit; Preparation Of Piping - LG LBNS3061BL Service Manual

5. Connecting Pipes to the Indoor Unit

• 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.
I Use the accessory piping kit or the pipes purchased
locally.
I Measure the distance between the indoor and the out-
door unit.
I Cut the pipes a little longer than measured distance.
I Cut the cable 1.5m longer than the pipe length.
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 to downward direc-
tion as you remove burrs in order to avoid to let burrs
drop in the tubing.
3) Putting nut on
I 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)
4) Flaring work
I Carry out flaring work using flaring tool as shown below.
Outside Diameter
Capacity
Gas
30K BTU/h 5/8"
36K BTU/h 5/8"
42K BTU/h 3/4"
48K BTU/h 3/4"
60K BTU/h 3/4"
Firmly hold copper tube in a bar(or die) as indicated
dimension in the table above.
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.
Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
" A "
Liquid Gas Liquid
3/8" 0.8~1.0 0.5~0.8
3/8" 0.8~1.0 0.5~0.8
3/8" 1.0~1.3 0.5~0.8
3/8" 1.0~1.3 0.5~0.8
3/8" 1.0~1.3 0.5~0.8
Copper
tube
Point down
Copper tube
Bar
"A"
Copper pipe
Clamp handle
Smooth all round
Inside is shining without scratches.
Even length
all round
- 35 -
Slanted Uneven Rough
90°
Pipe
Reamer
Flare nut
Handle
Bar
Yoke
Cone
Red arrow mark
= Improper flaring =
Inclined Surface Cracked Uneven
damaged thickness
LGE Internal Use Only