Legionnaires' disease is an acute respiratory infection caused by Legionella pneumophila. The main symptoms are fever, chills, headache, lethargy and myalgia. Legionella pneumophila can be transmitted through air currents, especially through unclean water-cooled central air conditioners, and there is no direct human-to-human transmission.

Virus transmission routes are complex and diverse, and the way of transmission through central air conditioning is also a common one. Based on the wide range of use of central air conditioning, the use of space personnel is relatively concentrated, strong mobility, once there is infection, the consequences are very serious. Therefore, during the epidemic, the cleaning and disinfection of central air conditioning is essential and crucial.

Unclean water-cooled air conditioning systems have a very important impact on the spread of Legionella pneumonella, which shows how important it is to clean the central air conditioning water system. Today, Kunshan central air conditioning maintenance Xiaobian to talk about the importance of central air conditioning water system cleaning.

First, central air conditioning water system cleaning and maintenance suggestions

1, before the air conditioning operation, the water system should be cleaned to remove welding slag, oil, etc., during the installation process. It is worth noting that when cleaning the dry pipe of the refrigerant water system, the inlet valve of the evaporator, air cabinet and fan coil of the cold source unit should be closed first, and the bypass valve should be opened so that the sewage can be discharged from the pipe through the bypass valve. The evaporator, air cabinet and fan coil should be cleaned separately.

2, in the operation process, the water quality should be monitored every one to two weeks, the PH value should be adjusted within the specified range (6 to 8), the concentration of cooling water is controlled at about 2.5 to 3.5, at the same time, the system should be timely sewage and water supply.

3, reasonable water treatment, according to the water quality, add corrosion and scale inhibitor, dispersant and bactericidal algaecide on time, in order to reduce corrosion, prevent scale formation and algae, bacteria reproduction. Zinc-chromate and zinc-polyphosphate are commonly used as corrosion inhibitors. Polyphosphate and polyacrylic acid were used as scale inhibitors. Chlorine or hypochlorite may be used as a bactericide.

4. Regularly clean the sediment and debris in the filter and decontaminator on the cycle road.

5, the cooling water should be discharged after the shutdown, for the refrigerant water, if the water quality meets the requirements, you can not discharge, but if it is shut down in winter, in order to prevent the pipeline from freezing crack, you need to discharge all the water in the system. After the water discharge, the decontaminator and filter should be thoroughly cleaned.

Other studies have shown that reducing the inlet and outlet temperature of the cooling tower to 20 ~ 30 ° C, controlling the cooling water flow speed in the cooling water system within the range of 1.8 ~ 2.5m/s, can control the breeding rate of fungi, while the calcium and magnesium ions in the water are not easy to accumulate scale, which is one of the key ways to avoid the cleaning and maintenance of the central air conditioning water system.

Second, the central air conditioning water system cleaning construction steps

1, bactericidal algae: by adding bactericidal agents to the circulation system, remove various bacteria and algae in the circulating water.

2. Slime stripping: Add stripping agent, peel off the biological slime in the pipeline, and clean the slime out through circulation.

3, chemical cleaning: Add chemical cleaning agent, dispersant, the pipeline system in the floating rust, scale, oil cleaning down, dispersed discharge, reduced to a clean metal surface.

4, surface pre-film: pre-film agent is put into the metal surface to form a dense polymeric polymer protective film to prevent corrosion.

5, daily maintenance: add corrosion inhibitor, avoid metal rust, at the same time add scale inhibitor, through the comprehensive effect, prevent calcium and magnesium ion crystallization precipitation, and regular sampling, monitoring water quality.

In the later use of Kunshan central air conditioning installation process, if the system appears more serious odor, rust, scaling and other phenomena, you need to carry out a comprehensive cleaning of the water system, which requires a professional system maintenance company to the equipment site sampling, investigation, comprehensive diagnosis, and then determine the specific cleaning program.

In addition to water system central air conditioning, there are fluorine system central air conditioning. Compared with the central air conditioning of the water system, the later maintenance of the fluorine system is simple and the cost is small, and the self-cleaning central air conditioning of the fluorine system is available on the market.