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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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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℃ (if above 30℃, the refrigeration efficiency would
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.
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℃) for over 24 hours.
3. After the freezer operates for 24 hours stably at initial temperature setting, set the operating
temperature at -135℃ and have the freezer stably operate at this temperature for at least 7 hours.
4. If the freezer works normally at the second temperature setting, set target operating temperature.
5. Normal range of internal temperature: -126℃ to -150℃.
6. Set alarm temperature as required (recommended alarm temperature: operating temperature plus
15℃~25℃).
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
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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-progress 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℃, it is required to open doors and windows, or turn on
the air-conditioning system; while in the case of ambient temperature above 32℃, it is forbidden to use
the freezer, otherwise that may result in compressor burn-out.
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℃. The castors should be leveled and locked; otherwise noise and vibration may occur.
To ensure no noise and vibration during running, please check:
1. Whether the ground of installation location is flat.
2. Whether all the castors are leveled and closely contact with the ground.
Please install 380V/50Hz (3-phase live wire, single-phase null line, single-phase earth wire) or
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.
It is strictly forbidden to connect earth wire and null line; otherwise the freezer may be electrified
and cause personal injury.
To prevent the freezer from being affected by voltage fluctuation, please install a voltage stabilizer,
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:
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.
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.
Turn on the freezer, cool down in the sequence of -126℃, -135℃ and minimum (target) operating
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.
After completing commissioning, the results must be mutually confirmed by commissioning
engineers and the user, and then put on file.
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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℃; continue such a cycle until reaching required temperature, and 12
hours later put the 2nd batch of samples into the freezer.
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.
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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Control board Adjustment
Functions and operating instructions of the SLT freezer control board
● Temperature display
A large display screen indicates actual internal temperature.
A small display screen indicates current input voltage (no voltage indication for 3-phase power). Another
small display screen indicates current ambient temperature.
● Prompt for working state:
“Locked” indicator light “on” indicates all the settings are locked to prevent misoperations.
“Network” indicator light “on” indicates the network system is in working state.
“Running” indicator light “on” indicates the compressor is running.
“Voltage stabilizing” indicator light “on” indicates the voltage stabilizer is boosting voltage.
“Backup system” indicator light “on” indicates the backup system has been connected.
● Alarm indication:
In case of any fault required alarm, alarm is carried out by flashing light alarm signals and audible buzzer
alarm. The former can not be cancelled until the fault clearance, while the latter can be silenced by
pressing the “Cancel buzz” key.
A. “High temperature” indicator light “on” as an alarm indicates internal temperature is higher than the
high-temperature set point.
B. “Low temperature” indicator light “on” as an alarm indicates internal temperature is lower than the
low-temperature set point.
C. “Voltage out of given range” indicator light “on” indicates the voltage is lower or higher than the lower
limit or higher limit of normal voltage range.
D. “Over-high ambient temperature” indicator light “on” indicates ambient temperature is above 30℃.
E. “Sensor fault” indicator light “on” indicates a sensor fault.
F. “Power failure” indicator light “on” indicates the power failure of power circuit.
G. “Dirty condenser” indicator light “on” indicates the condenser is blocked up by dirt and must be cleaned.
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H. “Low battery charge” indicator light “on” indicates the battery is at low charge and must be recharged;
when connected to AC power supply, the SLT freezer charges the battery automatically.
● Key definition:
There are 4 keys on the temperature control board. With the “Locked” indicator light on, all the keys are
locked to prevent misoperations.
●
●
“Function selection”: In unlock mode, press this key to select the desired function from “Internal temperature
setting”, “High-temperature alarm setting” and “Low-temperature alarm setting” and the corresponding indicator
light will be on.
“Cancel buzz”: In lock mode, when an alarm occurs, press this key to silence the buzz for one hour, but the alarm
by flashing light signals is not cancelled.
● The “△” or “▽” key is for the increase or decrease of values.
