LG Multi V PRHR033 Installation Manual page 25

For Heat Pump System Installation
Ⓐ Manifold Gauge
Ⓑ Low pressure side Handle
Ⓒ High pressure side Handle
Liquid pipe
Not used
Gas pipe
WARNING
!
• Pipe to be vacuumed
- For Heat Recovery system : Liquid pipe, Low Pressure gas pipe
- For Heat Pump system : Liquid pipe, Gas 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.
• Low pressure gas pipe should be sealed with a cap in piping
accessories during refrigerant charging.
Branch pipe Fitting
Y Branch
A
• Ensure that the branch pipes are attached horizontally or vertically
(see the diagram below.)
Branch Leg
Straight-through Leg
Y-branch Inlet
Outdoor unit Y-branches can only be installed in a horizontal or vertical
UP configuration. The vertical DOWN configuration is not permitted.
• 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
section should be cut with a pipe cutter.
• Branch pipe should be insulated with the insulator in each kit.
Liquid and gas
Insulator
pipe joints
(included with kit)
Ⓐ To Outdoor Unit
B
Ⓑ To Branch Piping or Indoor Unit
-3° +3° -3° +3°
Vertical DOWN
Configuration for
Indoor Unit
Y-Branches.
±5°
Horizontal
Vertical UP
Plane
Configuration for
±5°
Indoor Unit
Y-Branches.
Outdoor Unit is Permitted. Outdoor Unit is Not Permitted.
Tape
(field supply)
Insulator for
field piping
Header
A
B
C
• When the number of indoor units to be connected to the branch
pipes is less than the number of branch pipes available for
connection then cap pipes should be fitted to the surplus branches.
B
• Fit branch pipe lie in a horizontal plane.
Horizontal plane
View from point B in the direction of the arrow
• Header should be insulated with the insulator in each kit.
• Joints between branch and pipe should be sealed with the tape
included in each kit.
Tape
Insulator
Insulator of field pipe
• Any cap pipe should be insulated using the insulator provided with
each kit and then taped as described above.
Insulator for cap pipe
Cap pipe
Ⓐ To Outdoor Unit
Ⓑ To Indoor Unit
• The indoor unit having larger
capacity must be installed closer
to Ⓐ than smaller one.
• If the diameter of the refrigerant
piping selected by the
procedures described is
different from the size of the
joint, the connecting section
should be cut with a pipe cutter.
ⓒ Pipe cutter
• When the number of pipes to be
connected is smaller than the
number of header branches,
install a cap to the unconnected
branches.
Pinched pipe
Insulate the header using
the insulation
material attached to the
branch pipe kit
as shown in the figure.
Tape
25