Phcbi MDF-DU703VH User manual

MDF-DU703VH
Please read the operating instructions carefully before using this product, and keep the operating
instructions for future use.
See page 100 for all model numbers.
MDF-DU703VH
MDF-DU503VH
MDF-DU703VHA
MDF-DU503VHA
Operating Instructions
Ultra-Low Temperature Freezer

2
CONTENTS
1. BEFORE USING
SAFETY PRECAUTIONS..........................................................................................................5
SYMBOLS ON UNIT .................................................................................................................9
FOR SAFELY STORING SAMPLES .......................................................................................10
About backup cooling system ..............................................................................................10
In the event of emergency ................................................................................................... 11
INSTALLATION SITE ..............................................................................................................12
INSTALLATION .......................................................................................................................13
FREEZER COMPONENTS.....................................................................................................14
Main body ............................................................................................................................14
Accessories .........................................................................................................................16
Remote alarm terminals.......................................................................................................16
START-UP PROCEDURE .......................................................................................................17
Operation during power failure ............................................................................................18
Operation after recovery from power failure ........................................................................18
2. TOUCH PANEL OPERATION
USING THE TOUCH PANEL...................................................................................................19
Basic Operation ...................................................................................................................19
Entering alphanumeric values and dates.............................................................................19
Other operations ..................................................................................................................21
HOME SCREEN......................................................................................................................22
SIDEBAR MENU BUTTONS...................................................................................................24
3. SECURITY MODE
SETTING SECURITY MODE ..................................................................................................26
Introduction to the security mode.........................................................................................26
Setting the security mode to ON..........................................................................................27
Setting the security mode to OFF ........................................................................................29
ACCOUNT MANAGEMENT BY ADMINISTRATOR ........................................................................30
Creating a user account.......................................................................................................30
Viewing user account list .....................................................................................................36
Changing user account data................................................................................................37
Deleting a user account .......................................................................................................41
ACCOUNT OPERATION BY GENERAL USER ......................................................................42
Registering a face recognition image and an IC card/NFC device ......................................42
Viewing your account information........................................................................................46
Changing user account data................................................................................................46
ELECTRIC LOCK AND LOGIN/LOGOUT ...............................................................................50
About electric lock................................................................................................................50
Setting electric lock (log in/log out method) .........................................................................51
Unlocking (logging in) by the Login button...........................................................................53
Unlocking (logging in) by auto face recognition ...................................................................56
Unlocking (logging in) by NFC authentication......................................................................57
Locking/unlocking the outer door during power failure ........................................................58
4. SETTINGS AND OPERATION
SETTING FOR BASIC OPERATION.......................................................................................59
Setting temperature and high/low alarms ............................................................................59
Configuring other alarm settings and compressor delay time..............................................60
About alarm test...................................................................................................................61

3
SCREEN LOCK.......................................................................................................................62
Setting screen lock ..............................................................................................................62
Operation when screen lock is ON ......................................................................................64
Turning OFF the screen lock setting....................................................................................64
OTHER SETTINGS.................................................................................................................66
Setting date and time...........................................................................................................66
Setting brightness and sleep ...............................................................................................67
Setting unit name.................................................................................................................68
Setting DAQ.........................................................................................................................69
EVENT LOG............................................................................................................................70
Event Log screen.................................................................................................................70
Viewing the event log data...................................................................................................71
Viewing and acknowledging pending items .........................................................................72
Exporting event log data ......................................................................................................73
OPERATION LOG CHART......................................................................................................76
Chart screen ........................................................................................................................76
Displaying operation log chart .............................................................................................77
Exporting operation log data................................................................................................78
IMPORTING/EXPORTING DATA ............................................................................................79
Exporting log data................................................................................................................79
Exporting user account data and freezer setting data .........................................................81
Importing user account data ................................................................................................82
Importing freezer setting data ..............................................................................................84
5. MAINTENANCE AND TROUBLESHOOTING
ALARMS AND SELF-DIAGNOSIS ..........................................................................................86
Alarm messages ..................................................................................................................86
Notice messages .................................................................................................................87
Alarm and Buzzer Stop button.............................................................................................88
ROUTINE MAINTENANCE .....................................................................................................89
Cleaning the exterior, interior, and accessories ...................................................................89
Cleaning the condenser filter ...............................................................................................89
Defrosting the chamber .......................................................................................................90
CALIBRATION.........................................................................................................................90
REPLACEMENT OF CONSUMABLE PARTS.........................................................................91
Replacing the battery for power failure alarm ......................................................................91
Replacing the battery for backup cooling system (option) ...................................................91
TROUBLESHOOTING ............................................................................................................92
DISPOSAL OF UNIT ...............................................................................................................94
Recycle of battery ................................................................................................................94
Deleting personal information (user account data) ..............................................................94
6. OPTIONS & SPECIFICATIONS etc.
OPTIONAL COMPONENTS....................................................................................................95
NFC Reader (MTR-NFC).....................................................................................................95
IC card (MTR-IC) .................................................................................................................95
Temperature recorder (MTR-G85A).....................................................................................95
Small inner doors (MDF-5ID4/5ID5, MDF-7ID4/7ID5) .........................................................96
Backup cooling kit (MDF-UB9) ............................................................................................96
SETTING OF SHELF STOPPERS WHEN USING INVENTORY RACKS ..............................97
SPECIFICATIONS...................................................................................................................98
PERFORMANCE ..................................................................................................................100
SAFETY ENVIRONMENTAL CONDITIONS .........................................................................101
SAFETY CHECK SHEET ......................................................................................................102
USE OF OPEN-SOURCE SOFTWARE ................................................................................103

