Central air-conditioning system is usually divided into two chilled water and cooling water systems, chilled water system is divided into cooling mode and heating mode, these two models are controlled by a frequency converter, the following give you details: [1] cooling mode loop control system chilled water pumps in the program to ensure that the case of the terminal equipment supplied chilled water flow, to determine the minimum operating frequency of a frozen pump drive to work, set it to lower 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. [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. Cooling mode control scheme with central air conditioning as Xi'an Which is better, to ensure end-device flow of chilled water supply situation Xi'an central air-conditioning manufacturer, to determine the minimum operating frequency of a frozen pump drive to work, set it to lower frequency and Xi'an central locking air conditioner production, variable frequency chilled water pump frequency is regulated by the temperature sensor detects the temperature of the chilled water return chilled water system installed on backwater in charge, and then set temperature via a temperature controller to control the frequency of the inverter decrease . We buy air conditioning, in the end how to choose the size of the room is the most suitable for us? We exclude the special high-level and multi-tone glass doors outside Xi'an central air conditioning, under normal circumstances, the following data is to be calculated. 1.1P heating hang refrigeration area of ??12-17 square meters, heating area of ??10-11 square meters; 2 large 1P heating cooling hook 12-21 square meters area, heating area of ??13-18 square meters; 3.1.5P heating hang refrigeration area of ??16-28 sq m, heating an area of ??17-23 sq m; 4.2P heating Guiji cooling area of ??23-30 sq m, heating an area of ??20-22 sq m; 5.2 .5P heating Guiji cooling area of ??28-35 sq m, heating an area of ??24-28 sq m; 6.3P heating Guiji cooling area of ??33-42 square meters, heating area of ??27-30 square meters. Xi'an Central Xi'an central air conditioning manufacturers _ _ Xi'an Hao Electrical and Mechanical Services provided by the Xi'an Hao Electrical and Mechanical Technology Limited. Xi'an Hao Electrical and Mechanical Technology Co., Ltd. (www.029hfkt.com/)(www.029hfkt.com) strong, credible, in Xi'an in central air-conditioning industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the Electrical and Mechanical Xi'an Hao into the brilliant and you work for a better future!