Sanyo MDF-U333 User manual

MDF-U333
MDF-U537
MDF-U537D
BIOMEDICAL FREEZER
INSTRUCTION MANUAL
MDF-U537/U537D

1
Note:
1. No part of this manual may be reproduced in any form without the expressed written
permission of SANYO.
2. The contents of this manual are subject to change without notice.
3. Please contact SANYO if any point in this manual is unclear or if there are any
inaccuracies.
SANYO Electric Biomedical Co., Ltd. All rights reserved. Printed in Japan.
CONTENTS
PRECAUTIONS FOR SAFE OPERATION P. 2
CAUTIONS FOR USAGE P. 6
ENVIRONMENTAL CONDITIONS P. 7
FREEZER COMPONENTS P. 8
INSTALLATION P. 11
OPTIONAL COMPONENTS P. 13
REMOTE ALARM TERMINAL P. 18
TEMPERATURE SETTING P. 19
ALARM & SAFETY FUNCTIONS P. 22
SETTING OF ALARM RESUME TIME P. 23
ROUTINE MAINTENANCE P. 24
TROUBLESHOOTING P. 25
DISPOSAL OF UNIT P. 25
SPECIFICATIONS P. 26
PERFORMANCE P. 27
SAFETY CHECK SHEET P. 28

2
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.

3
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. 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.
Use a dedicated power source as indicated on the rating label attached to the unit.
Remove dust from the power supply plug before inserting in a power source. A dusty plug or
improper insertion may cause a hazard.
Use a power supply outlet with ground (earth) 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.
Do not insert metal objects such as a pin or a wire into any vent, gap or any outlet for inner air
circulation. This may cause electric shock or injury by accidental contact with moving parts.
Never store volatile or flammable substances in this unit. This may cause explosion or fire.
Never store corrosive substances in this unit. This may lead to damage to the inner components
or electric 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.
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.
WARNING

4
PRECAUTIONS FOR SAFE OPERATION
Never splash water directly onto the unit as this may cause electric shock or short circuit.
Never disassemble, repair, or modify the unit yourself. Any such work carried out by an
unauthorized person may result in fire 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.
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.
Prepare a safety check sheet when you request any repair or maintenance for the safety of service
personnel.
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.
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.
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.
Never damage or break the power supply plug or cord. Do not use the supply plug if its cord
is loose. This may cause fire or electric shock.
Do not touch any electrical parts such as the power supply plug or any switches with a wet hand.
This may cause electric shock.
Do not put a container with water or heavy articles on the unit. It may cause injury if the articles
fall. Current leakage or electric shock may be resulted form the deterioration of insulation by spilled
water.
WARNING
CAUTION

5
PRECAUTIONS FOR SAFE OPERATION
Do not climb onto the unit or do not put articles on the unit. This may cause injury by tipping or
damage to the unit.
Put on dry gloves when you take out refrigerated articles from the freezer. Handing frozen
contents or the inside walls with naked bands may cause frostbite.
Do not defrost inside walls using a knife or ice pick. There are pipelines for cooling behind the
walls. Be careful not to damage the lines as this could cause a breakdown. Also, do not make a
hole in the wall for installation of attachments.
Hold the handle when closing the door. This will reduce the likelihood of a trapped finger.
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.
Be careful not to tip over the unit during movement to prevent damage or injury.
Disconnect the power plug when the unit is not used for long periods.
Do not put the packing plastic bag within reach of children as suffocation may result
Remove dust and clean the power supply plug periodically. The operation with a dusty plug may
cause fire.
CAUTION

6
CAUTIONS FOR USAGE
1. Sometimes the alarm may not operate at the time of first start-up. This does not mean malfunction.
It is due to the complete discharge of incorporated battery. 2-day continuous operation of the freezer is
necessary to charge the battery fully.
2. The digital thermometer of medical freezer is designed to display the temperature of the center part of
the freezing compartment. Although the thermometer sometimes displays a temperature a little bit
higher than the actual temperature of the center part, it gradually approaches the real temperature.
3. An access port to take out the measuring cable in the case is provided on the back or left side wall of
the freezer. Be sure to replace the cap and heat insulator after take out cable or, the inside temperature
cannot complete down, and frost may accumulate outside the port surroundings.
4. Do not use brushes, acids, benzine, thinners, powdered soap. Polishing powders, or hot water for
cleaning, as they can deteriorate the painted surfaces and parts made of plastic and rubber. Be
especially careful not to wipe plastic or rubber parts with volatile solvents such as benzine. Wipe up the
neutral detergents with a wet cloth when used.
5. Frost will accumulate on the inside walls of the freezer during use. Then remove the frost with the
spatula provided or a similar tool. Do not defrost inside walls using a knife or ice pick. There are
pipelines for cooling behind the walls. Be careful not to damage the lines as this could cause a
breakdown. Also, do not make a hole in the wall for installation of attachments.
6. The freezing temperature is different at each position inside the case of this freezer. The set
temperature represents the temperature at the center of the inside case. The refrigerated articles put on
the highest position part, are refrigerated higher than the set temperature, while those put on the lowest
part are refrigerated lower.
7. Do not put too many warm articles into a freezer compartment before enough operating. Put items in
a few at a time after the freezer compartment temperature has cooled to at least -20oC.
8. In the case of high ambient temperature, the cabinet front may heat up after the freezer starts to
operate first. However, this does not denote a malfunction. It is due to heater or hot gas piped around
the unit frame to prevent frost and ice sticking around the cabinet.

