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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 the evaporatorandby
continua{defrostingcycles
determinedbythe interruptionofthe
flow ofgas onthe evaporator.The
motorcompressorkeepsrunning.
Poorperformanced the refrigerant
systemwhich isindicatedonthe
evaporatorwitha slightfrostwhich
doesnotfreeze andan excessive
overheatingofthe condenserand
motor-compressor.
Becaused the lackd circulation
Freon®in thesystem,there isno
frostingof the evaporator,whilea
slightoverheatingofthe first spiralof
the condenseris noted.
The systemdose notwork and the
"OLP"intervenesinterrupting
deliveryto the motor-compressor.
Nofrostformson the evaporator,
evenif themotor-compressoris
apparentlyrunningregulary,
Incaseof mechanicalfailureinthe
motor-compressorthere in an
excessivenoisewhenthe systemis
functioning.Incasea suspension
springis unhooked,bangingwill be
heardandtherewill beespecially
strongvibrationswhen thesystem
starts upand stops.
An emptyrefrigerantsystem
indicatesaleakaged R134a.This
lossis generallyto belookedfor at
the solderingpointsconnectingthe
variouscomponentsor in an
eventualholein the evaporator
madebythe user.
Ifin the refrigerantsystemaquantity
ofR134aisintroducedwhichis
greaterthanthatindicated,the
excessgas doesnotterminateits
expansioninthe evaporatorbut
proceedsintothe returntube.
The refrigerantsystemis humid
when thereisa smallpercentageof
waterpresent,which,not completely
retainedbythe dehydratorfilter,
entersintocirculationwith the
Freon®and freezesatthe capillary
exitinthe evaporator.
There isair in the refrigerating
systemwhenduring thefillingphase
vacuumis not effectedorit isnot
adequatelydone.
Impuritiescontainedin the Freon@
or inthecomponentsofthe
refrigerationsystem before
assemblyand not retainedbythe
filter can obstructthecapillary.
Incaseof shortcircuit,the
breakdownisdue to the electric
winding.Ifblocked,thereis a
mechanicalfailurein themotor-
compressor.
Inthiscasethere is a mechanical
failurein the diaphramvalveswhich
remainingcontinuallyopen, donot
permitthe compressortooperate.
Consequenteiy,Freon®does not
circulatein thesystem.
The causeof the excessivenoiseis
normallytobe soughtforin a
mechanicalbreakdown,andonly
rarelyin the unhookingofone of the
suspensionsprings.
Leakagemustbe eliminatedby
resolderingthedefectivepointor
substitutingthe damaged
evaporator.
The systemmustbe emptiedand
subsequentlyrefilledintroducingthe
correctquantityof R134a.
The systemmustbe emptiedand
then refilledaftereliminatingthe
humidity.
Groupmust bedrainedand
subsequentlyrefilledaftercarefully
creatingvacuum.
Torestorethesystemit mustbe
emptied,substitutethe capillaryor
the evaporatorentirelyincase the
capillaryis coaxialwith respectto
the returntube,thenrefillit.
The motor,compressormustbe
replacedandthenproceedwith
refilling.
The motoFcomprossormustbe
replacedandthenproceedwith
refilling.
The motor,compressormustbe
replacedandthenproceedwith the
refilling.
-8-
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