7 Reasons for Low Air Pressure in Cold Water Unit

There are many reasons for the low suction pressure of the refrigeration unit, including blocked refrigerant filter valves, incomplete opening, and insufficient refrigerant charging. Here is a brief introduction to common faults and their solutions.
Fault one: Blockage of the refrigerant filter.

The refrigerant filter has an important filtering function and should remain unobstructed. If clogging occurs, the filter should be cleaned or replaced regularly.

Fault two: Improper adjustment or failure of the expansion valve. If this phenomenon occurs, it is recommended to calibrate correctly or troubleshoot immediately and replace it if necessary.
Fault three: The valve at the refrigerant liquid outlet of the condenser is not fully opened. It is reported that when the valve at the refrigerant liquid outlet of the condenser is not fully opened safely, the refrigeration unit will have a low suction pressure. At this time, the valve should be fully opened.

Fault four: Insufficient water flow through the evaporator. In this case, the cooling capacity will also decrease and the cooling effect will be poor. Users should check the water pump and water valve in time.
Fault five: Excessive lubricating oil circulates in the refrigeration system of the water chiller. If a lot of lubricating oil is found in the refrigeration system, at this time, the reason should be found out and reduced to an appropriate value.
Fault six: When the inlet water temperature of the evaporator is too low, the cooling effect is poor. The set value of the inlet water temperature should be increased.
Fault seven: Insufficient water flow through the evaporator. In this case, the cooling capacity will also decrease and the cooling effect will be poor. Users should check the water pump and water valve in time.
In addition, since the cooling water of the water chiller is an open circulation loop, and generally tap water is used for circulation through the cooling tower. When the content of calcium salts and magnesium salts 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 flow cross-section of the cooling water will also be reduced, the water volume will be reduced, and the condensing pressure will rise."
It is recommended that when users find that the water quality of the cooling water of the refrigeration unit they use is poor, it is recommended to make a regular cleaning plan and clean the cooling water pipe at least once a year to remove scale and other dirt in the pipe, so as to prevent pipeline blockage.
If users still cannot find the cause after eliminating the above seven faults, they can contact the manufacturer for maintenance services.