SERVICE MANUAL - hyperware ing
Contents
1. t yank at the line pull the plug out gently from the receptacle Don t press the line under the cabinet or step on it Take care not to roll on or damage the supply line when moves the machine from the wall 12 In the case of leakage of inflammable gases like carbon monoxide open the door and windows SERVICE MANUAL Issue 2000 7 24 0907 V Model HRF10WNDWW HRF12WNDWW Rev Ref0907S005 VO Don t pull out or insert the plugs of the appliance 13 Don t touch the refrigeration surface of the freezing compartment when the refrigerator is in operation especially when our hand is wet else we may be glued to the surface 14 Pull out the plug of power supply during clearance or power outage Wait at least five minutes to resume the power supply in order to prevent damage to the compressor caused by continuous restart A Photo used in this manual The illustration and photos used in this Manual may not base on the final design of products which may differ from the products in some way 1 3 How to read this Service Manual 1 3 1 Using Icons Icons are used to attract the attention to specific information The meaning of each icon is described in the table below Note A A note provides information that is not indispensable Caution A A caution is used when there is danger that the reader through incorrect manipulation may damage equipment loose data get an unexpected result or has2. Take off the screws which fixed the central hinge 3 Hold the REF and FRZ door with our hands and drag it 4 slightly and then we could take off the door 2009 7 24 Ref0907S005 VO Issue Rev SERVICE MANUAL Model HRF10WNDWW HRF12WNDWW Chapter 4 Disassembly En 4 1 Refrigeration flow chart 1 Compressor 2Condenser 3Filter drier ACapillary tube oEvaporator 6Fan motor 4 2 Flow of cold air A freezer door B bottle shelf C cold air suction hole D egg box cover E bottle shelf F bottle shelf G vegetable container H bottle shelf I Ref door J FRZ fan motor K wire L evaporator N Ref air passage O vegetable container cover P compressor 2009 7 24 Ref0907S005 VO Issue Rev SERVICE MANUAL Model HRF10WNDWW HRF12WNDWW Chapter 5 Circuit diagram 5 1 Brief principle diagram A plug B switch C lamp D ice maker preparative E valve preparative F thermostat G defrost timer H thermostat I defrost heater J fuse K fan motor L fan motor M overload protector N compressor O PTC Brief Description of Control Principle HRF 12 is the forced air cooling refrigerator with two doors A mechanical type of all the control is generally adopted The thermostat directly controls the start and stop of compressor and hence the refrigerator temperature Low Temperature Compensation in the above schematic diagram When the ambient is below the set temperature the switch will be closed an
3. dimensions H W D mm 1540 600 651 1540 600 726 Depth of open door mm 1245 1320 Net weight Kg 62 68 Packing dimensions H W D mm 1570 655 737 1570 655 812 Gross weight kg 69 75 SERVICE MANUAL 2009 7 24 Ref0907S005 VO Issue Rev Model HRF10WNDWW HRF12WNDWW 2 2 External views A freezer shelf B thermostat C shelf D crisper cover E crisper F door shelf G coke shelf H butter tray 2 3 Function Schedule 1 Air cooling and automatic defrosting 2 Round door design and fashion handles 3 Energy saving 4 Adjustable humidity crisper 5 Isolated food shelf 6 Crisper with adjustable moisture Moisture in the crisper can be adjusted for satisfaction of vegetables and fruits storage SERVICE MANUAL Rev Ref09075005V0 Issue 2009 7 24 Model HRF10WNDWW HRF12WNDWW Chapter 3 Disassembly 3 1 Air passage disassembly Use the Cruciform screwdriver to remove the four screws which fixed the air passage cover Hold the protruding part of the air passage cover with our 2 hands Shake it slightly to loose it and then take off the air passage cover In the disassembly process pay an attention to the cable 3 behind the air passage cover disconnect the cable terminals and then we could disassemble the cover 4 We assemble it according to reverse order SERVICE MANUAL Issue 2009 7 24 Model HRF10WNDWW HRF12W
4. insulation papers shields are properly installed After servicing make the following leakage current checks to prevent the customer from being exposed to shock hazards 1 Leakage Current Cold Check 2 Leakage Current Hot Check 3 Prevention of Electro Static Discharge ESD to Electrostatic Sensitive 1 2 Insurance Test 1 Check if there is any leak of current 2 Cut out the power supply before the repair to avoid an electrical shock hazard 3 Inthe case of a live line test insulating gloves should be worn to avoid potential electrical shock 4 Confirm the rated current voltage and capacity before testing with any kinds of instruments 5 Watch if the upper door is open when we check something at a lower position 6 Take out every part in the cabinet before moving the machine especially things like panels e g glass shelf 7 Please wear intact cotton gloves when repair any parts of the evaporator so that scratches by the sharp fins can be avoided 8 If there is a breakdown with the refrigeration system please surrender the machine to the service center else the leaked refrigerant may pollute the atmosphere 9 The refrigerator use AC of 115V with a frequency of 60Hz 10 A big fluctuation of voltage exceed the range 100 120V may cause a start failure of the refrigerator a burn out of the control panel and compressor or an abnormal sound from the compressor in operation 11 Take care not to damage the supply line Don
