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Constant temperature and humidity chamber (high and low temperature test chamber) failure phenomenon constant temperature and humidity chamber (high and low temperature test chamber) failure cause analysis:
Constant temperature and humidity chamber (high and low temperature test chamber) equipment does not cool down or slow down
Insufficient refrigerant capacity in refrigeration system (fluorine leakage)
The solenoid valve of the refrigeration system pipeline is dirty or blocked by ice. The solenoid valve that supplies liquid to the evaporator damages the flow rate of the expansion valve is too large or too small or damages, and the fluorine is replaced by the blocked device or the desiccant replaces the solenoid valve to adjust or replace the expansion. valve
The constant temperature and humidity chamber (high and low temperature test chamber) equipment heats up slowly. The heat insurance of the heater is blown. The contactor of the heater is controlled to be damaged. Replace the heat insurance replacement contactor.
Constant temperature and humidity chamber (high and low temperature test chamber) system does not work Centrifugal fan does not run fan insurance burnout, replace insurance; fan thermal protection, reset protection switch.
Constant temperature and humidity chamber (high and low temperature test chamber) compressor does not run the compressor's insurance burnout power supply voltage is not enough control compressor start contactor damage replacement insurance supply voltage replacement contactor
Constant temperature and humidity chamber (high and low temperature test chamber) Exhaust pressure is too high. There is insufficient air cooling water in the refrigeration system or the temperature is too high. The condenser water pipe is too thick, the air is increased, the water supply is increased, and the condenser is cleaned.
Constant temperature and humidity chamber (high and low temperature test chamber) Insufficient pressure is too low. Refrigeration system is insufficient. The amount of refrigerant is insufficient. The expansion valve is blocked by ice or the filter is damaged. The pipe is dried or the expansion valve is replaced.
Constant temperature and humidity chamber (high and low temperature test chamber) system can not humidify the humidification of the humidification boiler. The contactor of the humidification boiler is damaged. The humidification boiler protects the replacement of the fuse due to lack of water. Replace the contactor to replace the float switch or water supply.
Constant temperature and humidity chamber (high and low temperature test chamber) system can not dehumidify the compressor used for dehumidification does not start dehumidification solenoid valve does not work, refer to the troubleshooting method of the compressor does not work, solve the problem
Analysis of some faulty method phenomena
1) The test chamber can be cooled, indicating that the external factor cooling water can be eliminated.
2) Since the temperature is not maintained, observe whether the refrigeration compressor can be started during the operation of the test chamber.
The compressor can be started during the operation of the test box, indicating that the electrical circuit from the main power supply to each compressor is normal, and there is no problem in the electrical system.
3) There is no problem with the electrical system and continue to check the refrigeration system. First check the low temperature of the two groups of refrigeration units (R23)
The exhaust and suction pressures of the compressors are lower than normal, and the suction pressure is evacuated, indicating that the refrigerant capacity of the main refrigeration unit is insufficient. Touching the exhaust and suction lines of the R23 compressor of the main unit by hand, it is found that the temperature of the exhaust line is not high, and the temperature of the suction line is not low (not frosted), which also indicates the R23 of the host group. Lack of refrigerant,
The system leaks fluorine.
4) The cause of the failure has not been determined, and the cause of the failure is further confirmed in conjunction with the control process of the test box, which has two sets of refrigeration units. One is the main unit and the other is the auxiliary unit. When the cooling rate is large, the two sets of units work at the same time. In the initial stage of the temperature maintenance stage, the two units still work at the same time. When the temperature is initially stabilized, the auxiliary unit stops working.
The temperature is stabilized by the host group. If the host group R23 leaks, the cooling effect of the host group will be small. Because the two units work at the same time during the cooling process, there is no temperature stability, and the cooling rate is lowered. During the temperature maintenance phase, once the auxiliary unit stops working, the main unit has no cooling effect, and the air in the test chamber will rise slowly.
When the temperature rises to a certain level, the control system will start the auxiliary unit to cool down and lower the temperature to the set value (-55 ° C).
Nearby, then the auxiliary unit stops working again. If it is repeated, the fault phenomenon shown in Figure 3 will appear. At this point, the cause of the production failure has been confirmed to be that the refrigerant R23 of the low temperature (R23) stage unit of the main unit leaks.
5) Checking the refrigeration system, using a combination of a leak detector and soapy water, found that the stem of a hot gas bypass solenoid valve cracked a slit of about 1 cm. Replace the solenoid valve, refill the system with fluorine, and the system is operating normally. As can be seen from the above, the analysis and judgment of the fault phenomenon is basically easy and difficult. First, in the “outside and backâ€, first analyze and judge the context of the “electrical after†refrigeration, familiar with and understand the test box. The principle and working process are the basis for analyzing faults to determine faults.
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How to analyze the failure of the constant temperature and humidity test chamber and the high and low temperature test chamber Generally speaking, the process of analysis and judgment can be first "outside". That is to say, firstly exclude external factors, such as cooling water, power supply, etc. After completely eliminating external factors, according to the fault phenomenon, the system is first systematically decomposed and the system is comprehensively analyzed and judged, and the cause of the fault can be found by using the reverse method: first Find out if there is a problem with the electrical system according to the electrical wiring diagram, and finally find out whether the refrigeration system is a problem, and provide an analysis table of some common faults.