SO-LOW MV Series User manual

To reduce the risk of fire, electric shock or injury to persons using this freezer, read all instructions and follow
basic safety precautions before using the unit, including the following:
Do not modify the plug provided with the unit. If it will not fit the outlet,
have a proper outlet installed by a qualified electrician.
Do not position equipment so it is difficult to disconnect from the power supply.
While under warranty, do not attempt to repair or replace any part of the
freezer for servicing without first contacting the So-Low Service Department.
BEFORE CALLING THE MANUFACTURER’S TECHNICAL SUPPORT DEPARTMENT
Please have the model number of the unit, box identification number, and serial number ready as
well as the problem description. The model, serial number and box id number can be found on
the serial tag, which is located on the interior left upper wall, or back of the unit.
SAVE THESE INSTRUCTIONS

Table of Contents
1. Application Notes
1
2.Safety Instructions
2
3.Precautions in Use
4
4.Installation
4
4
.1
Installation Environment
4
4
.2
Installation Site
4
4
.3
Preparation before Use
5
4
.4
First Power-on
5
4
.5 Operation after Power Failure
5
5.Product composition and overview
6
6.Operating Instructions
7
6.1 Function Introduction
7-9
6.2 Optional function
10
7.Maintenance and Service
10
7.1 Equipment Maintenance
10
7.2
Equipment Discontinuation
11
7.3 Maintenance, Replacement, and Recovery of Rechargeable Batteries
11
8.Troubleshooting and Maintenance Services
12
9.Specifications
13
10.Packing List
13
11.Electrical Schematic Diagram
14

1
1.Application Notes
Thank you for choosing and using our products! For your safe and convenient use and reasonable
maintenance of the equipment, please read the Operation Instructions carefully before use and keep it properly
for reference
The equipment operator can copy some chapters of this operation manual, but only for internal use, for
example, to instruct the user how to deal with emergencies. These chapters are clearly marked in the catalog
of the manual.
So-Low Environmental has obligation and responsibility for any instrument damage caused by the user's failure
to use the equipment according to the instructions or the method specified by the manufacturer.
Due to the rapid improvement of our products, the functions described in the instructions may be inconsistent
with those of the products you purchased. Please refer to the physical functions.
Please carefully read the Attention and Safety Precautions (in 2. Safety Instructions).

During transportation or use, no violent vibration or collision is allowed, and the
refrigerator shall be kept away from rain. Store in a clean room with humidity of no more
than 80 %, no corrosive gas and good ventilation.

Pharmacy/Medical refrigerators (hereinafter referred to as equipment) can only be
operated by trained and authorized personnel.

Maintenance of the equipment can only be completed by us, or an agent
authorized by us.
If the operator encounters any situation not mentioned in this manual, please contact
So-Low Environmental or an agent authorized by us for the correct handling method.

If the equipment is not used according to the method specified in the specification, it
may be damaged.
Try to use the accessories provided by us. If users would
like to use other accessories, we will not be responsible for the adverse
consequences caused therefrom.

Equipment must be inspected and maintained regularly to ensure good operation of the
equipment.
Tips
Properly use protective equipment (including protective clothing, protective gloves,
goggles, etc.)
Keep good hygiene habits

Please pay attention to safety when using this product

Keep clear of obstruction all ventilation openings in the appliance enclosure or in the
structure for building-in.
Do not use mechanical devices or other means to accelerate the defrosting process, other
than those recommended by the manufacturer.
Do not damage the refrigerating circuit.

Do not use electrical appliances inside the food/ice storage compartments unless they are of
the type recommended by the manufacturer.

