Reasons and solutions for the low suction pressure of the refrigeration unit

1. The refrigerant filter is clogged. The refrigerant filter plays an important filtering role in the operation of the unit. If the filter is blocked, it will easily cause the suction pressure to be too low.

Solution: Clean or replace the filter.

2.The expansion valve is installed incorrectly or blocked. The function of the expansion valve is to throttle and decompress the high-pressure liquid refrigerant to adapt to the change of refrigeration load and prevent the compressor from liquid hammering. If the expansion valve is installed incorrectly or blocked, the cooling effect will be poor, and frost will form behind the valve.

Solution: replace the expansion valve.

3.The refrigerant outlet valve of the condenser is not fully opened. If the valve is not fully opened, the refrigeration unit will have a low pressure situation.

Solution: Open the valve fully.

4.Insufficient water passing through evaporator. Insufficient water in the evaporator will also cause a decrease in cooling capacity and poor cooling effect..

Solution: Check whether the water pump and water valve are working normally.

5.Too much oil in the system. If the system contains too much oil, the suction pressure will be reduced.

Solution: Drain the oil.

Reasons and solutions for industrial chillers not cooling

1.Lack of refrigerant. During the operation of the chiller, the liquid refrigerant flowing through the evaporator continuously absorbs the heat in the water and begins to evaporate. After being compressed by the compressor and throttled by the expansion valve, it becomes a low-temperature and low-pressure refrigerant. That is, the refrigerant exchanges energy with the outside world through the change of thermal state, so as to achieve the purpose of producing cooling capacity. Therefore, if the chiller lacks refrigerant, it will inevitably affect heat absorption, resulting in low cooling efficiency.

Solution: add refrigerant.

2.The condenser is dirty. The condenser is directly involved in the key components of refrigeration. The cooling water used by the chiller contains calcium and magnesium ions and acid carbonate, which will form rust. The generation of rust will directly lead to poor heat exchange effect of the condenser, and serious scaling will block the pipes, affecting the heat exchange effect.

 Solution: check, descale and maintain the condenser.

3.Improper position of slide valve, blockage of suction filter, wear of moving parts, insufficient fuel injection, unopened suction stop valve, leakage of refrigerant, scaling of evaporator, etc. will all cause insufficient cooling capacity.

Solution: adjust the slide valve.

4.Clean or replace the filter, maintain the rotor and bearing wear, find the cause of insufficient fuel injection and replenish oil, open the suction stop valve, find the refrigerant leakage point, check the evaporator, and descale and maintain.

Causes and solutions of high voltage alarm failure

1. The frequent start and stop of the compressor may be due to the low oil level, causing an alarm.

Solution: Add refrigeration oil and check whether there is oil leakage in the compressor.

2. Dirty blockage of the pipeline of the chiller system will cause the cooling water or refrigerated oil to fail to return to the compressor normally, and then an alarm will appear.

Solution: clean the system pipeline.

3.The cooling water flow rate is small, which will cause the compressor to start frequently and alarm.

Solution: Open the water valve, if the cooling water flow rate is still low, check whether the pipe is dirty or blocked.

4.Too much refrigerant in the chiller will cause the exhaust temperature to be too high, and an alarm will also appear to protect the operation of the compressor.

Solution: Let professional engineers handle the refrigerant, and it is not recommended for users to discharge it privately.

5. The poor heat dissipation of the condenser of the chiller will also cause the alarm of the exhaust pressure to be too high.

Solution: Check and clean the dust on the surface of the condenser, and clean the copper tube of the condenser.

6.The expansion valve of the chiller is opened too large, which will lead to an increase in the refrigerant flow rate and a decrease in superheat.

Solution: Properly reduce the opening degree of the expansion valve, and restart the machine after stopping the machine to check the cause.

Cause analysis and solution of low voltage alarm failure

1.Insufficient refrigerant will cause the chiller to have a low-pressure alarm, and a serious shortage of refrigerant will cause the unit to shut down for protection.

Solution: Check for leaks on the chiller, such as leak checks for pipe joints, and replenish refrigerant after the cause is found out.

2.Excessive water volume or fouling of the chiller condenser will lead to low water temperature and poor heat dissipation.

Solution: reduce the amount of water or use part of the circulating water to clean the copper tube of the condenser.

3.The leakage of the suction and exhaust valves of the chiller will lead to the leakage of refrigerant gas, the reduction of exhaust volume and the decrease of cooling capacity.

Solution: Have a professional engineer check the cause of valve leakage and replace the valve.

4.Frosting on the evaporator of the chiller will also cause the suction pressure to be too low.

Solution: Have a professional engineer check the cause of frost and defrost.

5.Dirty blockage of the filter screen of the evaporator of the chiller will also cause the suction pressure to be too low.

Solution: Clean or replace the filter according to the situation.