LG ATNH486DLFC - Indoor Unit Piping Connection

Service Manual 43
Installation
Connecting Pipes to the Indoor Unit
Main cause of gas leakage is defect in flaring work.
Carry out correct flaring work in the following proce-
dure.
1. 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 dis-
tance.
•
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
direction as you remove burrs in order to avoid to let
burrs drop in the tubing.
3. Putting nut on
• Remove flare nuts attached to indoor and outdoor
units, than put them on pipe/tube having complet-
ed burr removal.
(Not possible to put them on after flaring work)
4. Flaring work
• Carry out flaring work using dedicated flaring tool
for R-410A as shown below.
Firmly hold copper tube in a bar(or die) as indicated
dimension in the table above.
5. 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.
Copper
tube
90°
Slanted Uneven Rough
Pipe
Reamer
Point down
Flare nut
Copper tube
Bar
Copper pipe
Clamp handle
Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Inclined
Inside is shining without scratches
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =
Outside diameter A
mm inch mm
Ø6.35 1/4 0~0.5
Ø9.52 3/8 0~0.5
Ø12.7 1/2 0~0.5
Ø15.88 5/8 0~1.0
Ø19.05 3/4 0~1.0
■ Preparation of Piping