Phcbi MDF-DU700VH User manual

MDF-DU700VH
MDF-DU500VH
Please read the operating instructions carefully before using this product, and keep the operating
instructions for future use.
See page 42 for model number.
Operating Instructions
Ultra-Low Temperature Freezer
MDF-DU700VH

1
CONTENTS
INTRODUCTION P. 2
PRECAUTIONS FOR SAFE OPERATION P. 3
LABELS ON THE UNIT P. 7
SYMBOLS ON THE UNIT P. 7
ENVIRONMENTAL CONDITIONS P. 8
INTENDED USE AND PRECAUTIONS P. 8
FREEZER COMPONENTS P. 9
Control panel P.11
INSTALLATION SITE P.12
INSTALLATION P.13
START-UP OF UNIT P.14
CHAMBER TEMPERATURE SETTING P.15
KEY LOCK FUNCTION P.15
ALARM TEMPERATURE SETTING P.16
SETTING OF ALARM RESUME TIME P.17
SETTING OF COMPRESSOR DELAY TIME P.18
SETTING OF DOOR ALARM DELAY TIME P.19
REMOTE ALARM TERMINAL P.20
AIR INTAKE PORT P.20
MONITOR OF FREEZER STATUS P.21
ALARMS & SAFETY FUNCTIONS P.22
ROUTINE MAINTENANCE P.23
Cleaning of cabinet P.23
Cleaning of condenser filter P.23
Defrosting of inside wall P.24
Cleaning of air intake port P.25
CALIBRATION P.25
REPLACEMENT OF WEAR-OUT PARTS P.26
Replacement of battery for power failure alarm P.26
Replacement of fan motor P.26
TROUBLESHOOTING P.27
DISPOSAL OF UNIT P.28
Recycle of battery P.28
Decontamination of unit P.28
TEMPERATURE RECORDER (OPTION) P.33
Setting of MTR-85H P.33
Setting of MTR-G85C P.35
BACKUP COOLING KIT (OPTION) P.37
SMALL INNER DOOR (OPTION) P.39
INTERFACE BOARD (OPTION) P.39
Installation of MTR-480 P.39
INVENTORY RACK (OPTION) P.40
SPECIFICATIONS P.41
PERFORMANCE P.42
SAFETY CHECK SHEET P.43

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 a service personnel only.
WARNING
As with any equipment that uses CO2gas, there is a likelihood of oxygen depletion in the vicinity
of the equipment. It is important that you assess the work site to ensure there is suitable and
sufficient ventilation. If 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 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 with a key.
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.
Flammable and explosive product. This product contains flammable refrigerant. Do not damage
or break the pipework.
This product contains flammable refrigerant. Well ventilate the room to prevent refrigerant
accumulation.
Do not place this unit in a location where it is difficult to disconnect the power supply plug.
Failure to disconnect the power supply plug may cause fire in the event of a problem or malfunction.
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.
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 (copy the last page) when you request any repair or maintenance for
the safety of service personnel.
CAUTION

7
LABELS ON THE UNIT
Warning safety labels applied to the ultra-low temperature 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 ultra-low temperature freezer.
Possible
Danger
Warning/Caution Type
Location of Danger
Warning/Caution Label Description of Danger
Personal
injury
Hazardous Latch
Latch
Dangerous to put a hand.
Personal
injury
Frostbite and frost
Interior
Frostbite and frost caution label.
Personal
injury
Flammable and
explosive product
Interior
Flammable refrigerant label.
Sample
damage
Chamber temperature
Interior
Forgets to close a door and latch.
Sample
damage
Chamber temperature
Interior
Rise in temperature is prevented.
Personal
injury
Negative pressure
release
Interior
Door cannot open.
SYMBOLS ON THE 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 an earth.
This symbol means “ON” for a power switch.
This symbol means “OFF” for a power switch.

8
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 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 (POLUTION DEGREE 2 in most cases)
INTENDED USE AND PRECAUTIONS
This equipment is designed for low temperature storage of human cells, organs, plasma and DNAs.
■The effective storage period depends on the sample condition and storage temperature. It is
necessary to determine the storage temperature and period suitable for the purpose.
■For the live cells, the lower storage temperature should be required for long term storage. It is
recommended to store the live cells at -130 oC or lower.

