Phcbi MDF-137 Series User manual

MDF-137 
MDF-237
MDF-437Series
Please read the operating instructions carefully before using this product, and keep the operating
instructions for future use.
See page 33 for all model numbers.
Operating Instructions
Biomedical Freezer
MDF-437

1
CONTENTS
INTRODUCTION P. 2
PRECAUTIONS FOR SAFE OPERATION P. 3
ENVIRONMENTAL CONDITIONS P. 7
LABELS ON UNIT P. 7
SYMBOLS ON UNIT P. 7
FREEZER COMPONENTS P. 8
Control panel P.10
INSTALLATION SITE P.11
INSTALLATION P.12
START-UP OF UNIT P.13
REMOTE ALARM TERMINAL P.13
CHAMBER TEMPERATURE SETTING P.14
KEY LOCK FUNCTION P.14
ALARM TEMPERATURE SETTING P.15
SETTING OF ALARM RESUME TIME P.16
CHANGE OF COMPRESSOR DELAY TIME P.17
ALARMS & SAFETY FUNCTIONS P.18
ROUTINE MAINTENANCE P.19
Cleaning of cabinet P.19
Defrosting P.19
TROUBLESHOOTING P. 20
DISPOSAL OF UNIT P. 21
Recycle of battery P. 21
Decontamination of unit P. 21
DISPOSAL OF BATTERY P. 26
TEMPERATURE RECORDER (OPTION) P. 27
Installation of MTR-4015LH and MTR-G85C P. 27
Setting of MTR-4015LH P. 27
Setting of MTR-G85C P. 29
INTERFACE BOARD (OPTION) P. 31
SPECIFICATIONS P. 32
PERFORMANCE P. 33
SAFETY CHECK SHEET P. 34

2
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 lost 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.
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.

3
PRECAUTIONS FOR SAFE OPERATION
It is imperative that the user complies with the operating instructions
as it contains important safety advice.
Items and procedures are described so that you can use this unit correctly and safely.
If the precautions advised are followed, this will prevent possible injury to the user and
any other person.
Precautions are illustrated in the following way:
WARNING
Failure to observe WARNING signs could result in a hazard to personnel
possibly resulting in serious injury or death.
CAUTION
Failure to observe CAUTION signs could result in injury to personnel and
damage to the unit and associated property.
Symbol shows;
This symbol means caution.
This symbol means an action is prohibited.
This symbol means an instruction must be followed.
Be sure to keep the operating instructions in a place accessible to users of this unit.
< Label on the unit >
This mark is labeled on the cover in which the electrical components of high voltage
are enclosed to prevent the electric shock.
The cover should be removed by a qualified engineer or service personnel only.

4
PRECAUTIONS FOR SAFE OPERATION
Do not use the unit outdoors. Current leakage or electric shock may result if the unit is exposed to
rain water.
Only qualified engineers or service personnel should install the unit. The installation by
unqualified personnel may cause electric shock or fire.
Install the unit on a sturdy floor and take an adequate precaution to prevent the unit from
turning over. If the floor is not strong enough or the installation site is not adequate, this may result
in injury from the unit falling or tipping over.
Never install the unit in a humid place or a place where it is likely to be splashed by water.
Deterioration of the insulation may result which could cause current leakage or electric shock.
Never install the unit in a flammable or volatile location. This may cause explosion or fire.
Never install the unit where acid or corrosive gases are present as current leakage or electric
shock may result due to corrosion.
Always ground (earth) the unit to prevent electric shock. If the power supply outlet is not
grounded, it will be necessary to install a ground by qualified engineers.
Never ground the unit through a gas pipe, water main, telephone line or lightning rod. Such
grounding may cause electric shock in the case of an incomplete circuit.
Connect the unit to a 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 fire or electric shock.
Never store volatile or flammable substances in this unit if the container cannot be sealed. These
may cause explosion or fire.
Do not insert metal objects such as a pin or a wire into any vent, gap or any outlet on the unit.
This may cause electric shock or injury by accidental contact with moving parts.
Use this unit in safe area when treating the poison, harmful or radiate articles. Improper use
may cause bad effect on your health or environment.
Turn off the power switch (if provided) and disconnect the power supply to the unit prior to
any repair or maintenance of the unit in order to prevent electric shock or injury.
Do not touch any electrical parts (such as power supply plug) or operate switches with a wet
hand. This may cause electric shock.
WARNING

