Analysis of the failure of constant temperature and humidity box without cooling

Because customers often encounter the situation that the constant temperature and humidity equipment is not cooling, so here today with everyone to study and study, the following opinions are for reference only.

Analysis one:

1. Because the temperature cannot be maintained, observe whether the refrigeration compressor can be started 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 system.

2. 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.

3. 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 the main unit The lack of R23 refrigerant.

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