DW-150W200
Super Low Temperature (SLT) Freezer
（DW-150W200）
Operation Manual
Contents
Before Use
Product Features-----------------------------------2
Parts Name -----------------------------------3
Safety Precautions----------------------------------4
Installation Location-------------------------------6
In Use
Preparations and Operation Procedures------7
Control Board Adjustment---------------------9
Maintenance & Servicing
Defrosting · Non-use-----------------------------12
Cleaning--------------------------------------------13
Q & A-----------------------------------------------14
After-sales Service------------------------------- 15
Technical Parameter
Schematic Circuit Diagram------------------ 18
Please read this manual carefully before using the freezer.
Please keep this manual in a safe place for future reference.
The freezer is designed for preserving various articles at low temperature for such departments as
clinic, medicine, scientific research and quarantine, etc.
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Product Features
● Relying on unique cascade refrigeration system and its stable/reliable running, the freezer
achieves better refrigeration effect and may be used in a wider range of ambient temperature
compared with counterparts, greatly reducing maintenance cost.
● The freezer is featured with computer control, digital temperature display and adjustable
internal temperature in the range of -126
℃~-150℃. The password protection function ensures
no unauthorized modification on parameter settings.
● The freezer is set with test holes to facilitate the experimental use.
● With rapid cooling speed due to super-powerful refrigeration design,, the freezer may cool
samples stored in it down to required temperature in a shorter time, ensuring samples safety;
super-fast refrigeration may also ensure much faster temperature recovery after door opening
to prevent samples from accidental damage or necrosis. This advantage is especially important
for those users preserving stem cells.
● Even internal temperature allows 100% space to be used efficiently.
● Designed with self-locking castors, the heavy-duty freezer may be moved easily.
● The freezer is provided with functions of network monitoring, remote alarm and automatic
low-voltage compensation; in addition, functions of alarm and control via mobile phone short
messages for your option.
We hereby make an apology to you for incomplete consistency between the product you received and that
shown in the picture of manual due to product improvement.
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Parts Name
Door closure Control board
Compressor
compartment
Cabinet Front cover of compressor compartment
Notice
Dear Haier’s customers,
Thank you for choosing and using Haier products!
Haier is dedicated to providing high-grade, high-precision and advanced
products, and thus it may say that Haier products are featured with good quality
and high performance. For your better use, please read this manual carefully before
use and follow the operation procedures as described in this manual.
Our “international star-level service” will accompany with you all the time. Any
problem in use, please contact us via the telephone number and address given on the
warranty card. We are willing to serve you at any time.
Thank you again for choosing Haier products and recommending them to other
people!
Haier – sincere forever!
Note: The product is suitable for applications in special laboratories. Please see actual product for its
appearance, color or pattern.
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Safety Precautions
Please read all the installation and operation instructions carefully, and strictly follow them when
installing and operating, otherwise the user shall be solely liable for any resultant damages (including
part damage).
Precautions for installation location
1. Installation site of the equipment should ensure a well-ventilated circumstance, avoid direct
sunlight.
2. The freezer must not be installed close to heat sources and no heater is permitted to close it.
3. The freezer must not be installed in an enclosed or narrow space.
4. The room temperature should be kept below 25
lower rapidly and the compressor would be damaged easily).
5. To be installed, the freezer should be kept at least 30cm away from any wall.
6. The site where the freezer is used must be provided with a special air switch with leakage protector of
proper specification (3-phase 16A, single-phase 25A); the wiring must be in the form of crimp
connection and any socket/plug is strictly forbidden to use for connection.
7. In case of frequent occurrence of unstable voltage or below rated voltage, a voltage stabilizer should
be installed.
℃ (if above 30℃, the refrigeration efficiency would
Precautions for operation
1. After its installation or handling, the freezer must be left still at least 24 hours before being energized.
2. The freezer must operate at initial temperature setting (-126
3. After the freezer operates for 24 hours stably at initial temperature setting, set the operating
temperature at -135
4. If the freezer works normally at the second temperature setting, set target operating temperature.
5. Normal range of internal temperature: -126
6. Set alarm temperature as required (recommended alarm temperature: operating temperature plus
℃~25℃).