4
1. BEFORE USING
INTRODUCTION
■Read the operating instructions carefully before using the product and follow the instructions for safe
operation.
■PHC Corporation takes no responsibility for safety if the product is not used as intended or is used with
any procedures other than those given in the operating instructions.
■Keep the operating instructions in a suitable place so that they can be referred to as necessary.
■The operating instructions are subject to change without notice for improvement of performance or
function.
■Contact our sales representative or agent if any page of the operating instructions is missing or the page
order is incorrect, or if the instructions are unclear or inaccurate.
■No part of the operating instructions may be reproduced in any form without the express written
permission of PHC Corporation.
<Intended Use>
This equipment is designed for low temperature storage of biomedical samples.
IMPORTANT NOTICE
PHC Corporation guarantees this product under certain warranty conditions. However, please note that
PHC Corporation shall not be responsible for:
●any loss or damage to the contents of the product
●any indirect damage caused by data damage or loss
●any damage caused by the use of the face recognition function or inoperative face recognition
function

1. BEFORE USING
5
SAFETY PRECAUTIONS
Be sure to observe the operating instructions as they contain important
safety advice.
For correct and safety use of the product, follow the precautions and procedures in this
operating instructions carefully. Failure to do so could result in injury or damage to the
product.
Precautions are illustrated in the following way:
The following symbols are used in this document and some of them are attached to the unit.
Actions are prohibited.
The illustration in the circle and the description adjacent to the symbol provide detailed
information about the action which is prohibited.
Actions are mandatory.
The illustration in the circle and the description adjacent to the symbol provide detailed
information about the action to be taken.
Caution must be taken.
The description adjacent to the symbol provides detailed information about the caution
to be taken.
This symbol indicates the possibility of an electric shock. High-voltage electrical
components are placed under the covers. Only a qualified engineer or service personnel
should be allowed to open these covers.
This symbol indicates that there is flammable gas inside the unit. There may be a risk of
fire or explosion. Keep away from any ignition sources.
This symbol indicates low temperature or freezing conditions.
Take care to avoid exposure to low temperature or freezing conditions.
This symbol indicates earth. Connect the earth terminal to the ground to prevent an
electric shock.
WARNING
Warning indicates a potentially hazardous situation which, if not avoided,
could result in serious in
j
ur
y
or death.
CAUTION
Failure to observe CAUTION signs could result in injury to personnel and
damage to the unit and associated property.
For the State of California, USA Only:
This product contains a CR Coin Cell Lithium Battery which contains Perchlorate Material – special handling
may apply. See www.dtsc.ca.gov/hazardouswaste/perchlorate.

6
SAFETY PRECAUTIONS




Installation 

Do not use the unit outdoors.
Exposure to rain may cause an electric leakage and/or an electric shock.
Do not install the unit in a location where flammable or volatile substances are present.
Installing the unit in such a location may cause explosions and/or a fire.
Do not install the unit in a location where there are high levels of moisture or where it
may be splashed with water.
This may cause the insulation to deteriorate, leading to an electric leakage and/or an electric
shock.
Do not install the unit in a location where corrosive gases such as acids are present.
Deterioration of the insulation due to corrosion of the electric components may cause an electric
leakage or an electric shock. Also, corrosion of the refrigerant piping can result in explosions
and/or a fire caused by gas leakage.
Do not leave the plastic bags used for packing in a place where they can be reached by
small children.
This may result in unexpected accidents such as suffocation.

Only qualified engineers or service personnel should install the unit.
Installation by unqualified personnel may cause water leakage, an electric shock, or a fire.
Install the unit in a location capable of bearing the total combined weight (product +
optional accessories + stored items). After installing the unit, be absolutely sure to take
precautions to prevent the unit from falling over.
If the unit is installed in a location which is not strong enough or if the proper precautions are not
taken, the unit may fall over and cause injuries.
Connect the unit to a dedicated power source as indicated on the rating label attached
to the unit.
Use of any other voltage or frequency other than that on the rating label may cause a fire or an
electric shock. Also, a power strip may cause a fire resulting from abnormal heating.
When handling harmful samples (for example, those which consist of toxic, pathogenic
or radioactive substances), install the unit inside a designated isolation facility.
If the unit is installed in a location other than an isolation facility, there may be detrimental effects
on both people and the natural environment.
Install the unit in a well-ventilated (airy) location to prevent the accumulation of
flammable refrigerant.
- If flammable refrigerant leaks, it may accumulate and cause explosions or a fire.
- (When optional backup cooling system is installed) As with any equipment that uses CO2gas,
there is a likelihood of oxygen depletion in the vicinity of the equipment. It is important that you
assess the work site to ensure there is suitable and sufficient ventilation. If lack of ventilation
is suspected, then other methods of ensuring a safe environment must be considered. These
may include atmosphere monitoring systems and warning devices with alarms.
Risk of fire or explosion. Flammable refrigerant used.
The unit contains flammable refrigerant. Consult repair manual/owner’s guide before attempting
to install or service this product. All safety precautions must be followed.
This unit must be plugged into a dedicated circuit protected by branch circuit breaker.
Otherwise it may cause an electric shock or a fire.

