19
5 Normal Phenomena’s 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
1
o
00 C
~1
o
10 C
,and the
temperature
of
the
piston
and
cylinder
of
the
compressing
mechanism can
also
reach
as
above
1
o
00 C
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
o
85 C~
o
90 C
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 action of refrigerator
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