15
Both refrigerant and foaming agent used by the freezer are flammable and explosive substances.
Therefore, be sure that the site where the freezer is used is well ventilated and fire fighting equipment is
provided near the installation location.
Do not put too many or too hot samples into the freezer at a time, otherwise result in the increase of
system load, prolonged running of the freezer and further burn-out of compressor. It is advisable to put
℃ and have the freezer stably operate at this temperature for at least 7 hours.
℃ to -150℃.
℃) for over 24 hours.
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samples into the freezer in batches and pre-cool those hot samples fully before putting them into the
freezer.
In case of handling or moving, only after the freezer is left still for over 24 hours can it be energized
to operate, otherwise result in serious damage to the freezer, even compressor burn-out.
For any equipment may go wrong or fail to work, the user must ensure that reserve equipment or
reserve devices are available in the vicinity so that samples can be moved into safe reserve equipment or
system for preservation in an emergency.
It is required to have special equipment in-p rogress checked (at least 2 hours/time) by a full-time
technician so that protective measures would be taken immediately in case of any fault. The
manufacturer shall not be liable for compensation for any loss incurred by samples damage resulting
from the user’s failure to find a fault and move stored samples into reserve equipment in time.
In the case of ambient temperature above 27
the air-conditioning system; while in the case of ambient temperature above 32
the freezer, otherwise that may result in compressor burn-out.
℃, it is required to open doors and windows, or turn on
℃, it is forbidden to use
Warning
1. Do not load the freezer with samples over 1/5 of its capacity at a time.
2. Do not put large-volume liquid samples or hot articles into the freezer.
3. Do not leave the door open for over 1 minute.
4. Note: The freezer is not for quick freezing and production, but for super low temperature (SLT)
reservation. Therefore, it must not be forcibly used for the quick freezing of a large amount of hotter
(relative to -140 ) samples
℃ .
Exclusions:
Equipment failure or samples damage resulting from the user’s failure to follow the above-mentioned
operation instructions is not covered by the scope of warranty and compensation.
Equipment failure or samples damage resulting from such reasons as artificial destroy and
misoperation of the user, etc. is not covered by the scope of warranty and compensation.
Equipment failure or samples damage not resulting from the manufacturer’s fault, but from fire
hazard, war and earthquake, etc. is not covered by the scope of warranty and compensation.
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Installation Location
1. The freezer must be installed in a well-ventilated place where the room temperature is below 27°C.
2. The freezer must not be placed in the site that under direct sunlight or close to heat sources.
3. The temperature of equipment working environment should not be less than 10 ° C.
The freezer should not be used if ambient temperature below 10°C.
4. If ambient temperature is controlled by an air-conditioner, be sure to keep the air-conditioner working
around the clock (24h).
For good ventilation, the freezer should be at least 30cm away from a wall or other objects; otherwise the
heat produced by its compressor may not be dispersed in time, resulting in the reduction of condenser’s
cooling effect, even compressor burn-out in case of overload.
5. The supply voltage should be within the range of 380V±50Hz 10% (or 220V±50Hz 10%). In case of
frequent occurrence of unstable voltage, a voltage stabilizer (7.5 kW or above) must be installed.
6. The freezer should not be installed in a humid place or a place to which water is easily splashed. The
splashed water and dirt on the freezer should be wiped off with a soft cloth. It is recommended to use
fire prevention system or dehumidification system.
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Preparations and Operation Procedures
When handling, it is strictly forbidden to overturn (upside down) the freezer; never allow its angle of
inclination over 45° to avoid oil spill onto the system pipeline.
Note: If the freezer is excessively inclined or upside down, compressor oil would spill onto the
system pipeline, resulting in inadequate compressor oil. Further, inadequate compressor oil leads to
insufficient lubrication, which results in noise from compressor, even agglutination of piston and
cylinder inner wall, damage to compressor motor.
Preparations before use
When unpacking, all the packing materials (including base) should be removed.