5. or by the dirt accumulated gradually inside the filter Sometimes tapping the filter may cause a passage for flowing Touching it with your hand you will feel that it is cooler compared with its temperature in the normal state The same as described in the capillary clogging 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 discharge valve SERVICE MANUAL rue 200074 0907 V Model HRF10WNDWW HRF12WNDWW Rev Ref0907S005 VO to suck and discharge the refrigerant If the valve block is broken the refrigerant can not be discharged and hence no refrigerating can be achieved Method for making judgment It is quite difficult to differentiate this trouble from others because they often have similar symptoms In repairing firstly hear attentively if there is some abnormal sound coming from the compressor sometimes the broken pieces of valve block may strike against the cylinder and feel the compressor casing with your hand to ascertain whether it is too hot this is also helpful to the troubleshooting secondly measure the pressures at the high and low pressure ports of the compressor with pressure gauges if the gas suction valve block is broken the suction pressure gauge pointer will swing violently and the suction pressure is very high whereas when the gas discharge va
6. the circuit voltage is obviously lower than its rated value it will be difficult to start the motor and a hum sound can be heard from it SERVICE MANUAL Issue 2000 7 24 Model HRF10WNDWW HRF12WNDWW Rev Ree Measure the voltage with a voltmeter if it is really too low give directions to the 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 thermal relay sometimes may be open due to the leakage of temperature sensing agent from the temperature sensor Remove the relay cover to check up its contacts if they are open this means that the original setting is not properly set or temperature sensing agent has leaked out of the temperature sensor Try to turn the adjusting stem of this value in the direction of the lower temperature graduation and then check the contacts to see whether they are closed If they are still not closed dismantle the temperature sensing disc and then immerse it into warm water to see whether the contacts actuate if not it can be preliminarily determine that temperature sensing agent has leaked out and it must be replaced with a new thermostat 4 Motor troubles and other electric faults a Motor windings have been burned or short circuited between turns Analysis of Trouble When motor windings have been burned or short circuited between tu
7. 4 Model HRF10WNDWW HRF12WNDWW REV RS Chapter 7 Quick check 7 1 Normal phenomena In a domestic refrigerator there is not only a complicated electric control system but also a refrigerating system that is difficult to discern whether it is in a good working condition Both the systems are related and affect each other If a certain part of a refrigerator works abnormally lts refrigerating efficiency will decrease operation properties will become unstable or even it cannot be used normally for those serious cases Refrigerators are generally of larger volume once troubles appear to send them to a service department is really a tough thing if such is the case the user will always be in suspense sometimes normal phenomena will be erroneously regarded as troubles Therefore before we deal with the topics of frequently occurring troubles of refrigerators and their remedies we should firstly give a brief account of some normal phenomena which are not troubles In case any one of such phenomena occurs there is no need to worry about it and the user can use it at total ease 1 When the compressor of a refrigerator has just stopped running a rumbling sound can be heard from inside its evaporator This is a sound caused by the flowing of refrigerant in the evaporator tubing Because the pressure difference is still greater after the compressor has just stopped running the refrigerant will flow for a certain time therefore this sou
