LG GP-W500B6C Installation Manual Download Page 32

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REFRIGERANT PIPING

ENGLISH

Precautions

• Use the standardized products for the refrig-

erant piping.

• Unstandardized pipes often contain dust or

other impurities.

• Make sure to clear inside the pipe by blow-

ing a dehumidified nitrogen gas into the
pipe.

• Be careful not to let dust, water, or other

contaminants enter inside the pipe during in-
stallation.

• Reduce the number of bending areas as

much as possible, and make bending radius
as big as possible

• Always use the branch piping set developed

(invented) by LG.

• If the diameters of the branch piping of the

designed refrigerant pipes are not identical,
cut the connecting section with a pipe cutter
and connect the pipes with a pipe expander
for connecting different diameters.

• Always observe the restrictions on the re-

frigerant piping.
(such as rated length, difference in pressure,
and diameters of the pipes) Failure to do so
may result in equipment failure or a decline
in heating/cooling performance.

• A second branch cannot be made after a

header branch.

Ⓐ

Direction of the outdoor unit (to outdoor
unit)

Ⓑ

Sealed piping (with a cap)

• Be sure to meet standard requirements

when welding.

• Beware that series will not

operate properly when the amount of refrig-
erant is excessive or insufficient.

• Check the records of the piping length and the

amount of additional refrigerant when servicing
the unit.

• Be sure to vacuum using a vacuum pump.

• Always insulate the piping. Insufficient insu-

lation will result in a decline in heating/cool-
ing performance, water dripping from con-
denser and other problems.

• When connecting the refrigerant pipes,

make sure the service valve of the outdoor
unit is completely closed (the factor default
setting).

• Do not open the service valve until all refriger-

ant pipes for the outdoor and indoor units have
been connected, and a refrigerant leakage test
and the evacuation process have been com-
pleted.

• Be sure to let nitrogen flow in the pipe when

welding. Otherwise, excess sludge may form
inside the pipe and disturb the normal opera-
tions of compressor and cause damages.

• Weld after wrappiing the service valve with

wet towel when connecting the valve with the
pipes.
Otherwise, it may cause a refrigerant leakage
and the deterioration of system as well.

• Consult with the service center about the

sound absorber installation when the length of
outdoor/indoor unit piping is short or noise is
possibly passed onto the indoor unit.

CAUTION

• Make the unit vacuum-treated completely

before initial installation or
reinstallation to another place.
- If a different refrigerant is mixed with the

original refrigerant, the refrigerant cycle
may malfunction and the unit may be
damaged.

• After selecting a diameter of the refrigerant

pipe to suit the total capacity of the indoor
unit connected after branching, use an
appropriate branch pipe set according to
the pipe diameter of the indoor unit and
the installation pipe drawing.