How to solve the temperature drop in the constant temperature and humidity test chamber

Under normal circumstances, the constant temperature and humidity test chamber will reduce the temperature to the corresponding value according to the set time range. However, due to the long use time of the equipment or improper operation, it will cause the temperature of the constant temperature and humidity test chamber to slow down slowly. Now how Solve this problem and conduct technical discussions.

1. When we did not determine what was the problem with the constant temperature and humidity test chamber, we combined the equipment to further confirm the cause of the problem during the control process. The equipment has two sets of refrigeration units.

2. One main unit and the other auxiliary unit. When the cooling rate is large, the two sets of units work at the same time. In the initial stage of temperature maintenance, the two units still work at the same time. When the temperature is initially stabilized, the auxiliary unit stops working, and the host group maintains the temperature stability.

3. Since the temperature is not maintained, observe whether the refrigeration compressor can be started normally during the operation of the test box, and the compressor can be started during the operation of the environmental test equipment, 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 of the constant temperature and humidity test chamber. Continue to check the refrigeration system. Firstly, the exhaust and suction pressures of the low-temperature (R23) compressors of the two groups of refrigeration units are lower than the normal values, and the suction pressure is evacuated, indicating that the refrigerant capacity of the main refrigeration unit is insufficient.


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