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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 .
7-2 Common Troubles in Refrigerators and Their Remedies
Causes for troubles occurring in refrigerators are closely related to the quality of components and
workmanship in assembling by manufacturers as whether refrigerators are properly used and
maintained .The parameters generally used to express the working conditions of a refrigerator include
the temperature inside the refrigerator ,operation rate ,electric power consumption ,noise level ,and
other functional indexes .If any one of these parameters is beyond 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 is called its failure rate .Making a comparison
between the control circuit system of a refrigerator and its refrigerating system ,we can find that the
failure rate of the former is higher ,and 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 system or the
refrigerating system .There is general no trouble indicating instrument mounted on the domestic
refrigerator ,locations and natures of troubles should be determined according to their respective
features ,therefore ,experience in servicing is very important to troubleshooting .Service technicians
with rich experience can correctly locate them and take reasonable remedy measures based on their
comprehensive analysis of trouble characteristics as well as operating conditions for various kinds of
refrigerators .
Three Essentials for Checkup
1) Look
a) Check the tubing of refrigerating system for cracks and various welding points for leaks ;if leakage
occurs ,an oil stain can be seen definitely .
b) Check the suction and exhaust pressure values (high pressure and low pressure) of compressor to
see whether they are normal.
c) Check the conditions of frost attached to its evaporator and gas return tube .It is abnormal if frost
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