Troubleshooting of refrigeration system failure of material aging test equipment at low temperature

Regular maintenance work for the material low temperature and high temperature aging test system, and troubleshooting of the refrigeration system is also very important. Here are a few tips.

1. Exhaust at double high pressure, heat dissipation may be problematic.
When it is detected that the high and low pressure of the system are higher than normal, it is usually because there is air in the system or excessive refrigerant is added. At this time, it is necessary to re-evacuate and add proper amount of refrigerant to solve the problem. But there is another situation, that is, poor heat dissipation, especially when the ambient temperature is relatively high, which often results in worse heat dissipation. The cause of this failure is generally that the heat sink is blocked, dirty, and the speed of the heat dissipation fan is not enough.

2. Refrigerant with low pressure loss, otherwise the system will be blocked.
When the high and low pressures are both low, there are two possibilities:
(1) If the system is blocked, the blocked part will produce throttling, and there will be a significant temperature difference in the throttling part, and the problem can be found by feeling it with your hands.
(2) The leakage of refrigerant leads to insufficient refrigerant. This situation is more common. At this time, the material’s low temperature and high temperature aging test equipment detector must be used to find out the leaking location and perform replacement.

3. Replace the compressor with low pressure, high pressure and low pressure.
When the pressure gauge of the material low temperature and high temperature aging test equipment detects that the low pressure is higher than normal, and the high pressure is lower than normal, at this time, it is recommended that the chiller refrigeration cannot achieve the effect of the normal material low temperature and high temperature aging test equipment. The reason is likely to be wear in the pump, resulting in a drop in power. At this time, it is often necessary to replace the compressor to solve the problem.

4. There is water vapor in the meter shake system, so it must be changed when it is exhausted.
When the refrigeration system of the material low temperature and high temperature aging test equipment is working, if the pressure gauge needle keeps shaking, it means that the system has moisture. To solve this problem, it is generally necessary to re-evacuate, and the pumping time must be no less than 15 minutes. If necessary, the drying bottle needs to be replaced to drain the water in the system.