7
ENVIRONMENTAL CONDITIONS
This equipment is designed to be safe at least under the following conditions (based on the IEC 1010-1):
1. Indoor use;
2. Altitude up to 2000 m;
3. Ambient temperature 5oC to 40oC
4. Maximum relative humidity 80% for temperature up to 31oC decreasing linearly to 50% relative
humidity at 40oC;
5. Mains supply voltage fluctuations not to exceed ±10% of the nominal voltage;
6. Other supply voltage fluctuations as stated by the manufacturer;
7. Transient overvoltages according to Installation Categories (Overvoltage Categories) II; For mains
supply the minimum and normal category is II;
8. Pollution degree 2 in accordance with IEC 664.

8
FREEZER COMPONENTS
MDF-U537/U537D
1
6
MDF-U333
2
11
3
4
12
9
13
1
11
2
3
4
9
13
6
5
7
5
12
7
10
8
8

9
FREEZER COMPONENTS
1. Door: To open the door, grip the handle.
2. Handle: Always grip the handle to open the door.
3. Door latch: To lock the door, turn this latch downward. A padlock is also available.
4. Access port: This is used for leading the measuring cable from the freezing chamber to the outside.
MDF-U333 and MDF-U537 has one port and MDF-U537D has two.
5. Lock: By turning to 180 degree to counterclockwise with a key, the door can be locked.
6. Control panel: To display the temperature setting and running condition. See page 10 for details.
7. Caster: 4 casters are provided for easy movement. Separate the front 2 casters from the floor by
adjusting the leveling legs at the time of installation.
8. Defrost mark: When this is hidden by frost, defrost the freezer. Refer to page 23 for instructions.
9. Leveling foot: Serves to adjust the height and to settle the frame evenly.
10. Space for temperature recorder: An automatic temperature recorder (optional part) can be
attached here. See page 13 “Temperature recorder”.
11. Storage container: Made of styrol resin. Be careful not to damage the container by a metal
scraper at the time of defrosting.
12. Defrost water vessel & storage container: The container can be used to collect the defrosted
water when defrosting.
13. Remote alarm terminal: Used to notify an alarm condition of the unit to remote location. See
page 18 for details.
14. 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 1 month).
15. Power switch: Switch for the freezer. This switch also activates as an over-current breaker (15
A).
14
Back side
13
15

10
FREEZER COMPONENTS
Control panel and keypad
1. Alarm test key (ALARM TEST): Test key for alarm device. By pressing this key, the alarm lamp is
flashed, remote alarm is activated and buzzer sound. This means all alarm function operate correctly.
2. Buzzer stop key (BUZZER): To silence the audible alarm, press this key. The remote alarm is also
silenced by pressing this key. (The buzzer cannot be stopped during remote alarm testing.)
3. Defrost key (DEF): By pressing this key for 5 seconds, the refrigerating operation is stopped.
Pressing this key again after defrosting leads resumption of the operation.
Note: The refrigerating operation never resume automatically after defrosting.
4. Set key (SET): Temperature setting mode is led by pressing this key. Once the key is pressed, the
changeable digit is flashed. Pressing this key again after setting desired temperature, the setting is
stored into computer memory. If there is no key operation for 90 seconds during the temperature setting
mode, the temperature setting mode is invalid automatically. See page 19 for the details.
5. Digit shift key ( ): Pressing this key in the setting mode causes the changeable digit to shift. Key
lock is available by pressing this key for more than 5 seconds in the temperature display mode. Refer to
page 20 for the key lock.
6. 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 mode.
7. Alarm lamp (ALARM): This lamp is flashed when the audible alarm is activated.
8. Digital temperature indicator: This indicator shows the present chamber temperature or set
temperature.
9. Compartment select key (TOP/BOTTOM) (MDF-U537D only):By pressing this key, internal
temperature display of top compartment or bottom compartment and each setting is selected.
10. Top compartment lamp (TOP) (MDF-U537D only):This lamp lights when the top compartment is
selected.
11. Bottom compartment lamp (BOTTOM) (MDF-U537D only):This lamp lights when the bottom
compartment is selected.
1 2 3 4 5 6
7 81011
9
< MDF-U537D >