9
FREEZER COMPONENTS
Rear side
11(inside)
7 (inside)
1
2
3
6
8
12
7
4
9
10
13
5
17
18
16
15
Power cord
14
<MDF-DU700VH>

10
FREEZER COMPONENTS
1. Control panel (on the upper front of the outer door): The current chamber temperature or set
temperature is displayed. See page 11 for details.
2. Outer door: To open the outer door, grip the outer door latch. On closing, lock the outer door latch
completely.
3. Inner door: The operation of the inner door should be quick to minimize the temperature rise in
chamber. Lock the inner door latch completely when the inner door is closed. The inner door is
removable for cleaning or defrosting. See page 24 “Routine maintenance”.
4. Outer door latch: Always lock the outer door latch when the outer door is closed. A padlock is also
available.
5. Inner door latch: Always lock the inner door latch when the inner door is closed.
6. Magnetic door gasket: This provides a tight door seal and prevents cold air leak. Keep clean.
7. Access port (rear and bottom): This is used for leading a cable and sensor of a measuring
equipment, or nozzle of backup cooling kit to chamber.
Replace the cap and insulation after using the access port. Improper replacement may cause poor
cooling or condensation around the outside of access port.
8. Air intake vent (grille): Do not block this vent to keep the proper cooling performance.
9. Leveling foot: The height of the freezer can be adjusted by this screw type leveling foot. Keep the
unit in level at the installation.
10. Caster: 4 casters are provided to facilitate moving of the cabinet. For the installation, adjust the
leveling feet so that the front 2 casters cannot contact with the floor.
11. Condenser filter (behind the grille): This filter prevents the dust from accumulating on the
condenser. The dusty condenser filter may cause failure of refrigerating device. Clean the condenser
filter once a month. See page 23 “Routine maintenance” for the cleaning.
12. Space for temperature recorder: A temperature recorder (optional component) can be attached
here. See page 33“ Temperature recorder (Option)”.
13. Keyhole: Turn counterclockwise to 180owith a key and the outer door is securely locked.
14. Air intake port: Used for open the outer door immediately after closing the outer door. See page 20
for details.
15. Fixture (on back side): 2 fixtures are provided as spacers between the cabinet and wall and also
serve as hooks to fix the unit. See page 13 “Installation”.
16. Power switch: This is for turning ON/OFF the power to the unit.
17. Remote alarm terminal: This is used to notice an alarm condition of the unit to remote location.
Refer to page 20 “Remote alarm terminal”.
18. Battery switch: This is a switch for a battery for power failure alarm. Normally, turn on this switch.
Be sure to turn off this switch if the freezer is not in operating for the long period (over one month).
NOTE:
3 shelves are packaged at the bottom of the chamber. Set the shelves on the shelf stoppers at the
standard location firmly. The upward edge should be upside.
Refer to page 40 for the attachment of shelf stopper when changing the location of shelf stopper.

11
1 32 654
12 11 10 9 8 7
FREEZER COMPONENTS
Control panel
1. Digital temperature indicator: This indicator shows the present chamber temperature or set
temperature. An error code will be displayed when the self diagnostic function detects any abnormality.
2. Status monitor lamp (STATUS): This lamp lights when environmental condition or status gets
worse or the unit is out of normal operation. Refer to page 21 for details.
3. Battery check lamp (BATTERY): This lamp lights to recommend the battery replacement (3 years
after power switch on). This lamp blinks to recommend the fan motor replacement (6 years after power
switch on). For the replacement, consult our sales representative or agent.
4. Door check lamp (DOOR): This lamp lights when the outer door is open.
5. Alarm lamp (ALARM): This lamp is flashed during alarm condition.
6. Filter check lamp (FILTER): This lamp lights when the excessive dust is accumulated on the
condenser filter. When this lamp lights, clean the condenser filter following the procedure on page 23.
7. Numerical value shift key ( ): Pressing this key in the setting 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. By
pressing this key for more than 5 seconds in the temperature display mode leads setting mode for alarm
temperature, alarm resume time ,compressor delay time and door alarm delay time. Refer to page 16,
17,18 and 19 for details respectively.
8. Digit shift key ( ): Pressing this key in the setting 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 15 for details.
9. Set key (SET): Chamber temperature setting mode is led by pressing this key and the changeable
digit blinks. By pressing this key again, the setting is memorized.
10. Status key (STATUS): By pressing this key in the event of the status monitor lamp is ON, the status
code is displayed on the digital temperature indicator. This key is not effective when the freezer is
running normally. See page 21 for details.
11. 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.
12. Buzzer stop key (BUZZER): To silence the audible alarm under alarm condition, press this key.
For the remote alarm, refer to page 20.
“temperature display mode”: the status which the digital temperature indicator shows the current
chamber temperature
“setting mode”; the status which the digital temperature indicator is ready to be entered after pressing
the numerical value shift key for 5 seconds.

12
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. Keep at least 30 cm at the left side for cleaning the air intake
port.
■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 +30oC.
■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.

