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How to maintain the screw chiller with EVR/MSV refrigeration solenoid valves?

2019-06-18
The correct commissioning of the screw chiller is an important part of ensuring the normal operation of the refrigeration unit, saving energy consumption and prolonging the service life. For on-site installation of large and medium-sized refrigeration systems, the requirements should be familiar with the layout and connection of the entire system, the outline structure and component performance of each equipment, as well as the electronic control system and water supply system. To this end, engineers such as refrigeration and hydropower should participate in the commissioning. Users should carefully read the product operation manual provided by the factory before commissioning, and proceed step by step according to the operation requirements. The operator must undergo special training from the factory to obtain the operation certificate of the unit before the operation can be carried out, so as to avoid fatal damage to the unit caused by wrong operation.



Screw chiller commissioning

1) Charge of refrigerant. At present, the refrigeration unit is generally filled with refrigerant before leaving the factory. After the installation on site, if no accidental damage is found in the visual inspection, the relevant valve can be opened directly (you should read the manufacturer's instruction manual first, in transit, on the unit). The valve is normally in the off state) for commissioning. If the refrigerant has been leaked or insufficient, first find the leak point and eliminate the leak, then add the required grade of refrigerant according to the product instruction manual. Note that the refrigerant charge should meet the technical requirements.

2) Some screw-type chillers need to be filled with refrigerant at the user's site. The refrigerant charge and refrigerant grade must be in accordance with regulations. The refrigerant charge is insufficient. Will result in insufficient cooling. Excessive refrigerant charge will not only increase the cost, but also adversely affect the operating energy consumption.

3) Before charging the refrigerant, sufficient refrigerant should be prepared in advance. When filling, it can be directly charged from the special filling valve. Since the system is in a vacuum state, the pressure difference between the refrigerant and the system in the cylinder is large. When the valve is opened (the air in the connecting pipe should be blown out with the refrigerant first, so that the air does not enter the unit and affect the performance of the unit), the refrigerant is quickly replaced by the cylinder. In the flow system, after filling, the liquid filling valve should be closed first, and then the connecting pipe should be removed.

4) Refrigeration system commissioning. After the refrigerant is charged (if the refrigerant needs to be charged), the load can be debugged. In recent years, screw chillers have made great progress in performance and electrical control. Many screw chillers can perform analog operation check on the main electronic control system before the official start-up, that is, the main unit of the unit is not energized, and the control system Power on, and then through the internal settings of the unit, the unit's electronic control system is tested, and the components are running normally. If there is any problem with the electronic control system, it can be resolved in time. Finally, connect to the host power supply for debugging. During the debugging process, special attention should be paid to the following points:


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