Purpose 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 branded compressors, condensers, filters, capillaries, evaporators, constant temperature tanks, digital display instruments, and digital temperature control systems. The machine cools quickly, operates quietly, and is reliable and convenient to use.

Technical Parameter Box

Instrument Volume:

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 Brazilian Embraco imported compressor)

Power Supply: AC220V, 50Hz

Constant Humidity: (Adjustable range 20-95%)

Ambient Temperature: 0-23℃.

Structural Features

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

Precautions

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

For the first use (or after long periods of non-use), 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 pools, heat sources, magnetic fields, and volatile or corrosive substances.

6. Must use an independent socket. The current capacity of the socket and wires should be no less than 10A, and the socket must be reliably grounded.

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

Freezing Instructions

1. When placing samples, leave gaps between samples and between samples and the inner tank to ensure air circulation and uniform cooling.

2. For samples with high humidity or prone to moisture loss, wrap them well with sealed food bags or cling film to prevent moisture escape and frost formation 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 samples at one time, as this causes the compressor to run continuously and slows temperature drop, failing to meet requirements.

5. After work, cut off power, remove frozen samples, open the freezer door to allow natural warming and defrosting. Drain water and wipe dry with a soft cloth.

Usage Instructions

1. Carefully read the user manual before using the quick-freezing box.

2. Pre-start check: A) The quick-freezing box 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 in the off position.

3. Power On: Plug in the power supply and turn the power switch on the panel to the ON position. At this time, the display panel shows the cabinet temperature. After the computer temperature controller's preset delay start time, the compressor begins to operate.

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

5. Power Off: After use, when you need to shut down, you must first turn the power switch on the panel to the OFF position (display turns off), then disconnect 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 any dirt and moisture.

2. Do not use boiling water, acidic agents, chemical solvents, 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 exterior, you can use water or a small amount of neutral detergent. Be careful not to let the power cord or lower wiring get wet to avoid moisture and electric leakage.

Common Faults and Troubleshooting Methods

1. Indicator does not light up; no 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 makes a buzzing sound. Voltage is low; install a voltage stabilizer with at least 5 times input.

3. Compressor starts but stops within 1 minute, then after a few minutes restarts repeatedly. Refer to troubleshooting step 2.

4. Compressor works normally but cooling is slow: ① Door opened frequently or door not closed tightly. ② Too many items placed inside or improperly arranged. ③ Freezer is frosted.

5. Excessive noise: ① Freezer is not placed on a stable surface. ② Freezer components are loose. ③ Freezer is in contact with the compressor.

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

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

2. When the compressor is working, the surface temperature may reach 70℃ to 80℃.

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 cabinet surface; wipe it off with a dry cloth.

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

Repair Instructions

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

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 the date of 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, and technical support is provided. If the compressor is replaced, the factory charges a service fee of 150 yuan, and refrigerant is provided free by the factory. 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 crate packaging for repair 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 key 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. The JCC cooling mode is displayed (must be JCC). Press set to lock the cooling mode. The C-6 temperature calibration range is displayed (factory preset). Press set to lock. After waiting 16 seconds, all settings are saved and the actual internal temperature is displayed. (After setting, you must press the set key 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 about temperature calibration C-6:

 If there is a discrepancy between the temperature inside the box and the temperature displayed on the instrument, quickly press the SET button three times: (1) "F" appears upside down, (2) press SET again to display "F" upright, (3) press SET again to display "Y03", (4) press SET again to display "JCC", (5) press SET again and the "Set" key will display "C-6" to set the internal sensor calibration of the box (calibration range -6 to +6). After setting, press the "SET" key once more to confirm the set value. For example: if the instrument shows a temperature of -24 degrees and the internal box temperature is -25 degrees, then change C-6 to C-1.