Haier DW-86L628, DW-86W420, DW-86L388 Routine Maintenance, Operation after a power outage

Initial Loading

Warning

Your Haier ULT unit should be cared for by dedicated personnel. Every 2 to 4 hours, the unit's working status should be inspected and recorded on a daily basis. Should there be a malfunction in the unit, the freezer temperature rises. If the problems cannot be corrected in a short time, please remove the stored samples; move them to another unit that meets the temperature requirement to avoid potential damage of property.

Before loading the samples into the unit, make sure to check if the required storage temperature matches the temperature capability of the freezer. This is to avoid any property damage due to insufficient storage temperature for the samples intended to be stored in the freezer.

Because it takes time for refrigeration temperature to reach the stored samples, there is normally a temperature discrepancy between the actual shown temperature and the set point. This is a normal phenomenon. The lower the set point is, the smaller this temperature discrepancy becomes.

Caution

Routine Maintenance

Warning:To prevent electric shock or injury to operators, the AC power supply to the freezer must be disconnected completely before any repair and maintenance work is to be performed. During any repair maintenance work, do not breathe in medical particles or aerosols near the equipment as they might be harmful to your health.

Cleaning the freezer

Clean the unit once a month. This can help the exterior look new.

Use a dry cloth to wipe off loose dust inside and outside of the freezer. If the unit is rather dirty, use a clean cloth soaked with neutral detergent to clean the unit. Then use a dry cloth to wipe off the left over detergent solution. Non-diluted detergent can harm plastic surfaces. Please follow the instructions on how to mix a detergent solution.

Do not pour water directly onto the exterior and interior of the unit. Water can damage the electrical insulation causing malfunction.

Compressors and other mechanical parts are hermetically sealed. They do not need lubrication.

Clean the frost and ice off the unit once a month. Also, clean the condenser filter once a month.

Clean the condenser filter

When the control panel shows an alarm signal for Hot Condenser , the alarm light flashes. The condenser filter must be cleaned to avoid compressor overheating and to improve refrigeration

efficiency. Even if the light is not on, the filter should still be cleaned once a month. To clean the filter, follow the procedure Filter

below.

screen.

All ultra low temperature storage units are low temperature storage equipment. It is prohibited to load an excessive amount of samples into the unit at one time. The compressors run for a long period of time without stopping. The freezer temperature may not decrease, and the compressors can become overheated. Samples must be loaded in batches, and in stepwise decreasing temperature setting. The process should be repeated until the final temperature is reached.

Do not use any unauthorized mechanical means to remove or defrost the unit. Do not damage the refrigeration circuit.

Do not use any non manufacturer-approved electrical components in the freezer.

Operation after a power outage

Your Haier ULT freezer control setting is stored in its memory system. Should there be a power outage and the power recovers, the unit can resume its operation based on the prior set control settings.

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1.Pull off the front grill cover.	Front protection
2.Pull out the filter screen.
	panel for refrigeration
3.Use water to wash the filter screen.	compartment

4.Install the screen back in its original position and close the cover.

5.If the Hot Condenser light is on before cleaning, check the light to make sure the light is off after cleaning.

Defrost the interior

Frost usually forms in the upper portion of the unit and the on the inner doors. Frost and ice can form in between the door gasket and frame to form an air gap. It can decrease the refrigeration effect of the unit. Follow the procedure below to defrost the interior doors using the plastic scraper. The first step is to move the samples to another freezer before the procedure. Do not use any sharp tools such as knife or screw driver to defrost.

1.Remove the samples from the unit that needs to be defrosted. Move them to another unit or a container with a CO2 backup system for temporary storage.

2.Turn off any backup refrigeration system if there is one. 3.Turn off the power supply.

4.Open the outer door and inner doors to let the unit thaw for a period of time. 5.Use a dry cloth to soak up and remove the water on the floor of the unit. 6.After defrosting the unit and cleaning up the water, restart the unit.

7.Load the samples back into the unit after it reaches the set temperature. 8.Turn on the backup refrigeration system if necessary.

Changing battery

The battery that supports the power outage alarm is a consumable item. The life expectancy for the battery is about 3 years. If the battery is more than 3 years old, the battery should be replaced because the alarm function may not work properly , and the stored capacity could also be reduced. To do so, please contact Haier Equipment and Instrument Service center.

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