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12
2) Listen
a) Listen to the noises produced when the compressor is running hums from a fully enclosed
aggregate unit is the sound caused by overload indicating that the motor cannot be started normally,
meanwhile ,a clattering sound can be heard from inside the start relay ,which is produced because
the start contacts cannot be released normally .A whistling sound is caused by the high pressure
gas flowing out of the crack of the pressure tube inside the compressor ,and clucks are the sound of
striking after the suspended 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
a) Listen to the noises produced when the compressor is running hums from a fully enclosed
aggregate unit is the sound caused by overload indicating that the motor cannot be started normally,
meanwhile ,a clattering sound can be heard from inside the start relay ,which is produced because
the start contacts cannot be released normally .A whistling sound is caused by the high pressure
gas flowing out of the crack of the pressure tube inside the compressor ,and clucks are the sound of
striking after the suspended 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
"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 .
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 .
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