Be absolutely sure to earth (ground) the unit to prevent an electric shock.
Failure to earth the product may cause an electric shock. If necessary, ask a qualified contractor
to do this work.
Do not connect the earth wire to a gas pipe, water pipe, or lightning rod when earthing
the unit.
Earthing the unit improperly may cause an electric shock.
WARNING

1. BEFORE USING
7





Power supply plug and cord


 Never damage the power supply cord or power supply plug (by breaking, adapting,
placing near a source of heat, bending with force, twisting, pulling, adding weight, or
binding).
A damaged power supply cord or power supply plug may cause an electric shock, a short
circuit, or a fire. Contact our sales representative or agent for repairing the cord and plug.
 Do not place this unit or other equipment in a position where it is difficult to disconnect
the power supply plug.
Failure to disconnect the power supply plug may cause a fire in the event of a problem or
malfunction.
 Do not pull the power supply cord, the power supply plug, or the product side plug
(inlet part) hard (MDF-DU703/503VHA-PA).
If the cord breaks, it may cause electric shock or fire.
 Do not use power cord for other electrical equipment (MDF-DU703/503VHA-PA).
Such power supply cord may cause fire or electric shock.

 Do not plug or unplug the power supply plug with wet hands.
This may cause an electric shock.

 Remove dust from the power supply plug periodically.
Dust on the power supply plug may lead to an insulation failure due to moisture and thus cause
a fire. Disconnect the power supply plug and wipe it with a dry cloth.
 Make sure the power supply plug is pushed fully in.
Faulty insertion of the power supply plug may cause an electric shock or a fire due to a
generation of heat. Never use a damaged power supply plug or loose power outlet.
 Grip the power supply plug when disconnecting the power supply cord from the outlet.
Pulling the power supply cord may cause an electric shock or a short circuit.
 Always use the detachable power supply cord that came with the product (MDF-
DU703/503VHA-PA).
Other power supply cord may cause electric shock or fire.

 Disconnect the power supply plug before moving the unit.
Take care not to damage the power supply cord. A damaged power supply cord may cause
an electric shock or a fire.
 Disconnect the power supply plug when the unit is not in use for long periods.
Keeping the unit connected may cause an electric shock, an electric leakage, or a fire due to
the deterioration of insulation.
 Before proceeding with maintenance or checking the unit, turn the power switch OFF
(if the switch is provided), and disconnect the power supply plug.
Performing the work while power is still being supplied to the product or while the power supply
plug is still connected may cause an electric shock and/or injuries.

When something is wrong with the unit

 Never disassemble, repair, or modify the unit yourself.
A high-voltage area is located inside the unit. Any work carried out by unauthorized personnel
may result in an electric shock. Contact our sales representative or agent for maintenance or
repair.

 Disconnect the power supply plug if something is wrong with the unit.
If the unit keeps running under such conditions, there may be a risk of an electric shock or a fire.
Contact our sales representative or agent immediately for maintenance or repair.

 Use designated parts for parts replacement.
Using an incorrect part may cause a fire.
WARNING

8
SAFETY PRECAUTIONS




When using the unit 

 Never put containers with liquid on top of the unit.
This may cause an electric shock or short circuit if the liquid is spilled.
 Never insert metal objects such as pins and wires into any vent, gap, or outlet on the
unit.
This may cause an electric shock or injury by accidental contact with moving parts.
 Do not use equipment or other measures for facilitating the defrosting work.
It may cause explosions and/or a fire in case of refrigerant leakage.

 Never splash water directly onto the unit.
This may cause an electric shock or short circuit.

 Never store volatile or flammable substances in this unit except in a sealed container.
Such substances may cause an explosion or a fire if they leak.
 Ask a qualified contractor to carry out replacement of the battery for the power failure
alarm and the battery for backup cooling system.
Improper handling will result in an electric shock or a fire.

 Do not give strong shock or vibration when moving or using the unit.
The piping may be damaged, causing a fire.
 Never damage the chamber wall or pipework in the chamber when removing frost.
It may cause explosions and/or a fire in case of refrigerant leakage.

 Flammable and explosive product.
The unit contains flammable refrigerant. When repairing or recycling the unit, only trained
service personnel should perform the work. Follow the procedure below.
Well ventilate the room to prevent refrigerant accumulation.
Keep fire away when the refrigerant is contained in the product.
Do not damage or break the pipework.
It may cause explosions and/or a fire in case of refrigerant leakage.


