2. Product introduction
2.1 Product description
The ALPHA SOLAR is designed to be integrated in all kinds of
thermal solar systems with either variable or constant flow rate.
High-efficiency ECM (Electronically Commutated Motor) pumps,
such as ALPHA SOLAR, must not be speed-controlled by an
external speed controller varying or pulsing the supply voltage. The
speed can be controlled by a low-voltage PWM (Pulse Width
Modulation) signal from a solar controller to optimise the solar
harvesting and temperature of the system. As a result, the power
consumption of the pump will be reduced considerably.
If no PWM signal is available, you can set ALPHA SOLAR to
operate at constant curve, only switched on and off by the
controller.
2.2 Pumped liquids
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 product is suitable for the following:
•
Clean, thin, non-aggressive and non-explosive liquids, not
containing solid particles or fibres.
•
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.
•
The pH must be between 8.2 and 9.5. The minimum value
depends on the water hardness and must not be below 7.4 at 4
°dH (0.712 mmol/l).
•
The electrical conductivity at 25 °C must be ≥ 10 microS/cm.
•
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.
•
Solar media as used in typical solar thermal systems
containing up to 50 vol. % of antifreeze media.
In domestic hot-water systems, the pump must be used only for
water with a degree of temporary hardness of less than 3 mmol/l
CaCO3 (16.8 °dH). To avoid lime problems in hard water, the liquid
temperature must not exceed 65 °C.
Related information
6
English (GB)
