Sanyo MDF-394, MDF-394AT Instruction Manual

MDF-394
MDF-394

A

T

Ultra-Low Temperature Freezer

INSTRUCTION MANUAL

MDF-394AT

1

CONTENTS

INTRODUCTION P. 2

PRECAUTIONS FOR SAFE OPERATION P. 3

ENVIRONMENTAL CONDITIONS P. 7

FREEZER COMPONENTS P. 8

Control panel P. 10

INSTALLATION SITE P. 11

INSTALLATION P. 12

START-UP OF UNIT P. 13

CHAMBER TEMPERATURE SETTING P. 14
KEY LOCK FUNCTION P. 14

ALARM TEMPERATURE SETTING P. 15

SETTING OF ALARM RESUME TIME P. 16

REMOTE ALARM TERMINAL P. 17

ALARMS & SAFETY FUNCTIONS P. 18

ROUTINE MAINTENANCE

Cleaning of cabinet P. 19

Cleaning of condenser filter P. 19

Defrosting of inside wall P. 19

TROUBLESHOOTING P. 20

REPLACEMENT OF BATTERY P. 21

DISPOSAL OF UNIT P. 22

Recycle of battery P. 22

TEMPERATURE RECORDER for AT type P. 27

BACK-UP SYSTEM for AT type P. 29

SPECIFICATIONS P. 30

PERFORMANCE P. 31

SAFETY CHECK SHEET P. 32

2

INTRODUCTION

■ Read this manual carefully before using the appliance and follow the instructions for safety operation.

■ Sanyo never guarantee any safety if the appliance is used for any objects other than intended use or

used by any procedures other than those mentioned in this manual.

■ Keep this manual in an adequate place to refer to it as necessary.

■ The contents of the manual will be subjected to change without notice due to the improvement of

performance or functions.

■ Contact Sanyo sales representative or agent if any page of the manual is lost or page order is incorrect.

■ Contact Sanyo sales representative or agent if any point in this manual is unclear or if there are any

inaccuracies.

■ No part of this manual may be reproduced in any form without the expressed written permission of
Sanyo.

3

PRECAUTIONS FOR SAFE OPERATION

It is imperative that the user complies with this manual 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 this manual 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 a service personnel only.

WARNING

As with any equipment that uses CO2 gas, 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 restricted ventilation is suspected, then other methods of ensuring a
safe environment must be considered. These may include atmosphere monitoring and warning
devices.

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 pow er 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 supply cord if its plug is loose. Such 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 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
cord. A damaged cord may cause electric shock or fire.

Disconnect the power 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 doors cannot be closed completely.

The disposal of the unit should be accomplished by appropriate personnel. Remove doors to

prevent accidents such as suffocation.

Do not put the packing plastic bag within reach of children as suffocation may result.

WARNING

6

PRECAUTIONS FOR SAFE OPERATION

Use a dedicated power source (a dedicated circuit with a breaker) as indicated on the rating label

attached to the unit. A branched circuit may cause fire resulting from abnormal heating.

Connect the power supply plug to the power source firmly after removing the dust on the plug.
A dusty plug or improper insertion may cause a heat or ignition.

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;

■ Ambient temperature 5

o

C to 40oC

■ Maximum relative humidity 80% for temperature up to 31

o

C decreasing linearly to 50% relative humidity

at 40

o

C;

■ Mains supply voltage fluctuations not to exceed ±10% of the nominal voltage;

■ Other supply voltage fluctuations as stated by the manufacturer;

■ Transient overvoltages according to Installation Categories (Overvoltage Categories) II; For mains

supply the minimum and normal category is II;

■ Pollution degree 2 in accordance with IEC 60664.

8

FREEZER COMPONENTS

Rear side

14

Fixture

Remote alarm
terminal

4

4

MDF-394

1

3

12

7

8
9

15

2

10

13

5

11

6

9

FREEZER COMPONENTS

1. Lock: Turn clockwise to 180

o

with a key and the outer door is securely locked.

2. Door: Hinged type. The door can be opened in any angle on the way to full open.

3. Magnetic door gasket: Seals the door and prevents leakage of cold air.

4. Back-up system joint (rear side): It is positioned at rear of the unit. Serves to connect with the

pipelines from the liquid CO

2

cylinder. (AT type only)

5. Side panel:

6. Temperature display area: The digital temperature indicator, alarm lamp, and filter check lamp are
installed.

7. Control panel: Temperature control key, power switch and so on are installed. AT type has a

temperature recorder and switches of back-up system. Refer to page 10 for details.

8. Control panel cover

9. Control panel cover lock: To lock the control panel cover to avoid the setting by accidental contact.

10. Exhaust air vent: Be careful not to block this.

11. Intake air vent (grille): Do not block this vent to keep the proper cooling performance.

12. Leveling foot: Serves to adjust the height and to settle the frame.

13. Caster: 4 casters are provided. They make the moving of the unit easier.

14. Access port: Serves a means of leading the measuring cable from the chamber to the outside.

15. Inner lid: Serves as a means of reducing cold air leakage when the door is open. Remove the

frost before it is accumulated too much.

