Industrial Cryogenic Refrigerator Faults and Troubleshooting Methods

2022/08/30 ClassificationIndustry News NEWS 208

Industrial Cryogenic Refrigerator Faults and Troubleshooting Methods

The refrigeration system and control circuit of the ultra-low temperature refrigerator are relatively complex, but the common faults are mainly the circulation system and circuit part faults. The following briefly introduces several common faults and their troubleshooting methods.

1. After the power is turned on, the switch of the main power supply is automatically turned off

Remedy: Check whether the compressor of the refrigeration system is damaged. If it is damaged, it will cause a short circuit and cause power protection. Parts can be replaced. If there are no original parts, you can replace the refrigerator compressor with a comparable power after calculation, and weld the pipeline. After checking the air tightness of the pipeline after pressurization, vacuum and add R-12 Freon 23.00z, and then start the machine again. detection.

2. If the temperature in the box does not reach the set temperature, it will stop working

Remedy: Although the box has not reached the set temperature, the panel display temperature has reached the set temperature. This is because the thermistor that detects the temperature is damaged and needs to be replaced. If there are no original parts, you can re-install a temperature control system to eliminate the fault.

3. The cooling effect of the refrigerator is reduced, and people feel electric shock when they touch the metal part of the box

Elimination method: use a multimeter to measure the leakage of the refrigerator, and use the segmentation method to check. When energizing the high-temperature stage compressor alone, check whether the whole box is electrified due to the leakage of the compressor. Statically check the compressor terminal, and pay attention to observe the lead plug part of the motor winding. If there is a trace of ignition with the casing, it indicates that there is leakage.

The method of replacing the terminal part and the surrounding part of the casing is adopted. After installing the body, turn it on to make it run, and check whether there is any leakage. After the indicators of the compressor are normal, put it back on the base of the low-temperature refrigerator. Connect the pipes, check for leaks, evacuate, and fill with an appropriate amount of refrigerant to restore the refrigerator to normal operation.

The maintenance and maintenance of ultra-low temperature refrigerators is particularly important to prolong its life and normal use. If the temperature control is not accurate, the preserved objects are often damaged, which will have a great impact on the experimental results, thus affecting the normal progress of research work.

1. Clean it once a month to ensure its cleanliness

Use a dry cloth to remove a small amount of dust from the inside and outside of the refrigerator and accessories. If the refrigerator is too dirty, use a neutral detergent. After cleaning, rinse thoroughly with pure water. But do not flush the inside and upper part of the refrigerator, otherwise it will damage the insulation material and cause malfunction. Compressor and other mechanical parts do not require the use of lubricating oil. Be careful when cleaning the fan at the rear of the compressor. Do a safety check after cleaning to make sure the refrigerator is plugged in. Make sure the plug is not unusually hot, and that the power and distribution wires on the back of the refrigerator are not cracked or nicked.

2. The siren activates the alarm

When encountering a siren activation alarm, it can usually be checked through the following aspects.

First, check to see if there is a problem with the power supply or if the plug is pulled out of the outlet.

Second, check that the internal thermometer is not out of the proper range.

Third, check whether there are too many items in the box.

3. Insufficient cooling of the refrigerator

Check whether there is frost on the surface of the evaporator; whether the refrigerator door is opened and closed too frequently; whether the back of the refrigerator touches the wall; whether there are too many items.

4. The refrigerator is too noisy

Check whether the bottom plate is firm; whether the refrigerator is stable; if it is unstable, adjust the movable screws so that the four corners are firmly supported on the bottom plate; whether there is any object touching the back of the refrigerator.

If the refrigeration effect of the industrial refrigerator is poor, the refrigerator does not stop, the heat dissipation pipe is not hot, and the evaporator has a small airflow sound, these are due to the serious defect of the refrigerant caused by slow leakage. In the actual use process, there will be many other problems. The solution to such problems requires continuous accumulation of experience to remove obstacles and make the ultra-low temperature refrigerator reach a perfect working state.

We are a professional manufacturer of temperature control equipment, supporting customized services, please consult us for details!