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Maintenance Service and Trouble Shooting   

 

Hums from a fully enclosed aggregate unit is the sound caused by 

 

overload indicating that the motor cannot be started normally ,meanwhile ,a 

 

clattering sound can be heard from inside the start relay ,which is produced 

 

because the start contacts cannot be released normally .A whistling sound 

 

is caused by the high pressure gas flowing out of the crack of the pressure 

 

tube inside the compressor ,and clucks are the sound of striking after the 

 

suspended spring inside the compressor has broken . 

 

During the normal operation of compressor, a slight and uniform hum 

 

sound due to undulation of electric current can be heard generally ,this is a 

 

normal phenomenon .However ,if it sounds like "tong ,tong 

",i.e., an 

 

impact sound inside the compressor ,this means that a large quantity of wet 

 

vapour of refrigerant or refrigerating oil has come into the compressor 

 

cylinder ;if it sounds like "dang ,dang

", a striking sound of metal parts 

 

inside the compressor ,this means that some moving parts have loosened 

 

(note to differentiate this sound from those formed during starting or 

 

stopping the compressor). 

 

b) Listen to the sound caused by the flowing of gas in the evaporator 

 

Open the refrigerator door while the compressor is in operation, incline 

 

your ear and listen attentively the gas flow sound inside the evaporator .If it 

 

sounds like gentle whistling accompanied by a sound similar to water 

 

flowing ,this is the sound produced by the normal circulation of refrigerant 

 

within the evaporator .In case only the gas flowing sound can be heard and 

 

there is no water flowing sound ,this indicates that the refrigerant has 

 

already percolated .If neither the flowing sound nor the gas sounds from 

 

the evaporator can be heard ,this means that the filter or capillary has been 

 

clogged . 

 

3)Touch and Feel 

 

a)      Feel the compressor when running ,its temperature should be 

 

generally less than 90

°

C in the normal state (it may exceed 90

°

C in case 

 

of running for a longer period of time ). 

 

b)      After the compressor has operated normally for 5~10 minutes    , 

 

ouch and feel the condenser ,the temperature of its upper part should be 

 

higher than that of its lower part (or its right part is hotter than its left 

 

part ,depending on the type of condenser coil ),this indicates that the 

 

refrigerant is circulating . If the condenser is not hot ,this means the 

 

leakage of refrigerant .In case the condenser radiates heat for only several 

 

minutes and then cools down ,this means that the filter and capillary have 

 

been clogged .As for the forced air cooling condenser ,hot air will be blown 

 

out of it ; this means that the system is out of order . 

 

c)      Feel the filter's temperature .During the normal operation of 

 

refrigerating system ,the temperature on the filter's surface should be a 

 

little higher than the ambient temperature ;if you touch it with your 

 

hand ,you will have a sense of slight heat .In case dew condensation 

 

appears due to the fact that its temperature is obviously lower than the 

 

 

13 

 

Summary of Contents for HC-698WEN

Page 1: ...Refrigerator Service Manual Models HC 698WEN Features Energy efficiency Micro foam technology Low noise operation Thick insulation for energy efficiency Latest No 2 micro biological technology 0...

Page 2: ...CONTENT 1 Content 1 2 Specifications 3 3 Function Schedule 4 4 System Flow Chart 5 5 Circuit Diagram 6 6 Maintenance Service and Trouble Shooting 7 7 Exploded View 26 8 List of Parts 27 1...

Page 3: ...y Comsumption kwh 24h 1 22kW h 24h Energy Efficiency Class A Total Gross Volume L 550L Gross Freezer Volume L 204L Total Storage Volume L 537L Freezer Storage Volume L 192L Refrigerator Storage Volume...

Page 4: ...Function Schedule Energy efficiency Micro foam technology Low noise operation Thick insulation for energy efficiency Electronic control Vocation mode function Quick freeze mode function Quick cooling...

Page 5: ...System Flow Chart System Flow Chart 1 Schematic diagram of System Flow Chart 2 Brief Description of System Flow Chart Flows in the sequence 1 2 3 4 5 1 5...

