TROUBLESHOOTING
DEFECT CAUSE REMEDY
SYSTEM
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
EFFECT
Evaporatordoesnot frost even
though motor-compressorruns
continually.
This defectisindicatedby the
presenceof water outside the
refrigeratornearthe motorcaused
by formationsof iceon the return
tube.
This defectisindicatedby the partial
frostingof the evaporatorand by
continua{defrostingcycles
determinedby the interruptionof the
flow of gas onthe evaporator.The
motor compressorkeepsrunning.
Poorperformanced the refrigerant
systemwhich isindicatedonthe
evaporatorwith a slightfrost which
does notfreeze and an excessive
overheatingof the condenserand
motor-compressor.
Becaused the lackd circulation
Freon®in thesystem, there is no
frostingof the evaporator,whilea
slightoverheatingofthe first spiralof
the condenseris noted.
The systemdoes notwork and the
"OLP"intervenesinterrupting
deliveryto the motor-compressor.
Nofrost formson the evaporator,
even if themotor-compressoris
apparentlyrunning regulary,
Incaseof mechanicalfailureinthe
motor-compressorthere in an
excessivenoisewhenthe system is
functioning.In casea suspension
springis unhooked,bangingwill be
heard and therewill beespecially
strongvibrationswhen thesystem
starts upand stops.
An emptyrefrigerantsystem
indicatesa leakaged R134a.This
lossis generallyto belookedfor at
the soldering pointsconnectingthe
variouscomponentsor in an
eventualhole in the evaporator
madeby the user.
If in the refrigerantsystema quantity
ofR134a isintroducedwhich is
greaterthan that indicated,the
excessgas does notterminateits
expansionin the evaporatorbut
proceedsintothe returntube.
The refrigerantsystemis humid
when there is a small percentageof
water present,which, not completely
retainedby the dehydratorfilter,
entersintocirculationwith the
Freon®and freezesat the capillary
exit inthe evaporator.
There isair in the refrigerating
systemwhenduring thefilling phase
vacuumis not effectedor it isnot
adequatelydone.
Impuritiescontainedin the Freon@
or in thecomponentsof the
refrigerationsystem before
assemblyand not retainedby the
filter can obstructthe capillary.
Incaseof shortcircuit,the
breakdownisdue to the electric
winding. If blocked,there is a
mechanicalfailurein the motor-
compressor.
Inthis casethere is a mechanical
failurein the diaphramvalveswhich
remainingcontinuallyopen, donot
permitthe compressorto operate.
Consequenteiy,Freon®does not
circulatein the system.
The causeof the excessivenoiseis
normallyto be soughtfor in a
mechanicalbreakdown,and only
rarelyin the unhookingof one of the
suspensionsprings.
Leakagemust be eliminatedby
resolderingthedefectivepointor
substitutingthe damaged
evaporator.
The system mustbe emptiedand
subsequentlyrefilledintroducingthe
correctquantityof R134a.
The system mustbe emptiedand
then refilled aftereliminatingthe
humidity.
Groupmust bedrained and
subsequentlyrefilledaftercarefully
creatingvacuum.
To restorethesystem it must be
emptied,substitutethe capillaryor
the evaporatorentirely incase the
capillaryis coaxialwith respectto
the returntube,then refillit.
The motor,compressormust be
replacedand then proceedwith
refilling.
The motoFcomprossormust be
replacedand then proceedwith
refilling.
The motor,compressormust be
replacedand then proceedwith the
refilling.
-8-
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