10

FREEZER COMPONENTS

Control panel

1. Alarm buzzer stop key (BUZZER): To stop the alarm from sounding, press this key. Should a
further abnormality occur, the buzzer will sound automatically.

2. Filter check lamp (FILTER CHECK): This lamp lights when the condenser filter is clogged. Clean

the condenser filter according to page 19 “Cleaning of condenser filter”.

3. Alarm lamp (ALARM) and buzzer: they operate in the following cases:
a) Break down or power failure at the power supply.

- Alarm lamp flickering, buzzer sounds.

b) The following procedure shows the setting of alarm temperature according to the condition
below:

High temperature alarm: activates at the temperature 10

o

C (factory setting) higher than the set

temperature

Low temperature alarm: activates at the temperature -10

o

C (factory setting) lower than the set

temperature

- Alarm lamp flickering, buzzer sounds about 15 minutes later.

4. Alarm test key (ALARM TEST): To check the alarm system during freezer operation. Pressing

this key with the battery switch ON gets the alarm lamp to flash, the remote alarm to operate, and the
buzzer to sound.

5. Set key (SET): Chamber temperature setting mode is led by pressing this key. The changeable

digit is flashed. Pressing this key again after temperature setting memorizes the setting.

6. Digit shift key ( ): Pressing this key in the setting mode causes the changeable digit to shift.

Key lock 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 function.

7. Numerical value shift key ( ): Pressing this key in the setting mode causes the numerical value

to shift.

8. Battery switch: It is the switch of the battery for the power failure alarm. Turn it on usually. Turn it

off when you do not use the freezer for a long time (More than one month).

9. CO

2

Back-up test swit ch (TEST) : (AT type): Examine the functions of the back-up system. This

switch allows liquid CO

2

to spout under any circumstances. Handle it according to page 29 “Back-up

system for AT type”.

10. CO

2

Back-up switch (CO2 BACK UP): (AT type): Switch ON for operation of the back-up system

and switch OFF for stopping. Handle this switch according to page 29 “Back-up system for AT type”.

11. Power switch (POWER): Power all functions except remote alarm and back-up system for AT

type.

12. Temperature recorder (AT type): This records the internal temperature. Refer to page 27

“Temperature recorder for AT type”.

7

11 10 9 8

16542 3

12

< MDF-394AT >

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
and +30

o

C.

■ 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 flammable or volatile location. 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 doors 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.

2. Adjusting the leveling foot

Extend the leveling feet by rotating them counterclockwise
to contact them to the floor. Ensure the unit is level.
See figure.

3. Fixing the unit

Two fixtures are attached to the rear of the frame. Fix the
frame to the wall with these fixtures and rope or chain.

4. Ground (earth)

The ground (earth) is for preventing the electric shock in the case of the electrical insulation is somehow
degraded. 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

Follow the procedures for the initial and consequent operations of the unit.



1. Make sure that all the switches on the control panel, such as the power switch, the battery switch, the

back-up switch (AT type) are turned off.

2. By using the joint and connect tube enclosed with the freezer, connect the liquid CO2 cylinder to the

joint of the back-up system. (AT type)

3. Shut the door and connect the power cord to the power supply after the inner lid is installed.

4. Turn on the power switch, and temperature is displayed on the temperature display area. This freezer

uses a cascade refrigeration system. At first a compressor operates for a while, and then another
compressor starts cooling.

5. Turn on the battery switch.

Note:

The battery needs to be replaced about every 3 years. Contact Sanyo sales representative or agent for
battery replacement.

6. The alarm buzzer sometimes operates. In this case, stop the buzzer by pressing the alarm buzzer

stop key (BUZZER). Do not set the chamber temperature lower than -85

o

C.

7. Set the chamber temperature to the desired temperature.

8. Make sure the required temperature is displayed on the temperature display.

9. Turn on the battery switch and the CO

2

back-up switch for AT type.

10. Make sure that the alarm lamp blinks and the buzzer sounds, by pressing the alarm test key (ALARM

TEST).

11. In the case of operating AT type, make sure that liquid CO

2

spouts into the freezer by pushing the

CO

2

back-up test switch (TEST).

12. Now you can put articles into the freezer. Switch off the battery switch and the CO

2

back-up switch

(AT type only) temporarily when putting in a lot of warm articles. Switch on again after a certain period
of operation.

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 -75

o

C.

Note: The unit is set at the factory that the chamber temperature -80

o

C.

Table 1. Basic operation sequence (Example: Chamber temperature -75

o

C)

Description of operation Key operated Indication after operation

1 Turn the power switch on.

----

The current chamber temperature is
displayed.

2 Press set key. SET

The current setting is displayed.
The second digit is flashed.

3

Set to -75 with the numerical value
shift key and digit shift key.

When pressed, the figure of settable
digit changes.
When pressed, the settable digit
is shifted.

4 Press set key. SET

Set temperature is memorized and the
current chamber temperature is
displayed.

Note:

• The temperature set mode returns to the temperature display mode automatically when 90 seconds has

passed without any key operation.

