Panasonic MDF-U731 Series User manual

Please read these instructions carefully before using this product, and save this operating instructions
for future use.
See page 31 for model number.
MDF-U731
MDF-U731 Series
Biomedical Freezer
Operating Instructions

1
CONTENTS
INTRODUCTION P.2
PRECAUTIONS FOR SAFE OPERATION P. 3
ENVIRONMENTAL CONDITIONS P. 7
FREEZER COMPONENTS P. 8
Freezer unit P. 8
Control panel P. 10
INSTALLATION SITE P. 11
INSTALLATION P. 12
START-UP OF UNIT P. 12
TEMPERATURE SETTING P. 13
KEY LOCK FUNCTION P. 13
REMOTE ALARM TERMINAL P. 14
ALARM FUNCTIONS P. 15
SAFETY FUNCTIONS P. 15
SELF DIAGNOSTIC FUNCTIONS P. 16
MAINTENANCE P.17
Cleaning of cabinet P. 17
Cleaning of evaporating tray P. 17
Defrosting P. 18
TROUBLESHOOTING P. 19
DISPOSAL OF UNIT P. 20
Recycle of battery P. 20
Decontamination of unit P. 20
REPLACEMENT OF WEAR-OUT PARTS P. 26
Replacement of battery for power failure alarm P. 26
TEMPERATURE RECORDER (OPTION) P. 27
Setting of MTR-4015LH P. 27
Setting of MTR-G85A P. 28
SPECIFICATIONS P. 30
PERFORMANCE P. 31
SAFETY CHECK SHEET P. 32

2
INTRODUCTION
■Read this operating instructions carefully before using the appliance and follow the instructions for
safety operation.
■Our company 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 operating instructions.
■Keep this operating instructions in an adequate place to refer to it as necessary.
■The contents of the operating instructions will be subjected to change without notice due to the
improvement of performance or functions.
■Contact our sales representative or agent if any page of the operating instructions is lost or page order
is incorrect.
■Contact our sales representative or agent if any point in this operating instructions is unclear or if there
are any inaccuracies.
■No part of this operating instructions may be reproduced in any form without the expressed written
permission of our company.
CAUTION
Our company guarantees the product under certain warranty conditions. Our company in no
way shall be responsible for any loss of content or damage of content.

3
PRECAUTIONS FOR SAFE OPERATION
It is imperative that the user complies with this 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 this 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 a 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 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
This unit must be plug 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.
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.
Fix the shelves securely. Incomplete installation may cause injury or damage.
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 5oC to 40oC
■Maximum relative humidity 80% for temperature up to 31oC decreasing linearly to 50% relative humidity
at 40oC;
■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);

8
FREEZER COMPONENTS
Freezer unit
<Back side>
19
18
1
7
15
16
<Inside of the front cover>
13
4
7
8
5
6
2
3
1
12 14
9
10
11

9
FREEZER COMPONENTS
1. Lock: Turn clockwise to 180owith a key and the door is securely locked.
2. Magnetic door gasket: This prevents the cold air from escaping. Always keep clean.
3. Handle: Always grip this handle to open and close the door.
4. Leveling foot: The height of the freezer can be adjusted by this screw type foot. Keep the unit in
level at the installation.
5. Caster: 4 casters are provided to facilitate moving of the cabinet. For the installation, adjust the
leveling foot so that the front two casters cannot contact with the floor.
6. Shelf: Items to be stored in the chamber must be placed on the shelves. The maximum storage
weight for each shelf is 50 kg.
Note: Fix the shelf stopper and shelves securely. Incomplete installation may cause injury or damage.
Never touch the storage items with wet hands. Touching with the wet hands may cause frostbite
7. Access port: This is used for leading the measuring cable from the chamber to the outside. A total of
two (2) are provided. ; left side and top of the freezer.
8. Door latch: Turn clockwise to lock the door and also add the lock too.
9. Temperature sensor: Located on the rear of the chamber.
10. Cold air exhaust vent: Ensure this vent is never blocked. If this vent is blocked, temperature
regulation become unstable. Do not place stored item in the path of cold air.
11. Air intake vent: Ensure this vent is never blocked. Failure to do so will result in unstable
temperature distribution in the chamber.
12. Control panel: The operation status is displayed on this panel. And the temperature setting is
available through this panel. Refer to page 10 for details.
13. Front cover: Open this cover when connecting the remote alarm or using the power supply outlet.
14. Space for temperature recorder: Space for a temperature recorder (optional component) is
available separately. See page 26 “TEMPERATURE RECORDER (OPTION)”.
15. Battery switch: Switch for battery used for power failure alarm. Always keep ON. Turn the
switch OFF when the unit is in no use for a long period (more than one month).
16. Remote alarm terminal: Used to notify an alarm condition of the unit to remote location. See
page 14 for details.
17. Evaporating tray (back side): Defrost water from the evaporator accumulates in the evaporating
tray and evaporates into the atmosphere. See page 17 for cleaning.
18. Power switch (back side): This is for turning ON/OFF the power to the unit. ON – “I” OFF – “○”
19. Fixture (back side): These keep the adequate apace between the unit and wall, and also can be
used for fixing the unit.

