LG GC-W061BTH.CTICJHK Service Manual page 11

5-4. REFRIGERATING CYCLE
5-4-1. Troubleshooting chart
DEFECT
Freezer and fridge room do
SYSTEM
not frost even though motor-
PARTIALLY OR
compressor runs continually.
COMPLETELY OUT
OF REFRIGERANT
CHARGE
EXCESSIVELY
This defect is indicated by the
presence of water outside the
FULL
refrigerator near the motor caused by
formations of ice on the return tube.
HUMIDITY IN THE This defect is indicated by the partial
frosting of the freezer room and by
SYSTEM
continual defrosting cycles determined
by the interruption of the flow of gas
on the evaporator. The motor
compressor keeps running.
Poor performance of the refrigerant
PRESENCE OF AIR
system which is indicated on the
IN THE SYSTEM
evaporator with a slight frost which
does not freeze and an excessive
overheating of the condenser and
motor-compressor.
Because of the lack of circulation
isobutane in the system, there is no
BLOCKED
frosting of the evaporator, while a
CAPILLARY
slight overheating of the first spiral of
the condenser is noted.
MOTOR-
No frost forms on the evaporator, even
if the motor-compressor is running.
COMPRESSOR
DOSE NOT
COMPRESS
In case of mechanical failure in the
NOISY MOTOR-
motor-compressor there in an
COMPRESSOR
excessive noise when the system is
functioning. In case a suspension
spring is unhooked, banging will be
heard and there will be especially
strong vibrations when the system
starts up and stops.
EFFECT
An empty refrigerant system indicates
a leakage of isobutane (R600a). This
loss is generally to be looked for at the
soldering points connecting the
various components or in an eventual
hole in the evaporator made by the
user.
If in the refrigerant system a quantity
of R600a is introduced which is
greater than that indicated, the excess
gas does not terminate its expansion
in the evaporator but proceeds into the
return tube.
The refrigerant system is humid when
there is a small percentage of water
present, which, not completely
retained by the dehydrator filter, enters
into circulation with isobutane and
freezes at the capillary exit in the
evaporator.
There is air in the refrigerating system
when during the filling phase vacuum
is not effected or it is not adequately
done.
Impurities contained in isobutane or
in the components of the refrigeration
system before assembly and not
retained by the filter can obstruct the
capillary.
In this case there is a mechanical
failure in the diaphram valves which
remaining continually open, do not
permit the compressor to operate.
Consequentely, isobutane does not
circulate in the system.
The cause of the excessive noise is
normally to be sought for in a
mechanical breakdown, and only
rarely in the unhooking of one of the
suspension springs.
- 11 -
CAUSE
Leakage must be eliminated by
resoldering the defective point .
The system must be emptied and
subsequently refilled introducing the
correct quantity of R600a.
The system must be emptied and then
refilled after eliminating the humidity.
Group must be drained and
subsequently refilled after carefully
creating vacuum.
Do away with the refrigerator.
The motor-comprossor must be
replaced and then proceed with
refilling.
The motor-compressor must be
replaced and then proceed with the
refilling.
REMEDY