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5. 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 frosteven
thoughmotor-compressorruns
continually.
This defectisindicatedbythe
presenceofwateroutsidethe
refrigeratornearthe motorcaused
byformationsof iceon the return
tube.
This defectisindicatedbythe partial
frostingof theevaporatorandby
continualdefrostingcycles
determinedbythe interruptionofthe
flow ofgas onthe evaporator.The
motorcompressorkeepsrunning.
Poorperformanceofthe refrigerant
systemwhichis indicated:onthe
evaporatorwitha slightfrostwhich
doesnotfreeze andanexcessive
overheatingofthe condenserand
motor-compressor,
Becauseofthe lackofcirculation
Freonin 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.
No frostformson the evaporator,
evenifthe motor-compressoris
apparentlyrunningregulary.
Incaseof mechanicalfailurein the
motor-compressorthere in an
excessivenoisewhenthe systemis
functioning.Incasea suspension
springis unhooked,bangingwill be
heardandtherewill be especially
strongvibrationswhen thesystem
starts upand stops.
An emptyrefrigerantsystem
indicatesaleakageof R134a.This
lossis generallyto belookedfor at
the solderingpointsconnectingthe
variouscomponentsor inan
eventualholein the evaporator
madebythe user.
Ifin the refrigerantsystema quantity
of R134aisintroducedwhichis
greaterthanthatindicated,the
excessgas doesnotterminateits
expansioninthe evaporatorbut
proceedsintothe returntube.
The refrigerantsystemis humid
when there isa smallpercentageof
waterpresent,which,notcompletely
retainedbythe dehydratorfilter,
entersintocirculationwith the
Freon®and freezesatthe capillary
exitin theevaporator,
There isair in the refrigerating
systemwhenduring thefilIingphase
vacuumis not effectedor it isnot
adequatelydone.
Impuritiescontainedin the Freon®
or in thecomponentsofthe
refrigerationsystem before
assemblyand not retainedbythe
filter can obstructthe capillary.
Incaseof shortcircuit,the
breakdownisdue tothe electric
winding.Ifblocked,there is a
mechanicalfailurein the motor-
compressor.
Inthiscasethere is amechanical
failurein the diaphramvalveswhich
remainingcontinuallyopen, donot
permitthe compressortooperate.
Consequentely,Freon®does not
circulatein thesystem.
The causeof the excessivenoiseis
normallytobe soughtfor in a
mechanicalbreakdown,andonly
rarelyin the unhookingofone of the
suspensionsprings.
Leakagemustbeeliminatedby
resolderingthe defectivepointor
substitutingthe damaged
evaporator,
The systemmustbe emptiedand
subsequentlyrefilledintroducingthe
correctquantityof R134a.
The systemmustbe emptiedand
thenrefilledaftereliminatingthe
humidity.
Groupmust bedrainedand
subsequentlyrefilledaftercarefully
creatingvacuum.
Torestorethesystemit mustbe
emptied,substitutethe capillaryor
the evaporatorentirelyincasethe
capillaryis coaxialwith respectto
the returntube,then refillit,
The motor-compressormustbe
replacedandthenproceedwith
refilling.
The motor-comprossormustbe
replacedandthenproceedwith
refilling.
The motor-compressormustbe
replacedandthenproceedwith the
refilling.
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