Beijing Yashilin Test Equipment Co., Ltd. summarizes the following reasons for the slow cooling rate of the high and low temperature test chamber based on years of perfect after-sales service and tracking service system:
1. The temperature cannot be maintained. Observe whether the refrigeration compressor is started during the operation of the test box and the compressor is started during the operation of the environmental test equipment, indicating that the electrical circuit from the main power supply to each compressor is normal and there is no problem in the electrical system.
2. If there is no problem with the electrical system, check the refrigeration system. If the discharge and suction pressure of the low-temperature (R23) compressors of the two groups of refrigeration units are checked to be lower than normal, and the suction pressure is evacuated, it means that the main refrigeration unit has insufficient refrigerant quantity.
3. Touch the exhaust and suction lines of the R23 compressor of the refrigeration host group with your hands. If the temperature of the exhaust line is not high, the temperature of the suction line is not low (no frost), which means that the compressor The R23 refrigerant of the host group is lacking.
4. Refrigerant leakage, check for dew point. The compressor is the main unit and the other is the auxiliary unit. When the cooling rate is large, the two groups of units work at the same time. At the beginning of the temperature maintenance stage, the two groups of units still work at the same time. After the temperature stabilizes initially, the auxiliary unit stops working, and the host group maintains the temperature stability. If the host group R23 leaks, the cooling effect of the host group will be insignificant. Since the two units are working at the same time during the cooling process, there is no phenomenon that the temperature is not stable, and the cooling rate is indicated to decrease. In the temperature maintenance stage, once the auxiliary unit stops working and the main unit has no cooling effect, the air in the test chamber will slowly rise. 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 point. Near the set value, and then the auxiliary unit stops working again, so repeatedly, it will produce a fault phenomenon. The cause of the failure is the refrigerant R23 leakage of the low-temperature (R23) unit of the host group. Check the refrigeration system for leakage, use a combination of leak detector and soapy water to check, and replace the solenoid valve accordingly. The machine is recharged with fluorine.
For the inspection and judgment of the equipment failure of the high and low temperature test chamber, it is necessary to fully understand the operation principle, working process and composition structure of each part of the test chamber. This operation is recommended to be carried out by professional maintenance personnel, non-professional Persons should not do it without permission.
The crux of the slow cooling rate of the high and low temperature test chamber
Huai 'an Bst Trade Co., LTD , https://www.bstoral.com