How to determine the temperature and humidity test chamber electrical or compressor failure?
What constitutes a high-low temperature humid heat test box? What are the usage steps and how does the compressor fail when the compressor fails? This chapter gives a brief introduction to these issues. One of the high and low temperature test boxes is the main unit, and the other is the auxiliary unit. When the cooling rate is relatively high, the two units work at the same time. At the beginning of the temperature maintenance period, the two units still work simultaneously.
If the low temperature can not control the high and low temperature hot and humid test chamber, we must first check the refrigeration compressor, electrical system and refrigeration system. The main reasons for the unreliable low-temperature damp heat test chamber are refrigeration compressors and electrical system analysis. First, observe whether the refrigeration compressor of the high-low temperature damp heat test box can be started during operation. If the high-low temperature damp heat test box compressor is in operation, Both can start, indicating that the electrical lines from the main power source to the compressors are all normal, and there is no problem with the electrical system.
Analysis of the refrigeration system: First, check the two groups of refrigeration compressors in the high-low temperature damp heat test chamber. If the exhaust and suction pressures of the low-temperature compressors are lower than the normal values, and the suction pressure is in an empty state, this indicates that the main refrigeration unit The amount of refrigerant is obviously insufficient. Then touch the exhaust and suction piping of the R23 compressor of the main unit of the high-low temperature damp heat box. If the temperature of the exhaust pipe is not high, the temperature of the suction pipe is not low (unfrosted). This also explains the lack of R23 refrigerant in the host group of the high-low temperature humid heat test box.
When the temperature of the high-low temperature damp heat test box is initially stabilized, the auxiliary unit stops working, and the host group maintains the temperature drop and stability. If the host R23 of the high-low temperature damp heat test box is leaked, the cooling effect of the host group will be small. Since the two units work at the same time during the cooling process, there is no phenomenon that the temperature cannot be stabilized, and the indicated cooling rate decreases. In the temperature maintenance phase, once the auxiliary unit stops working, the main unit has no cooling effect, and the air temperature in the high-low temperature damp heat test chamber will slowly rise. When the temperature rises to a certain degree, the control system will start the auxiliary unit to cool down again. Then, the auxiliary unit of the high-low temperature damp heat test box stops working again. If so, there will be a failure phenomenon that the low temperature cannot be maintained. Then, it was confirmed that the cause of the failure of the high-low temperature damp heat test box was the leakage of refrigerant R23 of the low-temperature (R23)-class unit of the main refrigeration unit.
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