Applications and Features

This equipment is suitable for low-temperature quick-freezing tests of various products, such as chemicals, physics, pharmaceuticals, instruments, meters, electrical appliances, marine biology, etc. It is used for low-temperature storage of vaccines and serums, microbiological research and cultivation, drug testing and storage, low-temperature testing of building materials, etc. The instrument consists of a branded compressor, condenser, filter, capillary tube, evaporator constant temperature bath, digital display instrument, and digital temperature control system. The machine cools quickly, operates quietly, and is reliable and easy to use.

Technical Parameter Box

Instrument Capacity:

Vertical: 30L, 40L, 60L, 80L, 200L
Horizontal: 30L, 115L, 160L, 190L, 230L

Lowest Temperature: -25℃, -40℃, -50℃, -60℃, -80℃, -100℃

Temperature Control Accuracy (Uniformity): ±2℃ (also available with high precision ±0.5℃)

Compressor: Domestic compressor (also available with imported Embraco compressor from Brazil)

Power Supply: AC220V, 50Hz

Ambient Temperature: 0-23℃.

Relative Humidity: Not more than 75%

Structural Features

This instrument uses a top-opening door with thickened insulation layers for good low-temperature retention and convenient experiments. The constant temperature bath is made of highly corrosion-resistant alloy plates, with high-quality steel plates on the outside and polyurethane insulation material in the middle.

Precautions

1. The instrument must not be stored or used in environments with moisture or corrosive gases.

When using for the first time (or after long periods of inactivity), the machine must operate for 2 hours before testing to avoid inaccurate initial readings.

2. In case of power outage or disconnection for any reason, immediately turn off the power switch. If restarting is needed, wait at least 30 minutes before turning on the machine again to avoid compressor damage from rapid startup.

3. This instrument is suitable for laboratory testing.

4. It is strictly forbidden to run the machine for long periods when not in use.

5. During transportation, the tilt angle must not exceed 45° to avoid compressor or system damage. When in use, remove all packaging. Leave more than 50cm space behind the freezer and more than 15cm on both sides. The freezer should be placed in a ventilated and dry place, avoid direct sunlight, and keep away from water pools, heat sources, magnetic fields, and various volatile or corrosive substances.

6. A dedicated socket must be used. The current capacity of the socket and wiring should be no less than 10A, and the socket must be reliably grounded.

7. The power supply is single-phase AC 50Hz, voltage 220-242V. If voltage is unstable, install a voltage stabilizer with at least 5 times the input power. Use a stabilizer to regulate: 220V 50Hz 15A. The instrument must be grounded.

Freezing Instructions

1. When placing samples, leave some space between samples and between samples and the inner wall of the freezer to ensure air circulation and uniform cooling.

2. For samples with high humidity or prone to moisture loss, wrap them tightly in sealed food bags or cling film to prevent moisture from escaping and causing frost inside the chamber, which affects cooling.

3. It is strictly forbidden to store volatile or flammable gases and liquids in the freezer, such as strong alkalis, strong acids, gasoline, alcohol, etc.

4. Do not overload the freezer with samples at one time, as this will cause the compressor to run continuously and the internal temperature to drop slowly, failing to meet requirements.

5. After finishing work, cut off the power, remove frozen samples, open the freezer door to allow natural warming, let the frost melt, drain the water, and wipe dry with a soft cloth.

Usage Instructions

1. Carefully read the user manual before using the quick freezer.

2. Pre-start check: A) The quick freezer must have an independent power socket and reliable grounding. Voltage fluctuation range allowed is 220-240V, frequency 49-51Hz. B) Before connecting external power, ensure the panel switch is in the off position.

3. Start-up: Plug in the power, turn the panel power switch to ON. The display will show the chamber temperature. After the delay time set by the computer temperature controller, the compressor will start running.

4. Operation: Once the temperature reaches the required level, quickly and evenly place the stored items inside the chamber.

5. Shutdown: After use, to shut down, first turn the panel power switch to OFF (display off), then cut off the external power supply.

Maintenance and Care

1. The freezer should be cleaned after each test during use. When cleaning, cut off the power, remove items, and wipe off moisture and dirt.

