Variable-Speed Circulator Is Built on Magnet Motor Technology Platform

Variable-speed ALPHA1 circulator pumps can replace single-speed and 3-speed circulators in its class.

Grundfos is expanding its line of ALPHA circulator pumps with the variable-speed ALPHA1, which has a duty range that can replace single-speed and 3-speed circulators in its class.

ALPHA1 offers three constant-pressure modes. The LED display ensures the ALPHA1 is delivering the optimal hydronic heating and/or hot-water recirculation flow rate at the lowest possible energy consumption.

Because this permanent magnet motor (ECM) circulator can replace standard three-speed and single-speed circulator models, distributors will be able to reduce the variety of models stocked on their shelves and contractors will be able to reduce the number of pumps on their truck. All components of the ALPHA1 are produced and assembled by Grundfos in Fresno, Calif.

Versatile Operation: The three constant pressure control modes of the ALPHA1 are operated with a single push-button control. ALPHA1 is available in both cast iron and stainless steel models, as well as standard and rotated flange pump housing configurations. Furthermore, ALPHA1 is also available in either line-cord or terminal box electrical connections.

Tested Technology: At the core of ALPHA1 is an ECM motor featuring a magnetized rotor to avoid motor-slippage problems common to induction-type motors. The result is an efficient motor that generates less heat and energy waste, while delivering a starting torque four times higher than a standard induction motor. In the case of a blocked rotor, its constant restart feature attempts to restart indefinitely every seven seconds.

Compact design: The electronics of the ALPHA1 are fully integrated within the motor, which simplifies installation in tight spaces. The LED real-time display shows a flow indicator in gallons per minute and energy consumption in watts.
ALPHA1 offers a flow range of 0 to 19 GPM (0 to 72 Liters per minute) and a head range from 0 to 19 feet (0 to 5.8 meters). It can handle fluid temperatures from 36 to 230 F (2.2 to 110 C) with a maximum working pressure of 150 pounds per square inch (psi).

Other standard features:

Magnetite Resistance: To prolong pump operation life, the ALPHA series has a magnetite-resistant design with a stainless-steel bearing plate, robust ceramic shaft and ceramic bearing rings, which also provides for air venting. Magnetite, or iron-oxide sludge, would normally hamper circulator operation as metal components oxidize inside hydronic systems and these metal rust particles can lead to breakdowns.
Backflow prevention: An integrated check valve prevents backflow from occurring.
Quiet operation: The ALPHA1 uses ECM, permanent magnet motor technology and a hydraulic design, allowing ALPHA1 to operate at 19.2 dB(A) at full speed.
Plug-and-play convenience: Installers have the flexibility to use either a line cord or terminal box for conduit connections.
Multiple Configurations: ALPHA1 comes in both cast iron and stainless steel models, as well as standard and rotated flange pump housing configurations.
Installer-friendly pipe connections: Its volute has a standard two-bolt flange with a built-in, nut-capture feature that holds the bolt steady during tightening. Spared from having to use a second wrench to keep the bolt from slipping or turning, the installer has a free hand to hold the circulator in place.