13
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.
Note:
Remove the cable tie banding the power supply cord. Prolonged banding may cause the corrosion of
the cord coating.
2. Adjusting the leveling foot
Extend the leveling feet by rotating them as shown in Fig. 1 to contact them to the floor. Ensure the unit
is level.
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. (Fig. 2)
4. Setting the shelves
3 shelves are packaged at the bottom of the chamber. Set the shelves on the shelf stoppers at the
standard location firmly. The upward edge should be upside.
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.
6. Installing the earth leakage breakers
This product is to connect a earth leakage breaker to the power supply side of the product.
Contact our sales representative or agent at the time of installation of the earth leakage breaker.
Fixture Fig. 2
Fig.1
Leveling foot

14
START-UP OF UNIT
Follow the procedures for the initial and consequent operations of the unit.
1. Turn off the switch of the backup cooling kit (optional component) if it is installed. And check the
battery switch is off.
2. Connect the power cord to the dedicated outlet having appropriate rating with the chamber empty, and
turn on the power switch on the freezer.
3. Turn on the battery switch.
4. Set the chamber temperature to the desired temperature. At the initial start-up, the alarm lamp
(ALARM) blinks until the chamber temperature reaches the desired temperature. The alarm lamp
(ALARM) is off when the chamber temperature reaches around the set temperature.
5. Check that the chamber temperature reaches the desired temperature.
6. Turn on the switch of the backup cooling kit (optional component) if it is installed.
7. Check that the alarm lamp blinks and the buzzer sounds by pressing the alarm test key (ALARM
TEST). The remote alarm is also operated.
Note: The alarm lamp (ALARM) blinks and E09 is displayed when pressing the alarm test key (ALARM
TEST) with the battery switch off.
8. After confirming the above, you can put articles into the chamber in a small batch to prevent the
temperature rise.
9. Push the test switch to check the operation of backup cooling kit (option goods) when it is equipped.
NOTE:
Do not put too many warm articles in the chamber. The temperature rise may cause the damage to the
articles in the chamber.
WARNING
Fix the shelves securely. Incomplete installation may cause injury or damage.
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. Push the buzzer stop key (BUZZER) to silence buzzer and take appropriate actions if
needed.
WARNING
When this product operates at the first start-up or after no use for long period, the built-in battery capacity
may be lowered or completely zero because of discharge of the battery. After installation the product,
the freezer should operate for more than 3 days (72 hours) to charge the battery.

15
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 -75oC.
Note: The chamber temperature is set to -80oC at the factory.
Table 1. Basic operation sequence (Example: Chamber temperature -75oC)
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 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.
Although the value of the chamber temperature setting can range from -50oC to -90oC, the guaranteed
temperature is -86oC when there is no load at the ambient temperature of 30oC.
The setting mode returns to the temperature display mode automatically when 90 seconds has passed
without any key operation (auto-return function). In this case, the setting is not accepted.
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 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 (auto-return function). In this case, the setting is not accepted.

16
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 setting range of alarm temperature is between the chamber temperature ±5oC and ±40oC.
The following procedure shows the setting of alarm temperature according to the condition below:
High temperature alarm: activates at the temperature 5oC higher than the set temperature
Low temperature alarm: activates at the temperature 5oC lower than the set temperature
Note: The alarm temperature is set 10oC higher than the set temperature at the factory.
Table 3. Procedure for setting high temperature alarm
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. 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 figure of settable
digit changes.
When pressed, the changeable digit
is shifted.
6 Press set key. SET
Alarm temperature is memorized and
the current chamber temperature is
displayed.
Note: The alarm temperature is set 10oC lower than the set temperature at the factory.
Table 4. Procedure for setting low temperature alarm
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. 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 figure of settable
digit changes.
When pressed, the changeable digit
is shifted.
6 Press set key. SET
Alarm temperature is memorized and
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 (auto-return function). In this case, the setting is not accepted.

17
SETTING OF ALARM RESUME TIME
The alarm buzzer is silenced by pressing alarm buzzer stop key (BUZZER) on the control panel during
alarm condition.
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 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
5 seconds. The first digit is flashed.
3
Set the figure to F25 with the digit
shift key and numerical value shift
key.
The settable digit is shifted.
When pressed, the figure of settable
digit changes.
4 Press set key. SET The current resume time is displayed.
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
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 resume 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 mode returns to the temperature display mode automatically when 90 seconds has passed
without any key operation (auto-return function). In this case, the setting is not accepted..

18
SETTING OF COMPRESSOR DELAY TIME
The delay time of compressor can be changed to reduce the load on the power line and to facilitate the
start-up (reset) of the freezer after power failure.
The example in the table 6 is based on the assumption that the delay time is changed to 4 minutes.
Note: The delay time is set in 3 minutes at the factory.
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
5 seconds.
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 delay time is displayed.
The first digit is flashed.
5 Set the figure to 004 with the
numerical value shift key. When pressed, the figure of the first
digit changes.
6 Press set key. SET
The delay time is memorized and
the current chamber temperature is
displayed.
The setting range of the delay time is 3 minutes to 15 minutes. Chamber temperature may not fall
down if the delay time is set in 5 minutes or more depending on the installation environment.
The setting mode returns to the temperature display mode automatically when 90 seconds has passed
without any key operation (auto-return function). In this case, the setting is not accepted.