When storing and disposing the unit

 If the unit is to be stored unused in an unsupervised area for a long period, ensure that
children do not have access to the unit and that doors cannot be closed completely.
There may be a risk of child entrapment.
 Ask a qualified contractor to carry out disassembly/disposal of the unit and do not leave
the unit in a location that can be accessed by third parties
This may result in unexpected accidents (e.g. the unit may be used for unintended purposes).
 The unit contains flammable refrigerant. When the unit is disassembled or disposed of,
the work must be performed in a well-ventilated place and avoid the place near fire.
It may cause explosions and/or a fire in case of refrigerant leakage.
WARNING

1. BEFORE USING
9





 Do not touch stored samples in the chamber or inner walls of the chamber with bare
hands.
Frostbite can occur at low temperatures. Wear insulated gloves when reaching into the
chamber.
 Do not climb on top of the unit or put any objects on the unit.
Falling from the unit may cause injury; falling objects may cause damage to the unit.

 Turn the leveling feet to raise the casters above the floor and secure the unit.
If they are left touching the floor, the unit may inadvertently move out of position when its door
is opened or closed. It may cause injury.
 Never store corrosive substances such as acids or alkalis in this unit except in a sealed
container.
These may be harmful to your health and may cause corrosion of internal components or
electrical parts.
 Wear protective gloves when handling frozen items or cleaning the chamber.
Without gloves, you may get frostbite or get injured by the corners of interior parts.
Also, touching or inhaling chemicals or aerosols from around the unit may be detrimental to
health.

 When moving the unit, be sure to take precautions to prevent it from falling over.
Moving the unit with too much force may cause it to fall over, possibly resulting in injury. A
qualified individual must be assigned to supervise the safe movement and relocation of the unit.
 Set up or remove the shelf with both hands.
If the shelf falls down, it may cause injury.
 When using the optional inventory racks, be careful not to drop the racks.
If the rack falls down, it may cause injury or damage to the contents.


SYMBOLS ON UNIT
The following symbols are attached to the unit.
This symbol indicates possibility of an electric shock. High-voltage electrical
components are placed under the covers. Only a qualified engineer or service
personnel should be allowed to open these covers.
This symbol indicates that caution is required. Refer to product documentation for
details.
This symbol indicates incorrect usage could lead to a fire hazard.
This symbol indicates low temperature or freezing conditions.
Take care to avoid exposure to low temperature or freezing conditions.
This symbol indicates an earth.
This symbol indicates the “ON” for the power switch.
This symbol indicates the “OFF” for the power switch.

CAUTION

10
FOR SAFELY STORING SAMPLES
Ultra-low temperature freezers control temperature by mechanical systems that run on electricity. If the
systems stop due to a power failure or some other reason, the temperature in the freezer rises.
The following tips can help protect your valuable samples from unexpected failure of the freezer.
●Store valuable samples separately into multiple ultra-low temperature freezers.
●Install the backup cooling system and remote alarm system for protecting samples.
●Use the remote alarm system to ensure that the alarm notifies the administrator of the unusual status of
the freezer. Especially, the use of the remote alarm system is recommended if the freezer is placed in an
unattended environment.
●Replace the battery for backup cooling system and the battery for power failure alarm every three years.
They are consumable parts. If the battery drains, audible alarms do not sound and the backup cooling
system does not work. Contact our sales representative or agent for the replacement of the batteries.
Note:
PHC Corporation shall not be responsible for any loss or damage to the samples stored in the freezer.
About backup cooling system
When the unit stops operation in the event of a power failure, the optional backup cooling kit MDF-UB9 and
the liquid CO2cylinder can prevent the chamber temperature from rising for several hours by injecting liquid
CO2into the chamber. For details about the backup cooling system, refer to page 96.
For purchase of the backup cooling kit, contact our sales representative or agent.
Note:
The cooling function of the backup cooling system can last only several hours even if the liquid CO2cylinder
is full. Also, degradation of the battery shortens the cooling duration. The duration of time for which a full
30 kg liquid CO2cylinder can keep the chamber at -70 °C varies depending on the size of the freezer and
the volume of samples in the chamber. The following graphs show examples of the duration.
[Example] Duration of time for which a full 30 kg liquid CO2cylinder can keep the chamber at -70 °C (no load)
Notes:
●If the backup cooling system is used in a small room, or many freezers with backup cooling system are
in a same room, a large amount of CO2gas is injected or released in the room. This may cause oxygen
lack temporarily. For safety operation, install an alarm sensor and a ventilation device.
●Injecting liquid CO2into the chamber decreases pH in the chamber. Therefore, care should be taken for
the samples that may be affected.
MDF-DU503VH/VH
A
-P
A
5
10
15
20
5 1015202530
MDF-DU703VH/VH
A
-P
A
5
10
15
20
51015202530
Duration
(
h
)
Duration
(
h
)
Ambient temperature (°C)
A
mbient tem
p
erature
(
°C
)

