Purpose and steps of central air-conditioning duct cleaning

The accumulation of dust in the air duct of the air conditioning system will not only seriously pollute the indoor air, but also increase the resistance of the air duct system and reduce the air volume of the air conditioning system. In addition, the Shanghai Central Air-conditioning Project tells you that the temperature and humidity of the air in the duct are very suitable for the growth and reproduction of certain bacteria, so the air-conditioning duct system itself may be a source of pollution.

one. The main purpose of central air-conditioning duct cleaning

1. For a long time in the air duct system, dust accumulates in the air duct, so that the air conditioning system cannot provide good quality air.

2. The temperature and humidity environment inside the air duct promotes the growth of a large number of bacteria and microorganisms to form a source of infectious diseases.

3. Various infectious bacteria are attached to the free dust particles, which can easily cause cross-infection between groups through the wind circulation system.

4. A large amount of dust accumulated in the air duct will increase the wind resistance, reduce the capacity of the unit, and consume energy.

two. Central air-conditioning duct cleaning process

1. Understand the layout of the fresh air duct, return air duct, and air supply duct system according to the drawings.

2. The unit is cleaned and disinfected with the air duct system.

3. Select the dust suction air outlet and cleaning air outlet.

4. Use the ventilation pipe monitoring and control system to check the pollution degree in the pipeline and the characteristics of the pipeline structure, and select the appropriate cleaning equipment.

5. Equipment and tools go to the designated place, and the items under the construction site are covered with felt cloth. The electrician starts to turn on the temporary power supply, and the technical person in charge finds the construction entry point to clean the air duct.

①. Preliminary preparation.

② Put the blocking system into one end of the uncleaned air duct to fully isolate the cleaning area from the non-cleaning area and avoid secondary pollution.

③. Connect and fix the vacuum dust collection system with the air duct system, and turn on the vacuum cleaner.

④ Put the cleaning robot into the air duct and clean it evenly.

6. After cleaning this section of the air duct, turn off the vacuum cleaner and treat the dirt from the collector.

7. Clean the fire damper in the operation section. If it cannot be cleaned, it should be cleaned at one side of the fire damper.

8. The video surveillance system monitors and records before, during and after air duct cleaning, and saves it.

9. Remove the suction tube and the suction tube tray, restore the cleaned and disinfected tuyere, use the same material of the original system prepared in advance, close the tuyere with a rivet gun, seal the gap with sealant, and restore the insulation material.

10. Check the strength of the air duct ceiling. If the strength is not enough, install expansion bolts on the ceiling and reinforce it with prefabricated angle steel pallets. Do not affect the strength of the air duct as the principle and operate strictly in accordance with the standard. After removing the air outlet and filter, go to the designated place to clean it with a high-pressure water gun.

11. Collect all the cleaned dirt, seal and transport it out, disinfect the dirt, and transport it to the designated place.

12. After cleaning the air duct of a system, organize the site and restore it to its original state.

13. Coil cleaning

① Start the fan coil unit and check its operation status. If there is any abnormality, the construction team leader should fill in the failure confirmation sheet before the fan coil unit construction.

②. Remove the return air vent and filter and clean it with a vacuum cleaner.

③. Disassemble the motor and fan, and clean the fan with a vacuum cleaner.

④. Check the pollution of the cooler of the fan-coil unit, and record or take pictures.

⑤ Check the pollution of the fan, and record or take pictures.

⑥. Use a special vacuum cleaner to clean the dust on both sides of the surface cooler.

⑦. Use a high-pressure spray gun to spray water and add cleaning agent to clean the dirt on the surface device, and rinse with clean water.

14. When the air-conditioning maintenance reminds you to leave the venue, Party A’s unit shall accept and sign it.