Phcbi MDF-C8V1 User manual

MDF-C8V1Series
Please read the operating instructions carefully before using this product, and keep the operating
instructions for future use.
See page 34 for all model numbers.
Operating Instructions
Ultra-Low Temperature Freezer

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
FUNCTION MODE P. 15
ALARM TEMPERATURE SETTING P. 15
SETTING OF ALARM RESUME TIME P. 17
CHANAGE OF COMPRESSOR DELAY TIME P. 18
REMOTE ALARM TERMINAL P. 19
ALARMS & SAFETY FUNCTIONS P. 20
ROUTINE MAINTENANCE P. 21
Cleaning of cabinet P. 21
Defrosting P. 21
Battery P. 22
TROUBLESHOOTING P. 23
DISPOSAL OF UNIT P. 24
Recycle of battery P. 24
Decontamination of unit P. 24
DISPOSAL OF BATTERY P. 29
TEMPERATURE RECORDER (OPTION) P. 30
BACKUP COOLING KIT (OPTION) P. 31
SPECIFICATIONS P. 33
PERFORMANCE P. 34
SAFETY CHECK SHEET P. 35

2
INTRODUCTION
■Read the operating instructions carefully before using the product and follow the instructions for safe
operation.
■PHC Corporation takes no responsibility for safety if the product is not used as intended or is used with
any procedures other than those given in the operating instructions.
■Keep the operating instructions in a suitable place so that they can be referred to as necessary.
■The operating instructions are subject to change without notice for improvement of performance or
function.
■Contact our sales representative or agent if any page of the operating instructions is lost or the page
order is incorrect, or if the instructions are unclear or inaccurate.
■No part of the operating instructions may be reproduced in any form without the express written
permission of PHC Corporation.
IMPORTANT NOTICE
PHC Corporation guarantees this product under certain warranty conditions. However, please note that
PHC Corporation shall not be responsible for any loss or damage to the contents of the product.

3
PRECAUTIONS FOR SAFE OPERATION
It is imperative that the user complies with the operating instructions
as it contains important safety advice.
Items and procedures are described so that you can use this unit correctly and safely.
If the precautions advised are followed, this will prevent possible injury to the user and
any other person.
Precautions are illustrated in the following way:
WARNING
Failure to observe WARNING signs could result in a hazard to personnel
possibly resulting in serious injury or death.
CAUTION
Failure to observe CAUTION signs could result in injury to personnel and
damage to the unit and associated property.
Symbol shows;
This symbol means caution.
This symbol means an action is prohibited.
This symbol means an instruction must be followed.
Be sure to keep the operating instructions in a place accessible to users of this unit.
< Label on the unit >
This mark is labeled on the cover in which the electrical components of high voltage
are enclosed to prevent the electric shock.
The cover should be removed by a qualified engineer or service personnel only.
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 power supply cord if its plug is loose. Such power supply cord may cause fire or
electric shock.
Never disassemble, repair, or modify the unit yourself. Any such work carried out by an
unauthorized person may result in fire, or electric shock or injury due to a malfunction.
Disconnect the power supply plug if there is something wrong with the unit. Continued
abnormal operation may cause electric shock or fire.
When removing the power supply plug from the power supply outlet, grip the power supply
plug, not the cord. Pulling the cord may result in electric shock or fire by short circuit.
Disconnect the power supply plug before moving the unit. Take care not to damage the power
supply cord. A damaged cord may cause electric shock or fire.
Disconnect the power supply plug when the unit is not used for long periods. Keeping the
connection may cause electric shock, current leakage, or fire due to the deterioration of insulation.
If the unit is to be stored unused in an unsupervised area for an extended period, ensure that
children do not have access and that 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.
Do not position this unit and the other unit so that it is difficult to operate the disconnection of
the power supply plug. Failure to disconnect the power supply plug may cause fire if there is
something wrong with the unit.
Flammable and explosive product. This product contains flammable refrigerant. Do not damage
or break the pipework.
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 oC to 40 oC;
■Maximum relative humidity 80 % for temperature up to 31 o
C decreasing linearly to 50 % relative
humidity at 40 oC;
■Mains supply voltage fluctuations up to ±10 % of the nominal voltage;
■Transient overvoltages up to the levels of OVERVOLTAGE CATEGORY II;
■Temporary OVERVOLTAGES occurring on the mains supply;
■Applicable pollution degree of the intended environment (POLUTION DEGREE 2 in most cases)

