Preparation Of Piping - LG MULTI V URNU48GVLA2 Montageanleitung

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.
n Use the accessory piping kit or the pipes purchased
locally.
n Measure the distance between the indoor and the out-
door unit.
n Cut the pipes a little longer than measured distance.
n Cut the cable 1.5m longer than the pipe length.
2. Burrs removal
n Completely remove all burrs from the cut cross section
of pipe/tube.
n 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
n Carry out flaring work using flaring tool as shown below.
Pipe
Indoor unit
[kW(Btu/h]
Gas(mm) Liquid(mm) Gas(mm) Liquid(mm)
<5.6(19,100) 12.7
<16.0(54,600) 15.88
<22.4(76,400) 19.05
Firmly hold copper tube in a bar(or die) as indicated
dimension in the table above.
4. Check
n Compare the flared work with figure below.
n If flare is noted to be defective, cut off the flared section
and do flaring work again.
FLARE SHAPE and FLARE NUT TIGHTENING TORQUE
Precautions when connecting pipes
• See the following table for flare part machining dimensions.
• When connecting the flare nuts, apply refrigerant oil to the inside and outside of the flares and turn them three
or four times at first. (Use ester oil or ether oil.)
• See the following table for tightening torque.(Applying too much torque may cause the flares to crack.)
• After all the piping has been connected, use nitrogen to perform a gas leak check.
pipe size
Ø6.35
Ø9.52
Ø12.7
Ø15.88
" A "
6.35 0.5~0.8 0~0.5
9.52 0.8~1.0 0.5~0.8
9.52 1.0~1.3 0.5~0.8
Torque(kgf.m)
1.8~2.5
3.4~4.2 12.8-13.2
5.5~6.6 16.2-16.6
6.3~8.2 19.3-19.7
Copper
tube
90°
Point down
Bar
"A"
Copper pipe
Clamp handle
Smooth all round
Inside is shining without scratches.
Inclined
Even length
all round
A(mm)
8.7~9.1
Installation
Slanted Uneven Rough
Pipe
Reamer
Handle
Bar
Yoke
Cone
Red arrow mark
= Improper flaring =
Surface Cracked Uneven
damaged thickness
flare shape
90° ±2
A
R=0.4~0.8
Installation Manual 9