5
PRECAUTIONS FOR SAFE OPERATION
Ensure you do not inhale or consume medication or aerosols from around the unit at the time of
maintenance. These may be harmful to your health.
Never splash water directly onto the unit as this may cause electric shock or short circuit.
Never put containers with liquid on the unit as this may cause electric shock or short circuit when
the liquid is spilled.
Never bind, process, or step on the power supply cord, or never damage or break the power
supply plug. A broken supply cord or plug may cause fire or electric shock.
Do not use the power supply cord if its power supply plug is loose. Such power supply cord
may cause fire or electric shock.
Never disassemble, repair, or modify the unit yourself. Any such work carried out by an
unauthorized person may result in fire, or electric shock or injury due to a malfunction.
Disconnect the power supply plug if there is something wrong with the unit. Continued
abnormal operation may cause electric shock or fire.
When removing the power supply plug from the power supply outlet, grip the power supply
plug, not the cord. Pulling the cord may result in electric shock or fire by short circuit.
Disconnect the power supply plug before moving the unit. Take care not to damage the power
supply cord. A damaged cord may cause electric shock or fire.
Disconnect the power supply plug when the unit is not used for long periods. Keeping the
connection may cause electric shock, current leakage, or fire due to the deterioration of insulation.
If the unit is to be stored unused in an unsupervised area for an extended period, ensure that
children do not have access and that door cannot be closed completely with a key.
The disposal of the unit should be accomplished by appropriate personnel. Remove door to
prevent accidents such as suffocation.
Do not put the packing plastic bag within reach of children as suffocation may result.
Do not position this unit and the other unit so that it is difficult to operate the disconnection of
the power supply plug. Failure to disconnect the power supply plug may cause fire if there is
something wrong with the unit.
WARNING

6
PRECAUTIONS FOR SAFE OPERATION
This unit must be plugged into a dedicated circuit protected by branch circuit breaker.
Use a dedicated power source as indicated on the rating label attached to the unit. A multiple-tap
may cause fire resulting from abnormal heating.
Never store corrosive substances such as acid or alkali in this unit if the container cannot be
sealed. These may cause corrosion of inner components or electric parts.
Check the setting when starting up of operation after power failure or turning off of power
switch. The stored items may be damaged due to the change of setting.
Be careful not to tip over the unit during movement to prevent damage or injury.
Prepare a safety check sheet when you request any repair or maintenance for the safety of service
personnel.
CAUTION

7
ENVIRONMENTAL CONDITIONS
This equipment is designed to be safe at least under the following conditions (based on the IEC
61010-1):
■Indoor use;
■Altitude up to 2000 m;
■Temperature 5 oC to 40 oC
■Maximum relative humidity 80% for temperature up to 31 oC decreasing linearly to 50% relative
humidity at 40 oC;
■Mains supply voltage fluctuations up to ±10% of the nominal voltage;
■Transient overvoltages up to the levels of OVERVOLTAGE CATEGORY II;
■Temporary OVERVOLTAGES occurring on the mains supply;
■Applicable pollution degree of the intended environment (POLLUTION DEGREE 2 in most cases);
LABELS ON UNIT
Warning safety labels applied to the biomedical freezer
Users are advised to avoid accidents by carefully reading the warnings and cautions contained on
warning labels at key locations on the interior and exterior of the biomedical freezer.
Possible
Danger
Warning/Caution Type
Location of Danger
Warning/Caution Label Description of Danger
Personal
injury
Hazardous Latch
Exterior
When closing the door, take care
not to get caught your hand in the
latch, or may result in injury.
SYMBOLS ON UNIT
The symbols are attached to the ultra-low temperature freezer. The following table describes the
symbols.
This symbol is attached to covers that access high-voltage electrical components to
prevent electric shock. 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 a hot surface.

