Several methods of central air conditioning cleaning

Several methods of central air conditioning cleaning:

1. Cleaning of air conditioning water system

Because the inner surface of the air-conditioning water pipe is mainly composed of Ca2+, Mg2+, Fe2+ and other compounds, that is, scale, which is neutral. Use 8‰~10‰ neutral descaling agent, corrosion inhibitor, and coating water solution to clean three times. Circulate continuously for 12 hours once, circulate continuously for the second time for 6 hours, and circulate continuously for the third time for 1 hour, and check the water quality and the surface condition of the water pipe in time. The Shanghai Central Air Conditioning Project reminds that under normal circumstances, it can be cleaned three times. For the air-conditioning water pipes that have not been cleaned for a long time, the cleaning time should be extended appropriately when cleaning the third time.

2. Cleaning of cooling water system

Because most of the cooling water system is an open circulation system, the cooling water is in contact with the air for a long time, and the CO2, SO2, NO2, O2 and other gases in the air will dissolve in the cooling water and show acidity and strong oxidation (such as the impeller of the cooling water pump). Cavitation occurs). Over time, the cooling water pipe, the surface of the packing, and the water collecting tray form a kind of attachment of pathogenic microorganisms containing Legionella pneumophila, b-hemolytic streptococcus, algae, O2+, etc., which seriously corrodes the water pipe and pollutes Environment (acid rain near the cooling tower). Therefore, use an acidic cleaning agent for cleaning, and use a five-thousandth weak acid detergent, corrosion inhibitor, and coating aqueous solution to clean three times. The cleaning procedure is the same as above.

3. Cleaning of the ventilation duct system

The cleaning of the ventilation duct system is a key difficulty in the cleaning work, because the ventilation ducts are generally in the ceiling, even if they are not in the ceiling, because the air ducts are sealed and connected, it is difficult to clean, and mechanical cleaning methods are often used. The common cleaning method now is to place the inspection robot or pneumatic robot in the ventilation duct from the soft joint of the canvas of the unit, and control the cleaning robot in the ventilation duct through the robot control box outside the duct. A duct dust collector must be used to collect garbage in the pipeline to prevent secondary pollution.

4. Cleaning of surface cooling, heating, humidifier surface, condensate water tray inner surface, and return air outlet

The cleaning of the surface cooling, heating, humidifier, and return air vent can not only improve the air quality, but also have a strong energy-saving effect. The commonly used cleaning method is to use air spray cleaning agent, and then use high-pressure water or air to purge, so that the contaminants are quickly dissolved and blown off, and then rinsed with low-pressure water.

The contaminants attached to the outer surface of the surface cooler contain pathogenic microorganisms such as hemolytic streptococcus. After the fins are cleaned, most of them flow into the condensate water tray. Long-term accumulation will cause secondary pollution of the water tray and accompanied by peculiar smell. Air-conditioning maintenance companies feel that the cleaning of the condensate tray cannot be ignored. The common way to clean the condensate pan is to spray detergent on the condensate pan and then rinse it with clean water.