Solutions to failures of air-cooled screw chillers

Jul 23, 2021

The air-cooled screw chiller is a screw chiller that uses fans to dissipate heat. The installation environment it needs must be open and easy to circulate, so that this operation will not affect the cooling effect of the air-cooled screw chiller .


Therefore, we should understand some common faults of air-cooled screw chillers and some troubleshooting methods:


1. The fan noise of the air-cooled screw chiller is too loud


Bearing component wear/excessive clearance: If it is worn, it should be replaced in time, and if the clearance is too large, it can be directly adjusted to a suitable position;


The speed is too high: it can be improved by reducing the speed, if it is not solved, replace the fan;


2. The temperature rise of the motor of the air-cooled screw chiller fan is too high


The flow exceeds the rated value: the valve needs to be closed at this time;


Motor or power supply problems: find out the reasons for the motor and power supply;


3. The bearing temperature of the air-cooled screw chiller fan increases


The fan shaft and the motor shaft are different: they need to be adjusted to be concentric;


Bearing damage: need to replace a new bearing, or directly contact the chiller manufacturer to replace it.


Insufficient lubricating oil (grease) or poor quality: If the lubricating oil is not enough, the company should fill it up to the required part; if there is a quality problem, it is necessary to clean the bearing or replace the more qualified lubricating oil (grease);


4. The air output of the air-cooled screw chiller fan is too small:


Blockage of air inlet, outlet and pipe: check and remove the blockage;


Insufficient valve opening, speed, and belt slack: you can check the bearing by adjusting the valve opening to a proper opening, tightening and replacing the belt, and checking the voltage.


Check that the connection between the impeller and the shaft is loose, which can be eliminated by direct prohibition; if the gap between the impeller and the air inlet is too large, it should be adjusted to a suitable gap.


The fan of the air-cooled screw chiller is equivalent to the cooling tower cooling system of the water-cooled chiller. If the heat dissipation effect is not good, the cooling capacity of the air-cooled screw chiller is absolutely insufficient, which directly affects the company’s refrigeration Water demand. Therefore, we need to maintain and maintain our chillers in a timely manner.

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