2.Safety Instructions
When using this product for the first time, please pay attention to the meaning of the following warning signs
and carefully read the safety precautions, so that you can use this equipment safely and correctly.
Warning! Failure to observe the
Attention! Failure to observe the precautions
precautions may result in serious personal
may result in personal injury or equipment
injury or death.
failure and related property losses.
Protective conductor terminal
Risk of Exploration This sign indicates the
risk of explosion when using volatile and
explosive chemicals.
Do not place it obliquely
Avoid direct sunlight
Beware of electric shock.
Beware of fire
This equipment is a precision instrument
Warning: Failure to observe the precautions may result in serious personal injury or
death.
Do not touch the equipment with wet hands to avoid electric shock; Equipment shall not be grounded through
gas pipeline, water supply pipeline, telephone line or lightning rod, which may easily cause electric shock.
This equipment can only be installed by professional technicians or after-sales maintenance personnel, it
may cause electric shock or fire.
Please handle the power cord carefully to avoid short circuits or open circuits. Please turn off the power
before pulling out the power plug. Don't bundle the power cord, don't press it under furniture or heavy
objects.
After installation, the power plug must be within reach, so that the power plug can be unplugged in time in
case of emergency.
Be sure to install the equipment on solid and flat ground and take due care to prevent tipping over. If the
ground is not solid enough or the installation location is not appropriate, it may cause the equipment to
fall over and cause equipment damage or personal injury.
Do not lengthen the power cord without authorization to avoid heating or fire.
Do not use the power supply that is not specified in the equipment design, to avoid overheating, short
circuit, and other faults.
This equipment adopts a 110V/60HZ AC power supply. If the operating voltage is too low or too high, a
suitable automatic voltage stabilizer must be installed for cooperative use.
Please place the equipment stably and avoid shaking.
Do not place the equipment in a dangerous area, and do not operate the equipment near flammable items
to prevent explosion or fire accidents.
2

Do not place the equipment in areas exposed to the sun or rain, to prevent danger such as short circuit or
overheating.
Do not tilt or lay the equipment sideways, and do not impact the equipment body; Refrigeration systems are
installed in the equipment, which is easy to be damaged by tilt or impact.
Please place the equipment in a dry and dust-free environment to avoid risks such as overheating, and short circuit.
In case of unexpected sound, smell, smoke, etc. when the power is turned on, please unplug the power in
time and contact the manufacturer or supplier.
Please place the equipment in a dry and ventilated environment and ensure that the equipment vents and
instrument surfaces are not blocked or shielded by walls or other objects; Do not use it in a poorly ventilated
environment to prevent damage caused by heat released by equipment.
It is forbidden to disassemble and modify this equipment without authorization, to avoid potential safety
hazards. In this case, So-Low will not bear any responsibility for quality accidents.
It is forbidden to put flammable and explosive dangerous goods, strong corrosive acids, alkalis and other
items unsuitable for the equipment in the equipment.
When storing toxic, harmful, or radioactive materials, please use the equipment in safe areas. Improper use
may cause harm to human health or the environment.
Metal objects such as nails or iron wires shall not be inserted into any aperture and gap or any outlet of the
equipment, otherwise electric shock or injury may be caused due to accidental contact between the above
objects and moving parts.
To ensure the normal operation and ventilation and heat dissipation of the equipment,the back, left and right
sides of the cabinet shall be at least 1-2 inches away from the wall, and the air inlet and air outlet must not
be blocked by obstacles!
This equipment must be connected to a ground wire.
Note: Failure to observe the precautions may result in personal injury or equipment failure and
related property losses.
It is forbidden to store living animals, flowers, or other items with strict temperature requirements in
the equipment.
When the equipment is running, do not touch the inner surface of the cabinet without wearing protective gear.
Hold the handle and close the door to avoid pinching your fingers; When the equipment is not used for a long
time, please unplug it and pack it for storage.
When restarting the equipment after power failure or power off, please check the equipment settings first,
otherwise the stored items may be damaged due to the change of settings.
The equipment can be used for item preservation, not as production equipment!
Keep the keys in a safe location.
When handling the equipment, please be careful not to tip over the equipment, to prevent equipment
damage or personal injury.
When handling, it shall be lifted from the bottom, with the inclined plane is not greater than 45°, and it shall
be handled with care. Please use the equipment in safe areas. Improper use may cause harm to human
health or the environment.
3

3. Precautions in Use
Before putting the items into the equipment, please confirm that the temperature in the freezer storage chamber has
reached the set value first, and then put the articles in batches. Every time you put in items; they shall not exceed 1/3 of
the inner volume of the freezer storage chamber to prevent excessive temperature rise.

The equipment temperature display value is the temperature at the temperature sensor in the freezer storage chamber.
There is a certain gap between the displayed temperature and the actual temperature at the center of the equipment when
the equipment just starts running, but as the equipment enters a stable state, the displayed temperature will gradually
approach the actual temperature.

Please use a diluted neutral cleaner to clean the equipment, and do not use brushes, acid, gasoline, soap powder,
polishing agent, or hot water to clean the equipment, otherwise the painted surface and plastic rubber parts may be
damaged. Be careful not to wipe plastic rubber parts with volatile solvents such as gasoline.

