Maintenance Service and Trouble Shooting
Remedy
Turn the refrigerator off, and make preparations for defrosting ,open the wine cooler
glass 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 phenomenon and other several trouble
are tends to be confused. Generally speaking, you can make a judgment based on the
frost formed on the evaporator .If the frost does not cover the evaporator, and
moreover, it is loosely formed, you can make a judgment that the deterioration of
Refrigerating effect is due to the accumulation of refrigerating oil left in the evaporator
tubing in case no other troubles have been found. To clear off refrigerating oil left in the
evaporator. Dismantle the evaporator, purge it thoroughly and then dry it .In case it is
difficult to dismantle it, charge refrigerant from the evaporator inlet to wash it several
times. then purge and dry it with nitrogen.
7) Flowing obstructed in refrigerating system
Analysis of Trouble
Because the refrigerating system was originally not purged thoroughly, some of the
filter screen meshes have been clogged by dirt accumulated in the filter after using it
for a certain time of period. Thus resulting in a decrease in flow rate, and hence a
poorer refrigerating effect.
The abnormal phenomena caused by this kind of slight clogging in the system are as
follows: the gas discharge pressure is lower .the temperature of discharged gas drops
down .the position clogged has a temperature lower than that in normal conditions, and
for a severe clogging, even dew condensation as frosting may appear.
Remedy
Purge the tubing, and after replacing the dry filter with a new one or clearing it
thoroughly, recharge the system with refrigerant and seal the charging port.
B. No Refrigerating
The phenomenon that the compressor runs normally. but no frost (or only a little frost )
appears on the evaporator ,and the refrigerator temperature does not drop down is
called "no refrigerating". There are many causes for this trouble and it is relatively
complicated, in servicing. Special attention to finding direct causes for this
phenomenon. Three main potential causes for this trouble are analyzed below:
1) All refrigerant in the system has leaked out
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