> The principle of construction and renovation is: It does not affect the normal cooling operation of the project.

> The first stage: BIM 3D drawing, positioning of pipelines and equipment, accurate design drawings. Production line modular in the factory, fine welding and corresponding accessories.

> The second stage: Main equipment, prefabricated pipes and valves are transported to the project site.

> The third stage: when the air conditioning system is running under partial load conditions, close the manual valves before and after the chiller and water pump that are not started, remove the chiller and water pump, and replace them with new chiller and water pump; Replace the chiller and water pump one by one without affecting the normal cooling demand.

> The fourth stage: automatic control system debugging, joint operation debugging, energy efficiency debugging, to ensure that the system meets the operation and efficiency cost requirements.

> The fifth stage: Third-party energy efficiency acceptance, The precision energy efficiency measurement system is certified by the third party authority;(The third party certification body must have CMA, CNAS qualification)