8. NDWW Rev RENS 3 2 Thermostat disassembly Use the Cruciform screwdriver to take off the three 1 screws which fixed the thermostat house Pay an attention to cable connection part in disassembly 2 process disconnect the cable terminals and then we could take off the thermostat house Removed the original thermostat take the new thermostat probe to the zone for Feeling temperature of the thermostat house Then use the Aluminum foil tape to seal the temperature probe The connection of the thermostat C connect to brown 5 cable L connect to red cable and green cable connect to grounding Rev Ref09075005V0 SERVICE MANUAL Rei09078005V0_ Model HRF10WNDWW HRF12WNDWW The insert terminals of the Thermostat cable connect to the defrost timer and Purple cable connect to the lamp 6 seat It must be fixed the defrost timer to the thermostat house with screws Make sure to seal the sponge of the thermostat openings 7 to prevent the cold air leaking 8 We assemble it according to reverse order SERVICE MANUAL 2009 7 24 Ref0907S005 VO Issue Rev Model HRF10WNDWW HRF12WNDWW 3 3 Door disassembly Use the cruciform screwdriver to take off the screws which fixed the top hinge cover and remove the hinge cover Remove the screws which fixed the top hinge And take 2 off the top hinge
9. Order NO Ref0907S005V0 Refrigerator MODEL HRF10WNDWW HRF12WNDWW WARNING This service information is designed for experienced repair technicians only and is not designed for use by the general public It dose not contain warnings and cautions to advice non technical individuals of potential dangers in attempting to service a product Product powered by electricity should by serviced or repaired only by experienced professional technicians Any attempt to service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death 2009 HAIER ELECTRICAL APPLIANCES COR LTD All right reserved Unauthorized copying and distribution is a violation of law Haier Group SERVICE MANUAL Issue 2000 7 24 Model HRF10WNDWW HRF12WNDWW Rew SN Contents Table of Corte vassverk eneeier kender 2 1 General ea aa E EE E E 3 1 1 General guideline 3 1 2 Insurance esterren miiia iini rn ninii arere iiair T a TAREE A ES EER ERE ATESA BREER REEERE 3 1 3 How to read this Service Manual seenstesecacssttcedecescncstsncicasetstncsantednreatnerivetcessemtacs 4 2 Product Feature isissiccossesscsnsssessorsccsesuersssseunsnssssstioessisnsnsessenansetnnorsessunsessescanssesseanrsseces 5 2 1 Specifications 5 29 Este mal views sr eme ba E 7 ee ae seen inde NE end een 7 3 Disassembly and assembly 8 3 1 Air pas
10. causing stronger vibration and noise during its operation b Leveling screws not properly adjusted If the leveling screws on refrigerator legs have not been adjusted properly vibration and noise will still occur even if the refrigerator has been placed on a level ground 2 Abnormal noise from compressor Three suspended spring inside the compressor case are out of balance and strike against the case moreover the wear of compressor parts may cause noise sometimes 3 Resonance of tubing and loosening of parts Improper and compact lying of tubes or the loosening of parts may cause vibration and noise 4 Inspection method To find the sources of noise press the vibration spot with your hand while the refrigerator is in operation and listen attentively whether the vibration becomes weaker or vanishes If the refrigerator has not been levelly placed put a level meter on its top table and adjust the leveling screws on its legs In case noise occurs from the compressor strike different locations 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 7 3 6 Clogging in filter Analysis of Trouble Total clogging of a filter is rarely to occur This trouble is mostly caused by the paste like matter formed from the substances filled into the system or other dust after the refrigerator has been used for a longer time
11. d the heating will work thus ensuring the normal start and operation of refrigerator at lower ambienttemperature in such case the freezer compartment temperature can reach a good point SERVICE MANUAL Issue 2009 7 24 Rev Ref09075005V0 Model HRF10WNDWW HRF12WNDWW Chapter 6 Trouble shooting 6 1 Poor cooling w When the refrigeratordo not get cold at all Check point Indication Cause of trouble Instruction diagnosis Does the refrigerated roon NO Check the power source amp illuminate when the and power cord door is dosed YES Is power x YES lt Does supplied to the gt Freezer thermostat gt m Checkit for continuity NSG compressorrun 7 SS compressor 7 se NO Sa First check defrost timer motor at Th and then rotate the cam manually YES a Defrost imer gt until thesecond click is heard fa OKEY if fan motor runs when the a 5 door is closed No YES YES ET NS YES inupright position check for Starting relay continuity between terminals 2 and 5 NO YES Check for continuity between Overload protector terminals 1 and s NS la YES In upside down position check for Starting relay Po continuity between terminal 2 and 6 NO A g Ss No continuity between terminals Electrolytic capacitor gt If normal resistance drops to 0 SG NM YY temporarily amp then rises to infinit