• Although the value of the chamber temperature setting can range from -50

o

C to -90oC, the guaranteed

temperature with no load is -86

o

C when the ambient temperature is 30oC.

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 first digit is flashed.

3

Press the 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 temperature set mode returns to the temperature display mode automatically when 90 seconds has

passed without any key operation.

15

ALARM TEMPERATURE SETTING

This unit is provided with the high and low temperature alarm and the temperature at which the alarm is
activated is changeable.
The following procedure shows the setting of alarm temperature according to the condition below:
High temperature alarm: activates at the temperature 5

o

C higher than the chamber set temperature

Low temperature alarm: activates at the temperature 5

o

C lower than the chamber set temperature

Note:
The alarm temperature is set at the factory 10

o

C higher and lower than the chamber set temperature.

The available range of alarm temperature is between 5

o

C and 20oC higher or lower than the chamber set

temperature.

Table 3. Procedure for setting high temperature alarm (Change from 10

o

C to 5oC)

Description of operation Key operated Indication after operation

1 ----

The current chamber temperature is
displayed.

2

Press the numerical value shift key
for about 5 seconds.

The first digit is flashed.

3

Press the numerical value shift key
and scroll the figure to 1.

The first digit is flashed.

4 Press set key. SET

The current setting is displayed.
The first digit is flashed.

5

Scroll the figure to 005 by using the
digit shift key and the numerical
value shift key.

When pressed, the figure of settable
digit changes.
When pressed, the changeable digit
moves.

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

o

C to -5oC)

Description of operation Key operated Indication after operation

1 ----

The current chamber temperature is
displayed.

2

Press the numerical value shift key
for about 5 seconds.

The first digit is flashed.

3

Press the numerical value shift key
and scroll the figure to 2.

The first digit is flashed.

4 Press set key. SET

The current setting is displayed.
The first digit is flashed.

5

Scroll the figure to -05 by using the
digit shift key and the numerical
value shift key.

When pressed, the figure of settable
digit changes.
When pressed, the changeable digit
moves.

6 Press set key. SET

Alarm temperature is memorized and
the current chamber temperature is
displayed.

• The temperature set mode returns to the temperature display mode automatically when 90 seconds has

passed without any key operation.

16

SETTING OF ALARM RESUME TIME

The alarm buzzer is silenced by pressing buzzer stop key (BUZZER) on the control panel during alarm
condition (The buzzer stops, but alarm lamp and remote alarm are not silenced.).
The buzzer will be activated again after certain suspension if the alarm condition is continued. The
suspension time can be set by following the procedure shown in the Table 5 below.
The example in the table is based on the assumption that the desired duration is 20 minutes.

Note: The duration is set in 30 minutes at the factory.

Table 5. Setting procedure for alarm resuming 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 digit shift key for 5 seconds.

The first digit is flashed.

3

Set the figure to F25 with the digit
shift key and the numerical value
shift key.

The settable digit is shifted.

When pressed, the figure of settable

digit changes.

4 Press set key. SET

The current reset time is displayed.
The second digit is flashed.

5

Set the figure to 020 with the
numerical value shift key.

When pressed, the figure of settable
digit changes.

6 Press set key. SET

The setting is memorized and
the current chamber temperature is
displayed.

• The settable alarm resume time is 10, 20, 30, 40, 50, or 60 minutes (The setting is 010, 020, 030, 040,

050, or 060). The buzzer would not resume if the reset time is set in 000.

• It is recommended to set the alarm resume time when the freezer is not under alarm condition. The

setting during alarm condition is effective on the next alarm condition.

• The setting cannot be changed during power failure.

• 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.

17

REMOTE ALARM TERMINAL

The terminal of the remote alarm is located at rear of the machinery room, upper side 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 alarm is actuated when the power cord is disconnected from the outlet or the power switch is off.

18

ALARMS & SAFETY FUNCTIONS

This unit has the alarm and safety functions shown in table below, and also self diagnostic function.

Table 6. Alarm and safety function

Alarm & safety 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.
Chamber temperature 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.

Power failure alarm

When the power to the unit is
disconnected.

Alarm lamp is flashed. Intermittent tone Remote alarm.

Filter alarm When the condenser filter is clogged. Filter check lamp lights. Intermittent tone -----

Auto-return

When there is no key pressing in
each setting mode for 90 seconds.

Chamber temperature is
displayed.

-----

Finishing of each
setting mode.

Key lock When the key lock is ON. ----- -----

Change of setting is
disable.

Sensor abnormality

If the thermal sensor is disconnected.

Alarm lamp is flashed.
E01 and chamber temp. are
displayed alternately.

Intermittent tone

Remote alarm.
Unit keeps continuous
running.

If the thermal sensor is short-circuited.

Alarm lamp is flashed.
E02 and chamber temp. are
displayed alternately.

Intermittent tone

Remote alarm.
Unit keeps continuous
running.

If the cascade sensor is disconnected.

Alarm lamp is flashed.
E03 and chamber temp. are
displayed alternately.

Intermittent tone Remote alarm.

If the cascade sensor is short
circuited.

Alarm lamp is flashed.
E04 and chamber temp. are
displayed alternately.

Intermittent tone Remote alarm.

