Haier 102102429 Service Manual - page 21

21 

Analysis of Trouble 

Low efficiency of a refrigerating compressor refers to the actual 

reduction of gas discharge capacity ,and hence the corresponding 

reduction of refrigerating capacity ,under the condition that the refrigerant in 

the system is unchanged .This phenomenon occurs mostly when the 

compressor has been used for quite a long time ,its moving parts have 

worn to a considerable degree ,fit clearance between various parts have 

increased and sealing property of its gas valve has deteriorated ,resulting 

in an decrease in its actual gas discharge capacity . 

Methods of Judgment 

Measure the high and low pressures with pressure gauges to see 

whether they are normal .If an abnormal sound comes from the compressor 

or the temperature of its causing is too high ,Cut the discharge port open 

and operate the compressor ,feel it if there is pressure at the discharge port 

with your finger (For a normal compressor ,its discharge port is difficult to 

be blocked with your finger if you just apply a little effort). 

5)  Too thick frost layer formed on evaporator 

Analysis of Trouble 

If a direct cooling refrigerator is to be used for a prolonged period of 

time ,be sure to defrost its evaporator regularly ;if you fail to do so ,the frost 

layer on the evaporator tubing will become thicker and thicker .Heat 

conduction will be severely affected when the whole tubing is wrapped with 

a transparent ice layer ,and finally the temperature in the refrigerator 

cannot drop down to the prescribed range . 

Remedy 

Turn the refrigerator off ,and make preparations for defrosting ,open the 

refrigerator 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 

Maintenance Service and Trouble Shooting