10
FREEZER COMPONENTS
Control panel
1. Door check lamp (DOOR): This lamp is lit when the door is open.
2. Alarm lamp (ALARM): This lamp is flashed during alarm condition.
3. Temperature display: This indicator shows the chamber temperature, set temperature, or error
code.
4. Numerical value shift key ( ): Pressing this key in the setting mode causes the numerical value to
change. ON-OFF of key lock can be selected by pressing this key in the key lock setting mode.
5. Digit shift key ( ): Pressing this key in setting mode causes the changeable digits to move. Key
lock is activated by pressing this key for more than five seconds in the temperature display mode. See
“Key lock function” on page 14.
6. Set key (SET): At “temperature display mode”; pressing this key leads “chamber temperature setting
mode”.
At “setting mode”; stores the value into computer memory.
7. Defrost key (DEF): Defrost will be started by pressing this key for more than 5 seconds.
8. Alarm buzzer stop key (BUZZER): Press this key to silence the buzzer in the event that the alarm
operates and buzzer sounds. See page 15, 16 for the details.
9. Alarm test key (ALARM TEST): The lamp is blinks and buzzer will sound and remote alarm will be
activated by pressing this key.
9 8 7 6 5 4
2 3
1
DOOR ALAR

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 +5oC
and +35oC.
■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 fixed metal fittings (the side of the
left) (Fig. 1) 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.
Note:
Remove the cable tie banding the power supply cord.
Prolonged banding may cause the corrosion of the cord
coating.
2. Removal of the door fixed plate
The door of the product is fixed by the door fixed plate.
A screw hole should fix an attached plastic screw on the
product. (4 places) (Fig. 1)
3. Adjusting the leveling foot
Extend the leveling feet by rotating them counterclockwise to
contact them to the floor. Ensure the unit is level. (Fig. 2)
4. 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.
(Fig. 3)
5. 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.
Fig. 1
Fig. 2
Leveling foot
Fixture
Fig. 3

13
START-UP OF UNIT
Follow the procedures for the initial and consequent operations of the unit.
1. A plug is connected with the power supply without putting samples in the product.
2. A power switch and a battery switch are turned on.
3. Push an alarm buzzer stop key (BUZZER), and stop an alarm buzzer though an alarm buzzer may
ring.
4. Set up chamber temperature.
5. Check that chamber temperature gets cold to setup temperature.
6. An alarm test key (ALARM TEST) is pushed, and an alarm lamp flashed, and it is checked that an
alarm buzzer rings. At this time, a remote alarm works, too. (When a remote alarm terminal is being
used.)
7. Put the storage samples by the above inspection so that chamber temperature may not rise when it is
completely normal.
< Important >
Do not block the air intake vent or air exhaust vent in the freezer. Arrange the storage items with
adequate space to keep the air circulation.
A sample deteriorates when chamber temperature rises.
Operation after power failure
The set value is memorized by nonvolatile memory. Accordingly, the freezer resumes the operation with
setting before power failure.
Note:
As for the after power failure, a product may not start by the voltage descent and so on so that all
machines may start at the same time. Be sure to check the operation conditions of the product.
TEMPERATURE SETTING
Table 1 shows the basic operation method. Perform key operations in the sequence indicated in the
table. The example in the table is based on the assumption that the freezer temperature is -25oC.
Note: The unit is set at the factory that the chamber temperature -30oC.
Table 1 Basic operation sequence (Example: Chamber temperature -25oC)
Description of operation Key operated Indication after operation
1 Connect the power source and turn
on the power switch. ----
The current chamber temperature is
displayed. Chamber temperature
higher than 1oC to be displayed ”HI”
lower than -41oC to be displayed “LO”.
2 Press set key. SET The first digit is flashed.
3
Set the temperature to -25 with the
digit shift key and the numerical
value shift key.
When pressed, the settable
digit shifted.
When pressed, the figure of settable
digit changes.
4 Press set key. SET
Set temperature is memorized and the
current chamber temperature is
displayed.
The freezer temperature can be set in the range between -15 and -35oC. Remember that the
guaranteed temperature with no load at an ambient temperature of 35oC is -30oC
The setting mode returns to the temperature display mode automatically when 90 seconds has passed
without any key operation. In this case, any setting before pressing the set key (SET) is not memorized.

