Service Manual Deep Freezer-upright DW-40L508/348/278 Haier Medical & Laboratory Products Co., Ltd.
Effective models This service manual is effective for following models Model name Product code Voltage(V) Frequency(Hz) Plug-type DW-40L278 BE0F1EE1T 220-240 50/60 European DW-40L348 BE0GB2E0N 220-240 50 European BE05T7E1T European BE05T5E1T British flat DW-40L508 BE05T8E1T 220-240 50 British round BE05T9E1T European BE05T3B1T 60 British flat 2 / 35
Content Designation... 4 Safe Caution... 5 Product appearance... 6 Product Specifications... 8 Components and Function Modules... 9 Disassemble Steps... 12 Screen Control System... 13 Control System Principle... 15 System Schematic Diagram... 16 System Circuit Diagram... 17 Inspection and Maintenance Process for Typical Error... 18 FAQ&A... 19 Cooling unit parts... 20 product nameplate... 21 Fault code... 22 Refrigerant perfusion Details... 23 Troubleshooting... 24 How to deal with poor cooling... 25 Spare Parts List... 26 3 / 35
Designation Regulations for type naming: DW XX X XXX X Design No. is expressed with pinyin character sequence Rated volume value is shown with L Classification of low temperature cabinet (W is horizontal and L is vertical) It shows the temperature at the characteristic point inside cabinet (without minus mark) (For example: temperature at the characteristic point inside cabinet -40 can be expressed as 40) Low temperature cabinet Deep temperature cabinet Note: rated volume can be the gross volume or effective volume; the manufacturer can decide it by him according to the actual situation. The effective volume value must be marked on the nameplate whether effective volume or gross volume is marked in the product name. Examples: DW-40L348 means that the Deep temperature storage refrigerator with the temperature at characteristic temperature -40, horizontal and rated effective volume 348L. 4 / 35
Safe Caution 1. The machine is using an AC 220-240V/50/60Hz power. If the voltage used is 10% higher or lower than rated voltage,an auto stabilizer above 4000W shall be equipped. Power line that required for lengthening shall be with a cross section no less than 1.5mm. 2. An independent private jack shall be used and reliably connected. The power line for refrigerator is equipped with three-wire, grounding-type plug which meets standard three-wire, grounding-type receptacle. In no circumstance should the third plug foot (grounding) of the power line be cut or removed. The plug shall be touchable after installation of refrigerator. Power line or plug with abrasion shall not be used. Abraded or damaged power line shall be sent to maintenance point designated by the manufacturer or be replaced by qualified personnel. 3. Hazardous articles of inflammable, explosive, materials such as acid and alkali with strong corrosion are prohibited in the refrigerator. 4. Please don t use flammable spray closely to avid fire. 5. When there is inflammable gas such as coal gas leakage: Shut the valve for leakage; Open the door and window for ventilation; Don t pull out or insert power plug of the freezer. 6. Prevent children playing in the freezer to avoid accident. 7. Once the power of the freezer is cut, it shall be re-connected at least five minutes later to avoid damage on compressor or the system. The power shall be cut for maintenance. Do not roll or damage the power line. 8. Please wear protective equipments during accessing to the freezer to avoid freezing injury. When the freezer is scrapped, please remove the doorman. The scrapped freezer shall be away from fire and be sent to appointed site for disposition. 5 / 35
Product appearance DW-40L508 DW-40L348 6 / 35
DW-40L278 7 / 35
Product Specifications 8 / 35
Components and Function Modules 1. Temperature control It is controlled by microcomputer with digital display for temperature while the inner temperature can be adjusted from -20 ~ -40 ; there is parameter setting for super low temperature alarming and break down memory. 2. Safety system Alarm:high/low temperature alarm, sensor error alarm,power failure alarm,low battery alarm,high ambient temperature alarm,door opening alarm(only applicable to DW-40L278) 2 alarming methods (sound buzzing alarming, red light alarming) Starting up delay protection function 3. Refrigerating system Imported famous brand SECOP compressor is adopted Environment protection free refrigerant German famous brand EBM fan High density insulation layer with heat preservation The evaporimeter is used as rack directly for speed refrigeration. 4. Humanity design Drawer design for convenient utilization LED digital temperature display for convenient observation Broad voltage belt suitable for voltage Doorknob design for easy on and off Trundle design for convenient motion Gate locks design for safe storage 5. Product graphical representation 9 / 35
