Meling Biomedical Combined Refrigerator and Freezer Operation Manual

Applicable Models

The following product models are applicable:

• YCD-FL289
• YCD-EL300
• YCD-EL450
• YCD-FL450
• YCD-FL519

1. Application Notes

Thank you for choosing Meling Biomedical products. Please read this Operation Manual carefully for safe and convenient use and reasonable maintenance. Keep it properly for reference. Operators may copy some chapters for internal use, such as instructing users on handling emergencies. Meling Biomedical is not responsible for any instrument damage caused by failure to use the equipment according to instructions or specified methods. Due to product improvements, functions described may differ from purchased products; refer to physical functions. Please read Safety Instructions (Section 2) carefully. Avoid violent vibration, collision, and rain during transportation or use. The equipment should only be operated by trained and authorized personnel. For situations not covered, contact Meling Biomedical or an authorized agent. Using non-Melin Biomedical accessories may lead to damage, for which Meling Biomedical is not responsible. Maintenance must be performed by Meling Biomedical or an authorized agent. Regular inspection and maintenance are crucial for good operation. Always wear protective gloves. Do not use mechanical devices to accelerate defrosting other than those recommended. After each access, dry water stains around the sealing strip to prevent freezing. Wear protective gloves when storing items to avoid frostbite.

Tips:

• Always use protective equipment correctly.
• Maintain good hygiene habits.
• Each person is responsible for their own safety.
• Keep ventilation openings clear of obstructions.
• Do not damage the refrigerating circuit.
• Do not use electrical appliances inside the storage compartments unless recommended by the manufacturer.
• This appliance is not intended for use by persons with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless supervised.
• Supervise children to ensure they do not play with the appliance.
• If the supply cord is damaged, it must be replaced by the manufacturer, service agent, or similarly qualified persons.

2. Safety Instructions

Pay attention to warning signs and safety precautions for safe and correct use.

• Warning! Failure to observe precautions may result in serious personal injury or death.
• Attention! Failure to observe precautions may result in personal injury or equipment failure and property loss.
• Must be grounded.
• Do not place it obliquely.
• Risk of Explosion: Indicates risk when using volatile/explosive chemicals.
• Beware of electric shock.
• Avoid direct sunlight.
• Beware of low temperature.
• Beware of fire: Warning; flammable material.
• Warning: Crushing of hands.
• Warning: Risk of fire/flammable materials.
• Do not touch the equipment with wet hands to avoid electric shock. Do not ground through gas pipeline, water supply pipeline, telephone line, or lightning rod.
• Installation should be done by professional technicians or after-sales maintenance personnel to avoid electric shock or fire.
• Install on solid, flat ground to prevent tipping.
• Handle the power cord carefully to avoid short circuits or open circuits. Turn off power before unplugging. Do not pull wires.
• Do not bundle the power cord, press it under furniture or heavy objects, or place it near heat sources.
• Insert the power plug tightly into the outlet. Ensure the power plug is accessible for emergencies.
• Use separate, reliably grounded outlets with a copper conductor cross-sectional area of at least 4mm². Do not lengthen the power cord.
• Do not use power supplies not specified in the design to avoid overheating or short circuits. Use a voltage stabilizer if operating voltage is unstable.
• Place the equipment stably and avoid shaking.
• Do not place the equipment in dangerous areas or near flammable items.
• Vents and drains are at the bottom; do not place items there.
• Do not place the equipment in areas exposed to sun or rain to prevent short circuits or overheating.
• Do not tilt or lay the equipment sideways; avoid impact.
• Place in a dry, dust-free environment to avoid overheating and short circuits.
• In case of unexpected sound, smell, or smoke, unplug the power and contact the manufacturer/supplier.
• Ensure equipment vents and surfaces are not blocked. Do not use in poorly ventilated environments.
• Do not disassemble or modify the equipment without authorization.
• Do not place inflammable, explosive, corrosive, or unsuitable items in the equipment.
• When storing toxic, harmful, or radioactive materials, use in safe areas.
• Do not insert metal objects into any aperture or gap to avoid electric shock or injury.
• Maintain at least 30cm clearance from walls for ventilation and heat dissipation.
• This equipment must be connected to a ground wire.
• Note: Failure to observe precautions may result in personal injury or equipment failure and property loss.
• Do not store living animals, flowers, or items with strict temperature requirements.
• Do not touch the inner surface of the cabinet while it is running without protective gear.
• Hold the handle and close the door carefully to avoid pinching fingers. Unplug and pack for long-term storage.
• When restarting after power failure, check settings first to avoid damaging stored items.
• The equipment is for item preservation, not production.
• Keep keys properly to prevent accidental opening by children.
• Handle the equipment carefully to avoid tipping.
• Lift from the bottom, with an incline not greater than 45°, and handle with care.

