English (GB)
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The table below shows the ALPHA2 and APLHA3 models with built-in functions and features.
* Production code (Year-Week).
** Not available in all countries.
6.2 Applications
The ALPHA2 and ALPHA3 circulator pumps are designed for the
circulation of water in heating systems, domestic hot-water
systems as well as air-conditioning and cold-water systems.
Cold-water systems are defined as systems where the ambient
temperature is higher than the temperature of the pumped liquid.
ALPHA2 and ALPHA3 are the best choices for the following
systems:
• underfloor heating systems
• one-pipe systems
• two-pipe systems.
ALPHA2 and ALPHA3 are suitable for the following:
• Systems with constant or variable flow rates where you want
to optimise the setting of the pump duty point.
• Systems with variable flow-pipe temperature.
• Systems where you want automatic night setback.
• Balancing of domestic heating systems.
6.3 Pumped liquids
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 pump is suitable for the following liquids:
• Thin, clean, non-aggressive and non-explosive liquids, not
containing solid particles or fibres.
• Cooling liquids, not containing mineral oil.
• Domestic hot water
Maximum: 14 °dH
Maximum: 65 °C
Maximum peak: 70 °C.
For water with a higher degree of hardness, we recommend
that you use a direct-coupled TPE pump.
• Softened water.
The kinematic viscosity of water is 1 mm
2
/s (1 cSt) at 20 °C. If the
pump is used for a liquid with a higher viscosity, the hydraulic
performance of the pump will be reduced.
Example: 50 % glycol at 20 °C means a viscosity of approx. 10
mm
2
/s (10 cSt) and a reduction of the pump performance by
approx. 15 %.
Do not use additives that can or will disturb the functionality of the
pump.
When selecting a pump, take the viscosity of the pumped liquid
into consideration.
For more information about the pumped liquids, warnings and
operating conditions, see fig. 15.
Functions/features ALPHA2 model B ALPHA2 model C ALPHA2 model D ALPHA2 model E ALPHA3 model A
Starts from PC 12xx* PC 14xx* PC 15xx* PC 17xx* PC 15xx*
AUTO
ADAPT
●●●●●
Proportional pressure ●●●●●
Constant pressure ●●●●●
Constant curve ●●●●●
Automatic night setback ●●●●●
Manual summer mode ●●●●
Dry-running protection ●●●
ALPHA Reader compatible ●●
High-torque start ●●●
ALPHA2/3XX-40 ●●●●●
ALPHA2/3XX-50** ●●●●●
ALPHA2/3XX-60 ●●●●●
ALPHA2/3XX-80 ●●●●
CAUTION
Flammable material
Minor or moderate personal injury.
- Do not use the pump for flammable liquids, such
as diesel oil and petrol.
WARNING
Biological hazard
Death or serious personal injury.
- In domestic hot-water systems, the temperature of
the pumped liquid must always be above 50 °C
due to the risk of legionella.
WARNING
Biological hazard
Death or serious personal injury.
- In domestic hot-water systems, the pump is
permanently connected to the mains water.
Therefore, do not connect the pump by a hose.
CAUTION
Corrosive substance
Minor or moderate personal injury.
- Do not use the pump for aggressive liquids, such
as acids and seawater.
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