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evacuate the system and finally charge refrigerant.
2) Refrigerating system has been clogged
a) Clogged with Ice
Analysis of Trouble
The dryness treatment for the major parts in the refrigerating system has been performed improperly,
the effect of air purging for the whole system is not good, or the water content in the refrigerant is out
of standard, all these will cause the expansion valve to be clogged with ice .The symptom for this
trouble are as follows :the refrigerator sometimes can refrigerate and sometimes cannot :the
refrigerator compartment works normally at the beginning, but after working for a certain period of
2) Refrigerating system has been clogged
a) Clogged with Ice
Analysis of Trouble
The dryness treatment for the major parts in the refrigerating system has been performed improperly,
the effect of air purging for the whole system is not good, or the water content in the refrigerant is out
of standard, all these will cause the expansion valve to be clogged with ice .The symptom for this
trouble are as follows :the refrigerator sometimes can refrigerate and sometimes cannot :the
refrigerator compartment works normally at the beginning, but after working for a certain period of
time, frosting begins at the clogged position, evaporation temperature reaches below 0°c, water
will accumulate at the narrow part of the capillary and clog it gradually, then frost begins to melt at
the evaporator, no gas flowing sound can be heard, and the gas suction pressure assumes a state
of vacuum .Note that these phenomena will appear intermittently; sometimes, the refrigerator works
well, and sometimes not well .In order to determine whether it is clogged with ice, heat the
suspicious points with hot water to make ice melt, and after a while if a gas flowing sound resulting
from an abrupt gush is heard and the gas suction pressure rises as well, it can be confirmed that the
trouble is caused by ice clogging.
Remedy If there is too much moisture in the refrigerating system, it is advisable to release the
refrigerant, purge the tubing with nitrogen, and then charge the system with the filtered refrigerant.
However, the commonly adopted method is to connect a filter with moisture absorbers (such as
silica-gel, anhydrous calcium chloride) to the refrigerating system so as to filter out the moisture from
the system, then replace the filter, evacuate it again and finally charge the system with refrigerant.
b) Clogged with dirt in capillary Analysis of Trouble
The capillary inlet is a place where coarse-grained dirt or refrigerant oil in the system will tend to
settle down and clog it. In case considerable dirt accumulates there, the whole filter screen may be
blocked totally, making the refrigerant unable to go through. Clogging with dirt exhibits the same
symptoms as that with ice, namely, higher gas suction pressure, lower temperature of discharged
gas, and no gas flowing sound from the evaporator. The difference between the both is as follows: if
the clogging is caused by dirt, tapping the suspicious clogged point (generally in the capillary or the
connection joint of the filter) may cause the refrigerant to flow through partially, resulting in some
corresponding change, whereas in that case if you heat it with a hot towel, no reaction will happen,
no flowing sound can be heard, moreover, there is no periodic change. After rejecting the possibility
of ice clogging, it can be generally considered as the clogging due to dirt .
Remedy Dismantle the system, remove the dry filter from it, purge the tubing with nitrogen, install a
new filter, then evacuate it and finally charge it with refrigerant.
C) Clogging in filter Analysis of Trouble
Total clogging of a filter is rarely to occur. This trouble is mostly caused by the paste-like matter
formed from the substances filled into the system or other dust after the refrigerator has been used
for a longer time, or by the dirt accumulated gradually inside the filter. Sometimes, tapping the filter
the evaporator, no gas flowing sound can be heard, and the gas suction pressure assumes a state
of vacuum .Note that these phenomena will appear intermittently; sometimes, the refrigerator works
well, and sometimes not well .In order to determine whether it is clogged with ice, heat the
suspicious points with hot water to make ice melt, and after a while if a gas flowing sound resulting
from an abrupt gush is heard and the gas suction pressure rises as well, it can be confirmed that the
trouble is caused by ice clogging.
Remedy If there is too much moisture in the refrigerating system, it is advisable to release the
refrigerant, purge the tubing with nitrogen, and then charge the system with the filtered refrigerant.
However, the commonly adopted method is to connect a filter with moisture absorbers (such as
silica-gel, anhydrous calcium chloride) to the refrigerating system so as to filter out the moisture from
the system, then replace the filter, evacuate it again and finally charge the system with refrigerant.
b) Clogged with dirt in capillary Analysis of Trouble
The capillary inlet is a place where coarse-grained dirt or refrigerant oil in the system will tend to
settle down and clog it. In case considerable dirt accumulates there, the whole filter screen may be
blocked totally, making the refrigerant unable to go through. Clogging with dirt exhibits the same
symptoms as that with ice, namely, higher gas suction pressure, lower temperature of discharged
gas, and no gas flowing sound from the evaporator. The difference between the both is as follows: if
the clogging is caused by dirt, tapping the suspicious clogged point (generally in the capillary or the
connection joint of the filter) may cause the refrigerant to flow through partially, resulting in some
corresponding change, whereas in that case if you heat it with a hot towel, no reaction will happen,
no flowing sound can be heard, moreover, there is no periodic change. After rejecting the possibility
of ice clogging, it can be generally considered as the clogging due to dirt .
Remedy Dismantle the system, remove the dry filter from it, purge the tubing with nitrogen, install a
new filter, then evacuate it and finally charge it with refrigerant.
C) Clogging in filter Analysis of Trouble
Total clogging of a filter is rarely to occur. This trouble is mostly caused by the paste-like matter
formed from the substances filled into the system or other dust after the refrigerator has been used
for a longer time, or by the dirt accumulated gradually inside the filter. Sometimes, tapping the filter
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