11
INSTALLATION
Installation site
To operate this unit properly and to obtain maximum performance, install the unit in a location with the
following conditions:
1. A location not subjected to direct sunlight
Installation in a location subjected to direct sunlight may lead to inadequate cooling.
2. A location with adequate ventilation
Leave at least 10 cm around the unit for ventilation. Poor ventilation will result in a reduction of the
refrigeration capacity.
Avoid direct cool airflow to the heat discharger on the back of the unit by an air-conditioning equipment.
The reduction of the refrigeration capacity will be resulted from the unbalance of heat discharge of
refrigerating circuit (MDF-U333).
3. A location away from heat generating sources
Avoid installing the unit near heat-emitting appliances such as gas ranges or stoves. Heat can cause
inefficient refrigeration.
4. A location with a sturdy and level floor
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.
5. A location without flammable or corrosive gas
WARNING
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.
6. A location not prone to high humidity
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.

12
INSTALLATION
Installation
1. Remove 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 neutral detergent and wipe it up with a wet cloth.
2. Adjust the leveling feet
Extend the leveling feet by rotating them
counterclockwise to contact them to the floor.
Ensure the unit is level.
3. Fix 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)
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
OPTIONAL COMPONENTS
Temperature recorder
WARNING
Always disconnect the power supply to the unit prior to attachment of a temperature recorder in
order to prevent electric shock or injury.
An automatic temperature recorders is available for the freezer as the optional component. The type of
the recorder is MTR-G85. For the attachment, the mounting kit is necessary.
Following shows the combination of recorder with the mounting kit:
Temperature recorder Mounting kit
MTR-G85 (circular chart type) MPR-S7 (for bottom mounting)
MDF-S740T (for top mounting)
In the case of top location
MTR-G85
MDF-S740T

14
OPTIONAL COMPONENTS
Model MDF-U333:The recorder is located on the top of the freezer.
1. Attach the recorder to the mounting kit by following
the procedure shown in the manual enclosed with the
mounting kit.
2. Fix the recorder on the top of the freezer by using 4
screws provided with the mounting kit.
3. Remove 2 rubber caps (outside and inside) on the
access port on the back of the freezer and also
remove the insulation in the port.
4. Pass the recorder sensor into the chamber through
the access port. See Fig. 1
5. Push the capillary tube of the recorder into the
vertical capillary tube cover on the back of the freezer.
6. After covering the recorder sensor with the cover
provided, fix the recorder sensor under the 2nd shelf
by using 2 enclosed binders. See Fig. 2.
7. Make a small cut on the rubber caps for capillary to
pass.
8. Replace the insulation into the access port and
cover the port completely with the rubber caps.
9. Remove the top cover of the freezer by unscrewing
6 screws. Fig. 3
10. Join the wire from the freezer and wire from the
recorder by using the enclosed connecting wire.
See Fig. 4.
11. Pass the wire through the hole on the top cover
and fix the top cover with screws. Make sure the
connector is under the top cover
11. Make a small cut on the rubber caps for wire to
pass and replace the rubber cap on the top cover.
12. Push in the wire into the recorder mounting kit to
accommodate the connector in it.
Fig. 3
Access port
Sensor
Top cover
Fig.4
Fig. 1
< Front >
< Back >
Recorder
Fig. 2

15
OPTIONAL COMPONENTS
Model MDF-U537: The recorder is located on the left lower front of the freezer.
1. Attach the recorder to the mounting kit by following
the procedure shown in the manual enclosed with the
mounting kit.
2. Remove the screw on the cover for the recorder
space on the lower front of the freezer. Open the
cover and push the shaft on the both sides outward to
remove the cover. Fig. 5
3. Install the recorder in the recorder space.
4. Join the wire in the unit compartment with the
recorder wire by each wire connector. See Fig. 6
5. Remove the wire grille on the back bottom of the
freezer. See Fig.7
6. Route the capillary tube of the recorder to the back
of the freezer through the unit compartment
7. Remove 2 rubber caps (outside and inside) on the
access port on the back of the freezer and also
remove the insulation in the port.
8. Pass the recorder sensor into the chamber through
the access port. Fig. 8
9. After covering the recorder sensor with the cover
provided, fix the recorder sensor under the 3rd shelf
by using 2 enclosed binders. See Fig. 9.
10. Make a small cut on the rubber caps for capillary
to pass.
11. Replace the insulation into the access port and
cover the port completely with the rubber caps.
Fig. 7
Sensor
Fig. 5
Fig. 6
Access port
Shaft
Fig. 8 Fig. 9

