How to deal with chiller’s high pressure fault ?

High pressure faultof chiller


High pressure fault of chiller refers to the high exhaust pressure of compressor, which causes the high voltage protection relay to work.The exhaust pressure of the compressor reflects the condensation pressure. The normal value should be 1.4~1.8MPa, and the protection value should not exceed 2.0MPa.Because the long-term pressure is too high, will lead to compressor running current is too large, easy to burn the motor, resulting in compressor damage.



1.Excessive refrigerant charging.This situation generally occurs after maintenance, performance for suction and exhaust pressure, balance pressure are on the high side, the compressor running current is also on the high side.

解决方案:discharge refrigerant according to suction and exhaust pressure and balance pressure at rated working conditions until normal.

2.Cooling water temperature is too high, condensation effect is bad.The rated operating condition of cooling water required by the chiller is 30~35℃. High water temperature and poor heat dissipation inevitably lead to high condensation pressure. This phenomenon often happens in high temperature season.



解决方案:if the pipe filter is blocked or too fine, the water permeability is limited, the appropriate filter should be selected and the filter screen should be cleaned regularly.Or the selected pump is small and does not match the system.

4.The condenser scales or clogs.The condensed water is usually tap water, which is easy to scale when the temperature is above 30℃. In addition, as the cooling tower is open and directly exposed to the air, dust and foreign matter can easily enter the cooling water system, resulting in fouling and blocking of the condenser, small heat exchange area, low efficiency, and affecting the water flow.Its performance is the unit in and out of water pressure difference and temperature difference is large, the condenser temperature is very high, condenser liquid copper is very hot.

解决方案:the unit should be back flushed regularly, chemical cleaning and descaling when necessary.



解决方案:this kind of false fault, often on the electronic board of the fault indicator light is not bright or slightly bright, high voltage protection relay manual reset invalid, measure the compressor running current is normal, suction and exhaust pressure is normal.


解决方案:this situation generally occurs after maintenance, vacuum not thoroughly.We could empty the condenser at its highest point or re-vacuum the condenser and add the refrigerant after shut down.

Hero-Tech has professional maintenance staff with 20 years experience. Promptly, accurately, and properly resolve all chiller problems you encounter.

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Post time: Sep-01-2019
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