Grundfos alpha2l, Installation And Operating Instructions Manual

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10. Pump settings and pump performance
Contents:
10.1 Relation between pump setting and pump performance .
10.1 Relation between pump setting and pump performance
Figure 13 shows the relation between pump setting and pump
performance by means of curves. See also 13. Performance curves .
Fig. 13 Pump setting in relation to pump performance
TM
04
25
32
26
08
III
II
I
AUTO
PP1
PP2
CP1
CP2
H
Q
ON
POWER
Setting Pump curve Function
PP1
Lowest
proportional-
pressure curve
The duty point of the pump will move up or down on the lowest
proportional-pressure curve, see fig.
13 , depending on the heating
demand.
The head (pressure) is reduced at falling heating demand and
increased at rising heating demand.
PP2
(factory
setting)
Highest
proportional-
pressure curve
The duty point of the pump will move up or down on the highest
proportional-pressure curve, see fig.
13 , depending on the heating
demand.
The head (pressure) is reduced at falling heating demand and
increased at rising heating demand.
CP1
Lowest
constant-
pressure curve
The duty point of the pump will move out or in on the lowest
constant-pressure curve, see fig.
13 , depending on the heating
demand in the system.
The head (pressure) is kept constant, irrespective of the heating
demand.
CP2
Highest
constant-
pressure curve
The duty point of the pump will move out or in on the highest
constant-pressure curve, see fig.
13 , depending on the heating
demand in the system.
The head (pressure) is kept constant, irrespective of the heating
demand.
III Speed III
ALPHA2 L runs at a constant speed and consequently on a
constant curve.
In speed III, the pump is set to run on the max. curve under all
operating conditions. See fig.
13 .
Quick venting of the pump can be obtained by setting the pump to
speed III for a short period. See
9.2 Venting the pump .