1. BEFORE USING
11
In the event of emergency
When the audible alarm sounds or the remote alarm is activated, determine the cause of the alarm
immediately. If the temperature in the freezer has risen, take the following measures.
●Make sure to determine the cause of the temperature rise.
The alarm status continues until the temperature in the chamber falls below the temperature set to the
High Alarm temperature on the Temp. Settings screen. If the alarm status continues for more than an hour,
or the chamber temperature does not fall, the freezer may be malfunctioning. Move the samples into a
different freezer immediately and contact our sales representative or agent.
If there are no other ultra-low temperature freezers, protect your samples using the backup cooling system
or dry ice.
●In the event of a power failure, check the duration and take alternate measures to cool the samples. If
the power failure is expected to continue for several hours, protect your samples using the backup cooling
system or dry ice.
●Amount of dry ice
To keep MDF-DU503VH/VHA (inner capacity: 528 L) to -70 °C, firstly, put at least 25 kg of dry ice into the
chamber. Then, add 2.5 kg of dry ice every hour. Wrap dry ice with paper such as newspaper and put it
on each shelf equally.
To keep MDF-DU703VH/VHA (inner capacity: 729 L) to -70 °C, firstly, put at least 35 kg of dry ice into the
chamber. Then, add 3.5 kg of dry ice every hour. Wrap dry ice with paper such as newspaper and put it
on each shelf equally.
Note:
The CO2gas concentration in the chamber becomes high after the sublimation of the dry ice. The pH of the
water solution that does not includes buffer solution may become lower if it is left under such an atmosphere
for a long time.
[Example] Characteristics of chamber temperature rise during power failure (no load)
-80
-70
-60
-50
-40
-30
-20
-10
0
012345678910
502VX-PJ
702VX-PJ
Chamber tem
p
erature
(
°C
)
503VH/VHA
703VH/VHA
Elapsed time
(
h
)

12
INSTALLATION SITE
To run the freezer unit properly, the unit must be installed in a location which meets all the conditions
described below. If the location does not meet these conditions, the specified performance of the unit may
not be achieved or malfunctions and accidents may occur.
■A location not exposed to direct sunlight
Avoid any location which is exposed to direct sunlight. Installing the unit in a location exposed to direct
sunlight may degrade its cooling performance.
■A well-ventilated (airy) location
In order to ensure ventilation, leave clearances of at least 10 cm around the unit (at the left, right, top and
back). Blocking the ventilation may degrade the unit’s cooling performance or cause the unit to malfunction.
■A location away from heat sources
Avoid any location which is close to a major source of heat (such as a heater or boiler). Installing the unit
near a major source of heat may degrade the unit’s cooling performance.
■A location with minimal changes in temperature
Avoid any location where the ambient temperature is subject to sudden changes. If the unit is installed in
such a location, stable cooling performance may not be achieved. The ambient temperature for using this
product is 5 °C to 30 °C.
■A firm and level location where the floor can bear the total combined weight (product + optional
accessories + stored items)
Install the unit on a level surface which is capable of bearing the total combined weight (product + optional
accessories + stored items). If the unit is installed in a location where the floor surface is uneven or where
the unit will be inclined at an angle, the unit will be unstable, and accidents or injuries may occur and/or
unnecessary vibration or noise may be generated.
■A location with minimal humidity
Install the unit in a location where the relative humidity is 80 %R.H. or lower. Installing the unit in a very
humid location may cause earth faults and/or electric shock.
■A location free of flammable or corrosive gases
Avoid any location exposed to flammable or corrosive gases. Flammable or corrosive gases can cause
explosions and/or a fire. Furthermore, corrosion of the electrical parts may cause the insulation to be
deteriorated and result in earth faults and/or electric shock.
■A location where corrosive materials are not generated
Never install the unit in a location where corrosive materials such as sulphur compounds are likely
to be generated (e.g. near a drainage facility). Corrosion of the copper pipes may result in the
deterioration and consequently the failure of the cooling unit.
■A location where nothing can fall onto the unit
Avoid locations where objects may fall onto the unit. Objects falling and hitting the unit may cause it to
break down or fail.
Note:
Keep electric products which emit electromagnetic waves away from the unit. A noise from the
electromagnetic waves may cause the unit to malfunction.

1. BEFORE USING
13
INSTALLATION
When installing the unit, follow the steps below to secure the unit properly.
1. Preparations after unpacking
Remove all the tape used to secure the doors and interior parts, and leave the doors open for a short while
for ventilation. If any outer surfaces of the freezer are dirty, wipe the surfaces using a cloth moistened with
a diluted neutral dish-washing detergent (using an undiluted solution of detergent may cause the unit’s
plastic areas to crack. Follow the directions on the detergent for details of dilution).
After wiping the unit using the diluted detergent, be sure to wipe the surfaces with a cloth dipped in clean
water to remove traces of the detergent. After this, be sure to wipe the surfaces with a dry cloth, allowing
the outer surfaces of the freezer to dry out completely, and then proceed with the installation.
Note:
Remove the cable tie that bands the power supply cord. Prolonged contact with the tie may cause corrosion
of the cord coating.
2. Securing and leveling the unit using the leveling feet
Rotate the front leveling feet clockwise until the casters are
raised 5 mm to 10 mm above the floor surface (Fig. 1).
Then, rotate the leveling feet slightly clockwise or
anticlockwise to adjust them so that the unit is completely
level.
●The unit becomes stable with the casters not contacting the
floor. If the casters are left in contact with the floor, the unit
may accidentally move when its door is opened or closed.
3. Securing the unit using fixtures
Use the fixtures on the back panel of the unit, and secure
the unit to the wall by passing a strong rope or chain through
the fixtures (Fig. 2).
4. Preventing electric shock by earthing the unit
When installing the unit, be sure to earth (ground) it. Earthing
is necessary to prevent electric shock resulting from
deterioration of electrical insulations.
●This unit comes with a power plug having one earth pin.
Earthing work is not required in the case of a power outlet
equipped with an earth contact.
●If the power outlet is not equipped with an earth contact,
ask a qualified contractor to do the earthing work.
5. Setting up the shelves
Insert the shelf stoppers into the bores of the pilasters at the
desired level and set the shelf firmly on the shelf stoppers
(Fig. 4).
When using the optional inventory racks, insert the shelf
stoppers into the bores at the positions of the pilasters
described in “SETTING OF SHELF STOPPERS WHEN
USING INVENTORY RACKS (page 97)” and set the shelves
on the shelf stoppers.
MDF-DU503VH-PA
MDF-DU703VH-PA
MDF-DU503VHA-PA
MDF-DU703VHA-PA
Plug: NEMA 6-15PPlug: NEMA 5-15P