Page 6: ...Circuit Diagram Circuit Diagram 1 Schematic Circuit Diagram 6...

Page 7: ...power NO Check and repair according to the section of the compessor doesn t work YES If compressor can run naturally and temperature raising of condenser is very low YES NO Refrigerant leak check and...

Page 8: ...capacity insufficient NO Check and repair according to the section of Cooling capacity is insuffcient YES 1 The thermostat was set at the coldest position 2 The ambient temperature is very high or th...

Page 9: ...ing 3 Cooling capacity is insufficient Cooling capacity is insufficient Is the ambient YES temperature low than 16 C Check the therostat is correct YES NO Does the refrigerant leak siowly Adjust and i...

Page 10: ...1 Maintenance Service and Trouble Shooting 4 The compressor doesn t work The compressor doesn t work Does the refrigerated room lamp illuminate when the door is opened NO Check the power source and po...

Page 11: ...the pressure difference is still greater after the compressor has just stopped running the refrigerant will flow for a certain time therefore this sound is a normal phenomenon 2 A click sound can oft...

Page 12: ...efrigerator locations and natures of troubles should be determined according to their respective features therefore experience in servicing is very important to troubleshooting Service technicians wit...

Page 13: ...d by a sound similar to water flowing this is the sound produced by the normal circulation of refrigerant within the evaporator In case only the gas flowing sound can be heard and there is no water fl...

Page 14: ...y due to a certain trouble With this method you can reject some suspicious troubles and finally make a correct judgment 7 Analysis of Troubles and Troubleshooting A Poor Refrigerating Effect The so ca...

Page 15: ...essive 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 refrige...

Page 16: ...ator 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 transpare...

Page 17: ...rant and seal the charging port B 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...

Page 18: ...t 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...

Page 19: ...gging with dirt 3 Troubles of Compressor a Breakage of gas suction and discharge valve blocks Analysis of Trouble The compressor works by means of the opening and closing of gas suction valve and disc...

Page 20: ...he system Analysis of Trouble The residual air in the system will circulate together with the refrigerant in the system The major symptoms caused by this residual air is higher gas discharge pressure...

Page 21: ...er supply c Abnormal thermal protection Analysis of Trouble The compressor current is within its normal range but the thermal protector actuates repeatedly Remedy Replace the thermal protector with a...

Page 22: ...he user for buying a stabilizer so as to step up the voltage thus normal operation can be achieved 3 Check the thermal relay to see whether its contacts are closed Analysis of Trouble The contacts of...

Page 23: ...caused mostly by poor lubrication such ad insufficient quantity of lubricant clogging in the lubricant oil line or intermittent lubricant oil supply Dirt and other impurities in the lubricant oil will...

Page 24: ...rated value the thermostat won t work thus the compressor runs continuously When the evaporation temperature in the system is too high the temperature sensing agent in the temperature sensor is also h...

Page 25: ...up intensively measure the resistance between the power cord plug and the case body with an avometer the reading will be zero 0 in the worst case the fuse will be blown Check the 3 prong outlet to se...

Page 26: ...ocations on the side surface of its case using a rubber hammer or hand hammer with a wood block in between so as to determine whether the suspended springs are out of balance or being seized H Functio...

Page 27: ...bottle shelf MAG0 114 1 11 503602010270 R glass shelf assembly M9D9 109 4 12 501154510018 R upper drawer M9D9 116 1 13 501154510030 R bottom drawer cover M9D9 118 1 14 501154510017 R bottom drawer M9D...

Page 28: ...rol PCB 50230101002T 1 47 501155810269 main control PCB cover MA00 1D3 1 48 502403010012 inverter signal harness MAG3 507 1 49 502905010144 top hinge assembly MA00 1B3 1 50 501155610032 left hinge cov...

Page 29: ...4 50115371A005 F bottle shelf MAG0 105 1 76 50115561000P F door seal assembly MA00 359 1 77 50370011467H F door assembly 50370011467H 1 78 503355800013 display control PCB NAD8 502 1 79 501155810220...

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