1. The compressor starts and stops frequently: it may be that too much or too little refrigerant causes the pressure protection switch to act, the exhaust pressure is too high or the suction pressure is too low, the water system circulation is not smooth, and the evaporator surface is frosted. Treatment method: When it is determined that there is too much refrigerant, the excess refrigerant can be discharged from the exhaust port. If it is insufficient, please check whether there is fluorine leakage and replenish the refrigerant. Check the water circulation system for blockage or air and exhaust. If the circulating water volume is too small, an open chilled water circulating system can be used.
2. The compressor is noisy during operation: check whether the expansion valve fails, whether the temperature package is separated from the compressor suction pipe, and whether the liquid refrigerant returns to the compressor. If damaged, repair it. If the compressor is damaged, replace it.
3. Insufficient cooling capacity: The reasons for insufficient cooling capacity may be insufficient refrigerant, low evaporation temperature, poor pipe cooling effect, poor heat dissipation of unit condenser, and excessive resistance of water circulation system. Check the refrigerant pipeline for leakage during processing, and replenish the refrigerant after repair; Repair the cold insulation layer; Clean the condenser and check whether the fan operates normally; Clean the pipeline filter to make the system circulate smoothly.
4. Frost on the suction pipe of the compressor: it may be due to poor drainage of the system or excessive flow of chilled water, blockage of the system pipeline, and low flow. The pipes shall be cleaned and ventilated.
5. High condensation pressure: when there is too much refrigerant; The outdoor air temperature is too high, resulting in poor ventilation of the unit; When there is air or non-condensable gas in the refrigerant system, the condensation pressure will be too high. Treatment method: discharge excess refrigerant; Adjust and improve the ventilation environment around the unit (such as setting sunshade, etc.); Open the exhaust hole to exhaust.
6. The condensation pressure is too low: the refrigerant may be insufficient or the compressor may be damaged. Check for leakage during handling. Replenish the refrigerant after servicing and checking the compressor. If damaged, replace it.
7. Excessive suction pressure: too much refrigerant and too much heat load. Improper adjustment of the expansion valve may cause high suction pressure. Treatment method: discharge the excess refrigerant, reduce the amount of frozen water, reduce the heat load, and readjust the opening of the expansion valve.
8. The suction pressure is too low: the refrigerant may be insufficient; The opening of expansion valve is too small; The equipment and pipeline in the water system are blocked. You can check whether there is leakage, add refrigerant after maintenance, adjust or replace the expansion valve.
