Grundfos ALPHA1 L Serie Instrucciones De Instalación Y Funcionamiento página 15

6. Control functions
6.1 Operating panel
Operating panel
Symbol Description
Button
I, II, III Constant curve or constant speed curve I, II and III
Radiator heating mode (proportional pressure)
Underfloor heating mode (constant pressure)
The operating panel shows the following:
• The control mode, after pressing the button
• Alarm status.
6.1.1 Alarm or warning
If the pump has detected one or more alarms or warnings, the first
LED switches from green to red. When the fault has been resolved
the operating panel switches back to operating status.
See section Fault finding the product.
Related information
9. Fault finding the product
6.2 Control modes
The pump has seven different control modes. Learn more about
them in the following sections.
6.2.1 Radiator heating mode (factory setting)
The radiator heating mode adjusts the pumps performance to the
actual heat demand in the system following a proportional-pressure
curve.
H
Proportional-pressure curve
Recommended
System type
control mode
Two-pipe sys- Radiator heating
tem mode
Related information
6.2.3 Constant curve or constant speed, I, II or III
6.2.2 Underfloor heating mode
The underfloor heating mode adjusts the pump performance to the
actual heat demand in the system following a constant-pressure
curve.
H
Constant-pressure curve
Recommended
System type
control mode
Underfloor heating sys- Underfloor heating
tem
Q
Alternative control mode
Constant curve or constant
speed, I, II or III. See section
Constant curve or constant
speed, I, II or III.
Q
Alternative con-
trol mode
No alternatives
mode
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