GRUNDFOS Grundfos High-efficiency Circulator Pump ALPHA Solar 25-75 PN10 G1_1/2 130mm 1x230V – 98989299

High-efficiency circulator pump ALPHA SOLAR for use in solar thermal systems with variable or constant volume flow. High-efficiency pumps with electronically commutated motors (ECM), such as the ALPHA SOLAR, must not, however, be controlled by an external speed controller that changes or varies the supply voltage. The speed can be controlled via a pulse-width modulated signal (PWM signal) supplied by the solar system controller to optimize solar energy yield and system temperature. This also significantly reduces the pump's power consumption. If no PWM signal is available, the ALPHA SOLAR can be set to one of 4 constant speeds. The pump is then only switched on and off by the controller. Versions/Functions/Features: - High-efficiency EC permanent magnet motor technology - Energy Efficiency Index (EEI) <= 0.20 according to EN 16297-3: 2012 Best in Class - PWM profile C. The PWM signal is a method for generating an analog signal from a digital source - 4 constant speeds - Maintenance-free - Low noise - Easy installation - Deblocking screw - Max. ambient temperature +70 C