Control Functions; Elements On The Control Panel; Display; Setting The Pump - Grundfos ALPHA1 Instrucciones De Instalación Y Operación

8. Control functions

8.1 Elements on the control panel

2
PC XXXX
3
4
Fig. 7 Control panel
Pos. Description
Display showing the power
consumption in watt or the flow
1
Light field indicating high and low flow
Production code:
2 • 1st and 2nd figures: year
• 3rd and 4th figures: week
Light field indicating constant pressure
3
setting
Push-button for selection of pump
4
setting

8.2 Display

The display (1) 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, correct the fault and reset
the pump 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 alternately flashes between "0" and
"1" randomly.
• The light field shows HI for high flow
– If the flow is higher than 12 gpm, the light
field shows "HI" on user interface.
12
8.2.1 Light fields indicating the pump setting
The pump has optional performance settings
which you can select with the push-button. See
fig. 7.
The pump setting is indicated by light fields in
the display. See fig. 8.
1
Fig. 8
For more information about the function of the
settings, see section

8.3 Setting the pump

You can change the pump setting by pressing
the push-button.
8.3.1 Factory default setting
The pump's factory default setting is the
Constant Pressure III setting.
8.3.2 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.

8.4 Pump control

See section
operating mode
Constant-pressure control
In this control mode, a constant differential
pressure across the pump is maintained,
irrespective of the flow.
See also sections
8.3 Setting the
Light fields
9. Fault finding the
8.5 Pump performance and
selection.
8. Control functions
pump.
product.
and