Preparation For Piping - LG Therma V Series Installation Manual

Piping and Wiring for Outdoor Unit

Preparation for Piping

Preparation for piping is five steps. As main cause of refrigerant leakage is defects in flaring work, please
carry out correct flaring work in the following steps.
Step 1. Cut the pipes and the cable.
• Use the accessory piping kit or the pipes pur-
chased locally.
• Measure the distance between the indoor unit and
the outdoor unit.
• Cut the pipes a little longer than measured dis-
tance.
Step 2. Burrs removal.
• Remove all burrs completely from cut cross sec-
tion of the pipe.
• Put the end of the pipe to downward direction in
order to prevent drop of burrs into the pipe.
Step 3. Insert flare nut.
• Take out flare nuts attached at the indoor unit and
the outdoor unit.
• Insert flare nuts into burr-removed pipe.
• If flaring work is finished, it is impossible to insert
nuts into pipe.
Step 4. Flaring work.
• Carry out flaring work using dedicated flaring tool
for R-410A refrigerant as shown below.
Outside diameter
mm
6.35
9.52
12.7
15.88
19.05
• Firmly hold copper tube in a bar(or die) as indi-
cated dimension in the table above.
Step 5. Check
• Compare the flared work with right figure.
• If flare is seemed to be defective, cut off the flared
section and do flaring work again.
40 Air-to-Water Heat Pump
"A"
inch mm
1/4 1.1 ~ 1.3
3/8 1.5 ~ 1.7
1/2 1.6 ~ 1.8
5/8 1.6 ~ 1.8
3/4 1.9 ~ 2.1
Copper
tube
90°
Point down
Copper tube
Bar
"A"
Copper pipe
Clamp handle
Smooth all round
Inside is shiny without scratches
Inclined
Even length
all round
Slanted Uneven Rough
Pipe
Reamer
Flare nut
Handle
Bar
Yoke
Cone
Red arrow mark
= Improper flaring =
Surface Cracked Uneven
damaged thickness