Haier DW-86L486 After-Sales Service Manual Download

Page: 1 / 42

Internal training document for Haier service

providers. External disclosure is prohibited.

After-sales Service Manual

of Haier Ultra-low

Temperature Freezers

Model

Picture

Model

Picture

DW-86L486/628/

728/828

DW-86L490

DW-86L338/388
A//728(NEW)/72

8J/578J

DW-86W100

DW-86W420

Summary of Contents for DW-86L486

Page 1: ...er service providers External disclosure is prohibited After sales Service Manual of Haier Ultra low Temperature Freezers Model Picture Model Picture DW 86L486 628 728 828 DW 86L490 DW 86L338 388 A 728 NEW 72 8J 578J DW 86W100 DW 86W420 ...

Page 2: ...roduct Improvement Introduction 12 7 Main Technical Parameters of the Product 15 8 Case Prevention Measures Product Use and Daily Maintenance Knowledge 18 9 Schematic Diagram Circuit Diagram 22 10 Specific Control Work Principle and Parameters 23 11 Refrigeration Cycle Prospective and Plan 26 12 Installation Disassembly Process 27 13 Typical Troubles Solutions and Common Q A 29 14 Explosive View 3...

Page 3: ... be connected with the computer The temperature in the freezer is displayed the alarm information is displayed via the computer and it is also possible to control the temperature and monitor if the equipment works properly via the computer it also has the 5V power output function DW 86L578J 728NEW 728J 2 1 8 It has the remote control alarm function and can connect the alarm device to other rooms t...

Page 4: ... the freezer set temperature ambient temperature input voltage can set the high low temperature alarm and the temperature in the freezer and also has the failure alarm function 3 4 2 Adjustable rack design for storing and fetching goods easily 3 4 3 Safety door lock avoid being opened casually 3 4 4 Integrated handle innovation design and compact trundle design flexible and inconvenient 3 4 5 Have...

Page 5: ...Classification 4 4 4 2 Energy saving New Structure Series DW 86L728 NEW 578J 728J Vertical Double door DW 86L490 Vertical Double inner door narrow series DW 86L338 388A 4 3 Horizontal Freezer Series DW 86W100 Horizontal Freezer Series DW 86W420 Front View Internal Structural View Rear View ...

Page 6: ...gh ambient temp Function Silence alarm Partition Incline the partition at 45 to take it out when changing it Rack strip take out the partition firstly when changing then dismantle relevant fixed screws Inner door PU foaming structure External sealing strip of internal door take it out from the fixed slot when changing it Internal sealing strip of internal door take it out from the fixed slot when ...

Page 7: ...ompartment Left protection plate of the compartment Power switch cover plate Fixed cover of main sensor in the refrigerator Clip for fixing stainless steel rack take it out directly when changing Box beam decorative strip Galvanized steel sheet color coating liner Decorative strip of refrigerator door Inner door handle disassemble screws from the rotation center of the handle when changing ...

Page 8: ...sealing strip Balance hole Magnetic control switch box for door opening alarm Internal Door PU foaming structure Sealing strip in internal door take it out from the fixed slot when changing External Door PU foaming structure V IP Sealing strip in external door take it out from the fixed slot when changing Recorder state Air inlet grille Internal door handle disassemble screws on the handle side wh...

Page 9: ...Main control panel Low temperature step up AC contactor Low temperature step down AC contactor Transfor mer Electric control cabinet Wiring board Relay R232 485 serial module Battery switch Remote alarm wiring Power switch Internal door handle Threading hole at the back of the freezer four channel structure Rear threading hole Test hole 2 Test hole 1 5V power output ...

Page 10: ...n between main senor and computer board Connection between heat exchange sensor and computer board Connection between condenser sensor and computer board Connection between ambient temp sensor and display panel Computer test key press the test part to check if all relay lights turn on circularly If not check if the working relay has a failure Network connection Voltage regulating screw Temperature...

Page 11: ...tween main senor and computer board Connection between heat exchange sensor and computer board Connection between condenser sensor and computer board Connection between ambient temp sensor and display panel Computer board test key press the test part to check if all relay lights turn on circularly If not check if the working relay has a failure Remote alarm connection Voltage regulating screw Temp...