8
FREEZER COMPONENTS
11
10
MDF-137
21
4
3
9
7
8
5
Latch
12
13
14
Power supply cord
6
11
10
15
MDF-437

9
FREEZER COMPONENTS
1. Door: To open the door, grip the handle.
2. Handle: Always grip this handle to open and close the door.
3. Lock: Turn counterclockwise to 180owith a key and the door is securely locked.
4. Access port: This is used for leading the measuring cable from the chamber to the outside.
5. Drain port: The water accumulated on the bottom of the chamber can be drained through this port.
6. Caster: 4 casters are provided to facilitate moving of the cabinet. At the time of installation, make
sure that the 2 front casters are not contact with the floor, by adjusting the leveling feet.
7. Leveling foot: 2 leveling feet are provided on the front side (right and left). Keep the unit in level by
adjusting these feet at the installation.
8. Space for temperature recorder: A temperature recorder (optional component) can be attached
here. See page 27 “Temperature recorder (OPTION)”.
9. Control panel: To display the temperature setting and running condition. See page 10 for the
details.
10. Door gasket: This provides a tight door seal and prevents cold air leak. Keep clean.
11. Basket: Used for storing the materials in the chamber.
12. Remote alarm terminal (on back side): This is used to notice an alarm condition of the unit to
remote location. Refer to page 13 “Remote alarm terminal”.
13. Battery switch: This is a switch of the battery for power failure alarm. Always set the switch in ON
position. Be sure to turn off this switch to save the battery if the freezer is not in operating for the long
period (more than 1 month).
14. Power switch: This is for turning ON/OFF the power to the unit. ON – “I” OFF – “○”. This has
a function as an over-current protection breaker (15 A).
15. Inner lid: Serves as a means of reducing cold air leakage when the door is open. Remove the
frost regularly. (MDF-437 only)

10
FREEZER COMPONENTS
Control panel
1. Alarm lamp (ALARM): This lamp is flashed when unit is in alarm status. See page 18.
2. Digital temperature indicator: Normally, the current chamber temperature is displayed. In alarm
status, an error code and chamber temperature is displayed alternately. See page 18.
3. Numerical value shift key ( ): Pressing this key in the set mode causes the numerical value to
shift. ON-OFF of key lock can be selected by pressing this key in the key lock setting mode.
4. Digit shift key ( ): Pressing this key in the set mode causes the changeable digit to shift. Key
lock setting mode is led by pressing this key for more than 5 seconds in the temperature display mode.
Refer to page 14 for the key lock.
5. Set key (SET): Temperature setting mode is led by pressing this key. Once the key is pressed, the
changeable digit is flashed. Pressing this key again after setting desired temperature, the setting is
stored into computer memory.
6. Defrost key (DEF): When removing the frost, press this key for 5 seconds. The freezer operation is
stopped. After removing the frost, press this key again. The freezer operation is resumed. See page
19 for details.
Note: The freezing operation never resumes automatically after defrosting.
7. Buzzer stop key (BUZZER): Buzzer stop key. Should a further abnormality occur, the buzzer will
sound automatically.
8. Alarm test key (ALARM TEST): Test key for alarm device. By pressing this key, the alarm lamp is
flashed, remote alarm is activated and buzzer sound. This means all alarm function operate correctly.
This key is available only during normal running.
8 7 6 5 4 3
1 2

