Troubleshooting Guide

Should there be any malfunctions in the system, please attempt to answer the following questions before notifying maintenance or calling Haier Equipment & Instrument Service Center

Freezer does not start up.

Is the power supply normal? Has the main power switch been turned on yet?

Is the voltage supply too low?

Is a larger amount of load placed into the unit at one time?

Freezer's refrigeration ability is reduced.

Is the environment temperature too high?

Are the inner doors and outer door closed properly? Does any ice and frost damage the seal between the door and the frame?

Is the condenser filter clogged?

Is the temperature setting correct?

Is the freezer far away from any direct sunshine?

Is the freezer near any heat source?

Is the porthole plug installed in the porthole with proper insulation materials?

Has the freezer been loaded with too many non-frozen samples within the last few hours? If so, the problem is temporary. You can set the temperature to a higher value to let the freezer cycle at temperature then gradually lower the set point temperature until it reaches the desired temperature.

The unit is noisy.

Is the unit set on a firm floor?

Does the exterior of the unit touch any objects?

Is the freezer unit leveled with the leveling legs?

Does the freezer operate in a low temperature zone? If the load is heavy, and the cabinet temperature is warm, the unit may emit noise. The noise level would decrease as the cabinet temperature gets colder.

Is the noise emitted from the compressors? ULT compressor noise tends to be higher than that of a household refrigerator unit.

The noise might be a crackling sound. This is probably the result of contraction of internal mechanical parts due to rapid cooling inside the equipment. Stepwise pulldown in temperature with slower temperature change can reduce this noise.

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Initial Loading

Installation

1.Remove all packing materials and straps. 2.Adjust support legs

Rotate the leveling legs clockwise to extend them out to anchor to the floor to ensure the unit does not move while in usage.

Leveling

Levelingleg leg

3.Grounding

Warning A socket with proper grounding must be used for the equipment. If the socket is not grounded, an upgrade of the power socket to include grounding must be done by a qualified technician. Do not use gas lines, water mains, telephone lines or lightening rods as the grounding device as they can lead to electric shock. After the unit's power cord is plugged into the power socket, the plug must be easily accessed. This allows a quick disconnect of the unit from the power supply in case of an emergency. The condenser inlet must not be blocked at anytime.

Test and adjustment

When the unit is started the first time, please follow the procedures below.

1.Leave the unit standing in its intended location for at least 24 hours before switching the power on.

2.While keeping the unit empty, plug in the power cord to a dedicated power socket that meets all requirements.

3.Please turn on the power switch for the rechargeable battery located on the control box in the back the unit. This control box is visible from the back of the unit. If this switch is in the "OFF" position, there will be a low battery alarm during functional test.

4.If the unit has a backup cooling system, turn off the backup system. 5.If the alarm buzzer sounds, press the cancel button to silent the alarm.

6.Set the unit to desired temperature:Do not load the unit with any samples. Power up the unit to let it run down to -60 . Let it run at -60 for 8 hours then lower it to - 80 . Observe the unit performance for 24 hours for normal cycling to ensure it is working properly.

7.Once the unit is confirmed to operate properly, it is ready to be loaded with samples. In principle, the freezer unit should be set at about 3 above the desired set point. For example, if the storage temperature is -60 , set the unit at -57 . Load the unit to 1/3 of the unit's capacity. Make the unit is capable of cycling for more than 8 hours.

8.If the unit has a backup cooling system, turn on its control.

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Haier DW-86L386, DW-86L628, DW-86W420, DW-86L388, DW-86L626, DW-86L288 Troubleshooting Guide, Initial Loading, Installation
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DW-86L386, DW-86L288, DW-86L626, DW-86L388, DW-86W420 specifications

Haier's line of biomedical freezers, including the DW-86L628, DW-86W420, DW-86L388, DW-86L626, and DW-86L386, showcases the company's commitment to innovation, reliability, and advanced technology in preserving sensitive biological materials. These models are designed to meet the needs of laboratories, hospitals, and research institutions, providing optimal storage solutions for a variety of critical applications.

The DW-86L628 is recognized for its impressive capacity of 628 liters, making it ideal for facilities that require large storage volumes. It features a temperature range of -10°C to -86°C, ensuring that vaccines, biological samples, and pharmaceuticals are stored under precise conditions. With a powerful refrigeration system and an efficient insulation design, this model ensures rapid cooling and maintains consistent temperatures.

The DW-86W420, on the other hand, balances capacity with energy efficiency. This model offers a slightly smaller design, suitable for environments where space is at a premium. It includes a user-friendly digital display that allows for easy monitoring of temperature and system performance, while also providing real-time alerts for any deviations outside of the set parameters. Additionally, it is equipped with a patented eco-friendly refrigerant, reducing the environmental impact while maintaining high performance.

In the DW-86L388, Haier emphasizes robust safety features. This freezer is engineered with a dual-lock system to prevent unauthorized access, alongside an advanced alarm system that notifies users in the event of power failures or temperature fluctuations. This level of security is crucial for laboratories that manage valuable specimens.

The DW-86L626 is tailored for versatility and comes with adjustable shelving and organization options, allowing users to configure the interior to suit their storage needs. Its peak temperature recovery time is remarkably quick, ensuring that samples remain secure even after door openings.

Finally, the DW-86L386 combines compact design with advanced technology. It is aimed at users with limited space, yet it does not compromise on storage efficiency. The unit is equipped with energy-saving modes, reducing operational costs while ensuring optimal performance.

In summary, Haier's DW-86 biomedical freezer models stand out for their high performance, reliability, and thoughtful design tailored for the rigorous demands of biomedical storage. With an emphasis on safety, energy efficiency, and user-friendly features, these freezers are a smart choice for any facility focused on preserving vital biological materials.
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