Haier 102102429 User Manual - Page 20

Maintenance Service and Trouble Shooting 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 20