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TROUBLESHOOTING
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
Evaporatordose notfrost even
though motoFcompressorruns
continually.
This defectisindicatedbythe
presenced wateroutside
refrigeratornearthe motorcaused
byformationsof ice onthe return
tube.
This defectisindicatedbythe partial
frosting ofthe evaporatorand by
continualdefrostingcycles
determinedbythe interruptionof the
flow ofgas onthe evaporator.The
motorcompressorkeeps running.
Poorperformanceof the refrigerant
systemwhich is indicated:onthe
evaporatorwith a slightfrostwhich
dose not freezeand anexcessive
overheatingof thecondenserand
motor-compressor.
Becauseof thelack of circulation
Freonin the system,there is no
frosting ofthe evaporator,while a
slightoverheatingofthe first spiralof
the condenseris noted.
The systemdose notwork andthe
"clixson" intervenesinterrupting
deliveryto the motorraompressor.
Nofrost formson the evaporator
even ifthe motor-compressoris
apparentlyrunning regulary.
Incaseof mechanicalfailurein the
motor-compressorthere in an
excessivenoisewhenthe system is
functioning:in caseasuspension
spring isunhooked,bangingwill be
heardand therewill be especially
strong vibrationswhen the system
startsup and stops,
An emptyrefrigerantsystem
indicatesa leakageof R134a This
lossis generallyto belookedfor at
the soldering pointsconnectingthe
variouscomponentsor in an
eventualhole inthe evaporator
madebythe user.
If in the refrigerantsystema quantity
of R134a isintroducedwhich is
greater thanthat indicated,the
excessgas dosenot terminate its
expansionin the evaporatorbut
proceedsintothe returntube.
The refrigerantsystemis humid
when there isa small percentageof
waterpresent which,notcompletely
retainedbythe dehydratorfilter,
enters into circulationwiththe Freon
and freezes atthe capillaryexit in
the evaporator.
There isair in arefrigeratingsystem
when duringthe filling phase
vacuum isnot effectedor it is not
adequatelydone.
Eventualimpuritiescontainedin the
Freonor in the componentsofthe
refrigerationsystembefore
assemblyand not retainedby the
filter canobstruct the capillary.
Incaseof shortcircuit,the
breakdownis dueto the electric
winding: if blocked,thereis a
mechanicalfailurein the motor-
compressoE
Inthis casethere isa mechanical
failurein the diaphramvalveswhich:
remainingcontinuallyopen, do not
permitthe pistonto suck and
compressorthe which
consequenteIydose not circulatein
the system.
The causeof the excessivenoise is
normailytobe soughtfor in a
mechanicalbreak down,and only
rarelyin the unhookingofone of the
suspensionsprings.
Leakagemust beeliminated by
resolderingthe defectivepoint or
substitutingthe damaged
evaporator.
Thesystem mustbe emptiedand
subsequentlyrefilledintroducingthe
correctquantityof R134a.
Thesystem mustbe emptiedand
thenrefilledafter eliminatingthe
humidity.
Groupmust bedrainedand
subsequentlyrefilledaftercarefully
creatingvacuum.
Torestorethe systemit mustbe
emptied,substitutethe capillaryor
the evaporatorentirelyin casethe
capillaryis coaxialwith respectto
the returntube,thenrefill it.
Themotor-compressormustbe
replacedand thenproceedwith
refilling.
Themotor-comprossormustbe
replacedand thenproceedwith
refilling.
Themotor-comprossormustbe
substitutedand thenproceedwith
the refilling.
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