English (GB)
7
4.3 Venting the pump
Fig. 7
Venting the pump
Small air pockets trapped inside the pump may cause noise when
starting up the pump. However, because the pump is self-venting
through the system, the noise ceases over a period of time.
To speed up the venting process, do as follows:
1. Set the pump to speed III using the button on the operating
panel.
2. Let the pump run for minimum 30 minutes. How fast the pump
is vented depends on the system size and design.
When you have vented the pump, that is when the noise has
ceased, set the pump according to the recommendations. See
section
.
5. Product introduction
5.1 Product description
ALPHA1 L can be used as stand-alone or integrated circulator
pump in existing systems as replacement or in new systems with
either variable or constant flow rate.
The speed can be controlled by a low-voltage PWM (Pulse Width
Modulation) signal.
High-efficiency ECM (Electronically Commutated Motor) pumps,
such as ALPHA1 L, must not be speed-controlled by an external
speed controller varying or pulsing the supply voltage.
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
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
for further information.
TM
07
015
3
091
8
The pump must not run dry.
The pump is from factory set to radiator heating
mode.
Minimum 30 min
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.
