Three aspects carefully observe the prevention of chiller operation failure
As a chiller operation operator, the following methods can be used to reduce the occurrence of faults:
Observe the size of the high and low pressure values in the chiller operation. The size of the hydraulic pressure, the level of cooling water and the inlet and outlet water pressures of the chilled water, etc. These parameter values are normal to meet the requirements of the set operating conditions, and the values of the parameters that deviate from the working conditions are abnormal, each of which is abnormal. Condition parameters may contain certain failure factors. In addition, we must pay attention to look at some of the appearance of the chiller during operation, such as the occurrence of the compressor suction tube frost phenomenon, it indicates that the chiller cooling capacity is too large, the evaporation temperature is too low, the compressor suction superheat is small , Inspiratory pressure is low. This will probably cause a "liquid hammer" phenomenon for piston chillers.
At the same time, on the basis of comprehensively observing the operating parameters of each part, we will further experience the temperature of each part, and touch the parts and pipes of the chiller by hand to feel the operating temperature and vibration of the compressor, the inlet and outlet temperatures of the evaporator/condenser, and the pipe joints. Oil traces and distributions at the site. Under normal conditions, the compressor runs smoothly, the suction and exhaust temperature difference is large, the temperature rise of the engine is not high, the evaporation temperature is low, the temperature difference between the inlet and outlet of the chilled water is large, the condensing temperature is high, and the temperature difference between the inlet and outlet of the cooling water is large; Refrigerant leaks are free from oil contamination; any performance contrary to the above conditions means that there is a fault factor at the corresponding location.
In addition, through the abnormal sound of the chiller in operation, the traits and position of the fault are analyzed and judged. In addition to listening to whether the total sound of the chiller runs in accordance with the sound laws of normal work, it is important to listen to the compressor, lubricant pump, system solenoid valve, throttle valve and other equipment for abnormal sound. For example, the piston compressor in operation may emit a slight “buzzing, squeaking, squeaking” sound or a continuous, even slight “buzzing, squeaking” sound, which indicates that the compressor is operating normally; if it is heard, “dub-a-dub” "Sound or impeller when the fast and slow rotation sound, or there is an abnormal vibration sound, indicating that the compressor has a liquid hit or surge.
The above is a little experience and suggestions from the Anyda chiller manufacturer to prevent failures in the operation of chillers, hoping to help new and old customers.