Sanyo MDF-U54V, MDF-U54VC, MDF-U74VC, MDF-U74V Service Manual

INSTRUCTION MANUAL

MDF-U74 MDF-U74VC

Ultra-Low Temperature Freezer

MDF-U54V MDF-U54VC

MDF-U74V

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CONTENTS

INTRODUCTION P. 2 PRECAUTIONS FOR SAFE OPERATION P. 3 ENVIRONMENTAL CONDITIONS P. 7 FREEZER COMPONENTS P. 8 Control panel P. 10 INSTALLATION SITE P. 11 INSTALLATION P. 12 START-UP OF UNIT P. 13 CHAMBER TEMPERATURE SETTING P.14 KEY LOCK FUNCTION P. 14 ALARM TEMPERATURE SETTING P. 15 SETTING OF ALARM RESUME TIME P. 16 REMOTE ALARM TERMINAL P. 17 MONITOR OF FREEZER STATUS P. 18 CHANGE OF COMPRESSOR DELAY TIME P. 19 CHANGE OF DOOR ALARM DELAY TIME P. 20 ALARMS & SAFETY FUNCTIONS P. 21 ROUTINE MAINTENANCE Cleaning of cabinet P. 22 Cleaning of condenser filter P. 22 Defrosting of inside wall P. 23 TROUBLESHOOTING P. 24 REPLACEMENT OF BATTERY P. 25 DISPOSAL OF UNIT P. 26 Recycle of battery P. 26 TEMPERATURE RECORDER (OPTION) P. 31 BACK-UP SYSTEM (OPTION) P. 32 INNER DOOR (OPTION) P. 33 DRAWER (OPTION) P. 33 MOUNTING OF INTERFACE BOARD (OPTION) P. 34 MOUNTING OF LAN INTERFACE BOARD (OPTION) P. 35 INVENTORY RACK (OPTION) P. 36 SPECIFICATIONS P. 37 PERFORMANCE P. 39 SAFETY CHECK SHEET P. 40

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INTRODUCTION

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

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

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

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

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

performance or functions.

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

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

inaccuracies.

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

CAUTION

SANYO guarantees the product under certain warranty conditions. SANYO in no way shall be responsible for any loss of content or damage of content.

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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.

㩷

this symbol means an action is prohibited.

㩷

this symbol means an instruction must be followed.

㩷

Be sure to keep this manual in a place accessible to users of this unit.

Some warning and/or caution labels are attached on the unit. Following shows the description of such labels.

This label is 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.

This symbol means attention or refer to document.

This symbol means earth.

This symbol means power switch “ON”.

This symbol means power switch “OFF”.

WARNING

As with any equipment that uses CO2 gas, there is a likelihood of oxygen depletion in the vicinity of the equipment. It is important that you assess the work site to ensure there is suitable and sufficient ventilation. If restricted ventilation is suspected, then other methods of ensuring a safe environment must be considered. These may include atmosphere monitoring and warning devices.

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PRECAUTIONS FOR SAFE OPERATION

WARNING

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.

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PRECAUTIONS FOR SAFE OPERATION

WARNING

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.

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PRECAUTIONS FOR SAFE OPERATION

CAUTION

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.

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ENVIRONMENTAL CONDITIONS

This equipment is designed to be safe at least under the following conditions (based on the IEC 61010-1):

Ŷ Indoor use;

Ŷ Altitude up to 2000 m;

Ŷ Ambient temperature 5

Ŷ Maximum relative humidity 80% for temperature up to 31

at 40

Ŷ Mains supply voltage fluctuations not to exceed 㫧10% of the nominal voltage;

Ŷ Other supply voltage fluctuations as stated by the manufacturer;

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

supply the minimum and normal category is II;

Ŷ Pollution degree 2 in accordance with IEC 60664.

C to 40oC

C decreasing linearly to 50% relative humidity

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FREEZER COMPONENTS

7 (inside)

11(inside)

Power cord

Rear side

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FREEZER COMPONENTS

1. Control panel (on the upper front of the door): Used for temperature setting and indication of

operating status is displayed on the panel. See page 10 for details.

2. Outer door: To open the door, grip the handle. 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 door is closed. The door is removable for cleaning or defrosting. See page 23 “Routine maintenance”.

4. Outer door latch: Always lock the latch when the outer door is closed.

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 back-up system to chamber.

8. Air intake vent (grille): Do not block this vent to keep the proper cooling performance.

9. Caster: 4 casters are provided to facilitate moving of the cabinet. For the installation, adjust the

leveling foot so that the front 2 casters cannot contact with the floor.

10. Leveling foot: The height of the freezer can be adjusted by this screw type foot. Keep the unit in level at the installation.

11. Condenser filter (behind the grille): This filter prevents the dust from accumulating on the condenser. The dusty filter may cause failure of refrigerating device. Clean the filter once a month. See page 22 “Routine maintenance” for the cleaning.

12. Space for temperature recorder: An automatic temperature recorder (optional component) can be attached here. See page 31“ Temperature recorder (Option)”.

13. Key lock: Turn clockwise to 180

14. 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 12 “Installation”.

15. Power switch: This is for turning ON/OFF the power to the unit. ON – “I” OFF – “٤”

16. Remote alarm terminal: This is used to notice an alarm condition of the unit to remote location.

Refer to page 17 “Remote alarm terminal”.

with a key and the outer door is securely locked.

17. 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).

18. Space for optional component:

19. Door switch: This switch detects the open/close status of outer door.

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FREEZER COMPONENTS

(

)

Control panel

1 32 654

TEMPERATURE

ULTRA LOW

BUZZER

1. Digital temperature indicator: This indicator shows the present chamber temperature or set

temperature.

2. Status monitor lamp (STATUS): This lamp lights when environmental condition or status gets worse or the unit is out of normal operation.

3. Battery check lamp (BATTERY): This lamp lights to recommend the battery replacement. This lamp blinks when a fan motor is maintained. For the replacement, consult Sanyo sales representative or agent.

4. Door check lamp (DOOR): This lamp lights when the door is open.

ALARM

TEST

STATUS SET

11 10 9 8

BATTERY STATUS

FILTER

LARM

DOOR

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 22.

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 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 14,15,16,19 and 20 for details respectively.

8. 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 14 for details.

9. 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 for details.

10. Status key (STATUS): By pressing this key in the event of the status monitor lamp ON, the status code is displayed on the digital temperature indicator. This key is not effective when the freezer is running normally. See page 18 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. The buzzer during alarm test cannot be silenced by this key.

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INSTALLATION SITE

To operate this unit properly and to obtain maximum performance, install the unit in a location with the following conditions:

Ŷ 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.

Ŷ 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.

Ŷ 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.

Ŷ A location with little temperature change

Install the unit under stable ambient temperature. The allowable ambient temperature is between +5 and +30

Ŷ 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.

Ŷ 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.

Ŷ 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.

Ŷ 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.

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INSTALLATION

1. Removing the packaging materials and tapes

Remove all transportation packaging materials and tapes. Open the doors and ventilate the unit. If the outside panels are dirty, clean them with a diluted neutral dishwashing detergent. (Undiluted detergent can damage the plastic components. For the dilution, refer to the instruction of the detergent.) After the cleaning with the diluted detergent, always wipe it off with a wet cloth. Then wipe off the panels with a dry cloth.

2. Adjusting the leveling foot

Extend the leveling feet by rotating them counterclockwise to contact them to the floor. Ensure the unit is level. (Fig. 1)

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)

Leveling foot

4. Ground (earth) (Except for USA and CANADA)

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.

Fig.1

Fixture

Fig. 2

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.

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