No Refrigerating - Haier HRF-660S Service Manual

SERVICE MANUAL
Model:HRF-660S

8-3-2 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, too. 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
Analysis of Trouble
Leak points in the refrigerating system have not been found and repaired timely ,thus resulting in the
total escape of refrigerant .There are two kinds of leakage :I) slow leakage for instance ,when we
want to use a refrigerator that has been put out of quite a long time ,we find the leakage of
refrigerant ,or in the course of its operation ,we have found that the refrigerator is gradually becoming
not so cold and finally no refrigerating cab be achieved ; ii) fast leakage in that case ,all the
refrigerant will escape swiftly due to abrupt rupture of system tubing .
Symptoms of total leakage of refrigerant are mainly as follows: the Maintenance Service and Trouble
Shooting compressor can be started easily (if there is no damage to the compressor parts) and its
operating current becomes low, its gas suction pressure is high and discharge pressure is lower, the
gas discharge tube feels rather cold, no sound of gas eruption from the liquid in the evaporator can
be heard, and no will gush out of the process tube if you cut it open after shutdown.
Remedy
Check the whole machine, particularly those locations which are liable to leak .After leak points have
been found, repair them or replace them with new parts according to specific circumstances, then
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
time ,frosting begins at the clogged position ,evaporation temperature reaches below 0 , 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
Issue 201001
Rev.
Ref1001S008V0
31