Control description: 1. Variable frequency one control two+variable frequency sleeping small pump control, controlled by KDN304-14AR, with secondary wire diameter of 0.75 or 1.0mm. 2. When HK is set to automatic mode, the water pump will run automatically. According to the feedback signal, the speed of the water pump and the number of water pumps to be operated will be automatically adjusted. The pumps will rotate for 48 hours, and the dormant small pump will automatically enter and exit, so as to achieve the purpose of constant pressure water supply. 3. When HK is set to manual mode, press the corresponding switch to make the pump run at power frequency. 4. Float switch SL prevents the water pump from rotating when there is no water. There are 4 figures in this document.