If the filter sensor is disconnected.

Alarm lamp is flashed.
E05 and chamber temp. are
displayed alternately.

Intermittent tone Remote alarm.

If the filter sensor is short-circuited.

Alarm lamp is flashed.
E06 and chamber temp. are
displayed alternately.

Intermittent tone Remote alarm.

If the ambient temperature sensor is
disconnected.

Alarm lamp is flashed.
E07 and chamber temp. are
displayed alternately.

Intermittent tone Remote alarm.

If the ambient temperature sensor is
short-circuited.

Alarm lamp is flashed.
E08 and chamber temp. are
displayed alternately.

Intermittent tone Remote alarm.

Battery switch
check

When the battery switch is OFF during
alarm test.

Alarm lamp is flashed.
E09 is flashed.

----- -----

Condenser temp.
abnormality

In the event of failure of fan motor for
cooling the compressor

E10 and chamber temp.
are displayed alternately.

Intermittent tone

Remote alarm.
Compressor of high
stage side stops.

Battery check

When about 3 years has passed with
power switch ON.

F1 and chamber temperature
are displayed alternately.

----- -----

Fan motor check

When about 6 years has passed with
power switch ON.

F2 and chamber temperature
are displayed alternately.

----- -----

Note：

The filter check lamp sometimes lights and buzzer sounds at the start-up under high ambient temperature.
The lamp is off when the chamber temperature is getting lower.

Operation after power failure

The set value (setting of chamber temperature and alarm temperature) is memorized by nonvolatile
memory. Accordingly, the freezer resumes the operation with setting before power failure.

19

ROUTINE MAINTENANCE

WARNING

Always disconnect the power supply to the unit prior to any repair or maintenance of the unit in

order to prevent electric shock or injury.
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.

Cleaning of cabinet

• Clean the unit once a month. Regular cleaning keeps the unit looking new.

• Use a dry cloth to wipe off small amounts of dirt on the outside and inside of the unit and all accessories.
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
cabinet or accessories with a dry cloth.

• Never pour water onto or into the unit. Doing so can damage the electric insulation and cause failure.

• The compressor and other mechanical parts are completely sealed. This unit requires absolutely no
lubrication.

• Check the back-up system by pressing test key (TEST) once a month if it is installed.

• Remove the frost or ice on the chamber wall and clean the condenser filter once a month.

Cleaning of condenser filter

The unit is provided with the filter check lamp. This lamp
lights and buzzer sounds when the condenser filter is
clogged. Clean the condenser filter according to the
following procedure. As a clogged condenser filter may
cause poor cooling and compressor trouble, clean it once
a month. The condenser filter fitted to the grille can be
removed as shown in the figure.

1. Open the grille in the front.

2. Remove the condenser filter installed inside the grille,

wash it with water and dry it naturally.

3. Replace the clean condenser filter as before.

4. Replace the grille and check that the condenser filter

check lamp is off.

Defrosting of inside wall

Defrost the inside wall of the freezer as follows:

Normal defrosting

Remove the frost by the enclosed scraper. Take care not to damage the inside wall.

Thorough defrosting

1. Take out and transfer all the contents to another freezer or container which contains liquid CO

2

, liquid

N

2

, or dry ice. Switch off the CO2 back-up switch (CO2 BACK UP) of AT type. Turn off the power

switch and battery switch.

2. Open the door and remove the inner lid. Leave the freezer as it is. The water remaining in the
freezer compartment should be wiped up.

3. After cleaning is completed, restart the operation according to the procedure on page 13. Put back
the articles into the sufficiently cooled freezer compartment.

20

TROUBLESHOOTING

If the unit malfunctions, check out the following before calling for service.

Malfunction Check/Remedy

The chamber is not cooled
at all

￭ The voltage is too low. (In this case, call an electrician.)
￭ The breaker is free.
￭ The fuse is blown.

Sometimes the freezer is not cooled at all for about 5 minutes after
starting-up.

The cooling is poor

￭ The ambient temperature is too high.
￭ The door is not shut tightly.
￭ The inner lid is not installed correctly.
￭ The set temperature in the controller is not set properly.
￭ The grille is blocked out.
￭ The filter is clogged. Clean the filter when the filter check lamp

lights.

￭ The freezer is in the direct sunlight.
￭ There is any heating source near the freezer.
￭ A rubber cap and insulation for the access port are not set

correctly.

￭ You put too many unfrozen articles into the freezer compartment.
￭ Too much frost is accumulated in the chamber.

Alarm test key cannot
actuate the alarm

￭ The alarm test key does not function when the power switch of
the freezer is off.

￭ When only the buzzer or only the alarm is actuated by the alarm
test key, the unactuated part is out of order, and must be replaced.

Noise

￭ The freezer is not installed on the sturdy floor.
￭ There is anything touching the frame.
￭ The freezer is not leveled with the leveling feet.
￭ It is the immediately after starting of refrigeration.

The freezer causes larger noise when the chamber temperature is
high because of large load. The noise gets smaller along with
chamber temperature.

Back-up test switch does
not operate normally (when
the back-up system is
provided) (AT type)

￭ The liquid CO

2

cylinder is empty.