When the equipment is not used for a long time, the power supply shall be cut off.
4.Product Installation
4.1 Installation Environment
Ambient temperature: 16℃~ 32℃, the most ideal temperature is 18℃~ 25℃, and the air conditioning system
shall be used when necessary.

Relative humidity: ≤80%RH.

There is no strong vibration and corrosive gas around.

Avoid the existence of a large amount of dust.

Avoid rocking or shaking the equipment.

Elevation of the working position of the equipment: less than 2000m.

Indoor use, pollution degree 2, and overvoltage category II.

Input voltage AC single-phase 110V.

There is no direct sunlight, other cold and heat sources, and strong electromagnetic interference, which
will affect the normal operation of the control system and directly damage the system in severe cases.
4.2 Installation Site
To operate the equipment normally and obtain the best performance level, the installation site
of the equipment shall meet the following requirements:
It cannot be installed in a narrow and closed space, and the door of the room shall not be
smaller or lower than this equipment, which shall at least ensure the normal access of the
equipment, to avoid the maintenance difficulties in case of equipment failure, which may
result in damage to stored items due to the failure to repair the equipment in time.

The installation floor must be solid, flat, non-combustible, and able to bear the weight of
the equipment during operation.

It shall be with good ventilation, and direct sunlight shall be avoided.

Each piece of equipment needs to use a power outlet independently.
Please ensure that the current by the power outlet shall be ≥10A, and the plug and outlet are firmly connected.
Check the working voltage before use. In areas with unstable voltage, consider using a
voltage stabilizer suitable for equipment load. The power of the voltage stabilizer is greater than
4KW to ensure that the input voltage requirements in the installation environment are met.
Equipment shall be reliably grounded. If the power cord outlet is equipped with grounding
wire, check whether the grounding is good before use. If the outlet is not equipped with
grounding wire, it must be installed by professional engineers and technicians.
Attention: Since the ambient temperature has great influence on the equipment, if the above
environmental requirements cannot be met, the equipment may not run normally. Please
improve the environment before using the equipment; The equipment is operated intermittently
4

4.3 Preparation beforeUse:
1. Remove the outer packaging ofall products (including the protective foam in the packaging box)
2. Inventory of accessories: Please check the accessories and materials according to the packing list.
3. Cleaning: Clean the product once before use.
4.4 First Power-on
When using the equipment for the first time, please follow these steps:
1. After the equipment is placed, leveled, and cleaned, it shall stand for more than 24 hours, and then power it on
to ensure the normal operation of the equipment.
2. Under no-load condition, connect the power cord to a dedicated outlet with appropriate specifications.
3. After plugging in, turn on the power switch of the equipment.
4. Check whether the operating temperature of the equipment reaches the required value, observe the normal
start and stop of the equipment for 24 hours, and put a small amount of items in the freezer after confirming
the normal performance.
5. Please store items in batches, with the items not exceeding 1/3 of the freezer volume each time.
6. Try not to open the door during cooling, otherwise the temperature will rise.
4.5 Operation after PowerFailure
1. The equipment has a memory function for the set value. When the power is restored after power failure, the equipment
will continue to operate before power failure.
2. Once the equipment is powered off, it requires 5 minutes before it can be switched on again, so as to avoid
damaging the compressor.
3. We guarantee the normal operation of this equipment under certain conditions, but we are not responsible for
any loss or damage of stored items after a power failure.
Notes:
◆ Aspecialpersonshallbe responsibleforcheckingandrecordingtherunningstatusoftheequipmenteveryday
(recordand checkonce every 2-4 hours).Incaseoffailureorshutdown,thetemperatureinthefreezer willrise.
Ifitcannot be repaired in a short time, please take out the stored items and transfer them to a place that
meets the temperature requirements for storage to avoid damage to the items.
◆ Before putting items into the equipment, it shall be confirmed in advance whether the temperature range of the
equipment meets the temperature requirement of the items, so as to avoid damage to stored items due to the
differencebetweenthe settabletemperatureoftheequipmentand therequiredtemperatureoftheitems.Please
payattentionnottoblock theair outlet and air inlet when putting items into the equipment.
◆ Dueto the refrigerationinertia, thereisa certaindifferencebetween theactualdisplaytemperature
andthe settemperature of the equipment, which is a normal phenomenon.
◆ The equipment is an item storage equipment, which cannot be used for routine production operations. It is
strictly forbiddentoputtoo manyitemswhicharerelativelyhotintotheequipmentatonetime,otherwisethe
compressorwillrun foralong time,andbe burneddueto high temperature.Itemsmust be putin batches,soas
toensurethat the freezer is cooled step by step until the temperature required for storing items isreached.
◆ Electrical appliances without production license shall not be usedinside the equipment.
◆ Donotchangethesettemperaturefrequentlyina shorttime,otherwisetheexpectedsettingeffectmaynotbe
achieved duetothelargetemperatureinertia;Ensurethatthereisacertainaircirculationspacearoundthe
cabinetwhenputtingin items, especially do not block the temperature sensor in the cabinet (for collecting
the temperature of the cabinet), otherwise itwill affectthe stability and accurate control ofthe temperature in
thefreezer body!
◆ Itemsshallnotbeplaced directlyatthebottom ofthefreezer,but onthebottomshelf, otherwisethe
refrigerationeffectofthe equipment will be affected.
◆ When putting in items, if the moisture content of the items is too much or too little, it will affect the humidity
change in thecabinet, so it is best to keep the items sealed; The humidity of the working environment will affect
thechangeofhumidity in the cabinet, especially if the door is opened too frequently and the door is not closed
properly
5

