LG LRBP1031W User Guide

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

'__

TOsTTHEEMR

E

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-

LG LRBP1031W User Guide

LG LRBP1031W - 10 Cu. Ft. Cabinet Depth Bottom Freezer Refrigerator Manual

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