The common trouble of the ultra-low temperature refrigerator and its elimination and maintenance

Ultra-low temperature refrigerator Although refrigeration system and control circuit are more complex, but the common fault is mainly the circulatory system and circuit part of the fault, the following is a brief introduction of several common faults and their elimination methods.

1. after power on, the air switch of the total power supply is automatically disconnected .

Elimination Method: Check the first stage refrigeration system compressor is damaged, if the damage will cause a short circuit, causing power protection. Can replace the spare parts, if there is no original parts, can be calculated to replace the equivalent power of the refrigerator compressor, the pipeline welding good, after the pressure to check the pipeline air tightness after vacuum and add R-12 freon 23.00z, Re-boot detection is normal.

This fault is generally caused by the power supply instability, because the first stage first start, so the damage is usually in the first level, in this case, generally as long as the addition of delay-stabilized power supply, there will be no longer the fault.

2. The temperature in the box has not reached the set temperature has stopped working

Exclusion method: Although the set temperature is not reached in the box, the panel display temperature has reached the set temperature. This is due to the temperature of the thermistor damaged, need to replace the accessories. If you do not have the original parts, you can reinstall a temperature control system to eliminate the failure.

3. refrigerator Cooling effect is reduced, people touch the metal part of the box has electric shock feeling

Elimination method: Using a multimeter to measure the refrigerator leakage, the use of sectional method to check. When the high-temperature compressor to operate independently, check whether the compressor leakage caused by the entire box charged. Static detection of the compressor wiring column, pay attention to observe the motor windings inside the lead plug part, if there is a spark mark with the chassis, indicating the leakage of the site.

The use of the terminal part together with the surrounding part of the shell to replace the method, installed on the body after the power to make its operation, check if there is no leakage phenomenon, such as the normal compressor indicators, installed back to the low-temperature refrigerator base, connecting pipelines, leak detection, evacuation, filling the appropriate amount of refrigerant to make the refrigerator back to normal operation.

The maintenance and maintenance of ultra-low temperature refrigerators is particularly important for prolonging the life and normal use of the refrigerator, which can affect the experimental results if the accuracy of the control is often caused by the damage of the stored objects.

1. Clean once a month to ensure cleanliness

Remove a small amount of dust from the inside and outside of the refrigerator with a dry cloth and use a neutral detergent if the refrigerator is too dirty and rinse thoroughly with purified water. But do not flush the inside and above the refrigerator, otherwise it will damage the insulating material and cause malfunction. Compressors and other mechanical parts do not require the use of lubricating oil. Always be careful when cleaning the rear fan of the compressor. After cleaning, make sure the refrigerator plug is plugged in, do not connect, make sure the plug has no abnormal heat, and make sure that the power cord and distribution wire on the back of the refrigerator are not cracked or scratched.

2. alarm to activate alarms

When an alarm is encountered, the following aspects can usually be checked.

First, check the power supply if there is a problem or whether the plug is pulled out of the socket;

Second, check whether the internal thermometer is outside the proper range, in which case the item will heat up the refrigerator and trigger the alarm;

Third, check whether there are too many items at once.

3. The refrigerator is not sufficiently cooled

Check the evaporator surface for frost, whether the refrigerator door is switched over frequency, whether the back of the refrigerator touches the wall, or if there are too many items.

4. Too much noise in the refrigerator

Check whether the base plate is strong, the refrigerator is stable, if unstable, adjust the movable screw so that the four corners are firmly supported on the bottom plate;

If the refrigeration effect is poor, the refrigerator does not stop, the heat pipe is not hot, the evaporator has a very small airflow sound, these are due to slow leakage caused by serious refrigerant defects. In the actual use of the process, there will be many other problems, the solution of such problems need to constantly accumulate experience to remove obstacles, so that the ultra-low-temperature refrigerator to achieve the best working condition.

This article is transferred from Guangzhou Biotechnology Co., Ltd. official website technical article http://www.zhyico.com/news_jsview.asp?id=1782

The common trouble of the ultra-low temperature refrigerator and its elimination and maintenance