The Variable Voltage version of the Variable Speed 00™ Circulator is designed to operate the pump at different speeds based on an externally-generated analog voltage signal input. Its reliable operation, ease of installation and integration to DDC or building management systems allows for a wide variety of HVAC applications, such as maintaining a pressure differential or a setpoint temperature. The control accepts a 0-10 V(dc), 0-20 mA, 2-10 V(dc), or 4-20mA signal. Features 4 Signal Voltage Ranges (0-10 V(dc), 0-20 mA, 2-10V(dc), or 4-20 mA) Internal LED’s Manual Operation Switch Linear or Logarithmic Output Pump Exercise (10 Seconds After 3 Days of No Operation)Website Brochures_Info\Taco 00 Series.pdf