8
FREEZER COMPONENTS
1 2
3
10
9 8
5
4
6
7
11
12
5
14
13
15

9
FREEZER COMPONENTS
1. Lock: By turning to 180 degree to clockwise with a key, the door can be locked.
2. Door: Hinged type. To open the door, grip the handle.
3. Door gasket: Seals the door and prevents leakage of cold air.
4. Inner lid: Serves as a means of reducing cold air leakage when the door is open. Remove the frost
regularly.
5. Access port: Located on the back side and bottom. These are used for leading the measuring
cable from the freezing chamber to the outside. The bottom port is also used for passing the
temperature sensor.
6. Space for temperature recorder: A temperature recorder (optional part) can be attached here.
See page 30 “Temperature recorder (option)”.
7. Control panel: To display the temperature setting and running condition. See page 10 for details.
8. Intake air vent: Be careful not to block this.
9. Leveling foot: These are screw bolts used to install and fix the unit. Adjust the height of the leveling
feet by turning the screw bolts until 2 front casters are away from the floor.
10. Caster: 4 casters are provided for easy movement.
11. Fixture (back side): A fixture is attached to the rear of the frame. Fix the frame to the wall with
this fixture and rope or chain.
12. Remote alarm terminal (back side): Used to notify an alarm condition of the unit to remote
location. See page 19 for details.
13. Battery switch (back side): 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 1 month).
14. Space for optional component: An interface board (optional component) can be attached here.
15. Power switch: This is for turning ON/OFF the power to the unit.

10
FREEZER COMPONENTS
Control panel
1. Digital temperature indicator (TEMPERATURE): This indicator shows the present chamber
temperature or set temperature.
2. Battery check lamp (BATTERY): This lamp lights to recommend the battery replacement. For the
replacement, consult our sales representative or agent.
3. Alarm lamp (ALARM): This lamp is flashed during alarm condition.
4. 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 five 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 15,16,17 and 18 for details respectively.
5. 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.
6. Set key (SET): Temperature setting mode is led by pressing this key and the changeable digit is
flashed. By pressing this key again, the setting is memorized. The set mode returns to the
temperature display mode automatically when 90 seconds has passed without any key operation. Refer
to page 14 “Chamber temperature setting” for the details.
7. 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.
8. Buzzer stop key (BUZZER): To silence the audible alarm, press this key. The alarm during the
alarm test cannot be silenced by pressing this key.
3
21
8 7 6 5 4

11
INSTALLATION SITE
To operate this unit properly and to obtain maximum performance, install the unit in a location with the
following conditions:
■A location not subjected to direct sunlight
Do not install the unit under direct sunlight. Installation in a location subjected to direct sunlight cannot
obtain the intended performance.
■A location with adequate ventilation
Leave at least 10 cm around the unit for ventilation. Poor ventilation will result in a reduction of the
performance and consequently the failure.
■A location away from heat generating sources
Avoid installing the unit near heat-emitting appliances such as a heater or a boiler etc. Heat can
decrease the intended performance of the unit.
■A location with little temperature change
Install the unit under stable ambient temperature. The allowable ambient temperature is between 5 oC
and 30 oC.
■A location with a sturdy and level floor
Always install the unit on a sturdy and level floor. The uneven floor or tilted installation may cause
failure or injury. Install the unit in stable condition to avoid the vibration or noise. Unstable condition
may cause vibration or noise.
WARNING
Install the unit on a sturdy floor. If the floor is not strong enough or the installation site is not
adequate, this may result in injury from the unit falling or tipping over.
Select a level and sturdy floor for installation. This precaution will prevent the unit from tipping.
Improper installation may result in water spillage or injury from the unit tipping over.
■A location not prone to high humidity
Install the unit in the ambient of 80 %R.H. or less humidity. Installation under high humidity may cause
current leakage or electric shock.
WARNING
Do not use the unit outdoors. Current leakage or electric shock may result if the unit is exposed to
rain water.
Never install the unit in a humid place or a place where it is likely to be splashed by water.
Deterioration of the insulation may result which could cause current leakage or electric shock.
■A location without flammable or corrosive gas
Never install the unit in a location where it will be exposed to flammable or corrosive gas. This may
cause explosion or fire or may result in the current leakage or electric shock by the corrosion of the
electrical components.
■A location without the possibility of anything fall
Avoid installing the unit in the location where anything can fall down onto the unit. This may cause the
breakdown or failure of the unit.

12
INSTALLATION
1. Removing the packaging materials and tapes
Remove all transportation packaging materials and tapes. Open the 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
Stretch the leveling feet by rotating them to contact them to
the floor. Ensure the unit is installed horizontally and the
casters are not in contact with the floor.
3. Fixing the unit
A fixture is attached to the rear of the frame. Fix the
frame to the wall with this fixture and rope or chain.
4. Ground (earth)
The ground (earth) is for preventing the electric shock in the case of unexpected deterioration of the
electrical insulation. Always ground the unit at the time of installation.
WARNING
Use a power supply outlet with ground (earth) to prevent electric shock. If the power supply outlet is
not grounded, it is necessary to install a ground by qualified engineers.
Never ground the unit through a gas pipe, water main, telephone line or lightning rod. Such
grounding may cause electric shock in the case of an incomplete circuit.
Leveling foot

