Control Functions; Elements On The Control Panel; Control Panel; Pump Settings - Grundfos ALPHA1 L Instrucciones De Instalación Y Funcionamiento

6.4.2 Type key
Example
Pump type
Nominal diameter (DN) of inlet and outlet
ports [mm]
Maximum head [dm]
[ ]: Cast-iron pump housing
A: Pump housing with air separator
N: Stainless-steel pump housing
Port-to-port length [mm]

7. Control functions

7.1 Elements on the control panel

Fig. 10 Control panel
Symbol Description
Push-button
I, II, III Constant-speed curve I, II and III
Radiator heating mode (proportional pressure)
Underfloor heating mode (constant pressure)
ALPHA1 L 25 -40 180

7.2 Control panel

The control panel shows the following:
• the settings, after pressing the button
• operating status
• alarm status.
7.2.1 Operating status
During operation, the control panel shows the actual operating
status or the alarm status. See section
7.2.2 Alarm status
If the pump has detected one or more alarms, the first LED
switches from green to red. When the fault has been resolved the
control panel switches back to operating status.
See section 9. Fault finding the

7.3 Pump settings

The pump has seven different control modes. The pump can be
set to the following:
Setting Description
I Constant curve or constant speed I
II Constant curve or constant speed II
III Constant curve or constant speed III
Factory setting:
Radiator heating mode
Underfloor heating control mode
Fixed proportional curve
3 s.
Externally controlled:
PWM profile A
Fig. 11 Pump setting table
To learn more about each control mode, see section
modes.
7.2.2 Alarm status.
product.
7.4 Control
11