Causes and Treatment Methods of High Pressure Alarm of Water Chiller

Causes and Treatment Methods of High Pressure Alarm of Water Chiller

During the use of the chiller, the high pressure alarm of the chiller is often encountered. Generally, poor heat dissipation will lead to poor cooling effect of the chiller, and high voltage for a long time will also cause the current to increase and burn out the compressor.

The reasons for the high pressure alarm failure of the chiller are as follows:

(1) The cooling water temperature is too high and the condensation effect is poor. The rated working condition of the cooling water required by the chiller is 30~35°C. The high water temperature and poor heat dissipation will inevitably lead to high condensation pressure. This phenomenon often occurs in high temperature seasons. The reason for the high water temperature may be: cooling tower failure, such as the fan is not turned on or even reversed, and the water distributor does not turn, which means that the temperature of the cooling water is very high and rises rapidly. The outside temperature is high, the waterway is short, and the amount of circulating water is small. In this case, the temperature of the cooling water is generally maintained at a relatively high level.

(2) The cooling water flow is insufficient and cannot reach the rated water flow. The main performance is that the pressure difference between the inlet and outlet water becomes smaller and the temperature difference becomes larger. The cause of insufficient water flow is the lack of water or air in the system. The solution is to install an exhaust valve at a high place in the pipeline for exhaust. The pipe filter is clogged or too fine, and the water permeability is limited. A suitable filter should be selected and the filter screen should be cleaned regularly. The water pump is selected to be small and does not match the system.

(3) Condenser fouling or blockage. Condensed water is generally tap water, which is easy to scale when the temperature is above 30°C, and because the cooling tower is open and directly exposed to the air, dust and foreign matter can easily enter the cooling water system, causing the condenser to be dirty and blocked, and the heat exchange area is small , the efficiency is low, and it also affects the water flow. The performance is that the pressure difference between the inlet and outlet water and the temperature difference become larger, the temperature of the upper and lower parts of the condenser is very high when touched by hand, and the copper tube of the condenser liquid outlet is hot. The equipment should be regularly backwashed and, if necessary, chemically cleaned and descaled.

(4) Too much refrigerant charge. This kind of situation generally occurs after maintenance, and the performance is that the suction and discharge pressure and the balance pressure are high, and the operating current of the compressor is also high. Under the rated working condition, the air should be released according to the suction and exhaust pressure, balance pressure and operating current until it is normal.

(5) The refrigerant is mixed with non-condensable gases such as air and nitrogen. This kind of situation usually occurs after maintenance and the vacuuming is not complete. It can only be drained, re-evacuated, and re-charged with refrigerant.

(6) False alarms caused by electrical faults. Because the high-voltage protection relay is damp, poor contact or damaged, the electronic board of the unit is damp or damaged, and the communication failure causes false alarms. For this kind of false fault, the HP fault indicator light on the electronic board is often off or dimly lit, the manual reset of the high-voltage protection relay is invalid, the computer displays “HPRESET”, or disappears automatically, and the operating current of the compressor is normal, and the suction and exhaust pressure are also normal.

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