Starting and temperature setting
The freezer’s control system is provided with functions of password protection and keyboard
locking.
The freezer must be unlocked before use: first press the “△” key, the digits in the internal
temperature display area will flash, and then press the “△” or “▽” key to set the value as “06”, and
finally press and hold the “Function selection” key for 8s to unlock the freezer.
After installation, the freezer must be left still for over 24 hours before being energized.
1. Initial state upon power-on:
Turn on the battery switch at rear upper of compressor compartment, the SLT freezer is energized
and enters into the “power-on” state, and all the parameters are the data before last power failure,
and the display indicates actual temperature. The temperature setting is -126℃ when the freezer
leaves factory.
If actual temperature is higher than temperature setting, delay for one minute, and then the
compressor starts running. Meanwhile, if actual temperature is in the range of alarm temperature,
light signals flash accompanied with audible buzz.
2. Adjustment of set values
2.1 Unlock
2.2 “Function selection”: in unlock mode, press this key to select the desired function from “Internal
temperature setting”, “High-temperature alarm setting” and “Low-temperature alarm setting”.
“Internal temperature setting”: press the “Function selection” key continuously until the “Internal
temperature setting” indicator light is on, at which time the display screen will indicate temperature
setting and the digits flash, and then change temperature setting by pressing “△” or “▽” to increase or
decrease the value, specifically speaking, the value would increase or decrease by 1 if press “△” or “▽”
intermittently, while the value would increase or decrease rapidly and continuously by 1 if press and hold
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“△” or “▽”. After finishing the setting, if no key is pressed in 5s, the temperature value stops flashing,
indicating that the value has been stored in the computer, otherwise the setting is invalid. The range of
temperature setting is -126 ~ -150℃.
In case of ambient temperature above 30℃ (excluding 30℃), if the temperature setting is below -140℃,
please adjust the internal temperature setting to -140℃; in case of ambient temperature below 28℃
(including 28℃), please adjust the internal temperature setting to original set value.
2.3 “High-temperature alarm setting”: press the “Function selection” key continuously until the
“High-temperature alarm setting” indicator light is “on”, at which time the display screen will indicate
temperature setting and the digits flash, and then change temperature setting by pressing “△” or “▽” to
increase or decrease the value, specifically speaking, the value will increase or decrease by 1 if press
“△” or “▽” intermittently, while the value will increase or decrease rapidly and continuously by 1 if
press and hold “△” or “▽”. Once internal temperature is above high-temperature alarm setting, the
alarm of SLT freezer sounds and the “High-temperature alarm” indicator light is on. The
high-temperature alarm setting must not be above maximum temperature limit and ＋5℃ lower than
temperature setting.
2.4 “Low-temperature alarm setting”: press the “Function selection” key continuously until the
“Low-temperature alarm setting” indicator light is “on”, at which time the display screen will indicate
temperature setting and the digits flash, and then change temperature setting by pressing “△” or “▽” to
increase or decrease the value, specifically speaking, the value will increase or decrease by 1 if press
“△” or “▽” intermittently, while the value will increase or decrease rapidly and continuously by 1 if
press and hold “△” or “▽”. Once internal temperature is below low-temperature alarm setting, the
alarm of SLT freezer sounds and the “Low-temperature alarm” indicator light is on. The low-temperature
alarm setting must not be below minimum temperature limit and -5℃ higher than temperature setting,
otherwise the setting can not be performed.
2.5 After finishing all the settings, if no operation is made in 5 minutes, the control board will be locked
automatically, and these settings are valid.
2.6 If any alarm condition occurs, all audible alarms will sound in such a way that it sounds for 15
seconds and then pause for 1 minute until the condition is cleared.
2.7 The setting of operating temperature should be as follows: first set the temperature at -126℃, and 24
hours later, change to -135℃, and 7 hours later, change to required temperature, e.g. -140℃. When the
freezer works normally in successive 3 days at temperature setting value, the 1st batch of samples may be
loaded, but the volume of samples must not exceed 1/5 of the freezer’s effective capacity.
