TROUBLESHOOTING
DEFECT CAUSE REMEDY
GROUP PARTIALLY
OR COMPLETELY
OUT OF
REFRIGERANT
CHARGE
EXCESSIVELY
FULL
HUMIDITY IN THE
SYSTEM
PRESENCE OFAIR
IN THE SYSTEM
BLOCKED
CAPILLARY
MOTOR-
COMPRESSOR
SHOR%CIRCUITED
OR BLOCKED
MOTOR-
COMPRESSOR
DOSE NOT
COMPRESS
NOISY MOTOR-
COMPRESSOR
EFFECT
Evaporatordose notfrosteven
though motor-compressorruns
continually.
This defectis indicatedby the
presenceof wateroutside
refrigeratornearthe motor caused
by formationsof ice onthe return
tube.
This defectis indicatedby the partial
frostingof the evaporatorand by
continualdefrostingcycles
determinedby the interruptionofthe
flow of gas onthe evaporator.The
motor compressorkeeps running.
Poorperformanceof the refrigerant
system which is indicated:onthe
evaporatorwith a slightfrostwhich
dose not freezeand an excessive
overheatingof the condenserand
motor-compressor.
Becauseof the lackof circulation
Freoninthe system,thereis no
frostingof the evaporator,while a
slightoverheatingofthe first spiral
of the condenseris noted.
Thesystem dose notwork andthe
"clixson"intervenesinterrupting
deliveryto the motor-compressor.
Nofrost formson the evaporator
even if the motor-compressoris
apparentlyrunning regulary.
Incaseof mechanicalfailurein the
motor-compressorthere in an
excessivenoisewhen the systemis
functioning:in casea suspension
springis unhooked,bangingwill be
heard and therewill be especially
strong vibrationswhen the system
starts up and stops.
An emptyrefrigerantsystem
indicates a leakageof R_2.This loss
is generallyto be lookedfor at the
soldering pointsconnectingthe
variouscomponentsor in an
eventualhole in the evaporator
made bythe user.
If in the refrigerantsystema quantity
of R_2is introducedwhich is greater
than that indicated,the excessgas
dose net terminateits expansionin
the evaporatorbut proceedsintothe
returntube.
The refrigerantsystemis humid
when thereis a small percentageof
water presentwhich, notcompletely
retainedby the dehydratorfilter,
enters intocirculationwiththe Freen
and freezes atthe capillaryexit in
the evaporator.
There isair in a refrigeratingsystem
when duringthe filling phase
vacuum isnot effectedor it is not
adequatelydone.
Eventualimpuritiescontainedinthe
Freonor in the componentsof the
refrigerationsystem before
assemblyand not retainedbythe
filter canobstruct the capillary.
Incaseof shortcircuit,the
breakdownis dueto the electric
winding: if blocked,there isa
mechanicalfailurein the motor-
compressor.
Inthiscasethere is a mechanical
failure inthe diaphramvalves which:
remainingcontinuallyopen, do not
permit the pistonto suckand
compressorthe which
consequentelydose notcirculate in
the system.
The causeof the excessivenoiseis
normallyto be soughtfor in a
mechanical breakdown, and only
rarely in the unhookingof one of the
suspensionsprings.
Leakagemust be eliminatedby
resolderingthedefectivepoint or
substitutingthe damaged
evaporator.
Thesystemmust be emptiedand
subsequentlyrefilledintroducingthe
correctquantityof R_2.
Thesystemmust be emptiedand
then refilledafter eliminatingthe
humidity.
Groupmust bedrained and
subsequentlyrefilledaftercarefully
creatingvacuum.
Torestorethe systemit must be
emptied,substitutethe capillaryor
theevaporatorentirelyin casethe
capillaryis coaxialwith respectto
the returntube, then refillit.
Themotor-compressormust be
replacedand then proceedwith
refilling.
Themotor-compressormust be
replacedand then proceedwith
refilling.
Themotor-comprossormust be
substitutedand then proceedwith
the refilling.
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