LG LRBP1031NI user manual download

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Pages:33
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SERVICING
PRECAUTIONS
Air
Recharging
in Compressor
Test the refrigeration
by connecting
it electrically
before
refilling operation.
It is necessary
to ascertain
the function
of the meter-compressor
and identify the defects
immediately.
If defects have been found,
empty
the old
system of possible
R134a residue by breaking
off the end
of the extension
piece
at
its narrow point. (Figure 1)
Replace the filter and any damaged
components.
Unsolder
and pull off the piece remaining
inside the service
tube and
then attach an complete
extension
with male Hansen,
and
solder it to the same tube again. (Figure 2)
POINT TO BE
BROKEN
SERVICE TUBE EXTENSION
CHARGE TUBE
EXTENSION
MALE HANSEN
SOLDERING
POINT
Figure
1
Figure
2
It is necessary
to execute
the soldering
operation
with
valve open so that the fumes caused
by oil residue can
come out freely without blowholes
between two tubes
during the heating of the point to be soldered.
The extension fitted with the male Hansen is connected
to
the female fitting of the vacuum
pump tube. (Figure 3)
UM
PRESSURE
GAUGE
igure
3
Air evacuating
from the system begins as soon as the
pump starts. The refrigeration
system must be kept under
vacuum
until the reading on the low-pressure
gauge
indicates
vacuum
(0 absolute,
-1 atm., -760 mm hg) in any
case it is advisable
to keep the pump running for about 30
minutes. (Figure 3)
In case that a considerable
leakage
occurs it will be
necessary
to stop the vaccum
pump and to add a small
quantity
of Freon to the system, if vacuum
should not be
obtained
(pressure
gauge can't fall to 1 atmosphere),
start
the refrigeration
unit and find the leakage
with the special
leak-finder.
When the defective
soldering
point is visible,
re-do it after opening the extension
tube valve and
reestablishing
the normal outside
pressure
inside the
group.
Because
the melted alloy is sucked into the tubes and
blocks them,
the pressure
must be rebalanced
when
vacuum
is in the system
in soldering.
As soon
as
the
vacuum
operation
is over, add the quantity
in grams of
R134a to the refrigeration
system.
Remember
that
every
system
has an exact quantity
of R134a with
a
tolerance
of
+5 grams that can be
added.
(Figure 4)
q\
i
TO TiE
R134a CYLINDER
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TOsTTHEEMR
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F
RiGEF_lr_
N4
Before performing this operation
(if the vacuum pump and
refilling cylinder are connected),
make sure that the valve
placed between the vacuum pump and the refilling tube are
closed in order to keep the Freon for addition to the system.
(Figure 5)
FILLING OR
VALVE TO BE OPENED
CHARGE TUBE
WHEN REFILLING
TO THE
REFRIGERATION
TO THE CHARGE
SYSTEM
CYLINDER
VALVE
TO BE CLOSED
AFTER
VACUUM
TO THE VACUUM
PUMP
Figure
5
In addition, check
the
graduated
scale on the cylinder for
the quantity of R134a to be added, for example,
if we have
750 grams of Freon in the cylinder and must add 165
grams to the group, this amount will be reached
when R-
134a has dropped to 585 grams, remembering
that the
indicator shows a lower limit of meniscus.
De this after
choosing
the scale corresponding
to the gas pressure
different
scales reported
as the same gas pressure
indicated
by the pressure
gauge on the top of the column.
To make R134a flow into the system, open the valve
placed at the base of the cylinder and connected
to the
filling tube. The amount of Freon cannot
be added to the
system all at once because
it may cause a blocking of
the motor-compressor.
Therefore,
proceed
by adding
the
original
quantity
of about 20-30 grams
and
close the valve
immediately.
The pressure
rises and the motor compressor
must start
sucking
the gas and lowering
the pressure
again.
Regulate
the valve again, in the safe way until reaching
the
quantity
of R134a established
for the system being
charged.
When the system is running,
the suction pressure
must be stabilized
between 0.30 to 0.6 atmosphere.
-3-
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