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5.2. Normal Phenomena—Not Troubles for Refrigerators
In a domestic refrigerato r, there is n ot only a complicated electric control system, bu t also a
refrigerating system that is dif ficult to discern whether it is in
systems are related a nd af fect each other . If a cert ain p art of a refrige rator wo rks abnormall y .It s
refrigerating efficiency will decrease ,operat ion properties will become unst able ,or even it cannot be
used normal ly for those serious case s. Refrigerators are ge nerally of larg er volume ,o nce troubles
appear ,to send them to a service department is really a tough thing ,if such is the case ,the user will
always be in suspense ,s
troubles .Therefore ,before we deal with the topics of frequently occurring troubles of refrigerators and
their remedi es ,we shou ld firs tly give a brief account of
troubles .In case any one of such phenomena occurs ,there is no need to worry about it ,a nd the user
can use it at total ease .
1).When the compressor of a refrigerator has just stopped running ,a rumbling sound can be heard
from inside it s evaporato r .This is a sound caused by th e flowing of r efrigerant in the evapo rator
tubing .Because the pr essure dif ference is still greater af
running ,the refrigerant will flow for a certain time , therefore ,this sound is a normal phenomenon.
2).A click sound can often be heard from the refrigerator .This is a normal sound p roduced by the
pull-in or release of
compressor .The compressor motor w ill produce a
sound is not easy to be heard in the
daytime ,but of course it can be heard distinctly at night.
3).The compressor consist s of an electric mo tor and a compre ssing apparatus .During it s normal
operation ,the motor 's stator core and windings w ill rise to a temperature in the range of 100 ℃ ~110
℃ ,and the temperature of the pi ston and cylinder of the compressing mechanism can also reach as
above 100 ℃ due to the heat produced when compressing refrigerant .Most of the heat radiates to the
air throu gh t he compres sor casing ,therefor e ,it s casing is gener ally at a temperatur e betwee n 85
℃~90℃ ,it is very hot ,particularly in summer when the ambient temperature is higher .All these are
normal phenomena .
4).For the dir ect cooling refrigerato r ,a kind of irregular crack so und can be often heard when the
compressor is running for a certain period of time or has just stopped its running .This sound is caused
by the stress relief due to exp ansion and contraction w hen temperature changes ,and will not
the normal application of refrigerator .
5.3. Common Troubles in Refrigerators and Their Remedies
Causes for troubles occurring in refri gerators are closely related to the qual ity of components and
workmanship in assembling by ma
maintained .The parameters generally used to express the working conditions of a refrigerator include
the temperature inside the refriger ator ,operation rate ,electric power consumption ,noise level ,an d
other functional indexes .If any one of
these parameters is beyo nd its permissible range ,this indicates that there is a fault or trouble in the
refrigerator . During the whole service life of a refrigerator ,the probability of troubles occurring within a
union time i s called it s failure r ate .Making a co mparison be tween the c ontrol circuit system of a
refrigerator and its refrigerating system ,we can find that the failure rate of the former is higher ,an d
that of the thermostat is the highest . In
troubleshooting ,the first thing you must do is to determine where the trouble comes from --- the control
ometimes ,normal
the armature of a
nufacturers as whether refrigerato rs are prop erly used an d
a good working conditio n. Both the
phenomena will be
some normal phen omena which are n ot
ter the compressor has just stopped
current dead weight st art relay whe n st arting the
slight and uniform sound while it is r unning .This
erroneously regarded
as
affect
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