Central air-conditioning system is usually divided into two chilled water and cooling water systems Xi'an central air-conditioning manufacturers, chilled water system is divided into cooling mode and heating mode, the two modes are controlled by a frequency converter, the following give you details : [1] cooling mode chilled water pumps closed-loop control system of the program in the case of the terminal equipment to ensure flow of chilled water supply, establish a minimum operating frequency pump inverter refrigeration work, set it to lower frequency and locked, frequency chilled water pump frequency adjustment is installed on the chilled water system supervisor backwater Chilled water temperature sensor detects the return water temperature Xi'an central air conditioning, and then through the temperature controller set temperature to increase or decrease the frequency inverter control. [2] heating mode chilled water pump system, closed-loop control of the mode control scheme is in the central air conditioning heat pump operation (ie heating) when chilled water pump system. As with the cooling mode control scheme, Xi'an central air conditioning production in ensuring end-device flow of chilled water supply, it is determined a frozen pump drive work the minimum operating frequency, which is set at the lower limit frequency and locked, frequency chilled water pump frequency adjustment is installed on the chilled water system backwater competent chilled water temperature sensor detects the return water temperature, and then through the temperature controller set temperature to control the frequency inverter decrease. Home central air-conditioning can be used all year round Xi'an central air conditioning installation and summer cooling, excess of heat, winter heating (need to increase the auxiliary heating device), but also the introduction of natural wind, to make your home year-round spring. Xi'an central air conditioning production, Xi'an Hao Electrical and Mechanical Services (certification), Xi'an Xi'an Hao central air conditioning is provided by the Electrical and Mechanical Technology Limited. Xi'an Hao Electrical and Mechanical Technology Co., Ltd. (www.029hfkt.com/)(www.029hfkt.com) is Xi'an, central air conditioning leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum to meet customer needs. Xi'an Hao Electrical and Mechanical Services leadership with the staff warmly welcome all inquiries negotiations to create the Electrical and Mechanical Xi'an Hao better future.