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BCD-230W 260W Service Manual

Printed at April 23, 2002

3.1

Refrigerator Examination

3.1.1

General Examination

Check the integrality of the component and the
damage, such as scratch or dent, of the decorative
surface for the refrigerator; record the result down
as detail as possible.

3.1.2

Electrical Component Examination

Steps:
a)

Check the integrality of all components

Check the electrical connection is matched
with the electrical schematics on the back of
refrigerator

Make sure that there are no any short circuit or
open circuit

Check the insulation performance

Check the condition of the electric
components, such as compressor, PTC starter,
overload protector, thermostat and defrost
components etc.

Check the running performance: Start-up the
refrigerator and measure the current stated
below while compressor is running:

<1> Start-up current: It is about 5~8 times of
the rated current. If the start-up current is more
than or equal to 8 times of the rated current, it
is regarded as a high start-up current. The high
start-up current is caused by short circuit in the
motor start-up winding. If it is seriously
enough, the refrigerator may not work
properly. Usually, it takes 0.2~0.5 second for
refrigerator to start-up and go into a run
condition, and the current will drop down
rapidly during this session.

<2> run current: If the running current is
higher than rated current after start-up, it is
regarded as a large running current. The large
run current may be caused by overcharge of
refrigerant or the air existence in the
refrigeration system. The large running current
could be checked out through an electric
multimeter.

3.1.3

Refrigeration System Examination

Steps:
a)

By touching the evaporator slightly to check if
the refrigerator does work after it is powered
up 30 minutes.

Set the thermostat at “4”, check the fresh-food
compartment temperature after powered up 2
hours: the average temperature of the center
point should be between (0~10)

, and then

check the percentage of running time that is
generally between 3:1~1:1 in summer and
1:3~1:5 in winter.

System leak Inspection: leakage means the
refrigerant tiny leakage or serious leakage in
refrigeration system caused by poor weld,
crack or corrosion on piping, evaporator or
other components. The phenomena will be:
less or none cold at all in evaporator, less or
no heat at all on discharge pipe of the
compressor, little frost or no frost at all on
evaporator and less or no water flow sound at
all when the compressor keeps running.
Breaking down the process pipe of compressor,
only a little or even no refrigerant rushes out.

Check the blockage of the system:

It is caused by mechanical remains, iced drop or
desiccant fragment etc. The phenomena of system
blockage is very similar to that of system leakage,
but the pressure in the evaporator will be nearly
vacuum and the refrigerant will rush out with a
great whistle when break down the process pipe of
compressor. If the system is block up at the drier-
filter, the shell of that will be cold or even have
some dew on it. If the system is frozen up at the
exit of capillary, the refrigerator may get cooling
intermittently, and the pressure in the evaporator is
near vacuum when it doesn’t refrigerate. The
system breakage could only be checked out with
the experience.
e)

Compressor failure check: compressor can be
started and run normally, but the refrigerator
can’t be cooled down. Cutting off the suction
pipe and discharge pipe, running the
compressor independently, neither the suction
nor the discharge could be detected. It is a
compressor failure. It’s suggested to replace a
failure compressor rather than to repair it.

3.2

Refrigerator Maintenance

3.2.1

Electrical System Maintenance

Connect the cords as electric schematic show
on the back of the refrigerator

Check the tightness of each connector

Make up the lack of the electrical components

Repair or replace the damaged electrical
components

Soporte Técnico