LG LM-4462C2T Service Manual page 22

Piping Connection
1. Form the piping according to its routing. Avoid
bending and bending back the same piping point
more than three times. (This will result in harden-
ing the pipe.)
2. After deforming the piping, align centers of the
union fitting of the indoor unit and the piping, and
tighten them firmly with wrenches.
3. Connect pipe to the service valve or ball valve
which is located below the outdoor unit.
4. After completing the piping connection, be sure
to check if there is gas leakage in indoor and
outdoor connection.
Vacuum drying
After completing the piping connection, execute
vacuum drying for the connecting piping and the
indoor unit.
The vacuum drying must be carried out using the
service ports of both the liquid and gas side valves.
CAUTION
Use two wrenches and tighten with regular torque.
Flare nut fastening torque
Ø6.35mm
Ø9.52mm
Ø12.7mm
Ø15.88mm
Ø19.05mm
1.8kg . mm
4.0kg . mm
5.5kg . mm
6.6kg . mm
6.6kg . mm
Outdoor
unit
–22–
Liquid side
Indoor
unit
Flare connection
Gas side
Flare connection
Union