5. Component Composition
Display control panel
Door handle Foam door
Cabinet
Door lock
Leveling foot
DHK25-10SD/DHK40-10SD MV30-4UCF/MV40-4UCF
* Due to the improvement of products and model diffierences, the actual products may be different from the diagram.
Please refer to the actual products! The diagram is only used for functional parts description.
* Structure and composition The product consists of freezer body, door (glass door structure or foam door structure),
refrigeration system and control system.
Intended use:
* Scope of application: It is suitable for storing items in hospitals, pharmacies, epidemic prevention stations, research
institutions, biopharmaceuticals and other units.
* The storage temperature inside the box can be adjusted through the temperature button on the control panel, which is
convenient to use and reliable in performance.
* The freezer comes with drawers, each of which can hold 40 pounds.
6

6. Operating Instructions
6.1 Function Introduction
a
b
c
h
g
f
e
d
Type A control panel
Function description of Type A control panel(Applicable to MV40-4UCF,MV30-4UCF,DHK25-10SD,DHK40-10SD)
1.Control board introduction:
a. -25 is display window for temperature. Under normal operating conditions, the average
temperature of the freezer compartment in the cabinet is displayed in units of °C; Different running
status can be displayed in the setup state (see below for details).
b. Door opening indicator : when the door is opened, the indicator light will be on. when the
door is opened more than 1 minute, the indicator lighting with buzzer alarm, display "do".
c. Fault indicator: The indicator is off when the product is operating normally; the indicator is on
when the product is operating abnormally.
d.“PRINT”: The system can retain 7 days of data for printing. Press the Print key to print
the temperature for the set period of time.
e. In parameter setting mode, move to the previous parameter or decrease the value of
the parameter. For example, when adjust the set temperature, press this button to reduce the
set temperature. When adjust the parameter value, long press the key to quickly decrease the
parameter.
f. In parameter setting mode, you can move to the next parameter or increase the value of
the parameter. For example, when adjust the set temperature, press this button to increase the
set temperature value. When adjust the parameter value, press and hold the up button for a
long time and the parameter will increase rapidly. Under normal conditions, press and hold the
key for 3 seconds to import the U disk for 12 months.
g. is the button for set/mute, when there is no alarm state and the key is not unlocked, press
,Displaying ambient temperature for 5 seconds and then restores normal display;
In the unlockedstate, press for 3 seconds, can enter the user menu. When buzzer alarm
(including high temperature alarm, door open alarm, sensor fault alarm, etc.), in the locked state,
first time press , Buzzer stops tweeting, 5 seconds after showing ambient temperature, resume
normal display (The key mute is only to turn off the buzzer of this abnormal state alarm. If the fault
is not eliminated, the buzzer will continue to alarm when the next exception occurs),
press again, buzzer alarms, After the ambient temperature is displayed for 5 seconds, the
cabinet temperature and alarm status are restored. When the press is under unlocked state,
can be used as a set button.
In the unlock state, in the parameter setting mode, press this key to display the value and
the parameter name. If the pressed time is longer than 3 seconds, the setting will be saved and
returned to normal interface. 7

