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LG LRTPC2031T Servicing Precautions

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SERVICING PRECAUTIONS

AIR RECHARGING IN COMPRESSOR

Test the re_geration system connecting it electrically before

refilling operation. It is necessary to ascertain the function

of the motor-compressor and identify the defects

immediately. If defects have been found, empty the old

system of possible R-134a residue by breaking off the end

oftha 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

at last, solder it to the same tube again. (Figure 2)

POINT TO BE BROKEN

SERVICE TUBE EXTENSION

Figure 1

CHARGETUBE FEMALE

EXTENSION HANSEN

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 the heating the 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)

THE

. VACUUM

PRESSURE

GAUGE

Air evacuating from the system begins as soon as the

pump starts. The refrigeration system must be kept under

vacuum untti the reading on the low-pressure gauge

indicates vacuum (0 absolute, -1 stm., -760 mm hg). In any

case it is advisable to keep the pump running for about 30

minutes. (Figure 3)

If considerable leakage occurs, it will be necessary to stop

the vacuum pump and to add a small quantity of Freon to

the system, ff vacuum should not be obtained (pressure

gauge can't fall to 1 atmosphere), start the refrigeration

unit and find the leakage with 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 group.

Because the melted alloy is sucked into the tubes and

bicoks them, the pressure must be rebalancod when

vacuum is in the system when soldering. As soon as the

vacuum operation is over. add the quantity in grams of

R-134a to the refrigeration system. Remember that every

system has an exact quantity of R-134a that can be added

with a tolerance of +-5grams. (Figure 4)

TO THE R-134a CYLINDER

_ _ TOTHEREFRIGE_T_ON

SYSTEM

_-_ t 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 the refilling tube is

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 _ Figure 5

PUMP

In addition, check the graduated scale on the cylinder for

the quantity of R-134a to be added, for example, if we

have 750 grams of Freen in the cylinder and must add 140

grams to the group, this amount will be reached when

R-134a has dropped to 610 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-t34a flow into the system, open the valve

placed at the base of the cylinder connected to the filling

tube. The amount of Freen cannot be added to the system

all at once because it may cause a blocking of 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 Iowedng the pressure again. Open the

valve again, maintaining the same manner until reaching to

the quantity of R-134a established for the system being

charged. When the system is running, the suction pressure

must be stabilized between 0.30 to 0.6 (0.10 to 0.4)

atmosphere.

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