With the development of China's economy and the improvement of production process requirements, screw chillers have become an important aspect of the cooling demand of most enterprises, and screw chillers are increasingly used in enterprises.

▲ Shangyi water-cooled screw chiller

During the use of the screw chiller, some damage is also difficult to avoid.

The following small series will introduce the common problems of the screw chiller in operation, including the analysis of the cause of the failure, inspection and solution, I hope to be helpful to everyone.

Screw chiller exhaust pressure is too high

◎ The condenser inlet water temperature is too high or the flow rate is not enough: check the cooling water tower, water filter and each water valve;

◎ There is air or non-condensing gas in the system: it should be excluded according to the fault display;

◎ The fouling inside the condenser is serious: cleaning the copper pipe;

◎ Excessive refrigerant charging: need to discharge excess parts;

◎ The intake valve on the condenser is not fully open: check and fully open;

◎ Inspiratory pressure is higher than normal: Refer to ‘Inspiratory pressure too high’ for fault handling.

Screw chiller exhaust pressure is too low

◎ The water flow through the condenser is too large: the valve should be adjusted at this time;

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

◎ A large amount of liquid refrigerant enters the compressor: check the expansion valve and its temperature sensing package;

◎ Insufficient refrigerant filling: charge the refrigerant to the specified quantity;

◎ Inspiratory pressure is lower than standard: Refer to 'Inspiratory pressure too low' for fault handling.

Screw chiller suction pressure is too high

◎ Excessive refrigerant charging: Excess refrigerant should be excluded according to the standard;

◎ At full load, a large amount of liquid refrigerant flows into the compressor: check and adjust the expansion valve and its temperature sensing package.

Screw chiller suction pressure is too low

◎ The condenser refrigerant liquid outlet valve is not fully open: the valve should be fully opened;

◎ Refrigerant filter blockage: Regularly clean or replace the filter;

◎ Inadequate adjustment or failure of the expansion valve: Correct or troubleshoot the adjustment and replace if necessary;

◎ Insufficient refrigerant filling: should be added to the specified amount;

◎ Excessive lubricating oil circulates in the chiller refrigeration system: the cause should be identified and reduced to a suitable value;

◎ The inlet temperature of the evaporator is too low: increase the inlet temperature setting value;

◎ Insufficient water volume through the evaporator: check the water pump and water valve.

Screw chiller compressor can not run

◎ Overload protection is disconnected or the control line fuse is blown: check the cause, if it is burnt, replace it;

◎ Poor control of the control line: regular and timely maintenance, so as to avoid a larger accident;

◎ Compressor relay coil burnout: should be replaced in time;

◎ Phase error: It should be adjusted correctly in time.

Of course, screw chillers can have more than five failures.

In the course of operation, we need to carefully maintain, find faults, problems and prevent and eliminate them as soon as possible, so as to ensure the normal operation of the unit and extend the service life of the screw chiller.

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Industrial refrigeration, chiller, Water-cooled screw chiller, industrial chiller, screw chiller, air-cooled chiller, buy products on the Shanghai Shangyu Refrigeration Equipment Co., Ltd., the company is a refrigeration equipment research and development, design, production, sales And high-tech enterprises, such as installation.

At present, Shanghai SUNNY-HVAC's Water-cooled screw chiller, industrial refrigeration, chillers, chillers, Water-cooled screw chiller, screw chillers, and air-cooled chillers have been widely used in chemical, chemical fiber, plastic, grease, food, Pharmaceuticals, military industry, printing, coating, electroplating, electronics and other industries provide high-speed development of China's industry with efficiency and quality assurance.