14
KEY LOCK FUNCTION
This unit is provided with the key lock function. When the key lock is ON, change of the setting through
the key pad is not available. The key lock is set in OFF at the factory.
Display Mode Function
L o 0 Key lock is OFF Enable to change of temperature setting
L o 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 displayed.
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 setting mode returns to the temperature display mode automatically when 90 seconds has passed
without any key operation. In this case, any setting before pressing the set key (SET) is not memorized.
The key lock only works with the chamber temperature setting and the defrost key (DEF).
A key lock function becomes on when it is changed to Lo1 with a process 3.
REMOTE ALARM TERMINAL
WARNING
Always turn off the power switch and 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 lower left side of the unit. The alarm is outputted
from this terminal. Contact capacity is DC 30 V, 2 A.
between COM. and N.O. between COM. and N.C.
At normal Open Close
At abnormal Close Open
Note:
The alarm status of remote alarm terminal and audible alarm are cancelled by pressing the alarm buzzer
stop key (BUZZER) since the remote alarm is operated in conjunction with alarm buzzer (except for
power failure alarm status). The visual alarm will remain active until the alarm condition is rectified.

15
ALARMS FUNCTIONS
This unit has the alarm functions shown below.
Contact our sales representative or agent after moving the storage items to other refrigerator or freezer if
the alarm status continues because there is a possibility of any failure.
Alarm & Safety Situation Indication Alarm buzzer Remote alarm terminal
High temperature
alarm
If the chamber temperature deviates
by +10oC (factory set) from setting.
Alarm lamp is flashed.
Temperature display is
flashed.
Intermittent tone after
a delay of 15 minutes.
Remote alarm is activated
after a delay of 15 minutes.
Low temperature
alarm
If the chamber temperature deviates
by -10oC (factory set) from setting.
Alarm lamp is flashed.
Temperature display is
flashed.
Intermittent tone after
a delay of 15 minutes.
Remote alarm is activated
after a delay of 15 minutes.
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 blinks. Intermittent tone Remote alarm is activated.
Door alarm When the door is open. Door check lamp is lit. Intermittent tone after
a delay of 2 minutes. -----
The remote alarm terminal is in alarm status in conjunction with the alarm buzzer. However, the
alarm status of the remote alarm terminal is cancelled by pressing the alarm buzzer stop key (BUZZER).
SAFETY FUNCTIONS
This unit has the safety functions shown below.
Alarm & Safety Situation Indication, Alarm buzzer Safety operation
Auto return When there is no key pressing in
setting mode for 90 seconds. -----
Finishing of setting mode
and returning to the
temperature display mode.
Key lock When the key lock is ON (Lo1). ----- The change of temperature
setting is disable.

16
SELF DIAGNOSTIC FUNCTIONS
This unit has the self diagnostic functions shown below.
Contact our company sales representative or agent if an error code (ex. E01) is displayed resulting from
the self diagnostic.
Alarm & Safety Situation Indication Alarm buzzer Remote alarm terminal
Sensor
Abnormality
If the thermal sensor goes
open circuit.
Alarm lamp is flashed.
E01 and LO are displayed
alternately.
Intermittent tone Alarm status
If the thermal sensor goes
short circuit.
Alarm lamp is flashed.
E01 and HI are displayed
alternately.
If the defrost sensor goes
open circuit. Alarm lamp is flashed.
E02 and chamber temp. are
displayed alternately.
If the defrost sensor goes
short circuit.
If the compressor protection
temperature sensor is
disconnected. Alarm lamp is flashed.
E03 and chamber temp. are
displayed alternately.
If the compressor protection
temperature sensor is short
circuited.
Compressor temp.
Abnormality
In case of failure of compressor
cooling fan motor.
In case of abnormal high ambient
temperature. (when the
temperature about 103oC.)
Alarm lamp is flashed.
E10 and chamber temp. are
displayed alternately.
The remote alarm is cancelled by pressing the alarm buzzer stop key (BUZZER) since the remote
alarm is operated in conjunction with the buzzer, except for the power failure alarm status.
After a power failure, the unit will resume operation with the set value that was in place before power
failure occurred.
The chamber temperature is displayed for 5 seconds by pressing alarm buzzer stop key (BUZZER)
during power failure alarm. Then the buzzer is silenced. The alarm lamp keeps flashing.
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.
About 2-days operation of a freezer is necessary to full charge the battery.
Fan motor is expendable supplies. Replace them for about every 6 years. Contact our sales
representative or agent at the time of replacement of the fan motor.
Attach the inspection label of the accessories in front of the product, and use the repair time of the
battery and the fan motor.
The remote alarm terminal is in alarm status in conjunction with the alarm buzzer. However, the alarm
status of the remote alarm terminal is cancelled by pressing the alarm buzzer stop key (BUZZER).

