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July 19, 2022
Fault analysis: first investigate whether the high and low temperature box refrigeration compressor can be started during the operation of the high and low temperature test chamber. If the high and low temperature box compressor can be started during operation, it is explained from the main power supply to each high and low temperature box compressor. All electrical circuits are normal and there is no doubt about the electrical system. When there is no doubt about the electrical system of the high and low temperature box, continue to check the refrigeration system. First look at the two sets of refrigeration compressors in the high and low temperature box. If the low temperature (R23) compressors, the exhaust and suction pressures of the compressors are lower than normal, and the suction pressure is in a state of suction, which clarifies the amount of refrigerant of the main refrigeration unit. Significantly missing. In this case, touch the exhaust and suction pipes of the main unit R23 compressor of the high and low temperature box. If you find that the temperature of the exhaust pipe is not high and the temperature of the suction pipe is not low (no frost), This also clarifies the lack of R23 refrigerant in the host group. One of the high and low temperature test chamber is the main unit and the other is the auxiliary unit. When the cooling rate is large, the two groups of units work together, and the two groups of units still work together during the temperature persistence period. When the temperature starts to stabilize, the auxiliary unit will stop operation and the main engine unit will keep the temperature down and stable. If the main engine group R23 leaks, the cooling effect of the main engine group will be insignificant. Because the two units work together during the cooling process, there is no sign that the temperature is unstable, which indicates that the cooling rate decreases. During the temperature persistence period, if the auxiliary unit stops working and the main unit has no cooling effect, the air temperature in the high and low temperature test chamber will slowly rise and when the temperature rises to a certain level, the control system will start the auxiliary unit to cool down and then assist The unit stops working again, and repeats this way, it will show the appearance of a problem that the low temperature cannot be maintained.
So far, it has been admitted that the cause of the fault of the high and low temperature box is the leakage of refrigerant R23 of the low temperature (R23) level unit of the main refrigeration unit.
Repair method of high and low temperature test chamber: For leak detection of the refrigeration system of the high and low temperature test chamber, use a combination of leak detector and soapy water to check where the leak is. If it is found that the valve stem of the hot gas bypass solenoid valve is cracked If there is a small seam, replace this solenoid valve. If other local leaks are found, use oxygen welding to repair the leaks, and then refill the system with fluorine, and the system can be restored to normal operation.