What to do if there is a problem in the high and low temperature test chamber, first we must determine the problem in the test chamber, and then deal with the problem.
The test box can be over-cooled, indicating that the external factors of cooling water can be eliminated
Since the temperature cannot be maintained, observe whether the refrigeration compressor can be started during the operation of the high and low temperature test box, and the compressor can be started during the operation of the high and low temperature test box, indicating that the electrical circuit from the main power supply to each compressor is normal. There is no problem with the electrical system.
There is no problem with the electrical system, continue to check the refrigeration system. First check the discharge and suction pressures of the low-temperature (R23) compressors of the two groups of refrigeration units are lower than normal, and the suction pressure is evacuated, indicating that the main refrigeration unit has insufficient refrigerant quantity. Touch the exhaust and suction lines of the main unit R23 compressor by hand and find that the temperature of the exhaust line is not high and the temperature of the suction line is not low (no frost), which also shows that the main unit R23 Lack of refrigerant, the system leaks fluorine.
The leak detection of the refrigeration system was checked by a combination of a leak detector and soapy water, and it was found that the stem of a hot gas bypass solenoid valve was cracked by a slit of about 1 cm. Replace the solenoid valve, recharge the system with fluorine, and the system is operating normally. As can be seen from the above, the analysis and judgment of this fault phenomenon are basically easy to difficult. First, "outside then" inside, first "electrical and then" cooling vein analysis and judgment, familiar with and understand The principle and working process are the basis for analyzing the fault and judging the fault.
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