Grundfos ALPHA1 High Efficiency ECM Variable Speed Circulator Pumps

Grundfos ALPHA1 High Efficiency ECM Variable Speed Circulator Pumps for Hydronic Heating, Cooling, and Building Automation Systems

Grundfos ALPHA1 High Efficiency ECM Variable Speed Circulator Pumps are electronically controlled wet-rotor circulators designed for hydronic heating, cooling, and HVAC applications requiring efficient circulation and external speed control. The ALPHA1 combines a permanent-magnet ECM motor with an integrated frequency converter, providing an energy-efficient alternative to conventional fixed-speed circulators.

The Grundfos ALPHA1 is designed for circulating liquids in larger heating and cooling circuits. Unlike internally controlled circulators that automatically select their own operating mode, the ALPHA1 is designed to receive a low-voltage 0-10 VDC control signal from an external system controller. This allows pump speed to be coordinated with compatible boilers, HVAC controllers, and building management systems.

The 0-10V input provides flexible variable-speed control based on system requirements. As the external control signal changes, pump speed can be adjusted to match changing heating or cooling demand. If the control signal is absent or fails, the ALPHA1 operates at maximum speed, helping maintain circulation.

Grundfos also equips the ALPHA1 26-99 with an alarm output signal for integration with compatible system controls. Its magnetite-resistant construction, ceramic shaft, stainless steel bearing plate, and high starting torque are designed to support dependable operation in hydronic systems where iron oxide, sediment, and other system contaminants can create challenges for circulator pumps.

The ALPHA1 uses a canned-rotor design in which the pump and motor form an integrated unit without a conventional shaft seal, and the bearings are lubricated by the pumped liquid. This compact construction, combined with ECM technology and external variable-speed control, makes the Grundfos ALPHA1 particularly useful for modern hydronic systems requiring direct pump control from boilers or building automation equipment.

Features

• High-efficiency ECM variable-speed circulator
• Permanent-magnet motor technology
• Integrated frequency converter
• 0-10 VDC analog input for external speed control
• Designed for integration with compatible boiler controls
• Suitable for building management system control
• Pump alarm output signal
• Variable-speed operation based on external control input
• Runs at maximum speed if the 0-10V control signal is absent or fails
• Canned-rotor circulator construction
• Pump and motor form an integrated unit without a conventional shaft seal
• Pumped liquid lubricates the bearings
• Magnetite-resistant design
• Robust ceramic shaft
• Stainless steel bearing plate
• High starting torque helps clear system debris and sediment
• Designed for efficient circulation in larger hydronic circuits
• Suitable for clean, thin, non-aggressive and non-explosive compatible liquids
• Suitable for compatible water/glycol mixtures within specified operating limits
• Designed for heating and air-conditioning systems
• Useful for new HVAC installations and upgrades from conventional circulators

Applications

• Hydronic heating systems
• Hydronic cooling systems
• Boiler circulation
• Air-conditioning systems
• Radiant heating systems
• Commercial hydronic systems
• Residential hydronic systems
• Large heating circuits
• Large cooling circuits
• Building automation systems
• Building management system controlled circulation
• 0-10V controlled hydronic systems
• Boiler-controlled circulation
• Variable-speed HVAC systems
• Water/glycol circulation
• Zoned heating and cooling systems
• ECM circulator upgrades
• Fixed-speed circulator replacement
• Energy-efficiency HVAC retrofit projects