Piping Connection; Vacuum Drying - LG LB-D1861HL Service Manual

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
18K, 24K Btu/h
30K Btu/h
36K Btu/h
42K Btu/h
48K Btu/h
60K Btu/h
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
1/4" 5/8"
3/8" 5/8"
3/8" 5/8"
3/8" 3/4"
3/8" 3/4"
1/2" 3/4"
1.8kg . m
4.0kg . m
5.5kg . m
6.6kg . m
6.6kg . m
Outdoor
unit
Flare connection
–29–
Liquid side
Indoor
unit
Flare connection
Gas side
Union