Pump Settings And Pump Performance - Grundfos ALPHA1 Series Installation And Operating Instructions Manual

11. Pump settings and pump performance

Figure 14 shows the relation between pump setting and pump performance by means of curves. See also section 14. Performance
curves.
H
Fig. 14 Pump setting in relation to pump performance
Setting Pump curve
Lowest proportional-
PP1
pressure curve
PP2 Highest proportional-
(factory setting) pressure curve
Lowest constant-
CP1
pressure curve
Highest constant-
CP2
pressure curve
III Speed III
II Speed II
I Speed I
POWER
AUTO ON
PP1 CP1
PP2
I
Function
The duty point of the pump will move up or down on the lowest proportional-pressure
curve, depending on the heat demand in the system. See fig. 14.
The head (pressure) is reduced at falling heat demand and increased at rising heat
demand.
The duty point of the pump will move up or down on the highest proportional-pressure
curve, depending on the heat demand in the system. See fig. 14.
The head (pressure) is reduced at falling heat demand and increased at rising heat
demand.
The duty point of the pump will move out or in on the lowest constant-pressure curve,
depending on the heat demand in the system. See fig. 14.
The head (pressure) is kept constant, irrespective of the heat demand.
The duty point of the pump will move out or in on the highest constant-pressure curve,
depending on the heat demand in the system. See fig. 14.
The head (pressure) is kept constant, irrespective of the heat demand.
The pump runs at a constant speed and consequently on a constant curve.
In speed III, the pump is set to run on the maximum curve under all operating conditions.
See fig. 14.
Quick venting of the pump can be obtained by setting the pump to speed III for a short
period. See section 10.2 Venting the pump.
The pump runs at a constant speed and consequently on a constant curve.
In speed II, the pump is set to run on the intermediate curve under all operating
conditions. See fig. 14.
The pump runs at a constant speed and consequently on a constant curve.
In speed I, the pump is set to run on the minimum curve under all operating conditions.
See fig. 14.
CP2
III
II
Q
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