Haier BC-117A Series, Service Manual

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13
3 Normal Phenomena
—
Not Troubles for Refrigerators
In a domestic refrigerator, there is not only a complicated electric control
system, but also a refrigerating system that is difficult to discern whether it is
in a good working condition. Both the systems are related and affect each
other. If a certain part of a refrigerator works abnormally .Its refrigerating
efficiency will decrease ,operation properties will become unstable ,or even it
cannot be used normally for those serious cases.
Refrigerators are generally of larger volume ,once 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 ,sometimes ,normal phenomena
will be erroneously regarded as troubles .Therefore ,before we deal with the
topics of frequently occurring troubles of refrigerators and their
remedies ,we should firstly give a brief account of some normal phenomena
which are not troubles .In case any one of such phenomena occurs ,there is
no need to worry about it ,and 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 its evaporator .This is a sound
caused by the flowing of refrigerant in the evaporator tubing .Because the
pressure difference is still greater after the compressor has just stopped
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 produced by the pull-in or release of the armature of a current
deadweight start relay when starting the compressor .The compressor motor
will produce a slight and uniform sound while it is running .This sound is not
easy to be heard in the daytime ,but of course it can be heard distinctly at
night.
3).The compressor consists of an electric motor and a compressing
apparatus .During its normal operation ,the motor
’
s stator core and windings
will rise to a temperature in the range of 100
℃
~110
℃
,and the temperature
of the piston 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 through the compressor casing ,therefore ,its
casing is generally at a temperature between 85
℃
~90
℃
,it is very
hot ,particularly in summer when the ambient temperature is higher .All these
are normal phenomena .
4).For the direct cooling refrigerator ,a kind of irregular crack sound 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
expansion and contraction when temperature changes ,and will not
affect the normal application of refrigerator .
Maintenance Service and Trouble Shooting