￭ The valve of the liquid CO

2

cylinder is not opened.
￭ The ambient temperature is too high. In this case, move the
liquid CO

2

cylinder to a cool location.

Inquire at liquid CO

2

suppliers about cylinder check, adjustment,

installation, or move.

Note:

If the malfunction is not eliminated after checking the above items, or the malfunction is not shown in the
above table, contact Sanyo sales representative or agent.

21

REPLACEMENT OF BATTERY

Location of a nickel-metal-hydride battery

This unit is provided a nickel-metal-hydride battery for the power failure alarm. The battery is located in
the control box behind the control panel. (Fig. 1)

The high voltage components are enclosed in the control box. The cover should be removed by
a qualified engineer or a service personnel only to prevent the electric shock.

Removal of nickel-metal-hydride battery

1. Turn off the power switch, battery switch and disconnect the power supply plug.

2. As shown in the Fig. 2, remove four (4) fixing screws on the side cover and remove the side cover.

3. Remove two (2) and loose one (1) fixing screws on the control box to remove the control box cover.

(Fig. 3)

4. Remove two (2) screw fixing the fixture securing the battery and then disconnect the connector.
(Fig. 4)

Handling of battery

Cover the battery terminal with an insulating tape to avoid the short circuit. Then follow the procedure for
recycling or proper disposal.

Fig. 3

Fig. 1 Fig. 2

Fig. 4

Control box

Side Cover

Control box

Battery

Fixture

22

DISPOSAL OF UNIT

WARNING

If the unit is to be stored unused in an unsupervised area for an extended period ensure that children
do not have access and doors cannot be closed completely.
The disposal of the unit should be accomplished by appropriate personnel. Always remove
doors to prevent accidents such as suffocation.

Recycle of battery

The unit contains a rechargeable battery. The battery is recyclable. At the end

of it’s useful life, check with you local solid officials option or proper disposal.

＊Label indication is obliged to comply with Taiwanese battery regulation.

廢電池
請回收

23

DISPOSAL OF UNIT

(English)

FOR EU USERS
The symbol mark and recycling systems described below apply to EU countries and do not apply to
countries in other areas of the world.

Your SANYO product is designed and manufactured with high quality materials and components which
can be recycled and/or reused.

The symbol mark means that electrical and electronic equipment, batteries and accumulators, at their
end-of-life, should be disposed of separately from your household waste.

Note:
If a chemical symbol is printed beneath the symbol mark, this chemical symbol means that the battery or
accumulator contains a heavy metal at a certain concentration. This will be indicated as follows: Hg:
mercury, Cd: cadmium, Pb: lead

In the European Union there are separate collection systems for used electrical and electronic equipment,
batteries and accumulators.
Please, dispose of them correctly at your local community waste collection/recycling centre.

Please, help us to conserve the environment we live in!

(German)

Für EU-Staaten
Das Symbol und das erwähnte Wiederverwertungssystem gelten nur für die Länder der EU und nicht für
andere Länder oder Gebiete in der Welt.

Die Produkte von SANYO werden aus hochwertigen Materialien und Komponenten gefertigt, die sich
wieder verwenden lassen.

Das Symbol bedeutet, dass elektrische oder elektronische Geräte, Batterien und Akkus am Ende ihrer
Lebensdauer nicht im Haushaltmüll entsorgt werden dürfen.

Hinweis:
Ein chemisches Zeichen unter dem Symbol bedeutet, dass die Batterie bzw. der Akku Schwermetalle in
gewissen Konzentrationen enthält. Die Metalle werden wie folgt bezeichnet: Hg: Quecksilber, Cd:
Kadmium, Pb: Blei

In der Europäischen Union gibt es separate Sammelstellen für elektrische und elektronische Geräte,
Batterien und Akkus.
Entsorgen Sie solche Geräte bitte richtig in der kommunalen Sammelstelle bzw. im Recyclingzentrum.

Helfen Sie mit, die Umwelt in der wir leben, zu schützen.

24

DISPOSAL OF UNIT

(French)

POUR LES UTILISATEURS DE UE
Le symbole et les systèmes de recyclage évoqués ci-dessous s'appliquent uniquement aux pays de UE.

Votre produit SANYO est conçu et fabriqué avec des composants et des matériaux de hautes qualités qui
peuvent être recyclés et/ou réutilisés.

Le symbole signifie que les équipements électriques et électroniques, les batteries et les accumulateurs
ne doivent pas être mis au rebut avec les déchets domestiques à l'issue de leur durée de vie.

Remarque:
Si un symbole chimique est imprimé sous le symbole, le symbole chimique indique que la batterie ou
l'accumulateur contient une certaine concentration de métaux lourds. Les métaux sont indiqués de la
manière suivante: Hg: mercure, Cd: cadmium, Pb: plomb.

Il existe différents systèmes de collecte pour les équipements électriques et électroniques, les batteries et
les accumulateurs usagés au sein de l'Union européenne.
Veuillez mettre les équipements au rebut de manière correcte, auprès de votre centre de recyclage/de
collecte des déchets local.