12. eed its normal value when the compressor has run for a period not too long thus making the protective relay actuate and bring to a stoppage Check up how the air has been left in the refrigerating system Generally there are two possibilities one is that the air has been sucked into the system when repairing due to carelessness or it has not SERVICE MANUAL Issue 2000 7 24 0907 V Model HRF10WNDWW HRF12WNDWW Rev Ref0907S005 VO been purged out totally when evacuating the system the other is that there are leak points at the low pressure end of the refrigerating system Leak points appear mostly in those low temperature parts or assemblies because the evaporation temperature is lower for such low temperature devices especially at the low pressure end it is easier for the air goes into the system Once it has been ascertained that air does exist in the system you have to open the tubing re evacuate it and then charge it with refrigerant 2 Stoppage due to electric troubles a Thermostat is out of control Analysis of Trouble In case the thermostat does not work in its good order or its temperature sensor has not been installed properly frequent stoppage is also likely to occur Try to adjust the temperature sensor s position until the compressor can be started and stopped normally If this cannot be achieved and the stoppage still occurs repeatedly it is most likely that the mechanical parts or contacts are
13. le through checkup step by step because probably there are many causes including those electrical and mechanical 1 Inspect the power supply to see whether it is connected to the compressor circuit Analysis of Trouble In case the compressor cannot be started this will generally exhibit in the power supply circuit for instance power failure poor contact of switch and blown fuse Make a comprehensive analysis of these phenomena fine out its real cause and take correct measures to remove this trouble a Check the input power circuit to see whether where is voltage of the power supply namely the circuit which is connected to the knife switch This can be determined with an avometer or a test pencil If a blown fuse is found ascertain and remove its cause then replace it with a new one of the same specifications b Check the compressor accessories including its thermal protector and relay In case the thermal protector is damaged the compressor cannot be powered on If the relay is out of order the motor will not run and hum sound can be heard from it after the compressor is turned on in that case shut it down immediately otherwise the motor windings will be burned out in case this condition lasts longer c Check the relay contacts and plugs to see if they are perfect and work reliably Poor contact may cause the motor not running or humming 2 Check the circuit voltage to see whether it is normal Analysis of trouble If
14. lter 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 SERVICE MANUAL Issue 2000 7 24 Model HRF10WNDWW HRF12WNDWW Rev RENS 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 ambient temperature this means that most meshes of its screen has been clogged resulting in an obstructed flowing of refrigerant thus causing a drop in tem
15. lve block is broken the discharge pressure gauge pointer will swing drastically and the discharge pressure is very high In the both cases stop the compressor at once and if technique is available open the cylinder cover and check up the valve block repair it or replace it with a new one Sincere forever Haier Group Haier Industrial Park No 1 Haier Road 266101 Qingdao China http www haier com
16. nd is a normal phenomenon 2 A click sound can often be heard from the refrigerator This is a normal sound produced by the pull in or release of the armature of a current deadweight start relay when starting the compressor The compressor motor will produce a slight and uniform sound while it is running This sound is not easy to be heard in the daytime but of course it can be heard distinctly at night 3 The compressor consists of an electric motor and a compressing apparatus During its normal operation the motor s stator core and windings will rise to a temperature in the range of 100 C 110 C and the temperature of the piston and cylinder of the compressing mechanism can also reach as above 100 C due to the heat produced when compressing refrigerant Most of the heat radiates to the air through the compressor casing therefore its casing is generally at a temperature between 85 C 90C it is very hot particularly in summer when the ambient temperature is higher All these are normal phenomena SERVICE MANUAL Issue 2000 7 24 0907 V Model HRF10WNDWW HRF12WNDWW Rev Ref0907S005 VO 4 For the direct cooling refrigerator a kind of irregular crack sound can be often heard when the compressor is running for a certain period of time or has just stopped its running This sound is caused by the stress relief due to expansion and contraction when temperature changes and will not affect the normal application of refrigera
