Product Introduction; Product Description; Application; Advantages Of Installing A Grundfos Alpha2 L - Grundfos ALPHA2 L Series Installation And Operating Instructions Manual

6. Product introduction

6.1 Product description

Max. 95 % RH
IP42
Min./Max.
+2 °C / +110 °C
Min./Max.
0 °C / +40 °C
< 43 dB(A)
Pumped liquids and operating conditions
Fig. 7

6.2 Application

The GRUNDFOS ALPHA2 L circulator pump is designed for the
circulation of water in heating systems.
The pump is suitable for the following systems:
• underfloor heating systems
• one-pipe systems
• two-pipe systems.
The pump incorporates a permanent-magnet motor and
differential-pressure control enabling continuous adjustment of
the pump performance to the actual system requirements.
The pump has a user-friendly front-mounted operating panel. See
sections and
7. Identification 9. Operating

6.3 Advantages of installing a GRUNDFOS ALPHA2 L

The installation of a GRUNDFOS ALPHA2 L means
Easy installation and startup
• The pump is easy to install.
With the factory setting, the pump can, in most cases, be
started without making any settings.
High degree of comfort
• Minimum noise from valves, etc.
Low energy consumption
• Low energy consumption compared to conventional circulator
pumps.
Energy efficiency index (EEI)
• The Ecodesign directive for energy-using (EuP) and energy-
related (ErP) products is EU legislation requiring
manufacturers to reduce the overall environmental impact of
their products.
• The pumps are energy-optimised and comply with the
regulations of the EuP directive.

6.4 Intended use

GRUNDFOS ALPHA2 L is suitable for
• systems with constant or variable flows where it is desirable to
optimise the setting of the pump duty point.
• systems with variable flow-pipe temperature.
8

6.5 Pumped liquids

panel.
Clean, thin, non-aggressive and non-explosive liquids, not
containing solid particles, fibres or mineral oil. See fig. 7.
In heating systems, the water must meet the requirements of
accepted standards on water quality in heating systems, for
example the German standard VDI 2035.

6.6 System pressure

Maximum 1.0 MPa (10 bar). See fig. 7.

6.7 Relative air humidity (RH)

Maximum 95 %. See fig. 7.

6.8 Enclosure class

IP42. See fig. 7.

6.9 Inlet pressure

Minimum inlet pressure in relation to liquid temperature. See fig.
7.
Max. 1.0 MPa
(10 bar)
p H
[kPa] [m]
60
6
40
4
20
2
0 0
0.0 0.4 0.8
0.0 0.2
Min. Min.
0.005 MPa 0.028 MPa
0.05 bar 0.28 bar
75 °C 90 °C
CAUTION
Flammable material
Minor or moderate personal injury.
- Do not use the pump for flammable liquids, such
as diesel oil and petrol.
CAUTION
Corrosive substance
Minor or moderate personal injury.
- Do not use the pump for aggressive liquids, such
as acids and seawater.
Minimum inlet pressure
Liquid
temperature
[MPa]
≤ 75 °C
0.005
90 °C 0.028
110 °C 0.108
1.2 1.6 2.0 2.4 Q [m³/h]
0.4 0.6
Q [l/s]
Min.
0.108 MPa
1.08 bar
110 °C
[bar]
0.05
0.28
1.08