Aidez-nous à préserver l'environnement dans lequel nous vivons!

Les machines ou appareils électriques et électroniques contiennent fréquemment des matières qui, si
elles sont traitées ou éliminées de manière inappropriée, peuvent s’avérer potentiellement dangereuses
pour la santé humaine et pour l’environnement.
Cependant, ces matières sont nécessaires au bon fonctionnement de votre appareil ou de votre machine.
Pour cette raison, il vous est demandé de ne pas vous débarrasser de votre appareil ou machine usagé
avec vos ordures ménagères.

(Spanish)

PARA USUARIOS DE LA UNION EUROPEA

El símbolo y los sistemas de reciclado descriptos a continuación se aplican para países de la Unión
Europea y no se aplica para países en otras áreas del mundo.

Su producto SANYO fue diseñado y fabricado con materiales de alta calidad y componentes que pueden
ser reciclados y/o vueltos a usar.

El símbolo significa que los equipos eléctricos y electrónicos, baterías y acumuladores, al final de su vida
útil, debe ser desechados separadamente de sus residuos domiciliarios.

Nota:
Si hay un símbolo químico impreso debajo del símbolo, este símbolo químico significa que la batería o
acumulador contiene una cierta concentración de un metal pesado. Esto es indicado de la siguiente
manera: Hg: mercurio, Cd: cadmio, Pb: plomo

En la Unión Europea hay sistemas de recolección separados para equipos eléctricos y electrónicos,
baterías y acumuladores usados.
Por favor, disponga de ellos correctamente en el centro de recolección de residuos/reciclado de la
comunidad de su localidad.

Por favor, ayúdenos a proteger el medio ambiente en que vivimos!

25

DISPOSAL OF UNIT

(Portuguese)

PARA UTILIZADORES DA UE
O símbolo e os sistemas de reciclagem descritos abaixo aplicam-se aos países da UE e não se aplicam
aos países noutras áreas do mundo.

O seu produto SANYO foi concebido e fabricado com materiais e componentes de elevada qualidade
que podem ser reciclados e/ou reutilizados.

O símbolo significa que o equipamento eléctrico e electrónico, baterias e acumuladores, em final de vida,
não devem ser deitados fora juntamente com o lixo doméstico.

Atenção:
Se estiver impresso um símbolo químico debaixo do símbolo de , este símbolo químico significa que a
bateria ou acumulador contém um metal pesado numa determinada concentração. Estará indicado da
seguinte forma: Hg: mercúrio, Cd: cádmio, Pb: chumbo

Na União Europeia existem sistemas de recolha separados para equipamento eléctrico e electrónico,
baterias e acumuladores.
Por favor, entregue-os no seu centro de reciclagem/recolha de lixo local.

Por favor, ajude-nos a conservar o ambiente!

(Italian)

PER UTENTI UE
Il simbolo e i sistemi di riciclaggio descritti di seguito si applicano esclusivamente ai paesi dell’UE.

Questo prodotto SANYO è stato progettato e realizzato con materiali e componenti di elevata qualità che
possono essere riciclati e/o riutilizzati.

Il simbolo di riciclaggio mostrato di seguito indica che i dispositivi elettrici ed elettronici, le batterie e gli
accumulatori, una volta esauriti, devono essere smaltiti separatamente rispetto ai rifiuti domestici.

Nota:
Se sotto il simbolo di riciclaggio appare un simbolo chimico, esso sta ad indicare che la batteria o
l’accumulatore contengono metalli pesanti a determinate concentrazioni. Questo viene specificato come
segue: Hg: mercurio, Cd: cadmio, Pb: piombo.

Nell’Unione europea esistono diversi sistemi per la raccolta dei rifiuti speciali quali i dispositivi elettrici ed
elettronici, le batterie e gli accumulatori.
Si raccomanda di provvedere allo smaltimento di tali rifiuti secondo quanto previsto dalle normative
vigenti in materia.

Aiutaci a conservare l’ambiente!

26

DISPOSAL OF UNIT

(Dutch)

VOOR GEBRUIKERS IN DE EU
Het symbool en de recycleersystemen die hieronder beschreven worden, zijn van toepassing op de
landen in de EU en zijn niet van toepassing op landen in andere delen van de wereld.

Uw SANYO product is ontworpen en gemaakt met materialen en onderdelen van hoge kwaliteit, die
gerecycleerd en opnieuw gebruikt kunnen worden.

Het symbool betekent dat elektrische en elektronische apparatuur, batterijen en accu's aan het eind van
hun leven apart van uw huisafval weggegooid moeten worden.

Let op:
Indien een chemisch symbool afgedrukt staat onder het symbool, betekent dit chemisch symbool dat de
batterij of accu een zwaar metaal met een bepaalde concentratie bevat. Dit wordt als volgt aangegeven:
Hg: kwik, Cd: cadmium, Pb: lood

In de Europese Unie zijn afzonderlijke inzamelingssystemen voor gebruikte elektrische en elektronische
apparatuur, batterijen en accu's.
Wilt u deze op de juiste manier weggooien bij uw plaatselijk afvalinzameling-/recyclingcentrum in uw
buurt?

