Piping Connection - LG MT11AH Installation 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.
Connection of the pipes
1. When piping installation work you must be
used the connector.
Gas side
Indoor Units
A
24k Ø15.88 Ø12.7
30k, 36k -
Connecting pipe size
Indoor Units Gas side
7k, 9k, 12k Ø9.52
18k, 24k Ø12.7
30k, 36k Ø15.88
2. Align the center of the pipings and sufficiently tighten the flare nut by hand
3. Finally, tighten the flare nut with torque wrench until the wrench clicks.
■ When tightening the flare nut with torque wrench, ensure the direction for tightening follows the
arrow on the wrench.
CAUTION: Use two wrenches and tighten with regular torque.
Liquid side
B A B
Ø9.52 Ø6.35
- Ø9.52 Ø6.35
Liquid side
Ø6.35
Ø6.35
Ø6.35
Liquid side
Outdoor
unit
Gas side
Flare connection
A
Flare nut fastening torque
mm inch
Ø6.35 1/4
Ø9.52 3/8
Ø12.7 1/2
Ø15.88 5/8
Ø19.05 3/4
Installation of Indoor
Indoor
unit
Flare connection
B
kgf . m
1.8~2.5
3.4~4.2
5.5~6.6
6.3~8.2
9.9~12.1
Installation Manual 15