Page 12: ...5 4 System Structure Compressor from the back the left is the high temperature stage and the right is the low temperature stage High temp gas liquid separator in the pipe High temp filter Low temp filter Dew prevention pipe High temp condenser Condenser fan Low temp oil separator Low temp pressure control valve ...

Page 13: ...e maximum current borne by the power socket shall exceed 16A and the socket shall be grounded reliably 6 3 4 When you switch on the freezer firstly please turn on the battery switch in the electric control cabinet of the freezer If you want to shut down the freezer for a long time please switch off the power supply and then turn off the switch 6 3 5 The door of the low temperature freezer shall no...

Page 14: ...layed alternatively on the display panel 5 When the ambient temperature sensor has a failure the failure code E0 of the main sensor and the actual temperature are displayed alternatively on the display panel 6 When the heat exchanger sensor has a failure the actual temperature and the failure code E3 of the heat exchanger sensor display alternatively on the display panel When you select 86 and E3 ...

Page 15: ...an ce KΩ Temperatu re Resistan ce KΩ Temperatu re Resistan ce KΩ Temperatu re Resistan ce KΩ 40 63 3 19 17 8 2 5 8 23 2 1 39 59 4 18 16 8 3 5 5 24 2 0 38 55 8 17 15 9 4 5 2 25 1 9 37 52 3 16 15 0 5 5 0 26 1 8 36 49 2 15 14 2 6 4 7 27 1 8 35 46 2 14 13 4 7 4 5 28 1 7 34 43 4 13 12 7 8 4 3 29 1 6 33 40 8 12 12 0 9 4 1 30 1 5 32 38 4 11 11 4 10 3 9 31 1 5 31 36 1 10 10 8 11 3 7 32 1 4 30 34 0 9 10 2 ...

Page 16: ...cal Cueernt 7 5 A 6 A 18 A 8 A 9 A 5 5 A 18 A 6 5 A Interior Dimension W D H 465 630 1165 mm 465 630 1310 mm 590 630 1310 mm 590 630 1310 mm Exterior Dimension W D H 812 893 1846 mm 812 893 1980 mm 945 900 1980 mm 860 900 1980 mm Net Gross Weight 238 278 kg 255 286 kg 290 310 kg 295 335 kg Material External Material Color Coating Cold Plate Steel Internal Material Stainless Steel Heat preservation...

Page 17: ...r Dimension W D H 1035 900 1980 mm 1041 980 1980 mm 1145 980 1980 mm Net Gross Weight 301 323 kg 350 380 kg 380 410 kg Material External Material Color Coating Cold Plate Steel Internal Material Stainless Steel Heat preservation Material VIP CFC Free Foaming Agent Door Thickness 90mm Enclosure Thickness 90mm Outside door sealing structure Two Seal On The Outside Door Seal Strip Four Seal On The Ou...

Page 18: ...H 895 980 1980 mm 1041 980 1980 m m 769 825 1120 mm 2130 870 1020 Net Gross Weight 305 335 345 380 kg 138 160 kg 310 357 Material External Material Color Coating Cold Plate Steel Internal Material Stainless Steel Heat preservation Material VIP CFC Free Foaming Agent Door Thickness 90mm 80mm 80mm Enclosure Thickness 90mm 130mm 140mm Outside door sealing structure Four Seal On The Outside Door Seal ...

Page 19: ...on steps in part 2 you can put goods into the freezer In principle goods to be stored at 60 shall not exceed 1 3 of the container capacity 4 Taboos All low temperature preservation containers shall be low temperature preservation equipment and used for preserving low temperature goods but not for quick freezing high temperature plasma products It is strictly forbidden to put too many relatively ho...

Page 20: ...ture in the system each pipeline port shall be sealed up with adhesive tape immediately after it is cut off so as to prevent from air entering the system and also the pipeline at each port shall be welded completely in 20min 8 5 3 Vacuum pumping 1 Connect the vacuum pump adapter with the public adapter in the middle of the pressure gauge See Fig 2 2 Switch on the vacuum pump for vacuum pumping and...