Help ons het milieu waarin wij leven in stand te houden!

(Swedish)

FÖR ANVÄNDARE INOM EU
Den symbolmärkning och de återvinningssystem som beskrivs här nedan gäller länder inom EU och
gäller inte länder i någon annan del av världen.

Din SANYO-produkt har konstruerats och tillverkats med delar och material av hög kvalitet, som kan
återvinnas och/eller återanvändas.

Symbolmärkningen innebär att elektrisk och elektronisk utrustning, batterier och ackumulatorer, vid slutet
av deras livslängd, inte får slängas som hushållsavfall utan skall slängas separat.

Observera:
Om en kemisk symbol finns tryckt under denna symbolmärkning, betyder denna kemiska symbol att
batteriet eller ackumulatorn innehåller en tungmetall med en viss koncentration. Detta indikeras på
följande sätt: Hg: kvicksilver, Cd: kadmium, Pb: bly

I den Europeiska Unionen finns det separata uppsamlingssystem för använd elektrisk och elektronisk
utrustning, batterier och ackumulatorer.
Gör dig av med sådana saker på rätt sätt på den speciella lokala platsen för återsamling/återanvändning.

Hjälp oss att bevara den miljö vi lever i!

27

TEMPERATURE RECORDER for AT type

The figure below shows the description of a temperature recorder. The temperature recorder is provided
with model AT type.

Feeding of recording chart

1. Open the door and let down the penholder; level the pen point is apart from the recording chart.

2. Pull the cartridge out of the mounted position. (Fig. 1) (Fig. 2)

3. Set a new recording chart in place on the rear bottom of the cartridge. Set the hole on the recording

chart in the cog of the chart driving assembly and feed the recording chart in the direction of the arrow by
driving the cog wheel. (Fig. 3)

4. Set the recording chart according to the mark of day and time.

5. When mounting, lay down the cartridge first, and push into the mounting position with the groove set a

the projection on the position.

6. Set up the cartridge and settle in position.

7. Let up the penholder lever.

Recording indicator

Pen holder lever

Door

Warning indicator

Cartridge

Time Temperature

Fig. 2

Fig. 3

Fig. 1

28

TEMPERATURE RECORDER for AT type

Replacement of dry cell

Replace the dry cell once a year as follows:

1. Let down the penholder first, then pull out cartridge from the
mounted position.

2. The dry cell chamber cover with wire, on the bottom left side, and
take out the dry cell.

3. The dry cell in the minus (-) side first. (The front is a plus (+)
side.)

4. Shut the dry cell chamber cover after replacing dry cells. Mount
the cartridge as before and put up the penholder lever.

Note :

This temperature recorder is designed for the manganese dry cell
and the alkaline dry cell.
Do not use a rechargeable battery because the initial voltage of
such battery is low. The rechargeable battery may cause the
malfunction of recorder or shorten the battery life significantly.

Setting of back-up temperature

1. There is a warning indicator on the top of the temperature displayer. Adjust the warning indicator with

your finger to back-up temperature, at which back-up system starts to operate.

2. Set at a temperature 15

o

C higher than that of the chamber set temperature.

Penholder

Install a recording pen in the penholder as shown in the figure.
Make sure that the recording pen is completely inserted for accurate
recording. The recording pen is packed together with the chart.

1. Let down the penholder lever, then pull out the cartridge from the
mounted position.

2. Replace the recording pen.

3. Mount the cartridge into place.

4. Lift up the penholder lever and make sure that the recording pen

point touches the recording chart.

Note:

￭ Turn off the back-up switch when the freezer operation is stopped or the back-up system is not used.
The battery for back-up system is discharged when the back-up switch is kept on.

￭ The additional recording pen or recording chart is available from Sanyo sales representative or agent.
￭ To stop the temperature recorder, remove the dry cell from the temperature recorder. The back-up

system can operate without temperature recorder. Always remove a recording pen as well because the
recording chart can be torn resulting from ink spot. The torn recording chart may interfere recording pen
tip movement, which results in no activation of back-up system.
￭ The dry cell for temperature recorder normally keeps about one year. However, the dry cell life is
shorten depending on the ambient temperature condition. The enclosed dry cell may have shorter life
since it is for monitor.
￭ The liquid leakage or rust can be caused when a used dry cell or a dry cell over effective limit is left as
it is, which gives adverse effect on the temperature recorder.

Dry Cell

29

BACK-UP SYSTEM for AT type

WARNING

As with any equipment that uses CO

2

gas, there is a likelihood of oxygen depletion in the vicinity
of the equipment. It is important that you assess the work site to endure there is suitable and
sufficient ventilation. If restricted ventilation is suspected, then other methods of ensuring a safe
environment must be considered. These may include atmosphere monitoring and warning
devices.

The freezer AT type is provided with an automatic liquid CO

2

gas injection device as a back-up system.

This freezer prevents the chamber temperature from going up by injecting the liquid CO

2

gas when the
power supply is disconnected (power failure, disconnection of power cord, breaker OFF) or in the case of
failure of freezer itself. The liquid CO

2

gas is injected with the activation of solenoid valve energized by
battery when the chamber temperature reaches the alarm temperature.
Following shows the procedure for setting the back-up system.

