What should be prepared before the central air conditioner starts, come and see!

What should be prepared before the central air conditioner starts, come and see!

In recent years, with the rapid development of central air-conditioning in China, central air-conditioning is frequently touched during work and day. Everyone is enjoying the comfort brought by central air-conditioning, and often overlooks the cleanliness of central air-conditioning. The sanitary condition is very worrying. Therefore, the central air conditioner must pay special attention to cleaning and maintenance during the use process.

　　Central air conditioners usually have the characteristics of messy structure, expensive, high precision, etc., so it is difficult to clean. On the one hand, the central air-conditioning cleaning must ensure that it can achieve a certain cleaning effect, on the other hand, it must not cause too much damage to the equipment itself.

　　Because the central air conditioner has a messy structure and it is difficult to disassemble the device, it is not suitable for disassembly and cleaning. Generally speaking, chemical cleaning is the best way. The key to chemical cleaning is to choose an appropriate cleaning agent and use precise cleaning methods. The primary skills are as follows:

　　 1. Determine the amount of dirt:

　　We can’t calculate the amount of dust accurately. Therefore, in order to ensure the thoroughness of cleaning, we usually choose the part with relatively more dust for sampling. Under normal circumstances, 25px can be taken as a sample from the dusty part and then measured.

　　 2. Choose cleaning drugs:

　　In the selection of cleaning chemicals, the key skills include the selection of cleaning agents, selection of passivating agents, determination of acid concentration and temperature.

　　 (1) As far as the current situation is concerned, most cleaning agents use acid. Acids can be divided into two categories: organic acids and inorganic acids. Organic acids include acetic acid, citric acid, EDTA, etc. From a generalized perspective, it is more appropriate to choose dilute hydrochloric acid with relatively little damage to equipment.

(2) The selection of passivation agent should consider passivation and environmental protection together. After the dust is cleaned, it is necessary to immediately passivate the appearance of the equipment. The purpose is to form a protective film on the metal surface to avoid long periods of time with the air. Touch causes corrosion. In summary, it is better to choose phosphate, usually trisodium phosphate is used as passivation agent.

　　 Three, clear cleaning methods

　　(1) Water flushing can be carried out. Usually, a combination of cyclic flushing and displacement cleaning is used. When the water is flushed, it can be cleaned separately until the discharged water has no obvious dirt.

　　(2) The peeling operation is then carried out, and the adhesion of the slime can be used to complete the peeling of dust. Participate in the ooze cycle for 24 hours, and then wash the ooze out with clean water. The pH value in the pipeline is controlled between 5 and 6 for soaking and activation. The process needs to continue for 24 hours

　　 (3) Then pickling is carried out. During pickling, the acidity and iron content should be measured every 20 minutes, and the two indicators are relatively stable and punctual to complete the pickling. The final passivation treatment, after changing to tap water, add passivation agent and continue for several hours.

　　 Central air conditioning cleaning skills are relatively messy, but only need to follow some principles, select appropriate cleaning chemicals, and go through precise processes and methods to achieve excellent cleaning effects. In addition, there are many local requirements for current cleaning skills. For example, trisodium phosphate used as a passivating agent, in practice, the time to form a passivation film is still relatively long, but in generalized thinking, we have to accept this. One disadvantage. But with technological innovation and improvement, these shortcomings will surely be resolved in the near future.