LG L5UC728FA2 Installation Manual page 32

Flaring Work and Connection of Piping
5. Check
• Compare the flared work with figure below.
• If flare is noted to be defective, cut off the
flared section and do flaring work again.
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, ball valve
or short tube(only 48k) which is located.
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-Outdoor
1. When piping installation work you must be
used the connector.
Capacity
24/30/36 kBtu/h Ø12.7(1/2")
Connecting pipe size
Capacity
12/18 kBtu/h Ø12.7(1/2")
24/30/36 kBtu/h Ø15.88(5/8")
48 kBtu/h Ø19.05(3/4")
32 Multi Type Air Conditioner
Gas
A B
Ø15.88(5/8")
Gas side Liquid side
Ø6.35(1/4")
Ø6.35(1/4")
Ø9.52(3/8")
Smooth all round
Inside is shining without scratches
Inclined
Even length
all round
Liquid side
Short tube
(48k)
Outdoor
unit
Flare connection
A
= Improper flaring =
Surface Cracked Uneven
damaged thickness
Indoor
unit
Flare connection
Gas side
B