5. TROUBLESHOOTING
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DEFECT
EFFECT
CAUSE
REMEDY
GROUP PARTIALLY
OR COMPLETELY
OUT OF
REFRIGERANT
CHARGE
EXCESSIVELY
FULL
HUMIDITY IN THE
SYSTEM
PRESENCE OF AIR
IN THE SYSTEM
BLOCKED
CAPILLARY
MOTOR-
COMPRESSOR
SHORT-CIRCUITED
OR BLOCKED
MOTOR-
COMPRESSOR
DOSE NOT
COMPRESS
NOISY MOTOR-
COMPRESSOR
Evaporator dose not frost even
though motor-compressor runs
continually.
This defect is indicated by the
presence of water outside
refrigerator near the motor caused
by formations of ice on the return
tube.
This defect is indicated by the partial
frosting of the evaporator and by
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
system which is indicated: on the
evaporator with a slight frost which
dose not freeze and an excessive
overheating of the condenser and
motor-compressor.
Because of the lack of circulation
Freon in the system, there is no
frosting of the evaporator, while a
slight overheating of the first spiral
of the condenser is noted.
The system dose not work and the
"clixson" intervenes interrupting
delivery to the motor-compressor.
No frost forms on the evaporator
even if the motor-compressor is
apparently running regulary.
In case of mechanical failure in the
motor-compressor there in an
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.
An empty refrigerant system
indicates a leakage of R
12
. 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 R
12
is introduced which is greater
than that indicated, the excess gas
dose 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 the Freon
and freezes at the capillary exit in
the evaporator.
There is air in a refrigerating system
when during the filling phase
vacuum is not effected or it is not
adequately done.
Eventual impurities contained in the
Freon or in the components of the
refrigeration system before
assembly and not retained by the
filter can obstruct the capillary.
In case of short circuit, the
breakdown is due to the electric
winding: if blocked, there is a
mechanical failure in the motor-
compressor.
In this case there is a mechanical
failure in the diaphram valves which:
remaining continually open, do not
permit the piston to suck and
compressor the which
consequentely dose not circulate in
the system.
The cause of the excessive noise is
normally to be sought for in a
mechanical break down, and only
rarely in the unhooking of one of the
suspension springs.
Leakage must be eliminated by
resoldering the defective point or
substituting the damaged
evaporator.
The system must be emptied and
subsequently refilled introducing the
correct quantity of R-134a.
The system must be emptied and
then refilled after eliminating the
humidity.
Group must be drained and
subsequently refilled after carefully
creating vacuum.
To restore the system it must be
emptied, substitute the capillary or
the evaporator entirely in case the
capillary is coaxial with respect to
the return tube, then refill it.
The motor-compressor must be
replaced and then proceed with
refilling.
The motor-comprossor must be
replaced and then proceed with
refilling.
The motor-comprossor must be
substituted and then proceed with
the refilling.