h. USB data ；
Automatic export: when the U disk is connected to the USB interface, the recorder buzzer will chirp
once and display "on". PDF files of data that not currently exported will be generated in the U disk.
After data transmission, the buzzer will chirp once again and display "End".After 6s, it will return to
normal display.
Note: when the data is very little, the digital tube will not display "on" and "End".
Manually export: If the button is under locked state, after connecting U disk well and buzzer alarm
for one time, press upper button for 3 seconds, digital tube display “d01”, Press the up button
or down button to adjust “d00~d12”, press , The U disk internally generates a PDF file that
generates this file (d00) or generates the data recorded in the previous month (1-12).
2.Function settings
a.Power on, open the power switch on the back of the cabient, the machine can enter the
working state;
b.User parameter settings:
Unlock: In the normal running state, press the key and for 3 seconds at the same
time, the digital tube will display the parameter code "0000", and input the password
"0005" (enter the user menu password, enter "0099" to restore the key lock password to the
default "0005"), Unlock at this time. Press the key for 3 seconds after unlocking, the
digital tube displays the parameter code
"PS1" and enters the setting adjustment.
c.Use the up or down key to scroll through the parameters. The display order is b1-b2-Set-H-L-
n-y-r-S-F-Pt-tH1-P1-PS1.
Press the key to confirm the category. The first parameter name of this type of parameter
will be displayed.
1. Press or to scroll through the values
2. Press the to display the corresponding value
3. Press or to increase or decrease the value
4. Press the to temporarily store the modified value of the lock and return to the
display parameter.
5. If you need to modify other parameters, repeat steps 1-4.
6. Press the for more than 3 seconds to store the modified parameter and return to
the display parameter category.
d. Press the for more than 3 seconds, or if there is no button within 60 seconds, exit the
parameter setting program.
8

4.Parameter display
NO.
Menu item
Parameter Range
Suggested settings
Remarks
1
b1
V1.0-9.9
1.0
Hardware version
2
b2
V1.0-9.9
1.1
Software version
3
Set
-10~-25
-25
Temperature setting
Set value of high temperature alarm set+H;
4
H
0.0~10.0
5.0
When H=0, the alarm is deactivated; When the
temperature is higher than the high temp alarm
set temperature alarm displays H1
Set value of low temperature alarm set-L;
5
L
0.0~10.0
5.0
When L=0, the alarm is deactivated; When the
temperature is lower than low temp set the
low temperature alarm displays L1
6
Pt
0~240min
20
Print interval
7
tH1
20.0~50.0℃
40.0
Upper limit of ambient temperature alarm
8
PS1
0000~9999
0005
User menu password settings
9
MAX
-
-
The highest temperature since last clearance
10
NIN
-
-
The lowest temperature since last clearance
11
CLR
-
-
Clearance of the Max and Min temperature
records
Quick setting of time after power on
After the power-on self-test on the display board is completed, the quick setting menu is displayed.
Menu item
Menu
Menu description
Set range
Default
Unit
n
Set logger module time - year
10~50
/
y
Set logger module time - month
1~12
--
/
Quick
r
Set logger module time - day
01~31
--
/
S
Set logger module time - hour
00~23
--
/
Settings
F
Set logger module time - minute
00~59
--
/
menu
Pt
Print interval
0~240
20
min
SCY
Temperature data recording period
0~240
10
min
0: shielded
recorder
If there is no operation for 60 seconds under the quick setting menu, it will automatically exit the quick setting menu and return
to normal display.
5.Alarm display
Alarm Code
Fault description
H1
High temperature alarm
L1
Low temperature alarm
H2
High ambient temperature alarm
door
Door open alarm
PF
Power failure alarm
bL
Low battery alarm
Er
Data Logging not connected
LoF
Data Logging not started
EE
Communication error
9