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2.8 If the freezer is required to reach its minimum temperature, e.g. –150℃, please do as follows: make
sure that ambient temperature is below 25℃, and then set the temperature at –145℃ and observe for 5~7
days for stable working state and starting/stopping. If stable, change the temperature to -150℃.
Note: Unless especially required (operating temperature -150℃), it is advisable to set the
operating temperature above –145℃, otherwise that may have a negative influence on both efficiency
and service life of the freezer.
3. Condensate removal:
In case of high ambient humidity, the anti-condensation switch at the rear of compressor compartment
should be turned on to prevent condensate forming at the top opening of cabinet.
4. If the SLT freezer is not to be used for a relatively long time, the battery switch at rear upper of
compressor compartment should be turned off, otherwise the battery charge would be used up, and thus
the battery could not be used any longer and recharged again.
Tips:
For any product may go wrong or fail to work, please follow the instructions below in order to avoid any loss
resulting from faults of the freezer:
1. The freezer must not be installed in a narrow space, and the door of room where it is installed must not be
smaller than the freezer, but at least ensure normal handling to avoid such problems as difficult servicing, failure
to repair it in time and damage of articles stored in the freezer, etc.
2. The freezer should be attended by a qualified person and its operating status must be checked and recorded
every day (check and record once every 2-4 hours). In case of any fault or power failure, the internal
temperature would rise; if the fault may not be cleared in a short time, please take out stored articles and move
them into other devices meeting the temperature requirement of these articles to prevent degeneration or
damage.
3. Before putting articles into the freezer, please make sure their temperature requirement is consistent with the
freezer’s temperature range in order to prevent them from degeneration or damage due to the freezer’s failure to
reach the temperature required by them.
4. Due to refrigeration inertia, it is normal that there is certain difference between the temperature actually
indicated and temperature setting (the lower temperature setting, the smaller temperature difference, whereas the
larger temperature difference).
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Defrosting · Non-use
Defrosting
1. After the SLT freezer is used for some time, a layer of frost may be formed; if too thick, it would
influence the refrigeration effect and increase power consumption. Therefore, the freezer must be
defrosted at certain interval, that is, upon the thickness reaching approximately 10mm.
2. Before defrosting, take out all the articles stored in the freezer and move them into another freezer
for preservation. For defrosting, open the door and place the freezer in a well-ventilated place.
3. After defrosting, remove the resultant water with a soft cloth or sponge, wipe it with a dry cloth, and
then turn it on, and finally load it with articles upon reaching the temperature setting.
4. To speed up defrosting, a flat-bottom container filled with warm water below 50℃ may be put inside
of the cabinet.
Non-use
If the freezer is not to be used for a long time, power supply should be cut off and the freezer should
be cleaned as described in previous sections. Open the door to have internal components dry, and then
store it. The discarded freezer should be far away from fire sources and sent to dedicated place for
disposal.
Warning
Do not defrost with an electric heater, a metal tool or an edged tool.
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Cleaning
Cleaning and maintenance
The freezer should be cleaned after unpacking but before initial startup for commissioning, during
normal use or before non-use.
For safety, be sure to turn off the power switch before cleaning.
The freezer should be cleaned with a soft cloth or sponge moistened with water or soap water
(non-corrosive neutral detergents permitted), and then wiped with a dry cloth to prevent rust.
During use, the dust on compressor compartment condenser, compressor and other pipelines should
be removed with a soft cloth or a banister brush (soft hair brush) to keep optimal refrigeration effect.
When cleaning, be careful not to damage pipelines and circuits.
The condenser should be dusted out at least every 3 months.
Do not clean the freezer with organic solvent, boiling water, detergent powder or acid, etc.
Do not flush the freezer by directly spraying water onto it; do not use a scrub brush (hard hair brush)
or steel wire brush for cleaning.
If the freezer is not to be used for a long time, please turn it off, clean, dry and store it following the
above instructions.
