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spring inside the compressor has broken .
During the normal operation of compressor ,a slight and uniform hum sound due to
undulation of electric current can be heard generally ,this is a normal
phenomenon .However ,if it sounds like "tong ,tong
",i.e., an impact sound inside the
compressor ,this means that a large quantity of wet vapour of refrigerant or refrigerating oil
has come into the compressor cylinder ;if it sounds like "dang ,dang
", a striking sound of
metal parts inside the compressor ,this means that some moving parts have loosened
(note to differentiate this sound from those formed during starting or stopping the
compressor).
b) Listen to the sound caused by the flowing of gas in the evaporator. Open the refrigerator
door while the compressor is in operation ,incline your ear and listen attentively the gas
flow sound inside the evaporator .If it sounds like gentle whistling accompanied by a sound
similar to water flowing ,this is the sound produced by the normal circulation of refrigerant
within the evaporator .In case only the gas flowing sound can be heard and there is no
water flowing sound ,this indicates that the refrigerant has already percolated .If neither the
flowing sound nor the gas sounds from the evaporator can be heard ,this means that the
filter or capillary has been clogged .
3)Touch and Feel
a) Feel the compressor when running ,its temperature should be generally less than 90
°
C
in the normal state (it may exceed 90
°
C in case of running for a longer period of time ).
b) After the compressor has operated normally for 5~10 minutes , touch and feel the
condenser ,the temperature of its upper part should be higher than that of its lower part (or
its right part is hotter than its left part ,depending on the type of condenser coil ),this
indicates that the refrigerant is circulating . If the condenser is not hot ,this means the
leakage of refrigerant .In case the condenser radiates heat for only several minutes and
then cools down ,this means that the filter and capillary have been clogged .As for the
forced air cooling condenser ,hot air will be blown out of it ;this means that the system is
out of order .
c) Feel the filter's temperature .During the normal operation of refrigerating system ,the
temperature on the filter's surface should be a little higher than the ambient temperature ;if
you touch it with your hand ,you will have a sense of slight heat .In case dew condensation
appears due to the fact that its temperature is obviously lower than the ambient
temperature ,this means that most meshes of its screen has been clogged ,resulting in an
obstructed flowing of refrigerant ,thus causing a drop in temperature due to throttling .
d) Feel the temperature of exhaust gas from the refrigerating system .the exhaust gas
should be very hot and this is the normal working state .For those refrigerator with
enclosed type of compressor refrigerating system, no frost or dew drop will from on the gas
suction tube ,otherwise ,there is something wrong in the system (Frosting and dew
condensation may appear for a very short time period when just starting the machine ,this
is a normal phenomenon ). Because a refrigerator is a combination of several
components ,they are related and have influence on each other In case an abnormal
phenomenon has been found through the above-mentioned checkups ,you need not to