17. ondensers radiation satisfactory Are there any hot foodstuffs in the refrigerator Are there excessive storage foods inside the refrigerator causing interference with the circulation of cold air Is the temperature control knob in a suitable position Is the sealing of the door gasket in good condition SERVICE MANUAL TET Rev Ref09075005V0 Model HRF10WNDWW HRF12WNDWW Check for continuity between terminals 3 and 4 by pressing the door switch F R lever Is it normal Does the fan for circulation of cold air operate NO Faulty door switch Does the fan motor rotate g Pressing of the door when pressing the door switch on the door panel switch lever by hand is in faulty condition Remove foreign material Remove frost Replace the Is the fan blade affected by foreign material or frost Is the motor locking motor Is the fan motor coil short Replace the fan motor circuited Is there heavy frost or ice accumulated to the evaporator Does evaporator get cold when f thermostat is by possed in the F thermostat in faulty condition Replace F thermostat Is the evaporator cooled only partially Is the measured revolution of the after operating for fan motor less than 1 100 rpm more than 30 minutes Defective fan motor faulty rpm Replace the motor Defective freezing cycle unit SERVICE MANUAL rue 20007
18. out of order disassemble the thermostat make a thorough checkup and repair it b Overload of electric motor Analysis of Trouble Probably too many things have been put into the refrigerator and hence the thermal load exceeds its refrigerating capacity or in case the power supply voltage drops considerably the current flowing through the motor will increase drastically making the thermal protector actuate and the fuse blown and hence the motor stops running If the motor is still running continuously in such a case its windings will be burned out Reduce the thermal load pay attention to the variation in voltage of the power 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 new one SERVICE MANUAL Issue 2000 7 24 Model HRF10WNDWW HRF12WNDWW REV RS 3 Sudden stoppage due to other causes Normal Stoppage Start and stop of the compressor is generally controlled by a thermostat When the temperature in the refrigerator reaches its desired value the thermostat will shut down the compressor automatically Never take this normal operation as a trouble care should be taken to differentiate it from other real troubles in servicing 7 3 2 Compressor won t start In case the compressor cannot be started you must find out the origins of this troub
19. part where it is blocked If the evaporation temperature is too high settle this problem with an appropriate quantity of refrigerant 4 No stoppage of compressor due to damaged heat insulation layer inside case body and or door seal Analysis of Trouble When the heat insulation layer inside the case body deteriorates or the door seal is not closely touches the door frame the temperature in the refrigerator will rise and makes the compressor running continuously Check the heat insulation layer for its damaged parts repair it to improve its heat insulation property If the door has deformed or the door seal is not tightly sealed against the case body repair them SERVICE MANUAL rue 200074 0907 V Model HRF10WNDWW HRF12WNDWW Rev Ref0907S005 VO respectively 5 Too much food is placed in the refrigerator or is placed too densely resulting in poor ventilation or poor conditions for temperature sensing and hence no stoppage of the compressor 6 Too high ambient temperature poorer ventilation and heat dissipation make the compressor running without stop 7 3 4 Electric leakage of refrigerator 1 Slight electric leakage Electric insulation has deteriorated due to being affected with damp thus resulting in slight electric leakage 2 Serious electric leakage Refrigerator case has become live due to faults occurred in some electric devices or the erroneous wiring in installing power cord plug or outlet by the
