HAIER DW-40L348 (01) PDF MANUAL

HAIER DW-40L348 (01) PDF SUMMARY:

What models does this service manual apply to?

This service manual is effective for the DW-40L278, DW-40L348, and DW-40L508 deep freezer models.

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What are the specifications of the deep freezers?

Specification	DW-40L278	DW-40L348	DW-40L508
External dimensions (mm)	736x660x1810	750x840x1860	895x840x1860
Internal dimensions (mm)	520x435x1230	535x607x1228	685x650x1228
Effective volume	278L	348L	490L
Door	Foaming door
Foam material	Hard polyurethane
Compressor	Totally enclosed
Drawer	6	12	10
Refrigeration	Direct cooling
Outer/inner plate	Spraying steel/HIPS
Condenser/evaporator	Wire tube/plate
Temperature controller	Computer control
Refrigerant	R404a 215g	R404a 195g	R404a 245g
Weight	115kg	137kg	164kg
Temperature range	-20°C ~ -40°C	-20°C ~ -40°C	-20°C ~ -40°C
Rated power supply	220-240V/50Hz/60Hz	220-240V/50Hz	220-240V/50Hz
Rated power/current	310W/3.1A	360W/2.9A	430W/2.91A
Noise level	44dB(A)	45dB(A)	45dB(A)
Foaming agent	CP/IP	CP/IP	CP/IP
Climate type	4	4	4
Electrical protection	I	I	I
Power supply connection	Y	Y	Y
Testing hole	1	1	1
Alarm	Yes
Power outage alarm	4-18 hours
Rechargeable battery	DC 12V

Climate type 4 means the temperature is +30°C, and the relative humidity is 55%.

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What are the regulations for type naming?

The rated volume can be the gross volume or effective volume, as decided by the manufacturer. The effective volume value must be marked on the nameplate whether effective volume or gross volume is marked in the product name.

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What does “DW-40L348” mean?

DW-40L348 indicates a deep temperature storage refrigerator with a characteristic temperature of -40℃, horizontal orientation, and a rated effective volume of 348L.

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What are the safety precautions to take note of?

1. The machine uses AC 220-240V/50/60Hz power. If the voltage used is 10% higher or lower than the rated voltage, an auto stabilizer above 4000W should be equipped. Power lines that require lengthening should have a cross section no less than 1.5mm.
2. An independent private jack should be used and reliably connected. The power line for the refrigerator is equipped with a 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 should be touchable after installation. Power lines or plugs with abrasion should not be used. Abraded or damaged power lines should be sent to the 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. Flammable sprays should not be used close to the freezer to avoid fire.
5. In the event of inflammable gas such as coal gas leakage:
   • Shut the valve for leakage.
   • Open the door and window for ventilation.
   • Do not pull out or insert the power plug of the freezer.
6. Prevent children from playing in the freezer to avoid accidents.
7. Once the power of the freezer is cut, it should be re-connected at least five minutes later to avoid damage to the compressor or the system. The power should be cut for maintenance. Do not roll or damage the power line.
8. Protective equipment should be worn when accessing the freezer to avoid freezing injury. When the freezer is scrapped, remove the doorman. The scrapped freezer should be kept away from fire and sent to an appointed site for disposition.

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What are the components and function modules of the deep freezer?

1. Temperature control: It is controlled by a microcomputer with a digital display for temperature, while the inner temperature can be adjusted from -20℃ to -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).
   • Two alarming methods: sound buzzing alarming and 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 a 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.

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What should be paid attention to during the replacement of parts?

• The rivet nut should not be pulled too tightly.
• Omitting or lacking PS spacers.
• Forgetting spring washer.

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What are the self-checking items after replacement?

• Whether the rivet nut is tight.
• Whether two PS spacers are used.
• Whether a spring washer is used.

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How to disassemble the control board?

Unscrew the screws on the top side to fetch the control board. Note that there are wires connecting the control panel and the refrigerator. Installation should be the reverse of the disassembly steps.

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What are the basic parameters of the computer board?

• Rated frequency: 50/60Hz
• Rated voltage: 220 -240 A.C
• Control current for press under normal operation should 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.