DW-40L348/508 10 / 35
DW-40L278 Remark: The drawers in the upper and lower cabins of DW-40L348 are the same, and those of DW-40L508 are different. The press is located in the cabin on rear bottom of the freezer with cabin cover The condenser is located at rear of the freezer. The evaporimeter is located inside the refrigerator as rack. 11 / 35
Disassemble Steps 1. Matters needs attention during replacement The rivet nut shall not be pulled tightly; Omitting or lacking PS spacers; Forget spring washer; 2. Self-checking items after replacement Whether the rivet nut is tight; Whether two PS spacers are used; Whether spring washer is used; 3. Disassemble steps for control board Unscrew the following screws on top side, the control board can be fetched. TOP Attention: there are wires connecting control panel and refrigerator as shown in following: 4. Installation steps for control board Installation shall be according to 4-4 disassembly steps oppositively. 12 / 35
1 External view of computer board Screen Control System 2 Basic parameters for computer board Rated frequency 50/60Hz Rated voltage 220-240 A.C Control current for press under normal operation shall be no more than 10A The 5 minutes start delay for the first energization of press has change to 30S only in new machine. In normal operation, each time it is shut down, start timing, the compressor will not start if the start up time is less than 5 minutes; if the time is over 5 minutes, please take the actual time for operation. 3 Temperature display function The display range is from +50 to -60, with temperature higher than +50, displaying 50 ; with temperature lower than -60, displaying -60. 5 Overheat alarming function When the actual temperature sensed by the sensor is higher +5 higher or lower than set temperature, the overheat alarming light will flicker (with interval of 1S), accompanies by buzzing (with interval of 0.5S). Press the buzzing releasing button to release buzzing; but the red light will keep on flickering (press again can not recover buzzing. It is only when the temperature is within +5 upper or lower than set temperature or cut the power, the buzzing releasing button can reset to recover buzzing function). Note: if the freezing sensor is in error, the red light may keep on flickering with interval of 1S and alarming fail. 6 Recovery processing and error display of freezing sensor When the freezing sensor is in error (short circuit or open circuit), the temperature value displayed will be F1 ; the frozen food cabinet enters protecting mode and compressor is in fixed alternation of 20min on and 5min off with alarming in failure; if the refrigerator is in quick-freeze status, quit (the corresponding light will be off). 7 Break down memory function When the frozen food cabinet is broken down and electrified again, the memory function can operate according to status set before breaking down. Display control>quick freeze>normal control F1 display >temperature display 8 Temperature adjustment principle and alignment This machine adopts microcomputer controlled temperature control system to control on-off of the press. 13 / 35
In electrified condition, the screen may display current temperature. If you want to change the set temperature, for example, change from -30 to -35, please operate as following: Operation of the control system(dw-40l508) 1 Unlock Press button for at least 5s,The display panel will show F0,bit 0 flash,then press button,the display panel show F1, Then press button,all the key are unlocked, then the display panel will show the actual temperature of the cabin If no operation for 10s,the keys will be locked 2 Temperature setting At Unlocked status,press button,the display panel will show L0, Bit 0 flash,press button again,it will show the set value, the second bit of the set value will flash Press button to change the bit,then press,to change the value to -40 degree,or another value you need 3 Temperature Calibration At unlocked status,press button and button at the same time for at least 5s,the display will show the value of calibrate, For example: the display value is-40,the real temp is -35,we can input +5,then the LED will show -35,the range of calibration is -5 to +5 14 / 35