2. Do not use boiling water, acidic agents, chemical diluents, etc.

3. After cleaning, wipe it dry.

4. When cleaning the door seal, please use mild soapy water and wipe carefully.

5. When cleaning the outer shell, water or a small amount of neutral detergent can be used. Be careful not to immerse the power cord or lower wiring in water to avoid moisture and electric leakage.

Common faults and troubleshooting methods

1. Indicator does not light up; no instrument display after turning on the switch. Check the power supply and plug.

2. Indicator light is on, but the compressor does not work properly and only hums. If voltage is low, install a voltage stabilizer with more than 5 times input.

3. The compressor starts but stops within 1 minute, then restarts after a few minutes repeatedly. Repair according to item 2.

4. Compressor works normally but cooling is slow: ① Frequent door openings or door not closed tightly. ② Too many items placed inside or improper placement. ③ Frost buildup in the freezer.

5. Excessive noise: ① Freezer is not placed on a stable surface. ② Loose fasteners on the freezer. ③ Contact between the refrigeration box and compressor.

The following phenomena are not faults, please do not worry.

1. When the freezer is working or shortly after stopping, the refrigerant circulates inside the pipes, producing a gurgling water sound.

2. The compressor surface temperature may reach 70℃~80℃ during operation.

3. When the compressor starts or stops, the switch components may produce slight clicking sounds.

4. During rainy and humid seasons, frost may form on the surface of the box; wipe it off with a dry cloth.

5. The inner side of the freezer lining is a stress relief area under ultra-low temperatures. Slight cracks may appear under alternating high and low temperatures, which is normal and does not affect use.

Maintenance Instructions

1. If abnormal phenomena or faults occur during use, please have a professional technician repair it (or under manufacturer guidance).

2. Our factory provides free spare parts for domestic compressors (custom machines) within one year from the date of shipment, and free one-year warranty for imported compressors (standard machines).

3. Warranty period: one year from delivery and acceptance, excluding fragile glass parts (no returns or exchanges for custom machines). During the warranty, logistics costs are paid by the sender (who ships pays), spare parts are provided free by the factory, with technical support. If the compressor is replaced, the factory charges a service fee of 150 yuan, and refrigerant is provided free. For glass-covered low-temperature boxes, a quilt should be placed on the cover for insulation.

Note: 1.   After unpacking, remove the base and keep ventilation.

2. Please keep the wooden packaging for maintenance use; otherwise, the user bears the cost.

3. It is strictly forbidden to operate continuously in environments above 35℃.

Digital temperature controller instructions:

Quickly press the “set” button three times consecutively to enter the setting mode: first, the lower limit setting value is displayed (negative F). Use the up or down keys to select the lower limit value, then press the set button to lock it. The upper limit value (positive F) is displayed next; use the up or down keys to select the upper limit value, then press set to lock it. The delay status Y is displayed—Y03 means a 3-minute delay before starting (must be set to Y03 to avoid compressor damage). Press set again to lock the delay value, then display JCC refrigeration mode (must be JCC). Press set to lock the refrigeration mode, then display C-6, the temperature calibration range (factory adjusted). Press set to lock. After waiting 16 seconds, all settings are saved and the actual internal temperature of the instrument is displayed. (After setting, press the set button once more and wait 16 seconds before turning off, otherwise the settings will not be saved).

Setting example: (1) -25 degrees — lower limit negative F25, upper limit positive F22, delay Y03, refrigeration JCC, calibration C-6.   (Special note: The horizontal line between negative F and positive F flashes to indicate below zero; otherwise, it changes to positive L and negative L for above zero.) (2) -40 degrees — lower limit -40, upper limit -37, refrigeration, Y03, JCC, C-6.

(3) -50 degrees — lower limit -50, upper limit -47, delay Y03, ... Wiring instructions: 1 neutral line, 2 live line. Refrigeration 1,3 output. 2,4 in series.

Special note on temperature calibration C-6:

If there is a discrepancy between the internal box temperature and the instrument display temperature, quickly press the SET button three times: (1) negative F appears, (2) press SET again to show positive F, (3) press SET again to show Y03, (4) press SET again to show JCC, (5) press SET again to show C-6 for internal sensor calibration (calibration range -6 to +6). After setting, press SET once more to confirm the value. Example: if the instrument shows -24 degrees but the box temperature is -25 degrees, change C-6 to C-1.