It is unavoidable that the chiller works to produce sound. For example, the fan rotates and the fan blades rub against the air, which will produce sound. Normal sounds are allowed, but serious, sudden, harsh, and irregular noises are worthy of our attention!
By listening we can find the approximate location of the noise and then do further processing. The following are some common causes of noise and solutions, Xiaobian will take you to take a look!
First, find the reason from the components that are easy to troubleshoot and observe:
1. Is the anchor screw loose?
The chiller is fixed on the ground and has been running for a long time. If the anchor bolts are loose, the chiller will be unstable and cause noise. This situation can be solved by replacing the anchor bolts. If conditions permit, vibration reduction can also be installed. The purpose is to make the chiller firmly fixed on the ground.
2. Is the connection pipeline firm?
There are large and small pipes on the chiller, which are connected to the chiller, cooling equipment and other auxiliary devices. If the connecting screws are loose, noise will be generated after operation. The solution is to fix the pipes and equipment.
3. Is there any problem with the fan?
The air-cooled chiller is equipped with a fan fan, which is composed of a fan cover and blades. The blades are deformed by external force, and noise will be generated after rotation. The fan cover will also cause noise due to the entry of dust and debris. By replacing the blades and regularly cleaning the top of the fan fan debris to reduce noise.
Then we observe whether the following components have abnormal noise:
4. Whether the water pump is abnormal
Most of the reasons for the abnormal sound of the water pump are that the water quality is not clean enough to cause the water pump pipeline to be blocked, resulting in abnormal working noise and noise. The circulating water needs to be treated to meet the requirements of the chiller.
5. Does the compressor make any abnormal noise?
The abnormal noise of the compressor is a relatively important problem. Because the compressor is the "heart" of the chiller, special attention should be paid to the abnormal noise. There are three main reasons for the abnormal noise of the compressor:
Reason 1: Liquid refrigerant enters the compressor
Once the liquid refrigerant enters the compressor, because it cannot be compressed, it will generate hydraulic pressure to cause liquid shock to the internal structure, resulting in vibration or sound. In addition, too much refrigerant will dilute the refrigeration oil and cause wear and tear of mechanical parts.
Solution: Check whether there is too much refrigerant, and release the excess refrigerant; check the opening of the expansion valve, whether it is too large, and adjust it in time.
Reason 2: Excessive refrigeration of oil causes liquid shock
Solution: Check the refrigeration oil in the compressor and adjust it to an appropriate amount.
Reason 3: Abnormal noise of compressor cylinder and crankshaft
It is generally caused by the lack of lubricating oil, which causes abnormal wear and tear of the internal components of the compressor, resulting in abnormal noise, which will also affect the operation of the compressor and reduce the service life of the equipment.
In this case, it is necessary to repair or replace the compressor. It is worth noting that the condition of the chiller and the compressor should be checked regularly, which can effectively avoid this situation.
Some people in the industry have encountered such a situation. Due to the poor oil return of the oil return pipe and the lack of refrigeration oil, the compressor crankshaft sleeve is damaged, causing a lot of noise and aggravating wear and tear.
It is normal for a normal chiller to have a little noise, but irregular and sudden noises should attract our attention. Here is a brief summary of the causes of chiller noise: loose connecting screws, abnormal noises from fans and fans, and pumps, Excessive refrigerant, and excess refrigeration oil.

Semi-Hermetic Industrial Chiller