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Q & A
The following phenomena are not faults:
In case of first use or startup, the freezer may work for a long time or give out loud noise, etc. That is
not a fault but normal phenomenon.
It is normal that the condenser fan starts and stops automatically according to ambient temperature.
It is normal that there is fluid flow noise from the freezer arising from the cycle flow of refrigerant in
its pipeline.
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After-sales Service
Analysis on FAQ (frequently asked questions):
If the condenser is dirty or clogged, it could not cool the compressed gas produced by the work of
refrigerant compressor. When it is overheated, the compressor may be damaged. Therefore, the
condenser must be cleaned on a regular basis to keep clean.
If the freezer is installed close to a wall, it may lead to bad ventilation. In this case, once ambient
temperature reaches 32℃, the condenser temperature would rise rapidly, seriously affecting the
refrigeration system. Therefore, such measures must be taken as reinstallation, ventilation improvement
or installation of air-conditioning system to ensure that ambient temperature is kept below 27℃
(especially in hot summer or tropical zone).
Unstable voltage or under-voltage may result in abnormal running of compressor. The rated voltage
of compressor is 380V±10% (or 220V±10%), beyond which it is recommended to install a voltage
stabilizer.
If the freezer is installed in a closed room with air-conditioning system, it may be damaged due to a
steep rise of ambient temperature in case of air-conditioner failure, especially on festivals and holidays
or at night, so a monitoring system should be installed.
Emergency measures
In case of any fault or any other emergency,
1. immediately move the samples stored in the freezer into a safe freezer in the vicinity.
2. turn off power switch.
3. contact and report the fault to local Haier After-Sales Service Center to have it clear soon.
Common troubles and solutions
The freezer does not work
At first, check whether the air switch is tripped and whether power failure of external power
network occurs, if the fault is not caused by the two reasons, check whether the AC contactor coil of
compressor control board is energized; if energized, there is nothing wrong with the control board, and
then check the circuit to compressor or compressor condition; if not, there is something wrong with the
control board.
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Solutions: If the problem lies in control board, replace it; if lies in compressor itself, replace it or its
accessories.
Unstable temperature
Internal temperature does not reduce, but rises, e.g. rises to -80℃ from -140℃.
Cause 1: Dirty condenser or clogged air vent
Solution: Clean the condenser
Cause 2: Slowdown of fan speed
Solution: Replace the fan
Cause 3: The freezer is extremely close to a wall
Solution: Move it far away from the wall for good ventilation
Cause 4: The freezer is placed in a closed narrow space
Solution: Install an air-conditioning system and improve ventilation condition
Cause 5: The freezer is not left still for a sufficient time and is energized before its system reaches
stable state, resulting in the problem of “oil beating” taken place in the compressor.
Solution: Turn off the freezer, leave it still over 24 hours, and then turn it on, gradually reduce the
temperature setting from -126℃ by following corresponding operating instructions.
Cause 6: The samples loaded at a time are over 1/5 of the freezer’s effective capacity, or the
samples loaded are too hot (20℃ higher than the temperature setting, e.g. the samples temperature
is -106℃ or above and the temperature setting is -126℃). In this case, the load of freezer greatly
increases, so the compressor works for a prolonged time, and thus causes the temperature rise of
compressor, steep reduction of refrigeration effect as well as imbalance between the cold energy
provided by the refrigeration system and the loss of cold energy for the entry of ambient air, finally
resulting in the rise of internal temperature.
In this case, it is the fault of user for he/she uses the freezer as a quick freezer. However, the
appliance is a SLT freezer for maintaining the low temperature of articles with only a little
refrigeration and requires all the articles to be cooled down to basically equal temperature before
being put into it. If the user fails to follow instructions described in this manual, the continuous
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running of compressor may be likely to cause compressor burn-out.
