SERVICE MANUAL
Model: HRF-663ISB2
29
Issue
2010-01
Rev.
Ref1001S015V0
make a hasty conclusion based on only one abnormal phenomenon .It is advisable to find out two or
more abnormal phenomenon ,or conduct troubleshooting comprehensively with the aid of
instruments or other ways ,because several kinds of troubles may share a common abnormal
phenomenon ,and two or more abnormal phenomena may occur simultaneously due to a certain
trouble .With this method ,you can reject some suspicious troubles and finally make a correct
judgment .
8-3 Analysis of Troubles and Troubleshooting
8-3-1 Poor Refrigerating Effect
The so-called “poor refrigerating effect “ refers to the fact that the refrigerator can operate and
refrigerator normally ,but the temperature in the refrigerator cannot drop to the prescribed value
under the stipulated working conditions .In view of there are many causes for this phenomenon ,we
are going to discuss and analyze it in the following 7 aspects :
1) Leakage of refrigerant
Analysis of Trouble
The leakage of refrigerant in the system will result in an insufficient refrigerating capacity ,the
resulting phenomena are its lower gas suction pressure and exhaust pressure as well as higher
exhaust gas temperature .The exhaust tube feels rather hot ,and a continuous gas flowing sound
louder than usual can be heard at the outlet of the capillary ,and no frost or a smaller quantity of loose
frost appears on the evaporator .After shut down ,the balance pressure in the system is usually lower
than the saturation pressure corresponding to the same ambient temperature .
Remedy
In case there is leakage of refrigerant from the system, do not hurry to recharge it with refrigerant,
manage to find out leak points immediately, and make a note of from where it leaks ---welding points
and parts .After having them repaired, recharge refrigerant.
There are so many joints and sealed surfaces in a refrigerator ,accordingly ,quite a lot potential leak
points do exist in the system .In troubleshooting ,pay attention to those parts that are liable to
leak ,check main connection points for oil seepage and tubing for cracks .If there is no severer leak
point ,charge the system with nitrogen and detect leak points with the commonly adopted
method ,repair them ,evacuate ,charge the system with refrigerant ,and then turn on the refrigerator
to make a test run .
2) Too much refrigerant charged into the system
Analysis of Trouble
a) In case the amount of refrigerant charged into the system exceeds its nominal capacity ,the
superfluous refrigerant will of course take some space of the evaporator ,thus reducing its
heat-dissipation area and hence the refrigerating efficiency of the system .The abnormal phenomena
caused by this reason are as follows :the gas suction and exhaust pressures are generally higher
than their respective normal values ,the temperature of its condenser is higher and the electric