3. Precautions in Use

• Before storing items, confirm the storage chamber temperature has reached the set value. Do not exceed 1/3 of the inner volume per batch to prevent excessive temperature rise.
• The cabinet has a test hole for test lines. Plug it with thermal insulation material after testing to maintain temperature and prevent condensation.
• The displayed temperature is from the sensor. Actual temperature at the center may differ initially but will stabilize.
• Clean with a diluted neutral cleaner. Avoid brushes, acid, gasoline, soap powder, polishing agents, or hot water. Be careful with volatile solvents like gasoline.
• Frost may form on the inner wall and door. Remove items before defrosting and store them appropriately.
• Cut off power supply when the equipment is not used for a long time.

4. Product Installation

4.1 Installation Environment

• Ambient temperature: 16°C – 32°C (ideal: 18°C – 25°C). Use air conditioning if necessary.
• Relative humidity: ≤80%RH.
• No strong vibration or corrosive gas.
• Avoid excessive dust.
• Avoid rocking or shaking.
• Elevation: Less than 2000m.
• Indoor use, pollution degree 2, overvoltage category II.
• Refer to specifications for input voltage (Rated voltage ±10%).
• Avoid direct sunlight, heat sources, and strong electromagnetic interference.

4.2 Installation Site

• Ensure adequate space for normal operation and access. Room door should not be smaller or lower than the equipment.
• Installation floor must be solid, flat, non-combustible, and capable of bearing the equipment's weight.
• Ensure good ventilation and avoid direct sunlight.
• Check working voltage. Use a voltage stabilizer for unstable voltage areas. Contact after-sales personnel if unsure.
• Elevation: Less than 2000m.
• Ensure reliable grounding. Check outlet grounding or install by professionals if absent.

4.3 Preparation Before Use

• Remove outer packaging and protective foam.
• Warning: Keep plastic bags away from children to prevent suffocation.
• Inventory accessories against the packing list.
• Clean the product before use.

4.4 First Power-on

1. After placement, leveling, and cleaning, let the equipment stand for over 24 hours before powering on.
2. Connect the power cord to a suitable outlet under no-load condition.
3. Turn on the equipment's power switch.
4. Check if the operating temperature reaches the required value. Observe normal start/stop for over 24 hours. Load a small amount of items after confirming normal performance.
5. Load items in batches, not exceeding 1/3 of the cabinet volume each time. Ensure the equipment runs properly after shutdown for over 12 hours before loading the next batch.
6. Avoid opening the door during cooling to prevent temperature rise.

4.5 Operation after Power Failure

1. The equipment has a memory function for set values and will resume operation after power restoration.
2. Wait 5 minutes after powering off before switching on again to avoid compressor damage.
3. Meling Biomedical guarantees normal operation under certain conditions but is not responsible for losses due to power failure.

