In October 2007, the energy-saving transformation of the central air-conditioning water-source heat pump system of the China Telecom Communication Complex in Shaoxing was built, and the SXG-PT45 central air-conditioning distributed control system was newly built. control. At the same time, it monitors more than 400 air-conditioning terminals in the entire building, and can log in through the remote network. The intelligence of the entire system is improved, and the energy-saving effect is quite obvious.