Because the air-cooled chiller is installed outdoors, it is easily affected by outdoor sunlight. How to maintain good ventilation, good environment and space has a direct impact on the refrigeration effect of water chillers. Air-cooled water chillers often fail in operation, and the reasons and treatment methods are as follows:
(1) Frequent start and stop of the compressor: too much or too little refrigerant may cause the pressure protection switch to operate, and the exhaust pressure is too high or the suction pressure is too low. In addition, the circulation of water system is not smooth, and the surface of evaporator is frosted.
Processing method; When it is determined that there is too much refrigerant, the excess refrigerant can be released at the exhaust port. If not, check whether there is fluorine leakage and replenish refrigerant.
Check whether the water circulation system is blocked or there is air, and discharge it. If the circulating water volume is too small, an open chilled water circulation system can be adopted.
(2) There is noise when the compressor is running: check whether the expansion valve is out of order, and the temperature bag is separated from the compressor suction pipe, so that the liquid refrigerant can flow back to the compressor. If it is damaged, it should be repaired. If the compressor is damaged, it should be replaced.
(3) Insufficient refrigeration capacity: the reason for insufficient refrigeration capacity may be insufficient refrigerant and low evaporation temperature; The cold insulation effect of the pipeline is not good; The condenser of the unit has poor heat dissipation; Excessive resistance of water circulation system and other reasons.
Check whether the refrigerant pipeline leaks during treatment, and replenish 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) The compressor suction pipe is frosted; It may be that the drainage of the system is not smooth or the flow of chilled water is too large, the system pipeline is blocked and the flow is too small.
The pipes should be unblocked and the air should be released.
(5) The condensation pressure is too high: when there is too much refrigerant; Excessive external air temperature will lead to poor ventilation of the unit; When there is air or non-condensable gas in the refrigeration 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 up a sun shelter, etc.). ); Open the exhaust destination exhaust.
(6) The condensation pressure is too low: the refrigerant may be insufficient or the compressor may be damaged. Check whether there is leakage during treatment, replenish refrigerant after repair, and check the compressor. If it is damaged, it should be replaced.
(7) Excessive suction pressure: too much refrigerant and too much heat load. Improper adjustment of expansion valve may lead to excessive suction pressure.
Treatment methods: discharge excess refrigerant, reduce the amount of chilled water, reduce the heat load, and readjust the opening of expansion valve.
(8) The suction pressure is too low: the refrigerant may be insufficient; Expansion valve opening is too small; If the equipment pipeline in the water system is blocked, check whether there is leakage, replenish refrigerant after repair, and adjust or replace the expansion valve.
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