Seven common faults and solutions of chillers-Shenzhen Oukelong Technology Industrial Co., Ltd

Seven common faults and solutions of chillers

1、 What should I do if the temperature difference between the inlet and outlet of the chiller is small?
When users encounter this situation when using a chiller: the company is using a chiller, and the current inlet temperature is 24 ℃ and outlet temperature is 23 ℃, the temperature difference is too small to meet the user's needs. There are several main reasons for the small temperature difference between the inlet and outlet water:
1. The output cooling capacity of the chiller unit is small, for example, if the unit itself has faults or is not fully loaded, these can be preliminarily judged by observing parameters such as the operating current of the chiller unit.
2. It may also be due to poor heat transfer efficiency, such as severe scaling of the heat transfer tubes, which affects the heat transfer of the chiller unit. This can be judged by observing the heat transfer temperature difference between the water temperature and the evaporation temperature.
3. Excessive water flow can be determined by observing the pressure difference between the inlet and outlet of the evaporator, as well as the operating current of the water pump.
4. After eliminating the above issues, you can consider whether the sensor or temperature gauge is inaccurate.
2、 The fan of the chiller produces noise
Noise is a annoying sound, and continuous noise can also pollute the surrounding environment. The reasons for the noise generated by the fan of a general chiller can be described as follows:
When the blades rotate, they will generate friction or impact with the air. The frequency of noise is composed of multiple frequencies, all of which are related to the speed of the fan. Suggestion: If an axial flow fan is equipped with both moving and stationary wings, it is best to have an unequal number of blades between the two to avoid causing greater noise resonance.
When vortices are generated by the blades, noise is also produced. During the operation of the fan, vortices are generated on the back of its moving wings, which not only reduce the efficiency of the fan but also generate noise. To reduce this phenomenon, the installation angle of the blades should not be too large, and the bending of the fan blades should be smooth and not suddenly change too much.
Resonance occurs with the outer shell of the air duct, resulting in noise. The joint between the inner surface of the air duct and the fan casing should be smooth to avoid roughness and unevenness, which may cause tearing sounds. In addition, during design, it is sometimes possible to cover the outside of the air duct with soundproof materials to reduce noise.
In addition, there are many sources of noise besides the fixed noise of the fan itself. For example, bearings may produce abnormal noise due to insufficient precision, improper assembly, or poor maintenance.
3、 Communication malfunction
The control of various modules by the computer controller is achieved through communication lines and the main interface board. The main causes of communication failures are poor contact or disconnection of communication lines, especially poor contact caused by moisture and oxidation of interfaces. In addition, failures of unit electronic boards or main interface boards, improper selection of address dip switches, and power failures can all cause communication failures.
4、 Low voltage fault
The suction pressure of the compressor is too low, causing the low-pressure protection relay to operate. The suction pressure of the compressor reflects the evaporation pressure, and the normal value should be between 0.4 and 0 6MPa, protection value set to 0 2MPa. If the suction pressure is low, there will be less return air and insufficient cooling capacity, resulting in waste of electrical energy. Poor heat dissipation of the compressor motor for return air cooling can easily damage the motor.

Seven common faults and solutions of chillers

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