The central air conditioning condenser is very easy to scale, and daily water treatment should be done normally in the summer cooling period. Otherwise, when running in the environment of high hardness water quality, the inorganic salts dissolved in water in the circulating water system will crystallized out with the increase of temperature, forming scale on the tube wall of the condenser heat exchange surface, resulting in reduced heat exchange efficiency. At the same time, the hard scale increases, the energy consumption increases, and the hard scale increases by 6% to 10% when it is 1mm thick. Next, we and Jingle central air conditioning maintenance network small series together to look at the detailed introduction.

Cleaning technology of central air conditioning host condenser evaporator

Because the soil, sediment and humus of water form dirt, and the biological mud formed by bacteria, algae and other microorganisms and their secretions will adhere to the wall of the condenser heat exchange tube to form mud and dirt, which will cause pipeline blockage in serious cases. Dirt and mud will affect the heat exchange efficiency, consume more power, cause high pressure operation, and cause overpressure shutdown in serious cases. All these seriously affect the normal operation of the condenser.

Condenser cleaning is divided into physical cleaning and chemical cleaning, physical cleaning generally uses high pressure water jet to clean out the dirt of condenser copper pipe; If the scale is hard scale, chemical cleaning should be carried out, and the scale cannot be removed by physical means. In order to make the condenser operate in an optimized state, it is necessary to carry out special chemical treatment of the condenser, remove scale, rust, mud, sterilization and corrosion prevention treatment, and reduce to a clean metal surface.

Central air conditioning cleaning process such as:

1, the cooling water in and out of the condenser valve is closed, the use of thermometer tube, pressure gauge tube or sewage pipe connected to the anti-corrosion pump, liquid distribution box into a small circulation system, cycle cleaning.

2, first add pickling corrosion inhibitor, this agent is a special copper corrosion inhibitor, which is attached to the inner wall of the condenser metal to prevent acid and metal reaction.

3, add solid pickling cleaning agent, used to clean calcium carbonate scale as the main component of the scale, cleaning agent is a complex solid organic acid, white crystal, non-corrosive to metal, weak acid; The amount of cleaning agent depends on the amount of scale buildup in the equipment.

4. Add dirt stripping agent (optional). If the scale of the condenser equipment is thick, it is necessary to add dirt stripping agent to promote the rapid dissolution of the product after scale reaction in water and speed up the deep scale reaction

5, add neutralizing passivation agent, chemical cleaning in the condenser, neutralize residual acid, prevent metal surface oxidation and secondary floating rust.

6, cleaning process:

A. Cleaning temperature: Generally at room temperature cleaning, if the scale is thick can be cleaned at 40℃~50℃ to improve the cleaning speed.

B. Close the valve in and out of the unit, and use the pressure gauge or thermometer tube, anti-corrosion pump, acid tank to form a cleaning circulation system. The corrosion inhibitor is added first when cleaning, and the organic acid is slowly added after the corrosion inhibitor is recycled evenly. The reaction situation should be regularly detected during cleaning, and the cleaning agent should be supplemented when it is insufficient to ensure that there is enough acid and scale reaction. The appropriate amount of dirt scale stripping agent and defoamer can be added according to the scale reaction situation during cleaning.

C. After the maintenance and cleaning of Kunshan central air conditioning, the remaining liquid should be discharged, and the water should be added to rinse.

D. After cleaning the condenser, it is also necessary to add a neutralizing passivation agent to neutralize residual acid to prevent oxidation of the inner wall of the metal.

E. The condenser cleaning time is about 5 to 10 hours, depending on the actual situation.