16
OPTIONAL COMPONENTS
Model MDF-U537D: The recorder is located on the top of the unit and on the left lower front of the
freezer because the upper and lower chamber is controlled independently.
< Attachment of MTR-G85 on the top of the freezer >
1. Attach the recorder to the mounting kit by following
the procedure shown in the manual enclosed with the
mounting kit.
2. Fix the recorder on the top of the freezer by using 4
screws provided with the mounting kit.
3. Remove 2 rubber caps (outside and inside) on the
access port on the back of the freezer and also
remove the insulation in the port.
4. Pass the recorder sensor into the chamber through
the access port. See Fig. 10
5. After covering the recorder sensor with the cover
provided, fix the recorder sensor under the 2nd shelf
by using 2 enclosed binders. See Fig. 11.
6. Make a small cut on the rubber caps for capillary to
pass.
7. Replace the insulation into the access port and
cover the port completely with the rubber caps.
8. Remove the top cover of the freezer by unscrewing
6 screws. Fig. 12
9. Join the wire from the freezer and wire from the
recorder by using the enclosed connecting wire.
See Fig. 13.
10. Pass the wire through the hole on the top cover
and fix the top cover with screws. Make sure the
connector is under the top cover
11. Make a small cut on the rubber caps for wire to
pass and replace the rubber cap on the top cover.
12. Push in the wire into the recorder mounting kit to
accommodate the connector in it.
Fig. 13
Sensor
Fig. 10
Top cover
< Front >
< Back >
Recorder
Access port
Fig. 12
Fig. 11

17
OPTIONAL COMPONENTS
Model MDF-U537D:
< Attachment of MTR-G85 on the left lower front of the freezer >
1. Attach the recorder to the mounting kit by following
the procedure shown in the manual enclosed with the
mounting kit.
2. Remove the screw on the cover for the recorder
space on the lower front of the freezer. Open the
cover and push the shaft on the both sides outward to
remove the cover. Fig. 14
3. Install the recorder in the recorder space.
4. Join the wire in the unit compartment with the
recorder wire by each wire connector. See Fig. 15
4. Remove the wire grille on the back bottom of the
freezer. See Fig. 16
5. Route the capillary tube of the recorder to the back
of the freezer through the unit compartment
6. Remove 2 rubber caps (outside and inside) on the
access port on the back of the freezer and also
remove the insulation in the port.
7. Pass the recorder sensor into the chamber through
the access port. Fig. 17
8. After covering the recorder sensor with the cover
provided, fix the recorder sensor under the middle
shelf by using 2 enclosed binders. See Fig. 18.
9. Make a small cut on the rubber caps for capillary to
pass.
10. Replace the insulation into the access port and
cover the port completely with the rubber caps.
Fig. 16
Sensor
Fig. 14
Fig. 15
Access port
Shaft
Fig. 17 Fig. 18

18
REMOTE ALARM TERMINAL
WARNING
Always disconnect the power supply cord before connecting an alarm device to the remote alarm
terminal.
The terminal of the remote alarm is installed at the back of the unit. The alarm is generated from this
terminal. Contact capacity is DC 30V, 2 A.
Contact output: At normal condition “Open”
At abnormal condition “Close
Note:
The remote alarm is silenced by pressing the BUZZER key as the remote alarm is operated in
conjunction with the buzzer except for the power failure alarm and alarm test.

19
TEMPERATURE SETTING
Chamber temperature
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 -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 plug to
exclusive power supply socket. ---- The current chamber temperature is displayed.
2 (MDF-U537D only) By pressing the compartment select
key, select the top compartment.
TOP
BOTTOM
Top compartment lamp lights and the
current chamber temperature of top
compartment is displayed.
3 Press SET key. SET The second digit of the temperature
indicator flashes.
4 Set the temperature to 25 with the digit shift key and the numeric
value shift key.
By pressing the key, settable digits
moves.
By pressing the key, the numerical value
of the settable digits increases.
5 Press SET key. SET When pressed, the figure of settable
digit increases.
6 By pressing the compartment select
key, select the bottom
compartment. (MDF-U537D only) TOP
BOTTOM Set temperature is memorized and the current chamber temperature is displayed.
7
(MDF-U537D only)
Perform the same operation as in the case of steps
3 to 5, and set the temperature for the bottom
compartment.
The chamber temperature setting is stored, and the
current chamber temperature is displayed.
Note:
Although the value of the chamber temperature setting can range from -18oC to -40oC, the guaranteed
temperature when there is no load is -30oC when the external temperature is 30oC.
Note that defrosting of this unit is started manually (by pressing the DEF key for about 5 seconds) and
stopped manually.