1. Setting of liquid CO

2

cylinder
By using the joint and connect tube enclosed with
the freezer, connect the liquid CO

2

cylinder to the
joint of the back-up system. For this setting,
consult with a qualified gas supplier or Sanyo sales
representative agent.

2. After setting the liquid CO

2

cylinder, operate the
freezer until the chamber temperature reaches the
required level.

3. Set the warning indicator of the temperature
recorder at the temperature higher than -70

o

C.
The back-up system is operated continuously if the
warning indicator is set at the temperature lower
than -70

o

C. This means the liquid CO2 is

consumed very quickly.

4. Switch on the back-up system.

5. Make sure that CO

2

spouts into the freezer chamber by pressing the CO2 back-up test switch.

Note:

• The liquid CO

2

cylinder loses its cooling capacity at speed when the ambient temperature is over 31oC.

Install the liquid CO

2

cylinder in the cool environment. And the duration of back-up time per one liquid

CO

2

cylinder varies depending on the ambient temperature. Refer to “Installation of back-up system”

enclosed with the freezer for the available back-up time.

• The liquid CO

2

cylinder should be a siphon type.

• Use the connect tube enclosed with the freezer for the setting. (The extension of the pipe is not
permitted because of cooling capacity.)

Rough scheme

Connect
tube

Solenoid valve

Liquid CO2
cylinder

30

SPECIFICATIONS



Name Ultra-Low Temperature Freezer
Model MDF-394 MDF-394AT
External dimensions W1860 x D800 x H945 (mm)
Internal dimensions W1120 x D520x H530 (mm)
Effective capacity 309 L
Exterior Painted steel
Interior Stainless steel
Door Painted steel
Insulation Rigid polyurethane foamed-in place
Compressor Hermetic type, Output; 450 W (high stage side), 750 W (low stage side)
Evaporator Tube on sheet type
Condenser Fin and tube type (high stage side), Shell and tube type (low stage side)
Refrigerant R-404A (high stage side), R-508 (low stage side)
Temperature controller Microcomputer control system
Temperature display Digital display (-170 to +50oC)
Sensor

Platinum resistance (Pt 1000Ω)

Alarm High temp. alarm, Low temp. alarm, Power failure alarm, Filter alarm
Remote alarm contact Allowable contact capacity: DC 30 V, 2 A
Battery For power failure alarm; Nickel-metal-hydride battery, DC 6 V, 1100 mAh,

Auto-recharge (5HR-AAC)

For back-up system (only for AT type); Lead storage battery, DC 6 V 4 Ah x 4 pcs

Temperature recorder

Dry cell driven recording chart (for 2 months

per roll) , Cartridge type recording pen

Back-up system
(AT type)

-----­Liquid CO

2

Accessories

1 set of key, 1 scraper

1 set of key, 1 scraper

1 connect tube for back-up system

1 dry cell, 6 recording chart rolls

2 recording pens (cartridge)
Weight 219 kg 226 kg
Option Aluminum container (MDF-39SC)

Note :

￭ Design or specifications will be changed without notice.
￭ 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 Sanyo sales representative or agent at the time of
replacement of the battery for recycling.

￭ Fan motors are expendable supplies. Replace them for about every 6 years. Contact Sanyo sales
representative or agent at the time of replacement of the fan motor.



31

PERFORMANCE



Cooling performance -86oC (Ambient temperature; +30oC, no load)
Temperature control range -50 to -86oC
Power source (AC) 220 V, 50 Hz 230 V, 50 Hz 240 V, 50 Hz
Rated power consumption 620 W 650 W 680 W
Alarm duration 9 hours for power failure
Noise level 49 dB [A] (background noise; 20 dB)
Maximum pressure 1.73 MPa

Note :The unit with CE mark complies with EC directives 89/336/EEC, 93/68/EEC and 73/23/EEC.

32

CAUTION

Please fill in this form before servicing.

Hand over this form to the service engineer to keep for his and your safety.

Safety check sheet



1. Freezer contents : □Yes□No
Risk of infection: □Yes□No
Risk of toxicity: □Yes□No
Risk from radioactive sources: □Yes□No

(List all potentially hazardous materials that have been stored in this unit.)
Notes :

2.

Contamination of the unit:

Unit interior: □Yes□No
No contamination: □Yes□No
Decontaminated: □Yes□No
Contaminated: □Yes□No
Others:

3. Instructions for safe repair/maintenance of the unit
a) The unit is safe to work on □Yes□No
b) There is some danger (see below) □Yes□No

Procedure to be adhered to in order to reduce safety risk indicated in b) below.

Date :
Signature :

Address, Division :

Telephone :

Product name: Model: Serial number: Date of installation:

Ultra-low temperature MDF-394/394AT

f

reezer

Please decontaminate the unit yourself before calling the service engineer.

7FB6P10150000
(25 September 2008)

5-5, Keihan-Hondori 2-Chome
Moriguchi City, Osaka 570-8677 Japan

Printed in Japan