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later ,open the refrigerant charging tube and et the refrigerant escape from it ,replace the dry
filter ,recharge refrigerant after evacuating ,and then seal the charging port .
3) There is air left in the refrigerating system Analysis of Trouble Residual air in the refrigerating
system will reduce its refrigerating efficiency .The prominent phenomena are the increase in its gas
suction and exhaust pressures (however ,the gas exhaust pressure will not exceed its rated
value ),obvious increase in temperature in the segment from the compressor outlet to the condenser
inlet .Because there is air in the system ,both the gas exhaust pressure and temperature will
rise ,and moreover ,the gas flowing sound is intermittent and obviously louder .
Remedy
After shut down for several minutes, open the tubing, evacuate it and then recharge the system with
refrigerant .
4) Low efficiency of compressor
Analysis of Trouble
Low efficiency of a refrigerating compressor refers to the actual reduction of gas discharge
capacity ,and hence the corresponding reduction of refrigerating capacity ,under the condition that
the refrigerant in the system is unchanged .This phenomenon occurs mostly when the compressor
has been used for quite a long time ,its moving parts have worn to a considerable degree ,fit
clearance between various parts have increased and sealing property of its gas valve has
deteriorated ,resulting in an decrease in its actual gas discharge capacity .
Methods of Judgment
Measure the high and low pressures with pressure gauges to see whether they are normal .If an
abnormal sound comes from the compressor or the temperature of its causing is too high ,Cut the
discharge port open and operate the compressor ,feel it if there is pressure at the discharge port
with your finger (For a normal compressor ,its discharge port is difficult to be blocked with your finger
if you just apply a little effort).
5) Too thick frost layer formed on evaporator
Analysis of Trouble
If a direct cooling refrigerator is to be used for a prolonged period of time ,be sure to defrost its
evaporator regularly ;if you fail to do so ,the frost layer on the evaporator tubing will become thicker
and thicker .Heat conduction will be severely affected when the whole tubing is wrapped with a
transparent ice layer ,and finally the temperature in the refrigerator cannot drop down to the
prescribed range .
Remedy Turn the refrigerator off, and make preparations for defrosting ,open the refrigerator door to
let the air come in ,or use a fan to speed up air flowing so as to shorten the time needed for
defrosting .Never strike the frost layer with any iron tools or wood stick in order to avoid damage to
the evaporator tubing .
6) Refrigerating oil left in evaporator tubing
Analysis of Trouble During the process of refrigerating cycles, a little refrigerating oil may remain in
the evaporator tubing and after a longer time of operation ,if there is considerable refrigerating oil left
in the evaporator ,the heat conduction effect will be severely affected ,thus causing a poor
refrigerating effect .
Remedy It is quite difficult to determine whether this trouble is caused by the refrigerating oil left in
filter ,recharge refrigerant after evacuating ,and then seal the charging port .
3) There is air left in the refrigerating system Analysis of Trouble Residual air in the refrigerating
system will reduce its refrigerating efficiency .The prominent phenomena are the increase in its gas
suction and exhaust pressures (however ,the gas exhaust pressure will not exceed its rated
value ),obvious increase in temperature in the segment from the compressor outlet to the condenser
inlet .Because there is air in the system ,both the gas exhaust pressure and temperature will
rise ,and moreover ,the gas flowing sound is intermittent and obviously louder .
Remedy
After shut down for several minutes, open the tubing, evacuate it and then recharge the system with
refrigerant .
4) Low efficiency of compressor
Analysis of Trouble
Low efficiency of a refrigerating compressor refers to the actual reduction of gas discharge
capacity ,and hence the corresponding reduction of refrigerating capacity ,under the condition that
the refrigerant in the system is unchanged .This phenomenon occurs mostly when the compressor
has been used for quite a long time ,its moving parts have worn to a considerable degree ,fit
clearance between various parts have increased and sealing property of its gas valve has
deteriorated ,resulting in an decrease in its actual gas discharge capacity .
Methods of Judgment
Measure the high and low pressures with pressure gauges to see whether they are normal .If an
abnormal sound comes from the compressor or the temperature of its causing is too high ,Cut the
discharge port open and operate the compressor ,feel it if there is pressure at the discharge port
with your finger (For a normal compressor ,its discharge port is difficult to be blocked with your finger
if you just apply a little effort).
5) Too thick frost layer formed on evaporator
Analysis of Trouble
If a direct cooling refrigerator is to be used for a prolonged period of time ,be sure to defrost its
evaporator regularly ;if you fail to do so ,the frost layer on the evaporator tubing will become thicker
and thicker .Heat conduction will be severely affected when the whole tubing is wrapped with a
transparent ice layer ,and finally the temperature in the refrigerator cannot drop down to the
prescribed range .
Remedy Turn the refrigerator off, and make preparations for defrosting ,open the refrigerator door to
let the air come in ,or use a fan to speed up air flowing so as to shorten the time needed for
defrosting .Never strike the frost layer with any iron tools or wood stick in order to avoid damage to
the evaporator tubing .
6) Refrigerating oil left in evaporator tubing
Analysis of Trouble During the process of refrigerating cycles, a little refrigerating oil may remain in
the evaporator tubing and after a longer time of operation ,if there is considerable refrigerating oil left
in the evaporator ,the heat conduction effect will be severely affected ,thus causing a poor
refrigerating effect .
Remedy It is quite difficult to determine whether this trouble is caused by the refrigerating oil left in
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