Control System Principle 1 Working principle for press on and off When inner temperature reaches set temperature, induct the temperature by sensor and change into electrical signal which is sent to control chip of computer board. By pre-set procedure, the chip then sends out stop order to compressor to shut it down. When the inner temperature is returned 1 higher than set temperature, the chip sends out stop order via the same procedure to shut the compressor down. (If temperature return in the freezer is too fast, less than 5 minutes, then take it as 5 minutes.) 2 Working principle for fan on and off The fan is in synchronous operation with the compressor. Please refer to 6-1 press working principle for fan working principle. 15 / 35
System Schematic Diagram DW-40L348/508 DW-40L278 16 / 35
System Circuit Diagram 17 / 35
Inspection and Maintenance Process for Typical Error Problem points Reason analysis Maintenance measures 1. the press can not start 1. The fuse is burned out. Change the fuse 2. High temperature inside the freezer 3. The screen doesn t display temperature. It displays E6. 2. Connecting parts of cabinet is damaged. 3. The connecting line for electric cabinet is not in right position. 4. The temperature controller is in error. 5. The starter or thermal protector is damaged. Change socket connector. 6. The press is in error. Change press. 1. The set temperature is high. Reset Install correctly after inspection. Adjust parameters. If the temperature controller is damaged, change it. Change the starter or thermal protector. 2. The freezing agent is leaking. Find leaking point and weld. Refill freezing agent. 3. The temperature controller is damaged. 4. The capillary or system is dirt and stopped. 1. The temperature-sensing probe is in short or open circuit. 2. Without temperature sensing probe. Change the temperature controller. Clean capillary or change filter. Inspect the temperature sensing probe. Install temperature sensing probe. 4. Big noise 1. The freezer is not even. Change position of the freezer. 2. Sympathetic vibration between pipelines or freezers when press operating. 3. Fan and fan bracket is loosen. Re-fix 3. Connection bolts of the press is loosened. Clear up the pipelines to avoid sympathetic vibration. Tight the inner connecting bolts. 18 / 35
FAQ&A Question Answers Measures able to adopt 1. Inner temperature is too high or too low. Can be resolved by adjusting and control of temperature. See detailed operation in instruction manual. 2. Sides of the freezer is hot. There is anticoagulant near freezer open on side surface. Heating is normal instead an error. Can turn off the electric heating switch. 3. There is difference between displayed temperature and detected temperature. The displayed temperature is temperature on sensing probe. It is normal to has difference with that of the freezer. Normal situation needs no resolution. 4. The alarming rings in short time after start up. Alarm when the inner temperature in within alarming region. Normal situation needs no resolution. Why there is serious frosting in DW-40L508 series? Answer: it may caused by loosen door or frequent opening the door, or one of the small hole allowing condenser to enter the freezer is not plugged up. This needs to be disposed by service persons. Moreover, regular defrosting is required to keep better effect, normally once per 1-2 months. Error of DW-40L508 series sensors and how does press operate? Answer: During the operation of DW-40L508 low temperature reserving box, when the freezing sensor is in error (short circuit or open circuit), the temperature value displayed will be E6 ; the frozen food cabinet enters protecting mode and compressor is in fixed alternation of 20min on and 5min off with alarming in failure; if the freezer is in quick-freeze status, quit (the corresponding light will be off). What is the temperature setting range for DW-40L508 series machine? Answer: the set range is -20~-40. 19 / 35
Cooling unit parts Part decripetion parameter Models 参数 compressor Secop/Danfoss SC21CL power DW-40L508/348 220-240V/50Hz Start capacitance 117-7040(80uF) compressor Secop/Danfoss SC18CLX.2 power DW-40L508 208-230V/60Hz Start capacitance 117-7066(80uF) compressor Secop/Danfoss SC12CLX.2 power DW-40L278 220-240V/50Hz/60Hz Start capacitance 117U5019(80uF) Refrigerant DW-40L508/348/278 R404a Fan motor DW-40L508/348/278 EBM AC230V/50/60Hz, Display panel DW-40L508/348/278 0071800050C,Haier PCB control panel DW-40L508/348/278 0071800049C,Haier PCB 20 / 35
product nameplate For example: 21 / 35
Fault code Ambient temperature sensor fault code E0 Low battery fault code E5 Inside the main sensor fault code E6 High Temperature alarm code E9 Low temperature alarm code E10 Ambient temperature is too high alarm code E14 22 / 35
