LG GR-282MF user manual download

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Pages:17
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Page 1 of 17
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 motor*compressor
and identify the defects
immediately.
If the defects
have been found, empty the old
system of eventual R-12 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 extension
completely
with male Hansen and
last, solder it to the same tube again.
(Figure 2)
POINT TO BE
BROKEN
SERVICE TUBE EXTENSION
Figure
1
CHARGE TUBE
EXTENSION
MALE HANSEN
SOLDERING POINT
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 heating 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)
puOMT_
cUUM
PRESSURE
GAUGE
Figure
3
Air evacuating
from the system begins so 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 60
minutes. (Figure 3)
In case that a considerable
leakage
occurs and to stop the
vacuum
pump will be necessary
and 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
block 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
R-12 to the refrigerant
system.
Remember
that every
system
has an exact quantity
of R-12 with a tolerance
of
+5 grams that can be added. (Figure 4)
TO THE R-12 CYLINDER
_=
J_
TOsTTHEEMR
EgRIGERATION
Figure 4
Before performing
this
operation
(if the vacuum pump and
refilling cylinder are connected),
make sure that the valve
placed between the vacuum pump and refilling tube are
closed to keep the Freon for adding to the system. (Figure 5)
FILLING OR
VALVE TQ 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 R-12 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-12 has dropped
to 585 grams, remembering
that the
indicator shows a lower limit of meniscus.
Do 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 R-12 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
motor-compressor.
Therefore,
proceed
by adding 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 making the pressure
go down again.
Regulate
the valve again, maintaining
the same manner
until reaching to the quantity
of R-12 established
for the
system
being charged.
When the system
is running,
the
suction
pressure
must be stabilized
between
0.10 to 0.4
atmosphere.
-3-
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