Performance* And Operation Mode Selection - Grundfos ALPHA series Installation And Operating Instructions Manual

9. Performance* and operation mode selection

*Hydraulic performance without check valve
Pos. Description
• Push-button for selection of pump setting
• Every time the push-button is pressed, the circulator setting is changed
High Fixed Speed
• Runs at a constant speed and consequently on a constant curve. In Speed III, the pump is
III
set on the maximum curve under all operating conditions. Quick Vent of the pump can be
obtained by setting the pump to Speed III for a short period.
Medium Fixed Speed
II
• Runs at a constant speed and consequently on a constant curve. In Speed II, the pump is
set on the medium curve under all operating conditions.
Low Fixed Speed
I
• Runs at a constant speed and consequently on a constant curve. In Speed I, the pump is set
on the minimum curve under all operating conditions.
Constant Pressure I
• The duty point of the pump will move left and right along the lowest constant-pressure curve
depending on water demand in the system. The pump head (pressure) is kept constant,
irrespective of the water demand.
Constant Pressure II
• The duty point of the pump will move left and right along the middle constant-pressure curve
depending on water demand in the system. The pump head (pressure) is kept constant,
irrespective of the water demand.
Constant Pressure III
• The duty point of the pump will move left and right along the highest constant-pressure
curve depending on water demand in the system. The pump head (pressure) is kept
constant, irrespective of the water demand.
AutoADAPT (Factory Setting)
• This function controls the pump performance automatically within the defined performance
range (shaded area). AutoADAPT will adjust the pump performance to system demands
over time.
AUTO
ADAPT
Operating range
(maximum - minimum)
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