LG GR-051CN user manual download (Page 2 of 10)

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Pages:10
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Page 2 of 10
If a considerable
leakage
occurs,
it will be necessary
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 doesn'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, repair it after opening
the extension
tube valve and
reestablishing
the normal outside
pressure
inside the
system.
Because
the melted solder is sucked into the tubes and
block them, the pressure
must be rebalanced
when
vacuum
is in the system for 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 than can be added. (Figure 5)
TO THE
R134a CYLINDER
_-__
TO THE
REFRIGERATION
SYSTEM
Figure 5
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 from adding to the system.
(Figure 6)
FILLING OR
VALVE
TO
BE
_
CHARGE
TUBE
OPENED
WHEN
REFILLING
TO THE
TO THE
REFRIGERATION
CHARGE
SYSTEM
CYLINDER
TO THE
VALVE
TO BE
VACUUM
CLOSED
PUMP
AFTER
VACUUM
Figure 6
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
R134a 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 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
motor-compressor.
Therefore,
proceed
by adding
original
quantity
of about 20-30 grams and close the valve
immediately
thereafter.
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 the quantity
of R134a established
for the
system being charged.
When the system
is running, the
suction pressure
must be stabilized
from 0.10 to 0.4
atmosphere.
Use ONLY R134a refrigerant.
Do not substitute
any other type refrigerant.
Do not mix refrigerants.
-4-
Sample
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