Haier HRF-660S Service Manual page 32

SERVICE MANUAL
Model:HRF-660S
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
nay cause a passage for flowing, Touching it with your hand, you will feel that it is cooler compared
with its temperature in the normal state.
Remedy
The same as described in the capillary clogging with dirt.
3) Troubles of Compressor
a) Breakage of gas suction and discharge valve blocks
Analysis of Trouble
The compressor works by means of the opening and closing of gas suction valve and discharge
valve to suck and discharge the refrigerant. If the valve block is broken, the refrigerant cannot be
discharged, and hence no refrigerating can be achieved.
Issue 201001
Rev.
Ref1001S008V0
32