All the packing materials removed should be kept in a safe place and not thrown away before
completing the commissioning. Only when the freezer is accepted after commissioning can you throw
them away or destroy them to avoid inconvenience in commissioning or fault handling.
Unpack the freezer with even force to prevent damage to the freezer or personal injury.
After unpacking, first clean the freezer as described in the Section “Care and Maintenance”.
The freezer should be installed horizontally in a well-ventilated place where the room temperature is
below 27
1. Whether the ground of installation location is flat.
2. Whether all the castors are leveled and closely contact with the ground.
220V/50Hz (single-phase live wire/null line/earth wire) power supply strictly following the requirements
specified in the product’s label, and have qualified installation personnel carry out wiring. Note: the
capacity of distribution system must be higher than the rated capacity of freezer and the freezer must be
reliably grounded.
and cause personal injury.
the capacity of which should be higher than the rated capacity of freezer.
Commissioning
After finishing installation, be sure to leave the freezer still for over 24 hours before turning it on in
order to ensure complete oil return.
If the freezer is moved, only after leaving it still for 24 hours can perform any operation.
In case of handling, if the freezer is energized before reaching stable state, the following problems may
occur:
Before turning on the freezer, check the power supply for input voltage/power 380V/50Hz or
220V/50Hz with a test pencil or a voltmeter, and check the earth wire for reliable grounding.
temperature as described in the Section “Temperature Setting”, and the commissioning is completed
once it works normally at minimum operating temperature. It is required to record the time of
commissioning and corresponding temperature in details in the process of test.
engineers and the user, and then put on file.
℃. The castors should be leveled and locked; otherwise noise and vibration may occur.
To ensure no noise and vibration during running, please check:
Please install 380V/50Hz (3-phase live wire, single-phase null line, single-phase earth wire) or
It is strictly forbidden to connect earth wire and null line; otherwise the freezer may be electrified
To prevent the freezer from being affected by voltage fluctuation, please install a voltage stabilizer,
1. It causes the symptom of compressor being lack of oil, resulting in noise produced by metal
friction or knock;
2. It causes the symptom of agglutination between piston and cylinder inner wall, resulting in
damage to compressor.
Turn on the freezer, cool down in the sequence of -126 ,
After completing commissioning, the results must be mutually confirmed by commissioning
℃ -135 and minimum (target) operating ℃
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Samples storage and instructions
Only after the freezer operates stably after commissioning and making sure that internal
temperature meets storage requirements can samples be put into the freezer in batches.
The freezer must not be loaded with samples over 1/5 of its effective capacity at a time. If samples
are too hot, they should be pre-cooled down to required temperature by other equipment before being put
into the freezer. After loading the freezer with samples, set internal temperature 5℃ higher than the
temperature of samples, keep it running until 8 hours after normal starting/stopping, and then decrease
the temperature setting by -5~-10
nd
hours later put the 2
The freezer is not used for quick freezing, but for storage and preservation. Therefore, do not try to
freeze relatively hot samples, or that may result in damage to samples and the freezer. What’s worse, that
may result in destroy of samples and compressor burn-out. Furthermore, it is advisable to put fewer
samples into the freezer at a time.
Note:
1. Do not put all the samples into the freezer at a time, but put 1/5 each time at an interval of
24 hours.
2. Be sure to wear special gloves in handling samples to avoid frostbite.
batch of samples into the freezer.
℃; continue such a cycle until reaching required temperature, and 12
Preparations required by safe samples storage
For safe samples storage, the following preparations must be made to deal with emergencies such as
power supply failure and equipment damage:
1. Install a backup LN (liquid nitrogen) system.
2. Provide a LN tank (can be preserved for 3~4 hours).
Safe samples storage
1. In an emergency, immediately move the samples stored in the freezer to a safe place and keep them
well. The manufacturer shall not be liable for any sample damage resulting from the user’s failure to
follow the instructions at any time.
2. Ensure that a standby super low temperature freezer or LN tank is available in the vicinity for
emergencies. The possible emergencies include equipment damage or fault due to its defects, or
equipment damage for external factors such as fire hazard, power failure, etc.
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