Notes:

• Equipment movement is via casters.
• A designated person should check and record the equipment's running status every 2-4 hours. In case of failure, remove items to a suitable storage location if immediate repair is not possible.
• Confirm the temperature range meets item requirements before storing to avoid damage. Do not block air outlets/inlets.
• A slight difference between displayed and actual temperature is normal due to refrigeration inertia.
• The equipment is for item storage, not routine production. Avoid loading too many hot items at once to prevent compressor overheating. Load items in batches.
• Do not use electrical appliances without a production license inside.
• Avoid frequent set temperature changes due to temperature inertia. Ensure air circulation and do not block the temperature sensor.
• Place items on shelves, not directly on the bottom.
• Item moisture content affects cabinet humidity. Keep items sealed. Working environment humidity also affects cabinet humidity, especially with frequent door openings.
• Warning: Children are not allowed to play with this equipment; injury or loss is at their own risk.

5. Component Composition

The product consists of a cabinet body, door body, refrigeration system, and control system.

Diagrams showing components of YCD-EL300, YCD-FL289, and YCD-EL450 models are provided.

Capacity details:

• YCD-FL289 freezer: six shelves, 21 Kg capacity each.
• YCD-EL300 freezer: six shelves, 23 Kg capacity each.
• YCD-EL450/YCD-FL450 freezer: six shelves, 29 Kg capacity each.
• YCD-FL519 freezer: six shelves, 34 Kg capacity each.

Note: Actual products may differ from diagrams due to model variations. Diagrams are for functional description only.

Scope of application: Hospitals, epidemic prevention stations, and scientific research institutes for refrigeration or freezing.

6. Operating Instructions

6.1 Function Introduction

The series includes two types of control systems (Type A and Type B). Refer to the control system type of your purchased unit.

Type A control panel (applicable to YCD-EL300):

• a: Refrigerator chamber temperature display (°C).
• b: Freezer chamber temperature display (°C).
• c: Decrease parameter value / move to previous parameter.
• d: Increase parameter value / move to next parameter.
• e: Refrigerator setting button.
• f: Refrigerator refrigeration indicator (lights up when working, goes out when stopped, flashes when delayed).
• g: Refrigerator defrosting indicator (lights up when working, goes out when stopped).
• h: Freezer refrigeration indicator (lights up when working, goes out when stopped, flashes when delayed).
• i: Freezer defrosting indicator (lights up when working, goes out when stopped).
• j: Freezer setting button.

Function setting of Type A control panel:

1. After powering on, the equipment enters the working state.
2. User parameter settings: Press SET key. Adjust temperature using ↑ or ↓ keys. Long press ↑ or ↓ for rapid adjustment. Press SET or wait 5s to save and return.
3. On and Off: Press key for 3s to turn off display and output control (refrigerator or freezer chamber can be turned off separately). Press any key to turn on.
4. Parameter display: Shows alarm codes and descriptions (E1: Refrigerator sensor failure, E2: Freezer sensor failure, dA: Door ajar alarm).

Note: In case of high/low temperature alarm, buzzer sounds and digital tube flashes. In data/sensor failure, buzzer sounds and mutes on key press. Mute fails after 30 mins or when failures are resolved.

Type B control panel (applicable to YCD-FL289/YCD-EL300/YCD-EL450/YCD-FL450/YCD-FL519):

• a: Temperature display for upper refrigerator and lower freezer chambers (°C).
• b: Door opening indicator (lights up when door opens, alarm/buzzer after 1 min).
• c: Fault indicator light (off when normal, on for abnormality).
• d: LIGHT key (controls interior light; automatic or manual).
• e: PRINT key (prints 7 days of data).
• f: Decrease parameter value.
• g: Increase parameter value.
• h: Set/Mute key (displays ambient temp for 5s, enters user menu with long press).

Function description of Type B control panel:

• Door opening indicator: Lights up when the refrigerator chamber door is opened. After 1 minute, the door opening alarm indicator light turns on, and the buzzer sounds, displaying "door".
• LIGHT: Controls interior lighting. Can be automatic (lights on when door opens, off after 5s delay) or manual (always on until key pressed again).
• PRINT: System stores 7 days of data for printing.
• Parameter setting mode: Use ↑/↓ keys to adjust values. Long press ↑/↓ for rapid adjustment.
• USB interface: Automatic export when U disk is connected. Manual export by pressing ↑ key for 3 seconds.
• Note: Prompts like "USB", "on", "End" may not display with less data.
• Note: If "LoF" appears, the recorder is not started. Press and keys for 3s to start.

