Haier 102102429 Service Manual - page 20

20 

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 current of the 

compressor rises ,loose frost forms on the evaporator ,the refrigerator 

temperature drops slowly ,and frost appears on the gas return tube . 

b) In case excessive refrigerant has been charged ,the liquid 

refrigerant that cannot evaporates in the evaporator will return to the 

compressor ,and thus a phenomenon of “liquid striking” will occur .The 

liquid refrigerant evaporates and effervesces as soon as it flows into the 

refrigerating oil at the bottom of compressor .If the condition is 

severe ,foams will fill all over inside the compressor housing and be sucked 

by the piston ,causing damage to the components of compressor . 

Remedy 

According to the operating procedures ,it is mandatory to turn the 

machine off ,and several minutes later ,open the refrigerant charging tube 

and let the refrigerant escape from it ,replace the dry filter ,recharge 

refrigerant after evacuating ,and then seal the charging port . 

3)  There is air left in the refrigerating system 

Analysis of Trouble 

Residual air in the refrigerating system will reduce its refrigerating 

efficiency .The prominent phenomena are the increase in its gas suction 

and exhaust pressures (however ,the gas exhaust pressure will not exceed 

its rated value ),obvious increase in temperature in the segment from the 

compressor outlet to the condenser inlet .Because there is air in the 

system ,both the gas exhaust pressure and temperature will rise ,and 

moreover ,the gas flowing sound is intermittent and obviously louder . 

Remedy 

After shut down for several minutes ,open the tubing ,evacuate it and 

then recharge the system with refrigerant . 

4)  Low efficiency of compressor 

Maintenance Service and Trouble Shooting