Solution: Immediately have the compressor stop running; one hour later, i.e. after the compressor is
moderately cooled down, adjust the temperature setting to a higher level to ensure that the
compressor may stop running in 50 minutes; have the freezer operate at this temperature for 6~8
hours, and then decrease the temperature by -10℃; have the freezer operate at this temperature for 8
hours, and then decrease the temperature by -5~-10℃; in a word, decrease the temperature setting
step by step until reaching the required temperature.
Serious compressor noise
Cause 1: It is normal that the noise level is higher than that of general home appliances and
ultra-low temperature (ULT) freezers.
Check: It is normal only if the system noise is not higher than 75dB.
Solution: Do not use it in offices or laboratories where people stay for long.
Cause 2: Fan motor
Check: Check whether the noise is from compressor or fan motor.
The noise from compressor is for the fan motor’s efficiency reduces and fails to cool the
compressor effectively.
Solution: Replace the fan motor
Cause 3: The compressor pressure increases due to dirty or clogged condenser lowering
refrigeration effect.
Solution: Clean the condenser, and replace the compressor if necessary (serious damage).
Cause 4: Over-high room temperature
Over-high ambient temperature causes steep drop of refrigeration effect.
Solution: Adjust room temperature and check noise level. Over-high noise level indicates serious
compressor damage, in which case the compressor must be replaced.
In case of any fault, be sure to immediately move the samples stored in the freezer into a proper device
for safe preservation, and then turn off the freezer and contact Haier Headquarters or local After-sales
Service Center to receive timely and fast service.
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Telephone number of Haier Headquarters: 86-532-88937236、88936023
Warranty
This series of products are under warranty in one year calculated from the date of purchase (subject
to the invoice date; but calculated from the date on the “Installation and Commissioning Sheet” for those
products purchased from dealers).
As for the products out of warranty period, they will be charged as per Haier Uniform Service
Charge Standard. For the replacement of parts, only cost and freight are charged and no charge on
service is required to pay.
The freezer enjoys Haier star-level service. If there is any problem, Haier will provide door-to-door
service in 24 hours. Due to the particularity of both super low temperature (SLT) products and articles
stored, the servicing and commissioning period is normally 15 days. For better use, we strongly
recommend users to purchase a backup freezer or relevant backup systems in order to prevent influences
on the normal storage of samples during servicing or in emergencies.
The space below for pasting the invoice or Installation and Commissioning Sheet
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Technical Parameter
Model
Overall
(W×D×H)
Internal
(W×D×H)
Compressor
dimensions 1570×850×1060
dimensions 667×462×650
3.5HP
DW-150W200
Effective volume 200L
Min.
-150℃
temperature
Operating
temperature
range
-126~-150℃
Rated current
2-phase 19A, 3-phase
11A
Rated voltage
380V/50Hz
220V/50Hz
or Weight
315kg
Temperature decreasing curve reference
DW-150W-200 curve [it is required to check the temperature decrease time (not including pre-cooling delay
time) according to the ex-factory inspection requirements]
20-24
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Packing List
Qty.
Description
Warranty Card
1
Operation Manual Frost scraper
Plastic bag
1
Model
DW-150W200
1
1
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Schematic Circuit Diagram
22-24
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Schematic Refrigeration Diagram
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Ambient Conditions
The freezer is designed in consideration of following conditions and can be used in a safe way at least
under the following conditions (on the basis of IEC 1010-1):
1. Indoor use;
2. Altitude not higher than 2000m;
3. Ambient temperature within the range of 5℃～32℃;
4. At a temperature not above 31℃, maximum relative humidity is 80%; the max. relative humidity
decreases in a linear manner as temperature rises; max. relative humidity decreases to 50% upon
reaching 40℃;
5. The voltage fluctuation of main power supply is not over ±10% of its rated voltage;
6. Additional fluctuation range of power supply voltage specified by the manufacturer;
7. Up to the transient voltage of Equipment Installation Category (Over-voltage Category) II; for main
power supply, the minimum and general category is Category II;
8. Up to Pollution Class II specified in the Standard IEC664.
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