Control system for adding chemicals into cooling water of central air conditioner for operation and maintenance and control method of control system

The invention relates to a control system for adding chemicals into cooling water of a central air conditioner for operation and maintenance and a control method of the control system. The control system comprises a main controller, a water quality detection device, a blowdown device, a chemical adding device and a cloud platform. The blowdown device is provided with a plurality of driving devices and a plurality of automatic blowdown valves. The chemical adding device comprises a plurality of chemical adding metering pumps, a plurality of chemical adding buckets, a plurality of liquid level testing electrodes and a plurality of liquid level sensors. The cloud platform is provided with a communication module, a wireless router and the like. When the control system is applied, operation steps are simple and reliable, and observation is convenient; various functions such as online detection of the water quality, automatic operation of chemical adding after blowdown, automatic recording and statistics of chemica