6.2 Functional fittings
1.Printer
Automatic printing:
When the printing interval Pt is not 0, the printer prints the current data every Pt minutes.
Note: When the printing interval Pt is less than the recording interval SCy, it is printed according to
the recording interval; the remaining printing intervals are printed as an integral multiple of the
recording interval Scy, that is: the printing interval Pt should be set as an integral multiple of the
recording interval.
Manual printing:
When the key is unlocked and the working voltage is normal, press the print key to display "P01" by
the digital tube, press the up key or down key to adjust "P00～P07." Press the set/mute multiplexing
key or print key, and the printer will cancel the manual printing (P00) or print the data recorded in
the previous days (1 ~ 7), with the data interval same as the automatic printing interval. Printing
paper installation:
The printing paper has been installed at the factory. When the paper is used up after a long time,
you may purchase the same paper for installation. The installation steps are as follows:
①Click the cylindrical button on the printer to open the cover of the printer;
②Put the printing paper into the printer box and pull the paper head of the roll so that the paper
slightly exposes from the upper port of the box cover after the box cover of the printer is closed.
③Close the box cover.
2.Remote alarm terminal and RS485 interface
The remote alarm terminal is installed in the back of refrigerator and the alarm signal is output by the terminal.
The terminal bearing capacity is SELV DC 30V, 2A.
Normally
open N.O.
Common COM
Normally
closed N.C.
Max DC30V 2A
7.Defrost，Discontinuation and Maintenance
Warning:
In order to prevent people from getting electric shock or injury, please cut off the power supply
of the equipment before any repairs and maintenance
Make sure you don't inhale drugs or suspended particles around it when maintaining
the equipment, otherwise it will harm your health
7.1. Equipment Maintenance
Defrosting: The equipment will automatically defrost during the working process for the convenience of
use. Cleaning and maintenance: The equipment should be cleaned and maintained regularly (for safety,
please remove the power plug), and the inner and outer surfaces of the freezer should be wiped with a
warm, damp soft cloth.
10

Notes:
Do not use sharp metal appliances during defrosting to avoid damage to the freezer.
Do not position the equipment so that it is difficult to operate the disconnecting device of separable
plug.

Protection impairment if used in a manner not specified by the manufacturer.
The power relay switch on the back of the case can not only contact and open the power circuit, but
also provide immediate protection in the event of short-circuit faults, severe loads and undervoltage in
the power circuit, and it can also be used to start the compressor infrequently to protect the equipment.
7.2. Equipment Discontinuation
Deactivation: If the equipment is stored in an unsupervised area for a long time and not used, the power
supply should be cut off and the inner and outer surfaces of the freezer should be cleaned with a warm,
damp soft cloth, aired and sealed. The equipment must be locked to ensure that children cannot open the
freezer door.
Scrapping: When the equipment reaches the end of its service life, it should be scrapped and must be
handed over to a qualified professional recycling agency for disposal per local regulations. Non-
professionals are not allowed to disassemble and break down the equipment without authorization. The
scrapped equipment should be placed in a designated area inaccessible to children to avoid danger.
7.3 Maintenance, Replacement, and Recovery of Rechargeable Batteries
Battery installation position: top of the freezer body and bottom inside the electrical
box. 1. Battery maintenance
①In order to prolong the service life of the battery and avoid the product being left unused for a long
time, the product must be operated for more than 24 hours every month to facilitate charging.
②When the equipment is not used for a long time, it should be connected to the working power regularly
(generally once a month), and the power lock switch should be turned on so that the equipment can run
for a period of time to complete charging, and each charging time should be no less than 24 hours;
③When the working power supply is interrupted, the power lock switch of the equipment shall be turned
off in time, otherwise it will cause power loss in battery and even permanent damage to the battery in
severe cases;
④The main power switch must be turned off during a long-term power outage or during transportation,
otherwise long-term discharge causes power loss in battery and even permanent damage to the
battery, and the display is abnormal after re-energizing;
⑤The battery is a consumable, with a service life of about 2-3 years. If the battery is used improperly,
such as power loss or reaching the end of battery life, it will cause a low battery alarm (refrigeration is
not affected, but there is an alarm failure and influence to the use function of the printer, please contact
our local distributor after-sales staff for replacement).
2. Battery replacement and recovery
①Turn off the power switch and pull out the power plug from the outlet;
②Remove the screws on the electrical box with a screwdriver. (Note: There are high-voltage electrical
components in the electrical box, therefore before opening, turn off the power supply, unplug the power
plug and turn off the power lock switch of the freezer, and the electrical box can only be opened by
qualified engineers or maintenance personnel).
③Pull out the battery connecting cable; (Before unplugging the battery fixing cable, pay attention to the
cathode/anode of the battery and the sequence of the connecting cables, so as to prevent burning down
the control system due to installation of the new battery with cathode/anode reversed. Generally, the red
wire is connected to the cathode, and the black wire is connected to the anode.
④Use a screwdriver to remove the fastening screws on the battery fixing plate and take out the
battery; ⑤The battery model is BT-12M4.0AC(12V4.0AH);
⑥For a replaced battery that can be recycled, please contact the local battery recycling agency.
Tips: In order to effectively ensure that the battery replacement meets the requirements of the control
system and avoid the influence of improper operation on the system, please contact our after-sales
personnel for replacement or guidance.
11