20. perature due to throttling d Feel the temperature of exhaust gas from the refrigerating system the exhaust gas should be very hot and this is the normal working state For those refrigerator with enclosed type of compressor refrigerating system no frost or dew drop will from on the gas suction tube otherwise there is something wrong in the system Frosting and dew condensation may appear for a very short time period when just starting the machine this is a normal phenomenon Because a refrigerator is a combination of several components they are related and have influence on each other In case an abnormal phenomenon has been found through the above mentioned checkups you need not to make a hasty conclusion based on only one abnormal phenomenon lt 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 SERVICE MANUAL Issue 2000 7 24 0907 V Model HRF10WNDWW HRF12WNDWW Rev Ref0907S005 VO 7 3 Analysis of Troubles 7 3 1 Sudden stop of Compressor during Its running The cause of sudden stop of a compressor during its running is mostly that the gas suction pressure and or discharge pres
21. rehensive analysis of trouble characteristics as well as operating conditions for various kinds of refrigerators Three Essentials for Checkup 1 Look a Check the tubing of refrigerating system for cracks and various welding points for leaks if leakage occurs an oil stain can be seen definitely b Check the suction and exhaust pressure values high pressure and low pressure of compressor to see whether they are normal c Check the conditions of frost attached to its evaporator and gas return tube It is abnormal if frost SERVICE MANUAL Issue 2000 7 24 Model HRF10WNDWW HRF12WNDWW REV RS has formed on part of the evaporator or there is no frost attached to it d Pay attention to the speed of temperature drop inside freezer compartment It is abnormal if the speed of temperature drop is obviously slower than the corresponding normal speed e Check the environment to see whether it is suitable for placing a refrigerator f Check refrigerator door seal case table surface and heat insulation layer g Look at the main control board to ascertain if various indication states are normal 2 Listen a Listen to the noises produced when the compressor is running 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 normall
22. ricant clogging in the lubricant oil line or intermittent lubricant oil supply Dirt and other impurities in the lubricant oil will increase its viscosity and cause the shaft to be seized Copper plating may also result in seizing of shaft b Seizing of piston This is caused by too small fit clearance between the piston and cylinder or expansion due to heat Judgment of seizing shaft and piston After the refrigerator has been powered on the compressor will not start and run but a slight hum sound can be heard and several seconds later thermal protective relay will actuate and make the contacts open this process will occur repeatedly but the compressor cannot be started 7 3 3 Compressor won t stop Sometimes the compressor will run continuously for several hours or run without end If the food placed in the refrigerator is not too much there may be the following two situations i the refrigerator very low this means that the control system is probably out of order ii the control system works normally and there are troubles in the refrigerating system or other parts 1 Temperature is set improperly a The temperature control knob is set to the coldest position This position is to be used for fast freezing or continuous running its temperature for power off is too low therefore the compressor won t stop and the temperature in the refrigerator becomes lower and lower b Inspection method check the temperature con
23. rns the fuse will be blown repeatedly and the blowout occurs particularly at the instant when you close the knife switch Check the terminals and the outer casing to see whether they are short circuited and measure the resistance of each phase with an avometer If short circuit occurs or the resistance of a certain phase is low this means that short circuit does exist in the windings and or between turns and insulation layers have been burned or deteriorated A megameter can be used in this inspection too If the insulation resistance is lower than 2 MQ this means that the insulation layer is already breakdown If the motor has been burned repair it or replaced it with a new one b Fault of control relay Analysis of Trouble Overheat burnout or wear of control relay contacts may occur generally All these will cause poor contact in electricity SERVICE MANUAL Issue 2000 7 24 0907 V Model HRF10WNDWW HRF12WNDWW Rev Ref0907S005 VO Dismantle it to repair or replace it with a new one c Poor electric contactor in thermostat Analysis of Trouble Burnout of contactor and leakage of temperature sensing agent may occur generally Replace the old with a new one d Check the terminals for loose connection and electric circuits for other abnormal phenomena 5 Mechanical faults of compressor a Seizing of shaft This phenomenon is caused mostly by poor lubrication such ad insufficient quantity of lub
