First observation of high and low temperature chamber refrigeration compressor in the high and low temperature test chamber will be able to start running process, if the compressor in the running process of the high and low temperature chamber of to be able to start, from the main power supply to the compressor of the electric circuit is normal, high and low temperature chamber electrical system there would be no problem.
When there is no problem with the electrical system of the high and low temperature test chamber, continue to check the refrigeration system.
First check the two groups of the high and low temperature chamber of refrigeration compressor unit, if the low temperature stage compressor exhaust and suction pressure is lower than normal, and inspiratory pressure in time state, which means the main refrigeration unit refrigeration dose obviously deficiencies.
Again with the hand to touch the main unit of the high and low temperature box of R23 exhaust and suction pipe of the compressor, such as found that the temperature of the exhaust line is not high, the temperature of the suction piping is not low (frost), it also illustrates the main unit R23 lack of refrigerant.
High and low temperature test chamber of a main unit, another for auxiliary units, the cooling rate is large, two groups of the unit to work at the same time, the temperature keep the early stage, the two groups of the unit is still working at the same time.
When the temperature is initially stabilized, the auxiliary unit will stop working and the main unit will maintain the temperature cooling and stability.
R23 reveal that if the main unit, will make the main units of cooling effect is not big, because the cooling process, the two units work together at the same time, so there is no temperature stability of phenomenon, and instructs the cooling rate is reduced.
In temperature stage, once the auxiliary units to stop working, and the main unit and no cooling, high and low temperature test of the air temperature in the cabinet will slowly rise, when the temperature rises to a certain extent, control system will again start the auxiliary unit to cool, then auxiliary units to stop working, and so on, then there will be a failure phenomenon of low temperature keep not to live.
So far, it has been confirmed that the fault of the high and low temperature box is caused by the leakage of refrigerant R23 from the low temperature (R23) level unit of the main refrigeration unit.
High and low temperature test chamber maintenance methods: refrigeration system of high and low temperature test chamber leak, leak detector, and the combination of soap and water way to check where is funnelled, if discovery is the hot gas bypass solenoid valve stem crack for thin seam, replace the electromagnetic valve, the rest of the leak is found, with oxygen welding will leak repair welding is complete, again on the system to fluorine, system can resume normal operation.
Is high and low temperature test chamber for the above analysis of low temperature cannot keep the fault phenomena, analyze and judge from easy to difficult, basically outside before, after the first electric air conditioning mode analysis and judgment, familiar with and understand the principle of high and low temperature test chamber and working process is the basis of analyzing the fault judgment.
Only by deeply understanding the working principle and working process of high and low temperature test box can all kinds of problems of high and low temperature test box be solved quickly.