Refrigerant perfusion Details Type DW-40L278 DW-40L348 DW-40L508 R404a 215g 196g 245g [Note] refrigerant type and weight of the nameplate subject shall not misuse of refrigerant. 23 / 35
Troubleshooting Fault Analysis Maintenance Measures 1. Machine storehouse wiring connector plugs s are damaged Change the connector plugs 2. Bas wire contact Check contact and make in good condition. Checking if it is due to bad 3. Display panel connection failure 1. compressor fails to start connection, otherwise, change it. 4. Relay, start capacitor or heat protector is damaged Change the part. 5. Compressor fault Change the compressor 6. User s voltage is too low Add a manostat 1. Fan wiring is loose Checking the wiring 2.Fan does not rotate 2. Fan blades are blocked by foreign matters Checking and clean them 3. Fan is damaged Change parts 1. The temperature setting of outage is too high. Re-set computer board 3.High temperature in cabinet 2. Refrigerant leaks. 3.Temperature probe is damaged 4. Capillary tube or system is blocked by dirt\ greasy 5. High ambient temperature Find leak location and make repair welding. Infuse refrigerant again. Change parts Clean the capillary tube or change filter. Turn on air-conditioner,reduce ambient temperature. 6. Condenser blockage Clean condenser 4.Display board displays E6 1. Temperature probe short circuit or disconnect Checking the temperature probe 2.No temperature probe Install a temperature probe 24 / 35
How to deal with poor cooling Freezer temperature high temperature alarm set temperature (high temperature alarm set temperature run set temperature +5 C) High temperature alarm Lights flashing Check the display board LED lights and control circuit After 15 minutes flashing alarm, sound alarm Check the control panel buzzer and control circuits Test Input voltage display is normal Check the power is normal Low-temperature stage compressor is normal Check the compressor and control circuit Low-temperature stage fan is normal Check the fan and the control circuit High-temperature stage fan is normal Check the fan and the control circuit High-temperature stage compressor is normal Check the compressor and control circuit Check whether there is a refrigerant leakage, repair leakage 25 / 35
Spare Parts List DW-40L278 Exploded view DW-40L278spare part list No Part code Name Qty Remark 1 0270100499 Top cover 1 2 0271800064 USB board 1 Optional 3 0074091430A Battery 1 4 0034000993 Relay 220V 1 5 0074090950 Wire connecting board 1 6 0071800049C Control board 1 7 0270101421 Electric support 1 8 0070401235 Battery switch 1 9 0270101384 Back cover of the electrical box 1 10 0270400062 Power cable (European type) 1 26 / 35
11 0270802659 Main body 1 12 0270801061 Lock assy 1 13 0270200560 Lock cover 1 14 0270100482 Back cover of cabin 1 15 0070701061 Drier filter 1 16 0270100082 Filter support 1 17 0274000190 Compressor SC12CLX.2 1 220V/50/60Hz 17 0274000380 Compressor NLE12.6CNL 1 After 2017.2.16 18 0270101748 Bottom fix board of compressor 1 19 0270101786 Back castor fix support 1 20 0270100483 Front castor support 1 21 0270800056 Front castor 2 22 0074090858 Fan-motor 1 23 0071220036 Fan support 1 24 0070701642 Condenser 2 25 0270101747 Front cover 1 26 0074090520 Temp recorder 1 Optional 27 0070106170 Door support 1 28 0270100398 Lower hinge support 1 29 0270100380 Lower hinge 1 30 0270802653 Door 1 31 0270200538F Outer gasket 1 32 0270200607B Inner gasket 1 33 0270101276 Lock ring 1 34 0270801098 Handle 1 35 0270700281 Evaporator 1 36 0270200183 Drawer 6 37 0270101174 Lock 1 38 0074090530 Door ajar switch 1 39 0270101746 Upper front cover 1 40 0270200033 Display panel support 1 41 0071800050C Display board 1 42 0270200604B Seal for top cover 1 43 0270101754 Upper panel Support 2 Old version 44 0270100378 Upper hinge 1 27 / 35
DW-40L348 exploded view DW-40L348 spare part list No. Part code Name Qty Remark 1 0071800050C Display board 1 2 0270102132 Upper front cover 1 3 0270801087 Upper door 1 4 0270801098 Handle 2 5 0270801090 Lower door 1 6 0270101548 Front cover of cabin 1 7 0074090520 Temperature recorder 1 Optional 8 0070701642 Condenser 2 9 0074090858 Fan 1 10 0274000065 Solenoid valve 1 11 0074090620 Compressor SC21CL 1 Before 2017.2.16 11 0274000380 Compressor NLE12.6CNL 1 After 2017.2.16 12 0070701061 Drier filter 1 13 0270101389 Back cover of cabin 1 14 0270100380 Lower hinge 1 15 0270100379 Middle hinge 1 28 / 35