Page 21: ...r valve shall be switched on slowly to avoid wasting the refrigerant If the pressure of HRB refrigerant is too high and unbearable for a normal steel cylinder HRB refrigerant shall be filled in an oxygen cylinder When using the outlet at the bottom of the steel cylinder shall be blocked so as to avoid refrigerant leakage and then you can use the outlet on the top for charging When the refrigerant ...

Page 22: ...40 160 20 Since Apr 1 2012 DW 86W420 old 180 420 20 14 0 DW 86L288 540 210 20 Since Jan 10 2011 DW 86L288 old 165 385 24 13 5 DW 86L338 570 195 20 DW 86L388 560 235 20 Since Jan 12 2011 DW 86L388 old 95 525 28 14 2 DW 86L388A 550 195 20 DW 86L486 580 280 30 DW 86L490 580 285 20 Since Jan 1 2014 DW 86L490 old 550 285 30 DW 86L628 220 V 90 810 315 30 Since Dec 25 2010 DW 86L628115 V 880 295 30 DW 86...

Page 23: ...assification 22 22 9 Schematic Diagram and Wiring Diagram of the System A Condenser B Dry filter C 1st stage compressor D Capillary E Gas liquid separator F Heat exchanger G Pressure switch H Oil separator I 2nd stage compressor J Evaporator 9 2 Circuit Diagram A B B D F E G I H J C Capillary ...

Page 24: ...ring if no key is operated in 10s which means that the value has been input into the computer Otherwise the setting is invalid The temperature set value for high temperature alarm shall neither be higher than the maximum temperature limit nor lower than the set temperature of 5 4 When the low temperature alarm is set the temperature set value flickers in the temperature setting display area At tha...

Page 25: ...alarm display area will turn on and alarm but the buzzer will not alarm if the ambient temperature exceeds 38 excluding 38 the indicator of Too High Ambient Temperature in the alarm display area will turn on and alarm and the buzzer will also alarm The flickering light alarm will not stop until the failure is cleared you can press Silence to stop the acoustic alarm of the buzzer Then the buzzer ke...

Page 26: ...iation can be adjusted by 2 Thus the temperature display is 82 10 6 Condenser Fan Control When the compressors is on two fans are on when two compressors are off two fans are on or off according to the following circumstances if the ambient temperature is not lower than 20 the two fans will be on if lower than 20 one fan will be on and the other one will be off when the ambient temperature is lowe...

Page 27: ... you do not select a set value the default will be 86 After your selection is valid the relevant function will be implemented Besides the display panel has the memory function 88 is an independent backup system 11 Refrigeration Cycle Prospective and Plan 11 1 Refrigeration Principle The ultra low temperature freezer is equipped with a cascade refrigerating system normally composing of two or more ...

Page 28: ...e battery power switch on this equipment and this switch shall be turned on before the freezer is switched on As long as the switch is on the AC equipment which meets the relevant requirement will work normally When AC power is supplied the equipment will charge the storage battery according to the relevant requirement If the AC power has a failure the storage battery will supply power to the disp...

Page 29: ...r disassembling the front cover of the compartment and open the external door by 180º Regarding the disassembly of the front cover of the compartment please pay attention below Note Normally we do not suggest the disassembly of the front cover of the compartment 12 3 2 Remove the two screws below the front cover of the compartment Disassemble the front cover Refer to Single Page Disassembly pasted...

Page 30: ...ine will not be able to start Thus the user shall check if his circuit is normal D The user sets the temperature as 86 ºC Why does it rise to 82 ºC In order to ensure the service life of the machine our product will be adjusted back to 82 if the set temperature is lower than 82 when the ambient temperature is higher than 35 and also return to the original set value if the ambient temperature is lo...

Page 31: ... is normal Meanwhile observe the surface temperature and abnormal noise of the compressor If the compressor does not heat up or the makes abnormal noise it is damaged and shall be replaced when it is changed the oil separator and the dry filter shall also be changed at the same time 7 Too low voltage of the user Check if the display panel voltage of the product is covered in the rated voltage scal...

