5.1.1 Model type
These installation and operating instructions cover ALPHA1 L. The
model type is stated on the packaging and nameplate.
5.2 Applications
The pump is designed for circulating liquids in heating systems. The
pumps are suitable for the following systems:
•
Systems with constant or variable flows where it is desirable to
optimise the pump duty point.
•
Installation in existing systems where the differential pressure of
the pump is too high during periods of reduced flow demand.
•
Installation in new systems for automatic adjustment of the
performance to flow demands without the use of bypass valves
or similar expensive components.
5.3 Pumped liquids
In domestic hot-water systems, we recommend that you
keep the liquid temperature below 65 °C to eliminate the
risk of lime precipitation.
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.
The pump is suitable for clean, thin, non-aggressive and non-
explosive liquids, not containing solid particles, fibres or mineral oil.
In heating systems, the water must meet the requirements of
accepted standards on water quality in heating systems, for
example the German guideline VDI 2035.
Mixtures of water with antifreeze media such as glycol with a
kinematic viscosity lower than 10 mm
2
/s (10 cSt). When selecting a
pump, the viscosity of the pumped liquid must be taken into
consideration. If the pump is used for a liquid with a higher viscosity,
the hydraulic performance of the pump is reduced. See section
Technical data for further information.
Related information
11
English (GB)