16 0270801081 Main body 1 17 0070400331 Power cord 1 18 0070401235 Battery switch 1 19 0274000239 Power switch 1 20 0034000993 Relay 1 21 0271800065 Solenoid valve control board 1 22 0074091430A Battery 1 23 0270100405 Top cover 1 24 0071800049C Main board 1 25 0271800064 USB board 1 Optional 26 0270100378 Upper hinge 1 27 0270700226 Condenser 1 28 0270200602 Drawer 12 29 0270200608 Outer gasket 2 30 0270200607 Inner gasket 2 31 0270101276 Lock ring 2 32 0270200560 Lock cover 2 33 0270801061 Lock assy 2 DW-40L508exploded view 29 / 35
DW-40L508spare part list NO. Part code Name Qty Remark 1 0071800050C Display board 1 2 0270102132 Upper front cover 1 3 0270800397 Upper door 1 4 0270801098 Handle 2 5 0270800398 Lower door 1 6 0270100397 Front cover of cabin 1 7 0074090520 Temperature recorder 1 Optional 8 0070701642 Condenser 2 9 0074090858 Fan 1 10 0274000065 Solenoid valve 1 11 0074090620 compressorsc21cl 1 Before 2017.2.16 11 0274000380 Compressor NLE12.6CNL 1 After 2017.2.16 12 0070701061 Drier filter 1 13 0270100402 Back cover of cabin 1 14 0270100380 Lower hinge 1 15 0270100379 Middle hinge 1 16 0270800011 Main body 1 17 0070400331 Power cord 1 30 / 35
18 0070401235 Battery switch 1 19 0274000239 Power switch 1 20 0034000993 Relay 1 21 0271800065 solenoid valve control board 1 22 0074091430A Battery 1 23 0270100405 Top cover 1 24 0071800049C Control board 1 25 0271800064 USB board 1 Optional 26 0270100378 Upper hinge 1 27 0270700013 Evaporator 1 28 0270200032 Small drawer 6 29 0270200042 Outer gasket 2 30 0270200056 Inner gasket 2 31 0270101276 Lock ring 2 32 0270200560 Lock cover 2 33 0270801061 Lock assy 2 34 0270200024 Big drawer 4 31 / 35
Service bulletin of -40 deep freezer Doc No.:HRYLG20170508 Date:2017-5-8 Author: Mr.Liu Xueliang Upgrading compressor for Deep freezer(dw-40l278/348/508) Regarding to these deep freezer (DW-40L278/348/508), Please follow the below steps to replace a new compressor. Section A Spare part for upgrading compressor: Sheet 1 Spare part list Section B Model No. Part Name Part code Qty Unit Remark DW-40L348 DW-40L508 DW-40L278 1 DW-40L348 compressor fix board 0270101386 1 EA Designed for 348 2 DW-40L348 feet support 0270101387 1 EA Designed for 348 3 Filter drier 0070701061 1 EA 4 Compressor(NLE12.6CNL) 0274000380 1 EA 5 Gas-R290 140g g 6 Power cable of compressor 0270400152 1 EA 7 Make a mark on the freezer 1 EA 1 DW-40L508compressor fix board Record the new Gas and its Quantity 0270100401 1 EA Designed for 508 2 DW-40L508feet fix board 0270100412 1 EA Designed for 508 3 Filter drier 0070701061 1 EA 4 Compressor(NLE12.6CNL) 0274000380 1 EA 5 Gas R290 145g g 6 Compressor cable 0270400152 1 EA 7 Make a mark on the freezer 1 EA 1 DW-40L278compressor fix board Record the new Gas and its Quantity 0270101748 1 EA Designed for 278 2 DW-40L278 back feet support 0270101786 1 EA Designed for 278 3 Filter drier 0070701061 1 EA 4 Compressor(NLE12.6CNL) 0274000380 1 EA 5 GAS-R290 90g g 6 Liquid and gas separator 0270700135 1 EA 7 Exhaust pipe 0270700090 1 EA 8 Oil return pipe 0270700092 1 EA 9 Make a mark on the freezer 1 EA Pic 1 Record the new Gas and its Quantity DW-40L348/508Before and after compressor replacement 32 / 35
Before replacement Pic 2 After replacement DW-40L278 Compressor Replacement Replace compressor and connect the copper pipe Welding the pipe and check leakage, use insulating tube to cover the suction pipe of the compressor Pic 3 Replace the compressor fix board and install the castors 33 / 35
Remove the back grilling of the freezer,and cut the copper pipe to release the refrigerant; 1) Disconnect the power cable of the compressor; 2) Remove the screws around the compressor and copper pipe; 3) Disconnect the copper pipe and remove the original compressor; 4) Remove the compressor fix board; 5) Place the freezer conversely; 6) Remove the castor and feet, install them to the new board; 7) Install the new compressor and replace the filter drier; 8) Connect the copper pipe around the compressor; 9) Check leakage;(use N2 with 1.5Mpa pressure to check leakage) 10) Vacuum the cooling system(vacuum for 3 hours and pressure is lower than 3pa) 11) Fill the gas(r290) into the cooling system and welding the copper pipe; Quantity of the Gas Item Model Gas Qty 1 DW-40L278 R290 90g 2 DW-40L348 R290 140g 3 DW-40L508 R290 145g 13)Use insulator tube to bind up the copper pipe,especially the suction pipe of the compressor; 14) Make a remark to record the maintenance procedure and details. Cooling system Upgrading of the deep freezer Edit by Ivon @2017.2.16 34 / 35
Inspired living Haier Medical & Laboratory Products Co., Ltd. Room 403D, Brand Building, Haier Industrial Park, No.1 Haier Road Qingdao China Website: www.haiermedical.com 35 / 35