Page 32: ...h please install an air conditioner to reduce the ambient temperature 6 Condenser blockage Check if the condenser is dirty and alarms If so please clean the filter screen in time 5 E0 ALARM When the input voltage of the ambient temperature sensor is 4 9V the sensor has an open circuit when 0 1V it has a short circuit 1 Check if the terminal of the ambient temperature sensor is plugged in improperl...

Page 33: ...attery capacity alarm When the capacity of the storage battery is 10 5V the low battery capacity alarm happens 1 Check if the storage battery expires 2 Check if wire terminals on the battery switch are plugged in well or if the switch is damaged 3 Check if the charging circuit is normal After the freezer is switched on for 5min check if there is voltage output from the storage battery terminal on ...

Page 34: ...rms for 15min No Check the buzzer and control circuit on the control panel Check if the input voltage works properly Yes Yes No Check if the low temp compressor is normal Yes Check if the low temp fan is normal Check if the high temp compressor is normal Check if the high temp fan is normal Check if the current of high and low temp compressors are normal Measure the actual temperature in the freez...

Page 35: ...or running 5 Yes No normal Check the control circuit and LED lamps on the display panel The Alarm indicator flickers The Low temp Alarm indicator flickers Yes The freezer makes an acoustic alarm after the lamp flickers and alarms for 15min No Check the buzzer and control circuit on the control panel Check if low high temp compressors work properly Yes No Measure the actual temperature in the freez...

Page 36: ......

Page 37: ... sealing strip of external door 0270200322 A 0070203873 0270200322 0270200174 12 Internal foaming door 0270802495 0270802939 0270802113 0270802091 13 Sealing strip of internal door 0270200579 A 0270200579 B 0270200579 C Upper door 0270200579 C Lower door 0270200579 D 14 Internal door hinge 0070106373 0070106373 0070106373 0070106373 15 Partition stainless steel 0270101224 0270101224 0270100787 027...

Page 38: ...ndenser sensor 0074091225 0074091225 0074091225 0074091225 36 Relay 115V 0074091407 0074091407 37 Relay 220V 0034000993 0034000993 0034000993 0034000993 38 AC contact 115V 0074091406 0074091406 39 AC contact 220V 0074090871 0074090871 0074090871 0074090871 40 Transformer 0274000099 0274000099 0274000099 0274000099 41 Remote alarm terminal strip 0274300008 0274300008 0274300008 0274300008 42 Power ...

Page 39: ...aming door 0270802452 0270803180 0270802169 10 External sealing strip of external door 0270200538 0270200651 0270200538A 11 Internal sealing strip of external door 0270200322B 0270200652 0270200322C 12 Internal foaming door 0270803216 0270801321 0270802170 13 Sealing strip of internal door 0270200579E 0270200653 0270200579 14 Internal door hinge 0070106373 0270101381 0070106373 15 Partition stainl...

Page 40: ...9 0274000099 41 Remote alarm terminal strip 0274300008 0274300008 0274300008 42 Power line terminal strip 0274300007 0274300007 0274300007 43 Filter 0074600001A 0074600001A 0074600001A 44 Main control panel middle 0271800023 0271800023 0271800023 45 Main control panel low end 0074091319 before June 30 2014 0074091319 before June 30 2014 0074091319 before June 30 2014 46 Display panel middle 027180...

Page 41: ...200651 0270200434 0070203836 11 Internal sealing strip of external door 0270200652 B 0270200652 0070203714 12 Internal foaming door 0270803150 0270801321 0270802220 0270802766 13 Sealing strip of internal door 0270200592 A 0270200653 14 Internal door hinge 0270101381 0270101381 15 Partition stainless steel 0270101712 A 0270101535 16 Rack clip stainless steel 0270100175 0270100175 17 Beam stainless...

Page 42: ...99 0274000099 0274000099 0274000099 41 Remote alarm terminal strip 0274300008 0274300008 0274300008 0274300008 42 Power line terminal strip 0274300007 0274300007 0274300007 0274300007 43 Filter 0074600001 A 0074600001 A 44 Main control panel middle 0271800023 0271800023 45 Main control panel low end 0074091319 0074091319 46 Display panel middle 0271800024 0271800024 47 Display panel low end 007409...

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