Cling CEZDD Series CO₂ Bus Air Conditioning,Environmentally Friendly&High Efficiency, suitable for 8-13m buses. Features: 1.The fully enclosed carbon dioxide compressor meets the stringent requirements of the automotive field; 2.The heat pump air conditioning system uses electronic expansion valves to achieve optimal high pressure control and ensure reliable system operation; 3.Double safety protection of compressor suction and discharge pressure and temperature is adopted to ensure the safe operation of the system; 4.A new control method is adopted, combined with optimized control logic such as compressor, pressure switch and overall system performance, to ensure efficient operation of the system; 5.Continue to use Cling's existing large-scale double return air platform structure, which is unified and beautiful, and has wide versatility; 6.The automatic control system can achieve optimal control with the change of ambient temperature and is easy to operate; 7.With remote monitoring function, real-time monitoring of product operation status, assisting customers in operation management and control, effectively reducing management costs.