Function setting of Type B control panel:

1. After powering on, the machine enters the working state.
2. User parameter settings: Unlock by pressing ↑ and key simultaneously for 3s. Enter password "0005" (or "0099" to restore default). Press key for 3s to enter setting mode.
• Use ↑ to scroll parameters.
• Use ↑ or ↓ to increase/decrease values.
• Use 4 to temporarily store values.
• Repeat steps for other parameters.
• Press key for >3s to save and return.
3. Press key for >3s or no key for 60s to exit.

Parameter Table:

Quick setting menu:

The quick setting menu exits automatically after 60 seconds of inactivity.

4. Alarm display

6.2 Optional function

1. Printer

The printer is factory-installed. Use thermal paper rolls (width: 57.5±0.5mm, outer diameter ≤40mm). Printer panel description: ① Open button, ② SEL button (for factory setting), ③ Lf button (power indicator), ④ Paper roll. To install the paper roll, open the cover, insert the roll, and allow the paper head to extend slightly.

2. Remote alarm terminal, RS485 interface and network interface

These interfaces are located on the lower part of the back of the freezer body. Configurations may vary by model.

Diagrams show: Remote alarm terminal (N.O., COM., N.C.) and RS-485 connector.

7. Defrost, Discontinuation and Maintenance

Warning: Cut off power supply before any repairs or maintenance. Avoid inhaling harmful substances.

7.1 Equipment Maintenance

• Defrosting: The equipment automatically defrosts during operation.
• Cleaning and maintenance: Unplug the power cord. Wipe inner and outer surfaces with a warm, damp soft cloth.
• Note: Do not spray water directly on the cabinet. Do not use hot water, corrosive detergents, or organic solvents. Do not place heavy objects on top. The air switch provides circuit protection.

7.2 Equipment Discontinuation

• Deactivation: If storing for a long time, cut off power, clean, air, and seal the interior. Lock the door to prevent children from opening it.
• Scrapping: At end of service life, scrap through a qualified recycling agency. Do not disassemble without authorization. Place scrapped equipment in a designated area inaccessible to children.

8. Troubleshooting and Maintenance Services

Observe operation and check the table for abnormalities. Contact the service center if issues persist. Fan motor replacement: approx. 6 years. Product service life: 10 years.

The following conditions are not faults:

• Slight impact sound when the compressor starts/stops.
• High temperature/humidity alarms when hot items are loaded (refer to alarm display table). Cool items naturally before loading.
• Slight sound of water from refrigerant flow.

Notes:

• Only MELING BIOMEDICAL certified engineers can repair, maintain, or improve the equipment.
• Clean and disinfect before maintenance. Warranty is void for user-caused faults.
• Ambient temperature for storage: -40°C ~ +55°C, relative humidity: 10% ~ 90%.

9. Specifications

Detailed specifications for various Meling Biomedical Combined Refrigerator and Freezer models are provided in tables, including Model, Ambient Temperature, Climate Type, Refrigerant, Voltage, Frequency, Temperature Range, Volume, Current, Weight, and Exterior Dimensions.

Key specifications include:

• YCD-EL Series: Refrigerant R600a, Temperature Range: Refrigerator 2~8°C, Freezer -10~-26°C.
• YCD-FL Series: Refrigerant R134a/R290, Temperature Range: Refrigerator 2~8°C, Freezer -10~-40°C.
• Capacities range from 289L to 519L.
• Foaming agent: Cyclopentane.

10. Accessories

Standard accessories include Operation Manual, Qualified Certificate, Key, and Defrosting shovel. Models YCD-FL289 and YCD-FL519 do not include keys. Specific accessories are subject to physical objects received.