24. sage disassembly es 8 3 2 thermostat disassembly 9 3 3 Door disassembly eee eee eee eee eee eee eee eee eee eee ee eee ere eee ee eee eee eee rere ree eee eee ee eee eee eee eee eee 11 4 System flow principle ceeceee eee eee ee eeeee tees tees eeeeeeneeenenetaeeeeae tens tenetanaenenenenanenaeaey 12 4 1 Refrigeration flow chart 12 4 5 Flow of cold gress ekenp ent 12 5 Circuit diagrammes een EE ere 13 5 1 Brief principle diagram Pee eee eee eee eee eee eee ee eee eee eee eee eee ee eee ee eee eee eee eee eee eee eee eee 13 6 Trouble shooting 14 6 1 Poor Cooling 14 6 2 No defrosting eee eee eee eee eee eee ee eee eee eee ee eee eee ee eee eee eee eee eee eee eee eee eee eee eee eee eee 15 7 QUICK CHECK aicescantasssscscossedsossssasssossssasnnsesserasessnanesseseantssesuanmasseunedsassanaseseosansseionen sees seeaanns 17 7 1 Normal phenomena ss 17 7 2 Common Troubles in Refrigerators and Their Remedies 18 7 3 Analysis of Troubles TELENETTET LETE Sn ETTE ESTER LEE LOE ROE TELLE FET Ease eee 21 SERVICE MANUAL Issue 2000 7 24 0907 V Model HRF10WNDWW HRF12WNDWW Rev Ref0907S005 VO Chapter 1 General Information 1 1 General Guidelines When servicing observe the original lead dress If a short circuit is found replace all parts which have been overheated or damaged by the short circuit After servicing see to it that all the protective devices such as insulation barriers
25. sure exceed their respective prescribed ranges thus making a pressure operated protective relay shut off the power to the compressor and stop it In the following we discuss mainly the reasons for causing excessively high gas discharge pressure and low suction pressure 1 Stoppage due to excessively high gas discharge pressure a Too much refrigerant charged into the system Analysis of Trouble The phenomenon such as loose frosting and poor refrigerating effect may occur if excessive refrigerant has been charged into the system Superfluous refrigerant will occupy a certain space of the evaporator thus reduce its heat dissipating area and the phenomenon of liquid striking may occur too Meanwhile dew or frost condensation may occur on the gas return tube and the gas discharge pressure will obviously rise when it reaches the threshold value the protective relay will actuate and shut off the power supply to the compressor Open the tubing re evacuate and then charge the system with a proper quantity of refrigerant b Air left in the 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 higher discharged gas temperature the gas discharge tubing is considerably hot when you feel it with your hand and poorer refrigerating effect Furthermore the gas discharge pressure will exc
26. to restart part of a procedure Warning AN A warning is used when there is danger of personal injury Reference A reference guides to find additional information on a specific topic Rev Ref09075005V0 SERVICE MANUAL 2009 7 24 Rev Model HRF10WNDWW HRF12WNDWW Chapter 2 Product Feature 2 1 SPECIFICATIONS fi Photo Commercial brand Type of appliance FS free standing BI built in Gross capacity L 286 343 Defrosting Manual Automatic Automatic Automatic Defrosting water outlet Yes Yes Kind of coolant R134a R600a R134a R134a Voltage frequency 115 60 115 60 Colours SERVICE MANUAL Model HRF10WNDWW HRF12WNDWW Top cover White White Cabinet White White Door glass White White Door frame White White Fascia panel handle White White Door F Flat R Rounded S Streamline S S Hinge r right I left reversible r reversible r reversible Shelves Number 4 4 Tape grill grill Colour White White Adjustable Yes Yes Drawer numbers 1 1 Crisper Transparent Transparent Equipment amp accessories pp Control panel Control panel interior exterior interior interior Thermometer interior exterior interior interior Adjustable thermostat Yes Yes Interior light W 10 10 Adjust feet Front Front Castors Rear Rear Unit
27. tor 7 2 Common Troubles in Refrigerators and Their Remedies Causes for troubles occurring in refrigerators are closely related to the quality of components and workmanship in assembling by manufacturers as whether refrigerators are properly used and maintained The parameters generally used to express the working conditions of a refrigerator include the temperature inside the refrigerator operation rate electric power consumption noise level and other functional indexes If any one of these parameters is beyond its permissible range this indicates that there is a fault or trouble in the refrigerator During the whole service life of a refrigerator the probability of troubles occurring within a union time is called its failure rate Making a comparison between the control circuit system of a refrigerator and its refrigerating system we can find that the failure rate of the former is higher and that of the thermostat is the highest In troubleshooting the first thing you must do is to determine where the trouble comes from the control system or the refrigerating system There is general no trouble indicating instrument mounted on the domestic refrigerator locations and natures of troubles should be determined according to their respective features therefore experience in servicing is very important to troubleshooting Service technicians with rich experience can correctly locate them and take reasonable remedy measures based on their comp
