Refrigerant Charging; Branch Pipe Fitting - LG MULTI V IV ARUB080BTE4 Installation Manual

20
! WARNING
• Regulation for refrigerant leakage
: the amount of refrigerant leakage should satisfy the following
equation for human safety.
Total amount of refrigerant in the system
Volume of the room at which Indoor Unit of
the least capacity is installed
If the above equation can not be satisfied, then follow the follow-
ing steps.
• Selection of air conditioning system: select one of the next
- Installation of effective opening part
- Reconfirmation of Outdoor Unit capacity and piping length
- Reduction of the amount of refrigerant
- Installation of 2 or more security device (alarm for gas leakage)
• Change Indoor Unit type
: installation position should be over 2m from the floor (Wall
mounted type → Cassette type)
• Adoption of ventilation system
: choose ordinary ventilation system or building ventilation sys-
tem
• Limitation in piping work
: Prepare for earthquake and thermal stress

Refrigerant charging

Ⓐ Manifold Gauge
Ⓑ Low pressure side Handle
Ⓒ High pressure side Handle
Liquid pipe
Low Pressure
Gas pipe
High Pressure
Gas pipe
! WARNING
• Pipe to be vacuumed : gas pipe, liquid pipe
• If the refrigerant amount is not exact, it may not operate
properly.
• If additionally bottled refrigerant amount is over 10%, condenser
burst or insufficient indoor unit performance may be caused.

Branch pipe Fitting

Y branch
≤0.44 (kg / m
3 A
)
• Ensure that the branch pipes are attached horizontally or vertically
(see the diagram below.)
A
• There is no limitation on the joint mounting configuration.
• If the diameter of the refrigerant piping selected by the procedures
described is different from the size of the joint, the connecting sec-
tion should be cut with a pipe cutter.
• Branch pipe should be insulated with the insulator in each kit.
(included with kit)
Header
• When the number of indoor units to be connected to the branch
pipes is less than the number of branch pipes available for connec-
tion then cap pipes should be fitted to the surplus branches.
• Fit branch pipe lie in a horizontal plane.
Horizontal plane
Ⓐ To Branch Piping or Indoor Unit
B Ⓑ To Outdoor Unit
Horizontal
plane
Viewed from point A
in direction of arrow
Liquid and gas
Insulator
pipe joints
Ⓐ To Outdoor Unit
A
Ⓑ To Indoor Unit
• The indoor unit having larger ca-
pacity must be installed closer
to Ⓐ than smaller one.
B • If the diameter of the refrigerant
piping selected by the proce-
dures described is different
from the size of the joint, the
connecting section should be
C
cut with a pipe cutter.
ⓒ Pipe cutter
• When the number of pipes to be
connected is smaller than the
number of header branches, in-
stall a cap to the unconnected
branches.
B
Pinched pipe
View from point B in the direction of the arrow
Facing Facing
downwards upwards
Within +/- 10°
Within ±3° Within ±3°
Tape
(field supply)
Insulator for
field piping