LG CRNN Series Installation Manual page 75

Preparation of Piping
Piping Connection
1. Form the piping according to its routing. Avoid bend-
ing 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 ser-
vice ports of both the liquid and gas side valves.
Model Liquid side piping
5.3kW, 7.0kW Ø6.35
8.2kW Ø9.53
10.6kW Ø9.53
12.3kW Ø9.53
14.1kW Ø9.53
17.6kW Ø12.7
CAUTION
Use two wrenches and tighten with regular torque.
Flare nut fastening torque
Ø6.35mm
Ø9.52mm
Ø12.7mm
Ø15.88mm
Ø19.05mm
Gas side piping
Ø15.87
Ø15.87
Ø15.87
Ø19.05
Ø19.05
Ø19.05
1.8kg . m
4.0kg . m
5.5kg . m
6.6kg . m
6.6kg . m
Liquid side
Outdoor
Flare connection
unit
Gas side
Flare connection
Common Installation Process
Indoor
unit
Union
75