screw chiller unit

First, screw chiller commissioning open the refrigeration system valve start debugging, if you find that the refrigerant has been leaking or insufficient, you should first find out the leakage point and exclude leakage phenomenon, and then according to the requirements of the product manual, plus the specified brand of refrigerant, pay attention to the refrigerant charge should be in line with technical requirements.

After the end of refrigerant charging, load commissioning can be carried out. Many screw-type chiller units in the official start-up before the main electronic control system can be done to simulate the action check side, that is, the unit host is not energized, the control system is energized, and then through the unit's internal settings, the unit's electronic control system to detect whether the component is running normally. If there is any problem with the electronic control system, it can be solved in time. Finally, the host is powered on again for debugging.

In the commissioning process, special attention should be paid to the following points:
1) Check whether the valves in the refrigeration system are in a normal open state, especially the exhaust shut-off valve, do not close.
2) Open the cooling water valve of the condenser and the cold water valve of the evaporator, and the flow rate of the cold water and cooling water should be in accordance with the requirements put forward by the factory.
3) Before starting, observe whether the supply voltage of the unit is normal. Start the unit according to the start-up manual provided by the factory.
4) When the unit is started, check whether the parameters of the unit are normal according to the start-up manual provided by the factory. Record the data of the screw chiller unit, especially some major parameters must be recorded clearly.
5) During the operation of the screw chiller, attention should be paid to whether the upper download mechanism of the compressor is working properly.
6) should be correctly used in the refrigeration system installed in the safety protection devices, such as high and low pressure protection devices, cold water and cooling water cut-off flow switch, safety valves and other equipment, if damaged should be replaced in a timely manner.
7) Screw chiller should be shut down immediately for inspection if any abnormality occurs.
Before the commissioning of the refrigeration system, be sure to do a good job of cleaning and drying the inside of the system. If the preliminary work is not carried out carefully, it will increase a lot of workload during the commissioning period, and it will bring a lot of hidden dangers to the operation of the refrigeration unit in the future.

Screw chiller start-up operation
1) Confirm whether the state of each relevant valve in the unit meets the start-up requirements. Supply power to the electrical control device of the unit and turn on the power switch so that the power control indicator is on.
2) Start the cooling water pump, cooling tower fan and chilled water pump, you should be able to see the operation indicator light of the three. Detect whether the lubricant oil temperature reaches 30 ℃. If less than 30 ℃, you should open the electric heater for heating, and at the same time can start the oil pump, so that the lubricating oil cycle temperature rises evenly.
3) Close the compressor power supply, start the control switch. If the cooling water temperature is low, you can temporarily turn off the cooling tower fan.
4) chilled water pumps, cooling water pumps, cooling tower fan running sound, vibration, the pump's outlet pressure, water temperature and other indicators are within the normal operating parameters.