17
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.
CAUTION
Always put on the dry gloves to protect the hands at the time of maintenance. No gloves may cause
cut of the finger by the edge or corner.
Cleaning of cabinet
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.
Wipe off the condensation on the exterior of the cabinet with a dry soft cloth.
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.
<Important>
■Never pour water onto or into the unit. Doing so can damage the electric insulation and cause failure.
■Always replace the accessories removed for the cleaning to keep the intended performance.
Cleaning of evaporating tray
CAUTION
Dispose of the water in the evaporating tray completely. Spilled water or splashed water may cause
current leakage or electric shock.
Clean the evaporating tray regularly. The dusty tray may cause poor evaporation.
This unit is provided with the evaporating tray on the
back.
1. Remove 4 screws of the fixing bracket.
2. Remove the evaporating tray and the fixing bracket.
3Wash the evaporating tray.
4. Fix the tray and the fixing bracket with 4 screws of
the fixing bracket
Evaporating tray
Screw
Fixing
bracket

18
MAINTENANCE
Defrosting
Use the scraper provided for removing the frost if the freezer operation must be continued. Pay attention
not to impact or damage the inner wall.
1. When defrosting, move all the contents of containers in the freezer to another low temperature freezer.
2. Pressing the defrost key (DEF) for more than five seconds to stop the refrigerating operation.
While the refrigerating operation is stopped, the current chamber temperature and dF is displayed on the
control panel alternately.
3. After a several hours, check the visually that all defrost was removed completely.
4. If a defroster is finished, a drain cap at bottom inside the freezer is removed.
Draw drain hose, and drain the water with water inside the freezer in the tray.
Wipe the water left in the freezer, and do the cap.
5. Pressing about 5 seconds the defrost key (DEF), the refrigerating operation can be started.
6. Once the chamber temperature has dropped to the desired temperature, place the original contents
back in the freezer chamber.
Note:
After the defrosting, the refrigerating is never resumed automatically.
Make sure to press the defrost key (DEF) for more than five seconds to start operation again.

19
TROUBLESHOOTING
If the unit malfunctions, check out the following before calling for service.
Malfunction Check/Remedy
The chamber is not cooled
at all
□The circuit breaker of power source is active.
□The voltage is too low? (In this case, call an electrician.)
□The power switch is not ON.
□The large amount of articles (load) is stored in the chamber at one time.
□The freezer is in defrost condition.
□It is using near the electric product which makes an electric wave occur.
The cooling is poor □The ambient temperature is too high.
□The door is not closed firmly.
□The large amount of frost is built on the chamber wall.
□The set temperature is not inputted properly.
□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.
□It is using near the electric product which makes an electric wave occur.
When the unit does not
accept changes of set-point
temperature
□The key lock is set in ON.
Noise □The freezer is not installed on the sturdy floor.
□The freezer is not leveled with the leveling feet.
□There is anything touching the frame.
□The freezer is in the status immediately after start up.
The unit sometimes causes a noise when the chamber temperature is high
due to the large load. The noise gets less and less accompanying with
the cooling of the chamber.
Note:
If the malfunction is not eliminated after checking the above items, or the malfunction is not shown in the
above table, contact our sales representative or agent.
Keep an electric product which emits an electric wave away from this product. A noise from an electric
wave may cause malfunction to this product.
A compressor is in this product about the top of the product. After the operation of the compressor stops,
it has the sound that refrigerant flows after several seconds. This makes the pressure of the compressor
decrease, and it is the sound which makes it drive at the time of the next movement with little energy.
This sound is not a problem.
CAUTION
The noise of refrigerant flow may be heard due to the characteristic of refrigerating circuit. Especially for
several minutes after start-up, the noise of motor compressor or refrigerant flow can be larger. But such
noise does not mean malfunction nor failure.