If the suction pressure of a chiller is abnormally low during operation, it may be due to a variety of factors. Below we will analyze these potential faults and their countermeasures one by one:
* Obstacle 1: Blockage of the refrigerant filter. This filter plays a key role in filtering the refrigerant, and it is crucial to ensure that it is unobstructed. Once blocked, the filter needs to be cleaned or replaced regularly.
* Obstacle 2: Improper adjustment or failure of the expansion valve. In this case, correct adjustment or timely troubleshooting should be made quickly, and the expansion valve should be replaced if necessary.
* Obstacle 3: The refrigerant liquid outlet valve of the condenser is not fully opened. This situation will cause the suction pressure of the refrigeration unit to decrease. The solution is to ensure that the valve is fully open.
* Obstacle 4: Insufficient evaporator water flow. This will weaken the cooling effect and reduce the cooling capacity. Users should check the working status of the water pump and water valve to ensure that they are operating normally.
* Obstacle 5: Excessive lubricating oil in the refrigeration system of the chiller. Once it is found that there is too much lubricating oil in the system, the cause should be quickly identified and adjusted to the appropriate amount.
* Obstacle 6: The evaporator inlet water temperature is set too low. At this time, the inlet water temperature setting value should be appropriately increased to improve the cooling effect.
* Obstacle 7: This item is repeated with Obstacle 4, but emphasizes the importance of users checking the water pump and water valve in time when the water volume is insufficient.
In addition, the cooling water circulation loop of the chiller is usually open, and tap water is circulated through the cooling tower. If the calcium and magnesium salts in the water are high, it is easy to form scale on the cooling water pipe, which affects the heat transfer. When the scale is too thick, it will reduce the cooling water flow cross-section and reduce the water volume, which will lead to an increase in condensing pressure. To avoid this problem, it is recommended that users develop a regular cleaning plan when they find that the water quality is poor, and clean the cooling water pipe at least once a year to remove scale and other contaminants and keep the pipe unobstructed.
If the user still cannot determine the problem after eliminating the above seven faults, it is recommended to contact the maintenance service provided by the manufacturer for further inspection and repair.