Delta's industrial automation products save energy when used in air-conditioning systems. In the circuit of a chilled water unit, the chilled water pump and cooling water pump use the most horsepower in the entire system and have the most potential for energy-saving efficiency. These devices are the first for consideration when saving energy. The temperature measurement module designed for Deltaˇ¦s programmable logic controller can detect the current air-conditioning load from the water outlet and water return pipe. With the load known, the analog output function then controls Deltaˇ¦s AC motor drive to further control the frequency of the motor, which regulates the flow and saves energy.