This paper analyzes the working principle of the new air handling units: the electric control valve and fan chain to guarantee the power supply when the cut off valve also has a closed fan. Electric control valve can also be completed and fan interaction, electric control valve closed when the fan cut off the power supply. The new air unit temperature control system consists of a proportional-integral temperature controller, device inside air temperature sensor and electric tube conditioning valve. Moderation effect is to put air duct temperature sensor detected air temperature and transferred to a thermostat temperature control settings match, and based on the consequences of the combined operation of the air conditioning unit PI thermostat to the electric control valve is an on / off valve signal, and then the supply air temperature limitations persist in the demand. Maintenance: 1. Before starting the fan horizontal air conditioning units, should be cleared of debris in ducts, pipes and check valve device is normal. 2. Turned cold (hot) source and then start the fan air conditioning units, adjust the desired amount of wind. 3. Require clean water, soft water is best. 4. In unit deactivated season, should be filled with water to make the principle of modular air conditioning units in the heat exchanger to reduce the pipe corrosion. But not in use during the winter, in order to prevent the cracking tube must be put clean water unit memory. Air purification air conditioning units, Chen Yu-conditioned factory outlets (certified), Chittagong air conditioning units provided by Wu Cheng Chen-yu air-conditioning Limited. Wu Cheng Chen Yu Air Conditioning Equipment Co., Ltd. (www.wccykt.com) is a leader in Dezhou, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Chen Yu-conditioning in leadership with the staff warmly welcome all inquiries negotiations to create Chenyu conditioning a better future.