Grundfos ALPHA2 25-40 (180 mm) Circulation Pump with VFD, for 18,000–25,000 kcal/h Boilers, 4 m, 2.6 m³/h

Grundfos ALPHA2 25-40 Variable Frequency Drive (VFD) Circulation Pump

SKU	99411143
Manufacturer	Grundfos
Manufacturer Warranty	2 Years
Weight	3 Kg
Dimensions	142mm x 88mm x 180mm
Connection Type	Threaded - 11./2"
Pump Union Range	180 mm
Maximum Flow Rate	2.6 m³/h
Maximum Head	4 m
Material	Cast Iron
Impeller Material	PES

The Grundfos ALPHA2 25-40 series domestic heating circulator (with Auto-Adapt) is the most advanced energy-efficient domestic circulator of its kind. With both variable-speed pressure-controlled operation and standard selectable three-speed operation, it is the ideal choice for a wide variety of domestic hydronic heating systems.

The Grundfos ALPHA2 25-40 is an 'A'-rated / EuP Ready Energy-labeled product that delivers the highest possible energy savings under the energy labeling scheme.

The Grundfos ALPHA2 25-40 achieves reduced power consumption using the latest permanent magnet motor technology. Power consumption can be reduced to as low as 5 watts using pressure-controlled operation.

Grundfos ALPHA2 25-40 Features

• The AUTOADAPT function reduces energy consumption to the lowest possible level without compromising on comfort. It also enables faster and safer commissioning.
• Night setback mode for energy savings
• Manual Summer mode provides energy savings during summer and safe start-up during the heating season.
• Single-button simple operation makes it extremely easy to switch between control modes.
• No external protection is required, reducing installation time.
• High-torque start-up ensures better performance even in demanding conditions.
• Seal-free design and durable components eliminate maintenance needs.
• The Grundfos ALPHA2 25-40 plug enables fast and easy electrical cable connections.
• Insulation shells are supplied with the pumps to reduce heat loss in heating systems.
• Hydraulic balancing is fast and easy with the Grundfos GO Balance app and ALPHA Reader. With these technologies, you can guarantee hydraulic balancing without compromising reliability, efficiency, or ease of installation.
• When using the ALPHA2 temporary installation feature with the ALPHA Reader MI401 and the Grundfos GO Balance app, it is possible to balance radiators and/or underfloor heating systems quickly and conveniently.

The Grundfos ALPHA2 25-40 AUTOADAPT function continuously adapts pump performance to the actual heat demand. This means that system size and varying heat demand throughout the year are taken into account. The AUTOADAPT function finds the setting that provides the optimum comfort level with the lowest possible energy consumption. It also makes commissioning fast and easy.

The pump has three control modes, each with three settings:

• proportional pressure control
• constant pressure control
• constant curve mode

The Grundfos ALPHA2 25-40 display shows actual power consumption in watts or actual flow rate in m³/h. Alarms and warnings can also be monitored on the display. LEDs indicate the actual operating status.

When night setback is activated, the motor speed is automatically reduced for energy savings as the system temperature drops. Alternating operation between pumps depends on the temperature change in the flow pipe.

If the Grundfos ALPHA2 25-40 manual summer mode is activated, it prevents rotor blockage by frequently starting the pump at low speed, saving energy.

The seal-free rotor design means the pump and motor form a single unit. The bearings are lubricated by the transferred fluid and require no maintenance. The pump features dry-run protection. The pump uses a ceramic shaft, radial bearings, carbon bearing, stainless steel sleeve, bearing plate, rotor can, and composite impeller. These components provide a longer service life.

The Grundfos ALPHA2 25-40 has an automatic air-venting function, making commissioning easier. The compact design with an integrated control box and control panel on the pump head allows straightforward installation in the most common configurations.

The Grundfos ALPHA2 25-40 pump casing is made of cast iron and has been electro-chemically coated to enhance corrosion resistance.

The motor is a synchronous permanent magnet / compact stator motor known for its high efficiency ratings. Pump speed is managed by an integrated variable frequency drive (VFD) fitted in the terminal box.