11
INSTALLATION SITE
To operate this unit properly and to obtain maximum performance, install the unit in a location with the
following conditions:
■A location not subjected to direct sunlight
Do not install the unit under direct sunlight. Installation in a location subjected to direct sunlight cannot
obtain the intended performance.
■A location with adequate ventilation
Leave at least 10 cm around the unit for ventilation. Poor ventilation will result in a reduction of the
performance and consequently the failure.
■A location away from heat generating sources
Avoid installing the unit near heat-emitting appliances such as a heater or a boiler etc. Heat can
decrease the intended performance of the unit.
■A location with little temperature change
Install the unit under stable ambient temperature. The allowable ambient temperature is between 5 oC
and 35 oC.
■A location with a sturdy and level floor
Always install the unit on a sturdy and level floor. The uneven floor or tilted installation may cause
failure or injury. Install the unit in stable condition to avoid the vibration or noise. Unstable condition
may cause vibration or noise.
WARNING
Install the unit on a sturdy floor. If the floor is not strong enough or the installation site is not
adequate, this may result in injury from the unit falling or tipping over.
Select a level and sturdy floor for installation. This precaution will prevent the unit from tipping.
Improper installation may result in water spillage or injury from the unit tipping over.
■A location not prone to high humidity
Install the unit in the ambient of 80%R.H. or less humidity. Installation under high humidity may cause
current leakage or electric shock.
WARNING
Do not use the unit outdoors. Current leakage or electric shock may result if the unit is exposed to
rain water.
Never install the unit in a humid place or a place where it is likely to be splashed by water.
Deterioration of the insulation may result which could cause current leakage or electric shock.
■A location without flammable or corrosive gas
Never install the unit in a location where it will be exposed to flammable or corrosive gas. This may
cause explosion or fire or may result in the current leakage or electric shock by the corrosion of the
electrical components.
■A location without the possibility of anything fall
Avoid installing the unit in the location where anything can fall down onto the unit. This may cause the
breakdown or failure of the unit.

12
INSTALLATION
1. Removing the packaging materials and tapes
Remove all transportation packaging materials and tapes. Open the door and ventilate the unit. If the
outside panels are dirty, clean them with a diluted neutral dishwashing detergent. (Undiluted detergent
can damage the plastic components. For the dilution, refer to the instruction of the detergent.) After
the cleaning with the diluted detergent, always wipe it off with a wet cloth. Then wipe off the panels with
a dry cloth.
Note:
Remove the cable tie banding the power supply cord.
Prolonged banding may cause the corrosion of the
cord coating.
2. Adjust the leveling foot
Stretch the leveling feet by rotating them to
contact them to the floor as shown in the figure.
Ensure the unit is installed horizontally.
3. Ground (earth)
The ground (earth) is for preventing the electric shock in the case of unexpected deterioration of the
electrical insulation. Always ground the unit at the time of installation.
WARNING
Use a power supply outlet with ground (earth) to prevent electric shock. If the power supply outlet is
not grounded, it is necessary to install a ground by qualified engineers.
Never ground the unit through a gas pipe, water main, telephone line or lightning rod. Such
grounding may cause electric shock in the case of an incomplete circuit.
Leveling foot

13
START-UP OF UNIT
Use the following procedure to start trial operation or actual operation of the unit.
1. Turn the power switch ON with the chamber empty.
2. Turn ON the battery switch.
3. Set the chamber temperature to a desired value.
4. Allow the unit to achieve the desired chamber temperature.
5. Check that the alarm lamp is flashed and the buzzer is activated by pressing alarm test key (ALARM
TEST). The remote alarm is also operated. E09 is displayed on the control panel if the battery switch
is OFF.
6. Now you can put articles into the chamber gradually to minimize the temperature rise.
Note:
■When starting the operation of the freezer for the first time, the alarm lamp (ALARM) is flashed. When
the chamber temperature reaches around the set temperature, then the alarm lamp goes out (The remote
alarm is not activated).
■If the battery switch is turned ON before turning ON the power of the freezer, the power failure alarm is
activated and the buzzer sounds and the remote alarm is also activated after the start of operation.
Check that the battery switch is OFF before turning ON the freezer.
Operation after power failure
The set value is memorized by nonvolatile memory. Accordingly, the freezer resumes the operation with
setting before power failure.
When the freezer is recovered from power failure with the chamber temperature higher than the preset
temperature, then the high temperature alarm is activated and the buzzer sounds and the remote alarm is
also activated.
REMOTE ALARM TERMINAL
WARNING
Always disconnect the power supply cord before connecting an alarm device to the remote alarm
terminal.
The terminal of the remote alarm is installed at the back of the unit. The alarm is outputted from this
terminal. Contact capacity is DC 30 V, 2 A.
Contact output:
between COM. and N.O. between COM. and N.C.
At normal Open Close
At abnormal Close Open
Note:
■The buzzer is silenced by pressing buzzer stop key
(BUZZER) on the control panel during alarm condition.
(A remote alarm is continuing the operation.)
The buzzer will be activated again after certain
suspension if the alarm condition is continued.
■The alarm is actuated when the power supply cord is
disconnected from the outlet or the power switch is OFF.
(The remote alarm is also operated.)
Terminal
N.C. COM N.O.
MAX DC30V 2A