Receptacle: NEMA 6-15RReceptacle: NEMA 5-15R

Fig. 3
Shelf stopper
Pilaster 1. Insert the upper tab of the
shelf stopper into the bore of
the pilaster at the desired
level.
2. Put the lower notched part of
the shelf stopper into the bore
just below the position
mentioned above.
Fig. 4
Leveling feet Fig.1
Shorten
Lengthen
Fixtures Fig. 2

14
FREEZER COMPONENTS
Main body
The model below shows MDF-DU703VH/VHA (MDF-DU503VH/VHA also has an equivalent structure).
5 
7 
7
Door gasket
Key slot (→page 58)
Inner door
1

Outer door
4

6  (Inside of the grille) 
Space for temperature
recorder (option)
(→page 95)
8 
(
Inside of the outer door
)

2
3 
Fixtures (→page 13)
14 *
15
*

16 *
Remote alarm
terminal
(→page 16)
* When the optional backup cooling system is installed.

11 
12 
10 
13
LCD touch panel
(→pages 22-23)
Camera for
face recognition
9 
NFC reader
(option)
10 
Control panel
Right side
Inlet
(
MDF-DU703/503VH
A
-PA
)

1. BEFORE USING
15
1. Inner door latch: The inner door can be securely closed using this inner door latch. When closing the
inner door, make sure to engage the latch. Otherwise, the samples in the chamber may be damaged due
to the temperature changes in the chamber.
2. Outer door handle: Used for opening and closing the outer door. The latch is
provided at the bottom of the handle for securely closing the outer door. When closing
the outer door, grab the handle firmly and push it towards the cabinet side to engage
the latch. Otherwise, samples in the chamber may be damaged due to the
temperature changes in the chamber. When opening the outer door, grab the handle
firmly and pull it towards you. At the latch part, the hole for a commercially available
padlock is also provided.
3. Grille (air intake vent): The outer air is taken into the chamber from this vent. Do not block this vent. If
the vent is blocked, the cooling performance of the freezer deteriorates.
4. Leveling feet: These are screw bolts used to secure and level the unit. Adjust the height of the leveling
feet by turning them until the two front casters are away from the floor (page 13).
5. Caster: Four casters are provided to facilitate moving of the freezer. For the installation, adjust the
leveling feet so that the two front casters cannot contact the floor.
6. Condenser filter (behind the grille): Prevents the dust from accumulating on the condenser. A dusty
condenser filter may cause a failure of the freezer. Clean the condenser filter once a month (page 89).
7. Access ports (rear and bottom): Used to route the sensor/cable of measuring equipment or the nozzle
of the backup cooling system (optional) into the chamber.
Note: Be sure to put back the cap and insulation for the access ports after using the access ports. If they
are not attached properly, the chamber temperature may not reduce, or condensation may occur outside
the access ports.
8. Auto air intake port: When the outer door is closed, this port takes in the outer air and the pressure
difference between the inside and outside of the chamber is automatically adjusted. So, the outer door can
be opened easily. While this port is working, you will hear the suction noise, but this is not a malfunction.
9. Power/Alarm lamp (LED): When the power to the unit is ON, the green lamp illuminates. When the unit
is in the Alarm condition, the red lamp blinks. When the unit is in the Notice condition, the orange lamp
blinks (pages 86 - 87).
10. USB ports (at the lower part of the control panel and right side of the unit): USB flash drives are
inserted into these positions when exporting log data, user account data, or freezer setting data and when
importing user account data or freezer setting data. Also, these ports may be used for future enhancements.
If USB flash drives are inserted into both ports, the port at the lower part of the control panel has a priority.
Note: USB flash drives with a capacity of 32 GB or less that employ the FAT16/FAT32 file system are
supported. USB flash drives that require passwords cannot be used. Do not insert devices other than USB
flash drives into the USB ports.
11. Power switch: Power switch for the freezer unit (ON=“l”, OFF=“
○ ”).
12. Battery switch for power failure alarm: Switch for turning ON/OFF the battery for power failure alarm.
Always turn this switch on when the unit is operating to ensure that the power failure alarm is working. Turn
this switch off when the unit is not used for a long period in order to protect the battery.
13. Power supply cord: MDF-DU703/503VH-PA (undetachable), MDF-DU703/503VHA-PA (detachable)
Do not disconnect the power supply plug or the product side plug (inlet part) carelessly. If the power supply
cord is disconnected, the contents of the chamber may be deteriorated.
* When the optional backup cooling system is installed:
14. Backup test switch (TEST)*: Used to check that the backup cooling system can inject liquid CO2(page
96).
15. Backup power switch (BACKUP)*: Power switch for the backup cooling system (page 96).
16. Temperature setting knob (TEMP. SET)*: Used to set the injection start temperature of the backup
cooling system (page 96).
Padlock position [Fig. 1]

