4. Starting up the product
4.1 Before startup
Do not start the pump until the system has been filled with liquid
and vented. Make sure that the required minimum inlet pressure is
available at the pump inlet. See section Technical data. When using
the pump for the first time, the system must be vented. See section
Venting the pump. The pump is self-venting through the system.
Related information
4.2 Starting up the pump
Step Action
Illustration
1
Open the inlet and
outlet valves.
TM068554
2
Switch on the power
supply.
0/Off
1/On
TM068555
3
The lights in the op-
erating panel indi-
cate that the power
supply has been
switched on and the
pump is running.
TM068556
4.3 Venting the pump
M
TM070153
Venting the pump
Pos.
Description
M
Minimum 30 min
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 Control modes.
The pump must not run dry.
The pump is from factory set to radiator heating mode.
Related information
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 pump automatically controls the differential pressure by
adjusting the pump performance to the actual heating demand
without the use of external components, thus avoiding:
•
too high energy consumption
•
irregular control of the system
•
noise in thermostatic valves and similar fittings.
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.
10
English (GB)