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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 the evaporator tubing ,because this kind of
Maintenance Service and Trouble Shooting
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