Uses 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

Constant Humidity: (Adjustable range 20-95%)

Ambient Temperature: 0-23℃.

Structural Features

This instrument features a top-opening door, thickened insulation layer for good low-temperature retention, convenient experiments, a corrosion-resistant alloy plate for the constant temperature bath, high-quality steel plate exterior, and polyurethane insulation material in the middle.

Precautions

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

For the first use (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 interruption, 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 failure. 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 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 wires 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 easily losing moisture, 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 for a long time and slow temperature decrease, failing to meet requirements.

5. After work, cut off the power, remove frozen samples, open the freezer door to allow natural warming, let frost melt, drain 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, check that the panel switch is off.

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

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

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

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 any dirt and moisture.

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 is not working properly, only humming sound. If voltage is low, install a voltage stabilizer with more than 5 times input.

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

4. Compressor is normal but cooling is slow: (1) Door opened frequently or not closed tightly. (2) Too many items placed improperly. (3) Freezer is frosted.

5. Excessive noise: (1) Freezer is not placed stably. (2) Freezer fixtures are loose. (3) Freezer and compressor are in contact.

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°C to 80°C during operation.

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

4. During rainy and humid seasons, frost may form on the surface of the cabinet; 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 repair 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 (custom machines are non-returnable). During the warranty, logistics costs are paid by the shipping party (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°C.

Digital temperature controller instructions:

Quickly press the “set” button three times 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 set to lock it. The upper limit value (positive F) is displayed; 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 to lock the delay value, then display JCC cooling mode (must be JCC). Press set to lock the cooling 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 is displayed. (After setting, press set once more and wait 16 seconds before turning off, otherwise settings will not be saved).

Setting example: (1) -25 degrees — lower limit negative F25, upper limit positive F22, delay Y03, cooling 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, cooling, Y03, JCC, C-6.

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

Special note on temperature calibration C-6:

If there is a discrepancy between the internal temperature and the instrument display, quickly press the SET key 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. Example: if the instrument shows -24 degrees but the internal temperature is -25 degrees, change C-6 to C-1.