14
CHAMBER TEMPERATURE SETTING
Table 1 shows the basic procedure for setting the chamber temperature. Perform key operations in the
sequence indicated in the table. The example in the table is based on the assumption that the desired
temperature is -25 oC.
Note: The chamber temperature is set to -30oC at the factory.
Table 1. Basic operation sequence (Example: Chamber temperature -25
oC)
Description of operation Key operated Indication after operation
1 Switch on the freezer. ---- The current chamber temperature is
displayed.
2 Press set key. SET The current setting is displayed and
the second digit is flashed.
3
Set the temperature to -25 with the
digit shift key and the numerical
value shift key.
When pressed, the figure of settable
digit changes.
When pressed, the changeable digit
is shifted.
4 Press set key. SET
Set temperature is memorized and the
current chamber temperature is
displayed.
■The set mode returns to the temperature display mode automatically when 90 seconds has passed
without any key operation. In this case, any setting before pressing set key (SET) is not memorized.
■Although the value of the chamber temperature setting can range between -18 oC and -35 oC, the
guaranteed temperature without load is -30 oC at ambient temperature of 35 oC.
KEY LOCK FUNCTION
This unit is provided with the key lock function. When the key lock is ON, change of temperature setting
through the key pad is not available. The key lock is set in OFF at the factory.
Display Mode Function
L 0 Key lock is OFF Enable to change of temperature setting
L 1 Key lock is ON Disable to change of temperature setting
Table 2. Procedure for key lock setting (change from key lock OFF to key lock ON)
Description of operation Key operated Indication after operation
1 ---- The current chamber temperature is
displayed.
2 Press digit shift key for 5 seconds. The current setting is displayed and
the first digit is flashed.
3 Press numerical value shift key and
scroll the figure to 1. When pressed, the figure of settable
digit changes.
4 Press set key. SET
The key lock is set to ON.
The current chamber temperature is
displayed.
■The set mode returns to the temperature display mode automatically when 90 seconds has passed
without any key operation. In this case, any setting before pressing set key (SET) is not memorized.

