Piping Connection; Vacuum Drying - LG Air Conditioner Installation Manual

Connecting Pipes to the Indoor Unit

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
hardening 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
14 Cassette type Air Conditioner
1/4inch
3/8inch
1/2inch
5/8inch
3/4inch
1.8kgf . m
2.7kgf . m
3.7kgf . m
4.7kgf . m
5.7kgf . m
Liquid side
Outdoor
Flare connection
unit
Gas side
Flare connection
Indoor
unit
Union