Fresh air unit new air unit control includes: control of air temperature, air humidity control, frost control, CO2 concentration control, and various interlock content. If the new commitment to consider indoor air unit loads (eg DC-type units), but also to control the room temperature (or indoor relative humidity). A new air unit temperature control system is by proportional integral temperature controller installed in the supply air duct temperature sensor and electric control valve. The controller's role is to put air duct temperature sensor detected air temperature is transmitted to the thermostat set temperature controller compares PI calculation based on the results, adjust the thermostat to the electric valve is an on / off signal valve, so that the supply air temperature is maintained at the desired range. 2 electric control valve and fan chain to ensure that when the power cut off valve also closes and the fan. Electric control valve can achieve linkage with the fan (as shown in the dashed box), cut the power off when the fan electric control valve. The figure above two kinds of chain line connections, one for power and electrical equipment off and reset the device, the user can choose according to their own specific circumstances. (Antifreeze is a requirement by the travel stop to keep the hot water valve opening degree required). 3 When cooling is required, the thermostat placed in the cooling mode when the temperature sensor is at or below the set temperature, the thermostat to the electric valve of a signal unit off valve, close the valve contacts the valve closed electric valve ON . If the measured temperature does not reach the set temperature, the thermostat to the electric valve a valve opening signal, the electric valve open contact to put the valve open. Heating when required, the thermostat is placed in heating mode, when the temperature sensor measures the temperature at or above the set ceiling-mounted unit, a thermostat for electric valve shut valve signal, the electric valve off valve connected contacts through the valve closes. If the measured temperature does not reach the set temperature, the thermostat to the electric valve a valve opening signal, the electric valve open contact to put the valve open. 4 When the filter is clogged or when it exceeds a predetermined value, the pressure switch switching signal is given. 5 When the coil temperature is too low, low antifreeze switch gives the switch signal modular unit, fan stops to prevent the cracking coil. Details of the air handling units: modular air conditioning units Dingrui specializing in the production of air-conditioning use modular frame design, the unit of length and width increase proportionally according to the modulus, but also can set the length according to the actual situation, the width flexible adjustment. modular design makes the unit very easy to assemble, and to be based on actual needs and a half modular design modular air conditioning units using plate truss assembly structure, streamline appearance beautiful, high structural strength, low noise, sealing Excellent performance combined air-conditioning unit also uses a high-pressure polyurethane foam insulation composite panels, has a very low thermal conductivity, heat resistance is far below the national standard value, high water resistance, flame retardant. Units supporting heat exchanger (table air-conditioning, heater) heat transfer through the professional design software selection. At the same time the United States with the introduction of advanced heat exchanger production line, good heat transfer effect, beautiful appearance. Modular air conditioning units, air conditioning Dingrui (online consultation), the unit is provided by wucheng Dingrui Air Conditioning Equipment Co., Ltd .. Wucheng Dingrui Air Conditioning Equipment Co., Ltd. (www.wcdrkt.com) (www.wcdrkt.com) is an industry leader in Shandong Dezhou, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness , the maximum meet customer needs. In Dingrui air conditioning leadership with the staff warmly welcome all inquiries negotiations to create Dingrui air conditioning better future.