What should I do if the suction pressure of the refrigeration unit is too low?

Update:31 May 2021
Summary:

In the process of using the refrigeration unit, many us […]

In the process of using the refrigeration unit, many users often find that the freezing effect of a certain day is suddenly not as good as before or why it is not freezing? According to the industry, the refrigeration unit is not cooled well, which means that the suction pressure of the refrigeration unit is too low.
   Then, what is the reason for the low suction pressure of the refrigeration unit? How should users solve this problem? In this regard, some manufacturers’ technicians said that, in fact, there are many reasons for the low suction pressure of the refrigeration unit, including the refrigerant filter clogging the valve, not fully opening, and insufficient refrigerant filling. The following is a brief introduction to common faults and their solutions.
  Fault 1: The refrigerant filter is clogged. The refrigerant filter has an important filtering function and should be kept unblocked. If clogging occurs, the filter should be cleaned or replaced regularly.
   Fault 2: Improper adjustment or failure of the expansion valve. If this phenomenon occurs, it is recommended to correct or troubleshoot immediately, and replace it if necessary.
   Fault 3: The condenser refrigerant liquid outlet valve is not fully opened. If the condenser refrigerant liquid outlet valve is unsafely opened, the refrigeration unit will produce a situation where the suction pressure is too low. At this time, please fully open the valve.
  Fault 4: Insufficient water in the evaporator. In this case, the amount of freezing will also decrease and the freezing effect is not good. The user should check the pump and valve in time.
  Fault 5: Excessive lubricating oil circulates in the chiller refrigeration system. If you find that there is a lot of lubricating oil in the refrigeration system, you should find the cause and reduce it to an appropriate value.
   Fault 6: When the evaporator immersion temperature is too low, the freezing effect is poor. The set value of the inlet water temperature should be increased.
   Fault 7: Insufficient water in the evaporator. In this case, the amount of freezing will also decrease and the freezing effect is not good. The user should check the pump and valve in time.
   In addition, because the cooling water of the refrigeration unit is an open loop, the tap water generally used is recycled through the cooling tower. When the content of calcium salt and magnesium salt in the water is large, it is easy to decompose and deposit on the cooling water pipe to form scale, which affects heat transfer. When the scale is too thick, the flow cross-section of the cooling water is also reduced, the water volume decreases, and the condensation pressure rises.
   When the user finds that the quality of the cooling water used in the refrigeration unit is poor, they should regularly clean the cooling water pipe at least once a year to remove the dirt and other dirt in the pipe and prevent the pipe from being blocked.
   Eliminate the above 7 faults, if the user can not find the reason, you can contact the manufacturer for maintenance services.Shanghai Zhaoxue Refrigeration Equipment Co., Ltd. is professional Refrigerated Units Manufacturers and cold storage supplier in China

Low-Temperature Scroll Integrated Refrigeration Unit

Low-Temperature Scroll Integrated Refrigeration Unit

Applicable Cold-Storage Temp. 5 ~ -30℃
Power Supply 380V/3N~/50Hz
Refrigerant R404A Pre-Charged
Control Mode Smart Hot-Gas Defrost on Demand,Dua EXV,Economizer/Oil Sep/Pressure Sensor/All-in-one Intelligent Controller/LED+LCD Display,etc
Throttling Mode Double Electronic expansion valve + Economizer.