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What is the temperature display range?

The display range is from +50℃ to -60℃. Temperatures higher than +50℃ display as “50”, and temperatures lower than -60℃ display as “-60”.

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How does the overheat alarming function work?

When the actual temperature sensed by the sensor is higher or lower than the set temperature by +5℃, the overheat alarming light will flicker (with an interval of 1S), accompanied by buzzing (with an interval of 0.5S). Pressing the buzzing releasing button will release the buzzing, but the red light will keep flickering. Pressing the button again will not recover the buzzing. The buzzing releasing button can only reset to recover the buzzing function when the temperature is within +5℃ above or below the set temperature, or when the power is cut. If the freezing sensor is in error, the red light may keep flickering with an interval of 1S and the alarming will fail.

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What happens when the freezing sensor is in error?

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 the compressor alternates between 20min on and 5min off, with alarming in failure. If the refrigerator is in quick-freeze status, it will quit (the corresponding light will be off).

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What is the break down memory function?

When the frozen food cabinet is broken down and electrified again, the memory function can operate according to the status set before breaking down. The display control order is quick freeze, then normal control, F1 display, and finally temperature display.

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How to operate the control system (DW-40L508)?

1. Unlock: Press the " " button for at least 5 seconds. The display panel will show “F0”, bit “0” flash, then press the " " button, the display panel show “F1”. Then press the " " button, all the keys are unlocked, then the display panel will show the actual temperature of the cabin. If there is no operation for 10 seconds, the keys will be locked.
2. Temperature setting: At the Unlocked status, press the " " button, the display panel will show “L0”, Bit “0” flash, press the " " button again, it will show the set value, the second bit of the set value will flash. Press the " " button to change the bit, then press the " " button to change the value to -40 degrees, or another value you need.
3. Temperature Calibration: At unlocked status, press the " " button and " " button at the same time for at least 5s, the display will show the value of calibrate. For example, if the display value is -40℃ and the real temperature is -35℃, input +5℃, then the LED will show -35℃. The range of calibration is -5 to +5℃.

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How does the press (compressor) turn on and off?

When the inner temperature reaches the set temperature, the sensor measures the temperature and converts it into an electrical signal, which is sent to the control chip of the computer board. According to a pre-set procedure, the chip sends a stop order to the compressor to shut it down. When the inner temperature returns 1℃ higher than the set temperature, the chip sends out a stop order via the same procedure to shut the compressor down. If the temperature return in the freezer is too fast (less than 5 minutes), then it is taken as 5 minutes.

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How does the fan turn on and off?

The fan operates synchronously with the compressor.

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What should be done if the press (compressor) cannot start?

1. The fuse is burned out: Change the fuse.
2. Connecting parts of cabinet are damaged: Change the socket connector.
3. The connecting line for the electric cabinet is not in the right position: Install correctly after inspection.
4. The temperature controller is in error: Adjust parameters. If the temperature controller is damaged, change it.
5. The starter or thermal protector is damaged: Change the starter or thermal protector.
6. The press (compressor) is in error: Change the press.

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What should be done if there is a high temperature inside the freezer?

1. The set temperature is high: Reset
2. The freezing agent is leaking: Find the leaking point and weld. Refill freezing agent.
3. The temperature controller is damaged: Change the temperature controller.
4. The capillary or system is dirty and stopped: Clean the capillary or change the filter.

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What should be done if the screen doesn’t display temperature and displays E6?

1. The temperature-sensing probe is in a short or open circuit: Inspect the temperature sensing probe.
2. Without a temperature sensing probe: Install a temperature sensing probe.

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What should be done if there is a big noise?

1. The freezer is not even: Change the position of the freezer.
2. Sympathetic vibration between pipelines or freezers when the press is operating: Clear up the pipelines to avoid sympathetic vibration.
3. The fan and fan bracket are loose: Re-fix.
4. Connection bolts of the press are loosened: Tighten the inner connecting bolts.

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What are some frequently asked questions and answers?

