Piping Connection - LG CEILING CASSETTE TYPE AIR CONDITIONERS Installation Instructions Manual

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
1.8kg . m
4.0kg . m
5.5kg . m
6.6kg . m
6.6kg . m
11
Liquid side
Outdoor
Flare connection
unit
Gas side
Flare connection
Union
Indoor
unit