16
FREEZER COMPONENTS
Accessories
Check that following accessories are included with this unit. If any accessories are missing, contact our
sales representative or agent.
Name Qty Appearance Usage
Key 1 set
For opening the outer door manually in the
event of a power failure (page 58).
Scraper 1 For removing frost in the chamber (page 90).
Shelf stopper 12
For securing the shelves in the chamber
(page 13).
Remote alarm terminals
The alarm condition of the freezer can be transferred to a remote location by connecting an external alarm
device (commercially available) to the remote alarm terminals. Especially, the use of the remote alarm
device is recommended if the freezer is placed in an unattended environment to ensure that alarm condition
is notified to the administrator. For installing the alarm device, contact our sales representative or agent.
The terminals for the remote alarm are provided at the right side
of the unit (see the right figure). Alarm signals are transmitted
from these terminals as non-voltage contact outputs. Contact
capacity is DC 30 V, 2 A.
Table 1 shows the terminal status and the behavior of the remote
alarm when the Buzzer Stop button is tapped.
Note:
●For the door alarm, remote alarm function does not activate
(page 86).
Table 1 Terminal status and behavior of remote alarm when Buzzer Stop button is tapped
“Remote Alarm” setting
(page 61)
Connection
terminal
Normal
condition
A
bnormal condition
(Including in the event of power outage and
when power plug is pulled out.)
When Buzzer Stop button is tapped
ON:
Not linked with Buzzer Stop button
COM.-N.C. Close Open Open (indicates abnormal condition)
COM.-N.O. Open Close Close (indicates abnormal condition)
OFF:
Linked with Buzzer Stop button
COM.-N.C. Close Open Close (goes back to normal condition)
COM.-N.O. Open Close Open (goes back to normal condition)
Notes:
●For the types of alarms that can be transferred to the remote alarm device, refer to pages 86 and 87.
●Use a commercially available alarm device when using the remote alarm function. Making a new device
or remaking an existing device yourself may cause an electric shock or malfunction.
●When connecting an alarm device to the remote alarm terminals, turn off the power switch and unplug
the freezer. Otherwise, it may cause an electric shock.
●Use shielded wire for connection. A maximum length of 30 meters of the cable is recommended.
719
719
Remote alarm terminals

1. BEFORE USING
17
START-UP PROCEDURE
Follow the procedure below to start test run or start operation of this product.
1. Check that the following switches at the lower right side of the
unit are turned off: power switch, battery switch for power failure
alarm, backup power switch (if the optional backup cooling system is
installed).
Note: Power failure alarm will activate if the battery switch for power
failure alarm is turned on when the power to the freezer is off.
2. Without putting anything into the chamber, connect the power
supply cord to the dedicated outlet.
3. Turn on the power switch for the unit to start freezer operation.
4. Turn on the battery switch for power failure alarm.
Note: When the battery switch for power failure alarm is OFF, the freezer is in the notice status. For
details about the notice status, refer to the N22 description on page 87. The status returns to normal
when the battery switch for power failure alarm is turned on.
5. Set the desired chamber temperature set point and high and low temperature alarms (page 59).
Note: Keep the ambient temperature 5°C to 30 °C. The chamber temperature may not reach to the
set point if the ambient temperature exceeds 30 °C.
6. Check that the chamber temperature has cooled to the set point by looking the temperature
displayed on the Home screen.
7. Perform the alarm test. Check that the alarm activates properly by following the instruction about alarm
test on page 61.
8. Turn on the backup power switch for the optional backup cooling system (if installed).
Note: When backup power switch is off, the backup cooling icon is displayed in orange. This icon
turns white when the backup power switch is turned on (page 96).
9. Press the backup test switch for the optional backup cooling system (if installed) to check if it
works properly (you can hear a slight injection sound).
Note: If the backup cooling system is not charged enough when this product is turned on for the first
time or this product is not used for a long time, the backup cooing kit may not work properly. In this
case, charge the backup cooling system by running the freezer for more than 6 hours. For fully charging
the completely discharged backup cooling system, the freezer should run more than three days.
10. Set the injection start temperature of the backup cooling system (if installed) using the
temperature setting knob (TEMP.SET).
11. Put the samples into the chamber little by little.
♦Putting a large volume of samples into the chamber at a time causes the temperature to rise rapidly.
♦Putting too many high temperature items into the chamber may rise the chamber temperature
causing the samples to deteriorate.
12. Configure settings (alarm setting, security mode, etc.) as necessary.
Notes:
●When closing the outer door, push the handle towards the cabinet side until the latch is engaged.
Insufficient pushing can cause temperature rise in the chamber.
●In case some optional inventory racks are in the chamber, be careful not to drop inventory rack when
pulling it out.
PreparationStart-upSetting after start-up
Check
Setting optional device function
Lower ri
g
ht side of the unit
Backup power switch
*
Battery switch for
power failure alarm
Power switch
*When backup cooling system is installed.

