How to maintain and upkeep industrial refrigeration units
The compressor of the refrigeration unit is a crucial component in the unit, and the quality of the compressor directly affects the stability of the unit.
1. Replace lubricating oil
After long-term use, the lubricating oil quality of the refrigeration unit deteriorates, and impurities and moisture inside the oil increase, so it is necessary to regularly observe and check the oil quality. Once a problem is discovered, it should be replaced in a timely manner, and the lubricating oil brand replaced must comply with the technical specifications.
2. Replace the dry filter
The dry filter is an important component to ensure the normal circulation of refrigerant. Due to the immiscibility of water and refrigerant, if there is moisture in the system, it will greatly affect the operating efficiency of the unit. Therefore, it is very important to keep the internal system dry, and the filter element inside the drying filter must be replaced regularly.
3. Verification of safety valve
The condenser and evaporator on the chiller unit are both pressure vessels. According to regulations, a safety valve should be installed on the high-pressure end of the unit, that is, the condenser body. Once the unit is in an abnormal working environment, the safety valve can automatically release pressure to prevent high pressure from causing harm to the human body. So regular calibration of safety valves is very important for the safety of the entire unit.
4. Cleaning of condenser and evaporator
The cooling water of a water-cooled condenser is usually circulated through a cooling tower using tap water due to its open loop design. When the content of calcium and magnesium salts in water is high, they are easily decomposed and deposited on the cooling water pipes, forming scale and affecting heat transfer. Excessive scaling can also reduce the flow cross-section of cooling water, decrease the amount of water, and increase the condensation pressure. Therefore, when the quality of the cooling water used is poor, the cooling water pipes should be cleaned at least once a year to remove scale and other contaminants from the pipes. There are usually two methods for cleaning the condenser water pipes:
(1) Use a specialized cleaning gun to clean the pipes.
(2) Use specialized cleaning agents to cycle and rinse, or fill with cooling water, and wait for 24 hours before changing the solution until it is thoroughly cleaned.
5. Charging of refrigerant
Unless there are other special reasons, the unit generally does not produce a large amount of leakage. If a certain amount of refrigerant leaks due to improper use or after maintenance It is necessary to add refrigerant again. When filling refrigerant, it is necessary to pay attention to the type of refrigerant used in the unit.