Control Functions - Grundfos MAGNA1 Installation And Operating Instructions Manual

7. Control functions

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Fig. 22 Selection of pump setting for system type
Factory setting: Intermediate proportional-pressure curve,
referred to as PP2.
Proportional-pressure curve (PP1, PP2 or PP3)
Proportional-pressure control adjusts the pump performance to
the actual heat demand in the system, but the pump performance
follows the selected performance curve, PP1, PP2 or PP3. See
fig. 23 where PP2 has been selected. For further information, see
section
8. Fault finding the product.
H
Fig. 23 Three proportional-pressure curves/settings
The selection of the right proportional-pressure setting depends
on the characteristics of the heating system in question and the
actual heat demand.
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Q
PP3
PP2
PP1
Q
Constant-pressure curve (CP1, CP2 or CP3)
Constant-pressure control adjusts the pump performance to the
actual heat demand in the system, but the pump performance
follows the selected performance curve, CP1, CP2 or CP3. See
fig. 24 where CP1 has been selected. For further information, see
section
8. Fault finding the product.
H
Fig. 24 Three constant-pressure curves/settings
The selection of the right constant-pressure setting depends on
the characteristics of the heating system in question and the
actual heat demand.
Constant curve (I, II or III)
At constant-curve operation, the pump runs at a constant speed,
independent of the actual flow demand in the system. The pump
performance follows the selected performance curve, I, II or III.
See fig. 25 where II has been selected. For further information,
see section
8. Fault finding the
H
Fig. 25 Three constant-curve settings
The selection of the right constant-curve setting depends on the
characteristics of the heating system in question.
CP3
CP2
CP1
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product.
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