Question	Answer	Measures Able to Adopt
Inner temperature is too high or too low.	Can be resolved by adjusting and controlling the temperature.	See detailed operation in the instruction manual.
Sides of the freezer are hot. There is anticoagulant near the freezer open on the side surface.	Heating is normal instead of an error.	Can turn off the electric heating switch.
There is a difference between the displayed temperature and the detected temperature.	The displayed temperature is the temperature on the sensing probe. It is normal to have a difference with that of the freezer.	Normal situation needs no resolution.
The alarming rings in a short time after start up.	Alarm when the inner temperature is within the alarming region.	Normal situation needs no resolution.
Why is there serious frosting in DW-40L508 series?	It may be caused by a loose door or frequent opening of the door, or one of the small holes allowing the condenser to enter the freezer is not plugged up.	This needs to be disposed of by service persons. Moreover, regular defrosting is required to keep a better effect, normally once per 1-2 months.
Error of DW-40L508 series sensors and how does the press operate?	During the operation of the 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 the 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 the DW-40L508 series machine?	The set range is -20～-40℃.

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What are the cooling unit parts?

Part description	Parameter	Models
compressor	Secop/Danfoss SC21CL power 220-240V/50Hz Start capacitance 117-7040（80uF）	DW-40L508/348
compressor	Secop/Danfoss SC18CLX.2 power 208-230V/60Hz Start capacitance 117-7066（80uF）	DW-40L508
compressor	Secop/Danfoss SC12CLX.2 power 220-240V/50Hz/60Hz Start capacitance 117U5019（80uF）	DW-40L278
Refrigerant	R404a	DW-40L508/348/278
Fan motor	EBM AC230V/50/60Hz	DW-40L508/348/278
Display panel	0071800050C，Haier PCB	DW-40L508/348/278
control panel	0071800049C，Haier PCB	DW-40L508/348/278

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What is an example of a product nameplate?

The nameplate includes the model number, refrigerant type and amount, inner temperature range, anti-shock safety classification, effective volume, power connection type, rated voltage and frequency, foaming cabinet type, manufacture date and number (in barcode), power input, rate current, climate class, and weight.

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What are the fault codes?

• 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“

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What are the refrigerant details?

Type	DW-40L278	DW-40L348	DW-40L508
Refrigerant	R404a 215g	R404a 196g	R404a 245g

Note: The refrigerant type and weight on the nameplate shall not be misused.

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What are some troubleshooting steps for when the compressor fails to start?

Fault	Analysis	Maintenance Measures
Compressor fails to start	Machine storehouse wiring connector plugs are damaged	Change the connector plugs
	Bas wire contact	Check contact and make in good condition.
	Display panel connection failure	Checking if it is due to bad connection, otherwise, change it.
	Relay, start capacitor or heat protector is damaged	Change the part.
	Compressor fault	Change the compressor
	User’s voltage is too low	Add a manostat
Fan does not rotate	Fan wiring is loose	Checking the wiring
	Fan blades are blocked by foreign matters	Checking and clean them
	Fan is damaged	Change parts
High temperature in the cabinet	The temperature setting of outage is too high.	Re-set computer board
	Refrigerant leaks.	Find leak location and make repair welding. Infuse refrigerant again.
	Temperature probe is damaged	Change parts
	Capillary tube or system is blocked by dirt\ greasy	Clean the capillary tube or change filter.
	High ambient temperature	Turn on air-conditioner，reduce ambient temperature.
	Condenser blockage	Clean condenser
Display board displays E6	Temperature probe short circuit or disconnect	Checking the temperature probe
	No temperature probe	Install a temperature probe

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What to check when there is poor cooling?

Condition	Check
High-temperature stage fan is normal	Check the fan and the control circuit
Low-temperature stage fan is normal	Check the fan and the control circuit
Freezer temperature ≥ high-temperature alarm set temperature	Check the compressor and control circuit
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 compressor and control circuit
Low-temperature stage compressor is normal	Check whether there is a refrigerant leakage, repair leakage
High-temperature stage compressor is normal

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What are the spare parts for the DW-40L278?

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
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

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What are the spare parts for the DW-40L348?

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
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

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What are the spare parts for the DW-40L508?

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