LG LMNH122LRA0 Service Manual page 54

Installation
Connection of Piping
• When connecting indoor units, make sure to connect refrigerant pipes and connection wires to the appropriate connection ports
maked with matching alphabets. (A, B, C, D)
:
NOTICE
• Be sure to mark all the local refrigerant piping(liquid pipes, gas pipes,
etc.) for each indoor unit designating clearly which room it belongs
in.(A, B, C, D)
:
NOTICE
For flaring work the piping, follow the instructions in the installation manual to each unit.
Connecting the pipings to the in door unit
and drain hose to drain pipe
1. Align the center of the pipings and sufficiently tight-
en the flare nut by hand.
2. Tighten the flare nut with a wrench.
Outside diameter
mm inch
Ø6.35 1/4
Ø9.52 3/8
Ø12.7 1/2
Ø15.88 5/8
Ø19.05 3/4
Wrap the insulation material around the
connecting portion.
1. Overlap the connection pipe insulation material and
the indoor unit pipe insulation material. Bind them
together with vinyl tape so that there is no gap.
2. Wrap the area which accommodates the rear piping
housing section with vinyl tape.
Close up a socket out of use with a brass
cap.
1. Align the center of the piping and sufficiently tighten
the brass cap by hand.
2. Tighten the brass cap with a wrench.
3. Wrap the area contacted with insulation.
CAUTIONS
• Never use the plastic cap for sealing.
• Make sure to use brass cap with the end of
pipe sealed or welded tightly.
54 Multi type Air Conditioner
Torque
kg . m
1.8
4.2
5.5
6.6
6.6
A B
BD Unit Socket Flare nut
Open-end wrench (fixed)
Flare nut
Wrench
BD Unit Socket
BD Unit
Vinyl tape (wide) Wrap with vinyl tape
Connecting cable
Vinyl tape(narrow)
BD Unit Socket Brass cap
C D
Pipes
Connection pipe
Indoor unit pipe
Pipe
Pipe sealed
or welded