Common faults and maintenance of ultra low temperature freezer
1 Reduce the refrigeration effect of refrigerators, human touch body metal parts have electric shock feeling
Method: the multimeter is used to measure the refrigerator leakage, the stepwise method inspection. In high temperature stage compressor to separate power operation, check whether it is due to leakage caused by the compressor and the whole body charged. Static detection of compressor terminal, observe the motor winding wire plug part, if the chassis and traces the strike, showed that the leakage.
2 After the power is switched on, the air switch power supply automatically disconnect
Troubleshooting: check the first stage compressor refrigeration system is damaged, if damaged, will cause a short circuit, causing the power protection. Can replace the parts, if there is no original factory parts, refrigerator compressor can be measured by the replacement of the equivalent power, the pipeline welding, inspection of the pipeline by pressurized air tightness after vacuum pumping and join the R-12 Freon 23.00z, then start to detect whether normal.
3 The temperature does not reach the set temperature has stopped working
Troubleshooting: Although the box did not reach the set temperature, but the panel display temperature has reached the set temperature. This is because the thermistor temperature detection of damage, in need of replacement parts. If there is no original factory parts, can be re installed a set of temperature control system, you can eliminate fault.
Ultra low temperature freezer maintenanceis particularly important for prolonging its life and normal use, if the temperature control is not accurate often leads to the save the object is damaged, a great impact on the experimental results, thus affecting the normal work.
1 Refrigerator inadequate cooling
Check whether there is Sherbet refrigerator evaporator surface; whether the door switch frequency; whether the refrigerator back contact wall; if people put too many items.
2 Monthly cleaning time, in order to ensure its cleanliness
A small amount of dust with a dry cloth cleaning refrigerator inside and outside parts of the refrigerator is too dirty, if you use a neutral detergent, cleaning after use clean water rinse thoroughly. But not in the refrigerator and the upper flushing, otherwise it will damage the insulation material and cause the fault. Compressors and other mechanical parts does not require the use of lubricating oil. Clean the compressor rear fan to be careful. Billong instrument network after cleaning for safety inspection, to ensure that the refrigerator plug, not virtual connection plug; ensure no abnormal heat; ensure that the power supply wire and distribution wire back without cracking and Nick refrigerator.
3 Refrigerator noise is too large
Check the floor is solid; the refrigerator is firm; such as instability, adjusted the activities to make four angle screw firmly supported on the floor; whether the object into contact with the refrigerator back.
If the cooling effect is poor, the refrigerator does not stop, radiator is not hot, the evaporator is very mean flow of sound, this is because the slow leakage caused by refrigerant serious defect. In the actual use of the process, will encounter many other problems, the solution to this problem need to continue to accumulate experience can remove obstacles, the ultra low temperature freezer to achieve the best working condition.
4 Alarm system
When the alarm start alarm, usually can be checked through the following aspects.
First, check the power supply is a problem or plug is pulled out of the socket;
Second, check whether the internal temperature exceeds the proper range, in this case, the people will make the refrigerator temperature articles, and trigger the alarm;
Third, check whether the disposable placing too many items.