15
ALARM TEMPERATURE SETTING
This unit is provided with both high and low temperature alarms. The temperature at which the alarm is
activated may be changed.
The available set range for high temperature alarm is between +5 oC and +15 oC, and -5 oC and -15 oC
for low temperature alarm against the chamber temperature.
Note: The temperature alarm is set at ±10 oC of the set temperature at the factory.
Display Mode Set range
F01 High temperature alarm set between 5 oC and 15 oC higher than the chamber set temperature
F02 Low temperature alarm set between 5 oC and 15 oC lower than the chamber set temperature
As an example, Table 3 shows the procedure to set the high temperature alarm so that the alarm can
activate when the chamber temperature is 5 oC higher than the set temperature.
Table 4 shows the procedure to set the low temperature alarm so that the alarm can activate when the
chamber temperature is 5 oC lower than the set temperature.
Table 3. Procedure for setting high temperature alarm (change from 10 oC to 5 oC)
Description of operation Key operated Indication after operation
1 ---- The current chamber temperature is
displayed.
2 Press numerical value shift key for
about 5 seconds. F00 is displayed and the first digit is
flashed.
3 Press numerical value shift key and
scroll the figure to 1. When pressed, the figure of settable
digit changes.
4 Press set key. SET The current setting is displayed and
the first digit is flashed.
5
Scroll the figure to 005 by using
digit shift key and numerical value
shift key.
When pressed, the changeable digit
is shifted.
When pressed, the figure of settable
digit changes.
6 Press set key. SET
Alarm temperature is memorized and
the current chamber temperature is
displayed.
Table 4. Procedure for setting low temperature alarm (change from -10 oC to -5 oC)
Description of operation Key operated Indication after operation
1 ---- The current chamber temperature is
displayed.
2 Press numerical value shift key for
about 5 seconds. F00 is displayed and the first digit is
flashed.
3 Press numerical value shift key and
scroll the figure to 2. When pressed, the figure of settable
digit changes.
4 Press set key. SET The current setting is displayed and
the first digit is flashed.
5
Scroll the figure to -05 by using
digit shift key and numerical value
shift key.
When pressed, the changeable digit
is shifted.
When pressed, the figure of settable
digit changes.
6 Press set key. SET
Alarm temperature is memorized and
the current chamber temperature is
displayed.
■The set mode returns to the temperature display mode automatically when 90 seconds has passed
without any key operation. In this case, any setting before pressing set key (SET) is not memorized.

16
SETTING OF ALARM RESUME TIME
The alarm buzzer is silenced by pressing alarm buzzer stop key (BUZZER) on the control panel during
alarm condition.
However, if the alarm condition is continued after the “alarm resume time” has passed, the buzzer sounds
again.
It is possible to change the alarm resume time by the procedure shown in the Table.5.
Note: Factory setting; 30.
Table 5. Setting procedure for alarm resume time (change from 30 minutes to 20 minutes)
Description of operation Key operated Indication after operation
1 ---- The current chamber temperature is
displayed.
2 Press numerical value shift key for
about 5 seconds. F00 is displayed and the first digit is flashed.
3
Set the figure to F25 with the digit
shift key and numerical value shift
key.
When pressed, the changeable digit
is shifted.
When pressed, the figure of settable
digit changes.
4 Press set key. SET The current setting is displayed and
the second digit is flashed.
5 Scroll the figure to 020 with the
numerical value shift key. When pressed, the figure of settable digit changes.
6 Press set key. SET
Alarm resume time is memorized and
the current chamber temperature is
displayed.
■The set mode returns to the temperature display mode automatically when 90 seconds has passed
without any key operation. In this case, any setting before pressing set key (SET) is not memorized.
■The settable alarm resume time are 10, 20, 30, 40, 50, or 60 minutes. The buzzer would not resume if
the resume time is set in 000.

17
CHANGE OF COMPRESSOR DELAY TIME
The compressor delay time can be changed to reduce the load on the power line and to facilitate the
start-up (resume) of the freezer after power failure.
The example in the table is based on the assumption that the delay time is changed to 4 minutes.
(The delay time is set in 3 minutes at the factory.)
Note:
■The set range for delay time is between 3 and 15 minutes. The cool down of chamber temperature
may be slow when the setting of delay time is over 5 minutes, depending on the installation environment.
There is no need of changing the delay time when the capacity of power source is adequate.
Table 6. Changing procedure for delay time (change from 3 minutes to 4 minutes)
Description of operation Key operated Indication after operation
1 ---- The current chamber temperature is
displayed.
2 Press numerical value shift key for
about 5 seconds.
F00 is displayed and the first digit is
flashed.
3 Set the figure to F05 with the
numerical value shift key. When pressed, the figure of settable
digit changes.
4 Press set key. SET The current setting is displayed and
the first digit is flashed.
5 Set the figure to 004 with the
numerical value shift key. When pressed, the figure of settable digit changes.
6 Press set key. SET
The delay time is memorized and
the current chamber temperature is
displayed.
■The set mode returns to the temperature display mode automatically when 90 seconds has passed
without any key operation. In this case, any setting before pressing set key (SET) is not memorized.
■The compressor starts to run with the delay time when the power supply cord is connected to the outlet,
the power switch is turned on or after power failure.