28. trol knob to see whether it is set in the position SERVICE MANUAL rue 200074 Model HRF10WNDWW HRF12WNDWW kr NN coldest 2 Thermostat is malfunctioning and makes the compressor running continuously Analysis of Trouble When the thermostat doesn t work normally it will make the compressor run continuously and hence very low temperature will be achieved in the refrigerator The fault is generally due to the fact that the contacts of the thermostat cannot be released Dismantle the thermostat and make a through checkup if it is totally out of functioning replace it with a new one 3 Evaporation temperature is too high in refrigerating system resulting in lower refrigerating capacity and hence continuous running of compressor Analysis of Trouble Leakage of refrigerant and clogging in a refrigerating system will directly affect its refrigerating capacity Due to the reduction in its refrigerating capacity the refrigerator temperature cannot reach its rated value the thermostat won t work and 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 hotter therefore the thermostat is unable to cut off the power supply to the compressor and stop it If it has been found that the refrigerant in the system is insufficient in quantity recharge it with refrigerant In case clogging occurs disassemble the
29. user This is very dangerous 3 Electric leakage test a Slight electric leakage A tingle sense will be experienced as soon as you touch the metal parts of the refrigerator with your hand When you test them with a test pencil its neon lamp will come on In that case the first thing you need to do is to determine whether the grounding is perfect If the grounding is no problem turn off the refrigerator immediately then check the insulation of electric circuits with an avometer b Serious electric leakage Never touch the case body of the refrigerator its door handle or other metal parts with your hand Test the refrigerator with a test pencil it will light up intensively measure the resistance between the power cord plug and the case body with an avometer the reading will be zero 0Q in the worst case the fuse will be blown Check the 3 prong outlet to see whether the live wire and the null line are inversely connected this makes the ground protection lead out from the power cord plug being connected to the live wire Another possibility is that the live wire and null line of the outdoor power supply circuit have been inversely connected accordingly this makes the null line become a live wire 7 3 5 Stronger vibration and loader noise 1 Refrigerator placed improperly a Uneven ground SERVICE MANUAL rue 200074 Model HRF10WNDWW HRF12WNDWW REV Ree Uneven ground will cause the refrigerator to be placed unsteadily
30. y 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 fi
31. y NO Compressor motor lock inter lay short of motor I Disconnect the power 2 Remove the leads from capreitor and as a precaution discharge it by shorting the terminals with an insulated screw driver The refrigerator remains unchilled YES Faulty compressor unit even after the compressor is compressor operational for more than 30 minutes refrigerator cycle SERVICE MANUAL TET Rev Ref09075005V0 Model HRF10WNDWW HRF12WNDWW 6 2 No defrosting NO Defrosting Check point Indication Cause of trouble Instruction diagnosis Dose defrost timer operate pam Check for the continuity between terminals 1 and 3 Does compressor stop ruming Check for the continuity between WHITE when shaft of defrost of defrost and WHITE lead wires timer is turned clockwise until At room temperature it should be closed its first click is heard Thermal Fuse Check for the continuity between BROWN and WHITE lead wires At room temperature it should be closed Bimetal Thermostat Defrost timer Check contacts of switch blade See page 12 Check for the continuity between RED and WHITE lead wires Defrost heater and p Cold Heater The Freezer and Refrigerated Rooms are not Sufficiently Cold Check point Indication Cause of trouble Instruction diagnosis Does the compressor operate Is the refrigerator installed a sufficient from and direct heat source Is the condition of the c
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