The reasons for low suction pressure of cold storage refrigeration units may include the following aspects:
Refrigerant filter blockage: The refrigerant filter plays an important filtering role in the operation of the unit. If it is blocked, it is very easy to cause low suction pressure. Therefore, it is necessary to clean or replace the refrigerant filter regularly to ensure that it is unobstructed.
The expansion valve is set incorrectly or faulty: The main function of the expansion valve is to throttle and reduce the pressure of high-pressure liquid refrigerant to adapt to changes in refrigeration load and prevent liquid hammer in the compressor. If the expansion valve is set incorrectly or fails, it will lead to poor refrigeration effect, frost after the valve, etc., which will affect the suction pressure. Therefore, the expansion valve should be set correctly and replaced when necessary.
The condenser refrigerant outlet valve is not fully opened: If the refrigerant drain valve of the condenser is not fully opened, the refrigeration unit will have a low suction pressure. In order to ensure the normal operation of the refrigeration system, ensure that the valve is fully opened.
Insufficient water flowing through the evaporator: Insufficient water in the evaporator will lead to a decrease in cooling capacity and poor cooling effect, which will affect the suction pressure. Therefore, users should regularly check the working status of the water pump and water valve to ensure sufficient water.
Excessive oil content in the system: If the lubricating oil content in the refrigeration system is too high, the suction pressure will be reduced. When the lubricating oil content in the system is found to be too high, the cause should be found out and reduced to a reasonable level.
Compressor failure: As the core component of the cold storage refrigeration system, the compressor will cause pressure imbalance once it fails, which will cause abnormal suction pressure. Therefore, it is necessary to regularly check and maintain the compressor to ensure its normal operation.
The ambient temperature is too low or the air inlet is blocked: If the temperature around the cold storage is too low or the air inlet is blocked, it will cause poor air circulation, unbalance the pressure inside the cold storage, and affect the suction pressure. In this case, the ambient temperature should be adjusted and the air inlet should be cleaned.
In summary, there are many reasons for the low suction pressure of the cold storage refrigeration unit, involving multiple components of the refrigeration system and external environmental factors. In order to ensure the normal operation and refrigeration effect of the cold storage, the refrigeration system should be inspected and maintained regularly to find and solve potential problems in time. At the same time, attention should also be paid to adjusting environmental factors to provide a good operating environment for the refrigeration system.