1. Rapid rise and fall temperature test chamber compressor efficiency is low

[Fault Analysis] The low efficiency of the refrigeration compressor means that the actual exhaust gas volume decreases and the cooling capacity responds less when the operating conditions are constant. This phenomenon occurs mostly on compressors that have been used for a long time, and the wear is large, the clearance of each component is large, and the sealing performance of the gas valve is lowered to cause the actual exhaust gas to decrease.

[Remedy] Check if the cylinder head paper pad is broken down and cause leakage; check whether the high and low pressure exhaust valve pieces are closed tightly; check the matching clearance between the piston and the cylinder.
2. The frost on the surface of the evaporator is too thick [Fault analysis] The cold storage evaporator of the rapid rise and fall temperature test chamber should be timed for defrosting. If there is no defrosting, the frost layer on the evaporator line will accumulate thicker and thicker. When encased in a transparent ice layer, heat transfer will be seriously affected, causing the temperature inside the chamber to fall within the required range.
[Remedy] Stop the defrosting, open the library door to let the air circulate, and use the fan to accelerate the circulation and reduce the defrosting time.
3. There is refrigeration oil in the evaporator pipeline [Fault analysis] During the refrigeration cycle, some of the refrigeration oil remains in the evaporator pipeline. After a long period of use, the residual oil in the evaporator will be seriously affected. Heat transfer effect, poor cooling phenomenon.
[Remedy] Remove the freezer oil from the evaporator. The evaporator is removed, purged and then dried. If it is not easy to disassemble, it can be pumped from the evaporator inlet and then blown with a blowtorch.
4. The refrigeration system is not smooth [Fault analysis] Because the refrigeration system is not cleaned, after a certain period of use, the dirt gradually accumulates in the filter, and some of the mesh is blocked, resulting in a decrease in refrigerant flow and affecting the cooling effect. In the system, the expansion valve and the filter at the suction port of the compressor are also slightly blocked.
[Remedy] The micro-blocking parts can be removed, cleaned, and then refilled.
5. Filter blockage [Fault analysis] The desiccant is used for a long time to form a paste to seal the filter, or the dirt gradually accumulates in the filter to cause blockage.
[Remedy] Remove the filter, wash it, dry it, replace it with a new desiccant, and load it into the system.
6. Expansion of refrigerant in the temperature sensor of the expansion valve [Fault analysis] After the temperature sensor is leaked in the temperature sensor of the expansion valve, the two forces below the diaphragm push the diaphragm upward, the valve hole is closed, and the refrigerant in the system cannot be By causing no cooling, the expansion valve is not frosted at this time, the low pressure is vacuum, and the airflow sound is not heard in the evaporator. Wuhan Anderson Testing Equipment Co., Ltd. professional maintenance quick rise and fall temperature test chamber

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