Comprehensive Insights into Large - Temperature - Difference Ice - storage Air - Conditioning Systems
2025-04-04
- Check the machine room records to understand the reasons for shutdown.
For units that have been shut down normally for more than three days and nights, experienced operators should be invited to start the machine. For units that have shut down due to accidents and undergone maintenance (including medium - scale or large - scale repairs), the person in charge or technical personnel should be invited to guide the startup. - Compressor inspection:
① For open - type compressors, check whether there are any obstacles in the transmission and operating parts, and whether the protection devices are in good condition.
② For compressors equipped with an oil sight glass, check whether the oil level is normal.
③ For Freon refrigeration compressors equipped with an oil heater, power on and heat before startup to volatilize the Freon dissolved in the oil, so that the oil pump can work properly. The heating time shall be subject to the regulations in the product manual.
④ The pressure gauge valve should be opened, and observe whether the pressure is normal.
⑤ For the oil circuit system equipped with an oil three - way valve, confirm that the handle of the oil three - way valve is pointed at the working position.
⑥ Compressors with an energy - regulating device or unloading device should be set at the minimum load or no - load position.
⑦ For open - type compressors, check the shaft seal.
If there is a valve in the return oil pipe of the mechanical shaft seal, it should be opened. The gland of the packing shaft seal should be slightly loosened.
- Check whether the opening and closing of each manual valve on the refrigeration system pipeline are correct.
- Check whether the stop valves in front of the safety valves, pressure gauges, liquid level indicators, etc. on each device and each pressure - equalizing valve are opened.
However, the charging valve, the oil discharge valve and the air - release valve on the oil collector and air - release device, etc. should be closed.
- Check whether the refrigerant liquid level in equipment such as the liquid receiver is within the required range.
- Check whether there are any obstacles in the operating parts of the water pump and fan, and whether the motor and each device are normal.
- For water - cooled condensers, open the inlet and outlet water valves of the condenser. Close the valve of the horizontal shell - and - tube condenser and open the air - vent valve.
Start the water pump to supply water to the condenser, the compressor water jacket and the crankcase oil cooler. Close the air - vent valve as soon as water gushes out. - Connect the power supply and get ready to start.
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