13
START-UP OF UNIT
Use the following procedure to start trial operation or actual operation of the unit.
1. Check that the power switch and battery switch are OFF.
2. Turn off the power switch of the Backup cooling kit (optional component) if it is installed.
3. Connect the power supply cord to the dedicated outlet having appropriate rating with the chamber
empty.
4. Turn on the power switch.
Note:
The buzzer operates until the chamber temperature reaches the set temperature if the power switch is
turned on with the battery switch is ON.
5. Turn on the battery switch.
6. Set the chamber temperature to the desired temperature.
7. Check that the chamber temperature reaches the desired temperature.
8. Turn on the power switch of the Backup cooling kit (optional component) if it is installed.
9. Press the alarm test key (ALARM TEST) and check that the alarm lamp blinks and buzzer activates.
10. After confirming the above, you can put articles into the freezer chamber in a small batch to prevent
the temperature rise.
Operation after power failure
The settings (chamber temperature, alarm temperature) are memorized by nonvolatile memory during the
power failure. Accordingly, the freezer resumes the operation with setting before power failure.
Note:
In some cases, the condensing fan may not operate to improve the cooling performance. This does not
mean the malfunction.
At the start-up: the fan starts to run with more than 30 minutes delay when the ambient temperature is
lower than 20 oC.
During the normal operation: the fan may not operate when the ambient temperature is lower than 20 oC.

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 oC.
Note: The chamber temperature is set to -80 oC at the factory.
Table 1 Basic operation sequence (Example: Chamber temperature -75 oC)
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.
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 -55 oC to -90 oC, the guaranteed
temperature range with no load is between -60 oC and -80 oC when the ambient temperature is 30 oC.
KEY LOCK FUNCTION
This unit is provided with the key lock function. When the key lock is ON, change of temperature setting
through the key pad is not available. The key lock is set to 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 key lock set mode returns to the temperature display area mode automatically when 90 seconds
has passed without any key operation.

15
FUNCTION MODE
This unit has the following function mode.
Indication Mode Settable range
F01 Setting of high temperature alarm Between 5 oC and 20 oC higher than the
chamber set temperature (1 oC gradient)
F02 Setting of low temperature alarm Between -5 oC and -20 oC lower than the
chamber set temperature (1 oC gradient)
F05 Setting of compressor delay time Between 3 and 15 minutes
(1 minute gradient)
F25 Setting of alarm resume time 0 or between 10 and 60 minutes
(10-minute gradient)
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 oC higher than the chamber set temperature
Low temperature alarm: activates at the temperature 5 oC lower than the chamber set temperature
Note:
The alarm temperature is set at the factory 10 oC higher than the chamber set temperature.
The available range of high temperature alarm is between 5 oC and 20 oC higher than the chamber set
temperature.
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
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 first digit is flashed.
5
Scroll the figure to 005 with 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 alarm temperature set mode returns to the temperature display area mode automatically when 90
seconds has passed without any key operation.

16
ALARM TEMPERATURE SETTING
Note:
The alarm temperature is set at the factory 10 oC lower than the chamber set temperature.
The available range of low temperature alarm is between 5 oC and 20 oC lower than the chamber set
temperature.
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
5 seconds.
The right 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 first digit is flashed.
5
Scroll the figure to -05 with 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 alarm temperature set mode returns to the temperature display area mode automatically when 90
seconds has passed without any key operation.

17
SETTING OF ALARM RESUME TIME
The buzzer is silenced by pressing buzzer stop key (BUZZER) key on the control panel during alarm
condition (The remote alarm cannot stopped.). However, if the alarm condition is continued after the
“alarm resume time” has passed, the buzzer sounds again. It is possible to change the alarm resume
time by the procedure shown in the Table.5.
The example in the table is based on the assumption that the desired duration is 20 minutes.
Note: Factory setting; 30.
Table 5 Setting procedure for alarm resume time (change from 30 minutes to 20 minutes)
Description of operation Key operated Indication after operation
1 ---- The current chamber temperature is
displayed.
2 Press numerical value shift key for
5 seconds. The first digit is flashed.
3
Set the figure to F25 with the
digit shift key and numerical value
shift key.
When pressed, the changeable digit
is shifted.
When pressed, the figure of settable
digit changes.
4 Press set key. SET The current setting is displayed.
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
Alarm resume time 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
new setting is effective on the next alarm condition.
■The setting cannot be changed during power failure.
■The remote alarm during power failure or buzzer and remote alarm during alarm test cannot be
silenced.
■The alarm resume time set mode returns to the temperature display area mode automatically when 90
seconds has passed without any key operation.

18
CHANGE OF COMPRESSOR DELAY TIME
The delay time of the 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 is based on the assumption that the delay time is changed to 4 minutes.
The delay time is set in 3 minutes at the factory.
Note:
■The setting range for delay time is between 3 and 15 minutes. The cool down of chamber temperature
may be slow when the setting of delay time is over 5 minutes, depending on the installation environment.
There is no need of changing the delay time when the capacity of power source is adequate.
Table 6. Changing procedure for delay time (change from 3 minutes to 4 minutes)
Description of operation Key operated Indication after operation
1 ---- The current chamber temperature is
displayed.
2 Press numerical value shift key for
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 compressor starts to run with the delay time when the power supply cord is connected to the outlet
or after power failure.
■The compressor delay time set mode returns to the temperature display area mode automatically when
90 seconds has passed without any key operation.