18
ALARMS & SAFETY FUNCTIONS
This unit has the alarms and safety functions and also self diagnostic functions shown in Table 7.
Table 7. Alarms, safety functions and self diagnostic functions
Alarm Situation Indication Buzzer Safety operation
High temperature
alarm
If the chamber temperature is higher
than the temperature at which the
high temperature alarm is activated.
Alarm lamp is flashed.
Digital temperature
indicator is flashed.
Intermittent tone with
15 minutes delay.
Remote alarm with 15
minutes delay.
Low temperature
alarm
If the chamber temperature is lower
than the temperature at which the
low temperature alarm is activated.
Alarm lamp is flashed.
Digital temperature
indicator is flashed.
Intermittent tone with
15 minutes delay.
Remote alarm with 15
minutes delay.
Power failure alarm
In the case of power failure.
When power switch is turned OFF.
When the power to the unit is
disconnected.
Alarm lamp is flashed. Intermittent tone Remote alarm.
Auto-return When there is no key pressing in
each setting mode for 90 seconds.
Chamber temperature is
displayed. ----- Finishing of each
set mode.
Key lock When the key lock is “ON”. ----- ----- Change of setting is
disable.
Thermal sensor
abnormality
If the thermal sensor is disconnected.
Alarm lamp is flashed.
E01 and chamber temp.
are displayed alternately.
Intermittent tone Remote alarm.
Continuous operation.
If the thermal sensor is short-circuited.
Alarm lamp is flashed.
E02 and chamber temp.
are displayed alternately.
Intermittent tone Remote alarm.
Continuous operation.
Protective sensor
for compressor
abnormality
(MDF-437 only)
If the protective sensor for compressor
is disconnected.
Alarm lamp is flashed.
E05 and chamber temp.
are displayed alternately.
Intermittent tone Remote alarm.
Normal operation.
If the protective sensor for compressor
is short-circuited.
Alarm lamp is flashed.
E06 and chamber temp.
are displayed alternately.
Intermittent tone Remote alarm.
Normal operation.
Battery switch
check
When the battery switch is OFF at the
time of alarm test. E09 is displayed. Intermittent tone Remote alarm.
Compressor temp.
abnormality
(MDF-437 only)
In the case of failure of compressor
cooling fan motor.
If the temperature goes up abnormally
by the accumulation of dust on the
condenser
In the case of abnormal high ambient
temperature.
Alarm lamp is flashed.
E10 and chamber temp.
are displayed alternately.
Intermittent tone Remote alarm.
Compressor stops.
Battery check
When about 3 years have passed
with the power supply cord connected
to the outlet.
(time to replace the battery)
F-1 and chamber temp. is
displayed alternately. ----- -----
Fan motor check
(MDF-437 only)
When about 6 years have passed
with the power supply cord connected
to the outlet.
(time to replace the fan motor)
F-2 and chamber temp. is
displayed alternately. ----- -----
Note:
■The above power failure alarm is available when the battery switch is ON and the battery is charged.
If the battery switch is OFF or the battery is discharged, only the remote alarm is activated.
■The power failure alarm can be kept about 12 hours with the battery charged completely. 2-day
operation of the freezer is needed to charge the battery full.
■The chamber temperature is displayed for 5 seconds if the alarm buzzer stop key (BUZZER) is
depressed during the power failure alarm. After that, the alarm buzzer stops.
■The remote alarm is not silenced by pressing alarm buzzer stop key (BUZZER).
■At the recovery from power failure, the operation is resumed with the condition before power failure
since the temperature setting and alarm temperature setting are memorized in a nonvolatile memory.
■The battery for power failure alarm is an article for consumption. It is recommended that the battery
will be replaced about every 3 years. Contact our sales representative or agent at the time of
replacement of the battery.
■Fan motor is an expendable supplies (MDF-437 only). Replace the fan motor about every 6 years.
Contact our sales representative or agent at the time of replacement of the fan motor.