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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 1atmosphere,)
Start the refrigeration unit and find the leakage with a
special leak4inder. 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
blocks 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 Freen from adding to the system.
(Figure 6)
FILLING OR VALVE TO BE
F 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-
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