8.After-sales service
Any product may fail. Please observe the operation of equipment while in use.
Fan motor replacement time: about 6 years; Service life of the product: 10 years.
Problems
Causes and solutions
Please make sure that the outlet is energized.
Equipment does not work
Please make sure power plug is plugged in,not loose.
Please make sure the power fuse is not disconnected.
Please make sure the supply voltage is appropriate,not too low or
too high.
Compressor is not running
Please make sure that the temperature is set correctly.
Please check whether the temperature inside the cabinet is too low.
The temperature does not
Please make sure that the door is closed tightly and don't open it
too many times during a short time.
reach the set value
Please don't put too many items in at one time.
Please make sure that the ambinet temperature is not too high.
High noise
Please make sure that the freezer body is placed on a flat ground.
Please make sure that the freezer body does not contact the wall.
Condensation on freezer body
In rainy and humid seasons, door condensation is
surface
normal, and it shall be wiped off with a dry cloth.
Undesirable odor
Equipment needs to be cleaned. Items
with heavy smell are not packed.
After the equipment is used for a period of time, the door seal
The door is not closed properly,
becomes hard and deformed.
Maintenance method: Blow the deformed part of the hot seal
and the cool air leaks
with a blower to soften it, and then close and compress it after
the door seal becomes soft.
If the items were just put in,it will be automatically eliminated
after
running for a period of time when the temperature is stable .
The alarm lamp flashes and
Please check if it is because the door is not locked.
Please check if it is because of the low battery,which will be
the buzzer is triggered
automatically eliminated after a period of running.
Please make sure the temperature is not exceeding the
standard.
12

The following conditions are not faults:
①When the compressor starts and stops, the equipment parts will make a slight impact sound
②When overheated items are put in after the door is opened, high temperature alarm and high humidity
alarm will be triggered in the control system (if this function is available, please refer to the alarm display
table)；
Solution: Put the items into the equipment after they are naturally cooled. Put the items in small quantities
in batches, and do not put too much at a time. After the system runs stably, the high temperature alarm
and high humidity alarm will be released automatically.
③Slight sound of running water caused by refrigerant flowing in the pipeline.
Notes:
The equipment can only be repaired, maintained or improved by the engineers certified by us,
so as to ensure the normal operation of the equipment and the compliance with corresponding
safety standards.
Please clean and disinfect the equipment before notifying the maintenance engineer; During the
warranty period of the equipment, the Company will not undertake the warranty obligation if the
fault or damage is caused by improper use of the user.
Ambient temperature for storage: -40°C-+55°C, relative humidity: 10% ~ 90%.


9. Specification
Ambient
Rated
Rated
Temp
Effective
Model
Refrigerant
voltage
frequency
Range
temperature
volume (L)
(v~)
(Hz)
(°C)
MV30-4UCF
16～32℃
R600a
110
60
-10～-25℃
90
MV40-4UCF
16～32℃
R290
110
60
-20～-40℃
90
DHK25-10SD
16～32℃
R600a
110
60
-10～-25℃
270
DHK40-10SD
16～32℃
R290
110
60
-20～-40℃
270
*The foaming material of this product is cyclopentane.
10.Accessories
Name
Operation Manual
Key
Defrosting shovel
Number
1
2
1
* The specific packing list shall be subject to the physical objects received.
13

Circuit diagram
Battery
Printer
Display PCB
Sensor
Sensor
for
for control
room
Sensor
for
ambient
TEMP
Sensor
for
door
for
SPS
USB
Control PCB
Fan for
evaporator
LED Light
Power plug Power switch
Controller
set
Transformer
Note: some models don't have the optional parts within the Compressor set
dotted line, the detailed is subject to the available
Fan for
condenser
Fan for
Heater
evaporator for door
Alarm