Brochure

Control modes
5.2.1 Control modes, ALPHA2
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2
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TM043421
Elements on the ALPHA2 user interface
Pos. Description
1
Display showing the power consumption in watt or the
flow
Light field indicating high and low flow
2
Production code:
- 1st and 2nd figures, year
- 3rd and 4th figures, week
3 Light field indicating fixed speed setting
4 Light field indicating constant pressure setting
5 Light field indicating AUTOAdapt setting
6 Push-button for selection of pump setting
Display
The display is on when you have switched on the power
supply. The display shows the actual pump power
consumption in watt (integer) or the actual flow during
operation. If a fault is indicated after the fault is corrected,
the pump is reset by switching the power supply off and on.
If the pump impeller is rotated, for example, when filling the
pump with water, sufficient energy can be generated to light
up the display even if the power supply has been switched
off.
Light field indicating high and low flow:
• The light field blinks for low flow. If the flow is lower than
1 gpm, the light field flashes randomly between "0" and
"1".
• The light field shows "HI" for high flow. If the flow is
higher than 12 gpm, the light field shows "HI" on the user
interface.
Light fields indicating the pump setting:
• The pump has optional control modes with different
settings which are selected with the push-button. The
pump setting is indicated by light fields in the display.
Setting the pump
AUTOAdapt, factory default setting - The pump's factory
default setting is the AUTOAdapt setting. The setting can be
changed from the recommended factory default setting to an
alternative setting by pressing the pump's push-button.
Changing from recommended to alternative pump
setting - Heating systems are "slow" systems that cannot
be set to the optimum operation within minutes or hours.
However, if the recommended pump setting in some
applications does not give the desired distribution of heat in
the rooms of the house, you can change to an alternative
pump setting.
Selection of control mode by application
Application ALPHA2 control mode
Floor heating Constant pressure
Two-pipe system AUTOAdapt
Ventilation Speed 1, 2 or 3
Boiler shunt Speed 1, 2 or 3
One-pipe system Speed 1, 2 or 3 or constant pressure
Domestic hot water Speed 1, 2 or 3
ALPHA2 AUTOAdapt mode
The AUTOAdapt mode adjusts the pump performance to the
actual heat demand in the system. As the performance is
adjusted gradually, we recommend that you leave the pump
in the AUTOAdapt mode for at least one week before
changing the pump setting. If you choose to change back to
AUTOAdapt, the pump remembers its last setpoint in
AUTOAdapt and resumes the automatic adjustment of the
performance.
ALPHA2 constant pressure modes
In this control mode, the constant differential pressure
across the pump is maintained, irrespective of the flow.
ALPHA2 constant speed modes (III, II, or I)
In this control mode, the pump runs at a constant speed and
consequently on a constant curve.
• At speed III, the pump is set on the maximum curve
under all operating conditions. You can quickly vent the
pump by setting the pump to speed III for a short period.
• At speed II, the pump is set on the medium curve under
all operating conditions.
• At speed I, the pump is set on the minimum curve under
all operating conditions.
ALPHA2 manual summer mode
In this control mode, the pump is stopped to save energy,
and only the electronics are running. To avoid lime deposit
that could block the pump, the pump is started every 25
hours for two minutes at a low speed. This is an alternative
to shutting down the pump if there is a risk of lime deposit.
The display is turned off. If any faults occur during manual
summer mode, the display will show the faults when the
pump is taken out of manual summer mode.
If any alarms occur during manual summer mode, no alarms
will be shown. When manual summer mode is deactivated
again, only the actual alarms will be displayed.
ALPHA
5
21
Operation