18
START-UP PROCEDURE
Operation during power failure
When the battery switch for power failure alarm is ON, the unit behaves as follows even during a power
failure.
●The power failure alarm activates (page 86).*
Tap the Buzzer Stop button to silence the sound of the power failure alarm. If the ring back is turned ON, the
audible alarm sounds again when a power failure still continues after ring back set time elapsed (page 60).
●The power/alarm lamp (LED) blinks in red.*
●LCD touch panel becomes dark.
By touching the LCD touch panel, it becomes brighter for 5 seconds.*
●The High/Low alarm can activate even during a power failure (pages 59 and 86).
When High/Low alarm activates, an alarm message is displayed on the message display area. At this
point, the audible alarm and the remote alarm have activated, and the status indicator and the power/alarm
lamp has been turned red since the power failure alarm has already activated.
●The clock does not stop.
●Event log data and operation log data during a power failure is saved.*
*When the battery is flat, these functions do not work.
Operation after recovery from power failure
During a power failure, the setting values are stored in the nonvolatile memory. Therefore, after the power
comes back, the freezer resumes the operation using the setting values before the power failure.
Reconfiguration for setting values is not required but check the settings such as operation settings and
alarm settings. If the settings have been changed for some reasons, stored items inside the unit may be
adversely affected after the operation resumes.
In order to notify the user that a power failure has
occurred, the alarm status continues even if the freezer
resumes its operation after the power failure. That is, the
audible alarm sounds, the status indicator blinks in
orange, and “Buzzer Stop” is displayed in the center of the
Buzzer Stop button. Tapping the Buzzer Stop button
stops the sound and clears the “Buzzer Stop” indication.
Also, the event log button in the sidebar menu indicates
that there is information that the user should
acknowledge . To check the power failure log, tap the
event log button (page 72).
Notes:
●In case of power failure, take appropriate measures to protect the valuable samples following the tips
described on pages 10 and 11.
●It may take up to 1 minute until the LCD touch panel turns on after the power comes back.
●If multiple freezers are used, all of the freezers will start up at the same time after the power comes back.
This will lead to a temporary voltage drop and may affect the starting of the freezers. To prevent this
situation, set the appropriate compressor delay time for the freezers (page 61).

2. TOUCH PANEL OPERATION
19
2. TOUCH PANEL OPERATION
USING THE TOUCH PANEL
For controlling the freezer, the LCD touch panel is provided at the front of the freezer.
Basic Operation
Notes:
●Use your finger or a capacitive stylus pen to protect the screen.
●Do not use sharp pointed hard items such as the tip of a ballpoint pen for touching the screen.
Entering alphanumeric values and dates
Entering numerical values:
1. Tap the numeric input field.
►The numeric input window is displayed.
2. Tap the numeric keys or Up/Down keys to input a numerical value.
Details of keys in the numeric input window
• Numeric keys (0~9): Input numbers directly.
• Up/Down keys (▲/▼): Increase or decrease the numerical value
displayed in the numeric input field.
• Clear button: Deletes the numerical value displayed on the numeric
input box.
3. Tap the OK button.
Tap
Lightly touch the screen with your
finger and immediately release the
finger from the screen.
Slide
With lightly touching the screen with
your finger, move to the destination
and then release the finger from the
screen.

Long tap
Lightly touch the screen for a few
seconds and then release the finger
from the screen.


Numeric
input fields
Clear button Up/Down keys
Numeric keys

20
USING THE TOUCH PANEL
Entering alphanumeric characters and symbols:
1. Tap the alphanumeric input field.
►The alphanumeric input window is displayed.
2. Tap the alphabetic keys, numeric keys, or symbol keys to
enter alphanumeric characters and symbols.
►The input windows can be switched using the button.
The screen switches in the order of the uppercase
letters/numbers window →lowercase letters/numbers
window →symbols window.
Details of keys in the alphanumeric input window
• Alphabetic keys (A to Z, a to z, Space): Input alphabetic
characters or spaces.
• Numeric keys (0 to 9): Input numbers.
• Symbol keys: Input symbols
• Left/Right buttons (◄/►): Move the cursor to the left/right.
• Delete button: Deletes an alphanumeric character or symbol
immediately to the left of the cursor.
3. Tap the OK button.
Entering date and time:
1. Tap the date input field or time input field.
►The input window is displayed.
[Uppercase letters, numbers]
[Lowercase letters, numbers]
[Symbols]
Date input field
Time input field
Alphanumeric input field