The old method of repair and maintenance of screw chiller

The old method of repair and maintenance of screw chiller

With the development of economy and the improvement of production process requirements, screw chillers have become an important aspect of most enterprises’ production cooling needs. Therefore, screw chillers are used more and more widely in enterprises. However, any product is often used in the process. Some failures occur more or less, and screw chillers are no exception. Today, the okmarts.com editor specially summarized the common problems of screw chillers in operation, including the cause analysis, inspection and solutions of the failure, hoping to help friends.

　　 1. Exhaust pressure of screw chiller is too high

　　 1. The condenser inlet water temperature is too high or the flow is not enough: check the cooling tower, water filter and various water valves;

　　 2. There is air or non-condensable gas in the system: it should be eliminated according to the fault display;

　　3. Serious scaling in the condenser clearance: clean the copper pipe;

　　4. Too much refrigerant charge: the excess part needs to be discharged;

　　5. The intake valve on the condenser is not fully opened: check and fully open;

　　6. The suction pressure is higher than the normal situation: refer to the troubleshooting of ‘inspiratory pressure too high’;

　　 2. Exhaust pressure of screw chiller is too low

　　 1. The water flow through the condenser is too large: At this time, the valve should be adjusted down;

　　2. The inlet water temperature of the condenser is too low: adjust the cooling water tower fan speed or the number of fans.

　　 3. A large amount of liquid refrigerant enters the compressor: check the expansion valve and its temperature sensing bulb;

　　4. Insufficient refrigerant charge: charge the refrigerant to the specified amount;

　　5. The suction pressure is lower than the standard: refer to the troubleshooting of ‘inspiration pressure too low’;

　　 3. The suction pressure of the screw chiller is too high

　　 1. Overcharge of refrigerant: Excess refrigerant needs to be eliminated according to standards;

　　2. At full load, a large amount of liquid refrigerant flows into the compressor: check and adjust the expansion valve and its temperature sensor;

　　 Fourth, the suction pressure of the screw chiller is too low

　　 1. The condenser refrigerant liquid outlet valve is not fully opened: the valve should be fully opened;

　　2. The refrigerant filter is clogged: clean or replace the filter regularly;

　　 3. Improper adjustment or failure of expansion valve: Correct adjustment or troubleshooting is required, and replacement if necessary;

　　4. Insufficient refrigerant charge: it should be replenished to the specified amount;

　　 5. Excessive lubricating oil circulates in the chiller refrigeration system: the cause should be found out and reduced to an appropriate value;

　　6. ​​The inlet water temperature of the evaporator is too low: increase the inlet water temperature setting;

　　 7. The amount of water passing through the evaporator is insufficient: check the water pump and water valve;

　　 5. Screw chiller compressor can't run

　　 1. The overload protection is disconnected or the control circuit fuse is blown: check the cause, and replace if it is burned out;

　　 2. Poor contact of the control circuit: regular and timely maintenance to avoid larger accidents;

　　 3. The compressor relay coil is burnt out: it should be replaced in time;

　　4. Phase error: It should be adjusted correctly in time;

Of course, the failures that may occur during the operation of screw chillers are far more than these five. The editor of okmarts.com just summarizes the most common ones to help find them as early as possible and effectively prevent and eliminate them to ensure the normal operation of the unit. A major factor in extending the service life of screw chillers.