[[TitleIndustry]]

What if the suction pressure of the refrigeration unit is too low? The causes of 7 major faults need to be known

Date:Dec 26, 2019

[China Refrigeration Network] Refrigeration units are common equipment in medicine, food and other industries, providing reliable guarantee for various low-temperature environments such as pharmacy.  In recent years, with the continuous development of China's pharmaceutical industry and the continuous improvement of requirements for production, logistics and transportation, the refrigeration unit market has welcomed a good development space, and through continuous improvement and upgrading, it has provided pharmaceutical enterprises with higher quality refrigeration unit equipment.  However, when users use refrigeration units, even if they purchase regular brands, major failures do not occur, and minor failures often occur from time to time. Users need to know the common failures of the equipment and the corresponding solutions to ensure that the equipment can continue to operate.


It is understood that many users often find that one day the cooling effect is suddenly not as good as in the past, or not when using the refrigeration unit. What is this?  The industry said that the poor refrigeration of the refrigeration unit meant that the suction pressure of the equipment was too low.


So, what is the cause of the low suction pressure of the refrigeration unit?  How should users solve it?  In response, some factory technicians said that there were many reasons for the low suction pressure of the refrigeration unit, including the refrigerant filter blocking the valve, not fully opening, insufficient refrigerant filling, etc. The following is a brief introduction to common faults and their solutions.


Fault 1: refrigerant filter is blocked.  Refrigerant filter plays an important role in filtration and should be kept unblocked. In case of blockage, the filter needs to be cleaned or replaced regularly.


Fault 2: improper adjustment of expansion valve or failure.  If this phenomenon occurs, it is recommended to immediately correct or eliminate the fault and replace it if necessary.


Fault 3: The condenser refrigerant liquid outlet valve is not fully opened.  It is reported that when the condenser refrigerant liquid outlet valve is not opened safely, the refrigerating unit will have a low suction pressure.  At this time, the valve should be fully opened.


Fault 4: Insufficient water flow through evaporator.  In this case, the refrigerating capacity will also be reduced and the refrigerating effect will be poor.  Users should check the water pump and water valve in time.


Fault 5: Excessive lubricating oil circulates in the cooling system of the water chiller.  If a lot of lubricating oil is found in the refrigeration system, the reason should be found out and reduced to the appropriate value.


Fault 6: When the inlet water temperature of evaporator is too low, the refrigeration effect is not good.  The inlet water temperature setting should be increased.


Fault 7: Insufficient water flow through evaporator.  In this case, the refrigerating capacity will also be reduced and the refrigerating effect will be poor.  Users should check the water pump and water valve in time.


In addition, the technicians said that since the cooling water of the refrigeration unit is an open circulation loop, the commonly used tap water is recycled through the cooling tower. When the calcium salt and magnesium salt content in the water is large, it is easy to decompose and deposit on the cooling water pipe to form scale, thus affecting heat transfer.  "If the scale is too thick, the cross section of cooling water will also decrease, the amount of water will decrease, and the condensation pressure will increase."


For this, the technicians suggest that when users find that the quality of cooling water used by refrigeration units is poor, they should make regular cleaning plans, and clean the cooling water pipes at least once a year to remove scale and other dirt in the pipes, so as to prevent blockage of the pipes.


To eliminate the above seven kinds of faults, if the user still can't find out the reason, he can contact the manufacturer for maintenance services, which is also the important significance of the existence of regular refrigeration unit equipment manufacturers.


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