Overview Of Control Functions - Grundfos MAGNA1 Installation And Operating Instructions Manual

7.1 Overview of control functions

H
Fig. 26 Pump setting in relation to pump performance
Setting Pump curve
Lowest proportional-pressure
PP1
curve
Intermediate
PP2
proportional-pressure curve
Highest
PP3
proportional-pressure curve
Lowest constant-pressure
CP1
curve
Intermediate
CP2
constant-pressure curve
Highest constant-pressure
CP3
curve
III Speed III
II Speed II
I Speed I
I
Function
The duty point of the pump will move up or down on the lowest proportional-pressure curve,
depending on the heat demand. See fig. 26.
The head 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 intermediate proportional-pressure
curve, depending on the heat demand. See fig. 26.
The head 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. See fig. 26.
The head 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. 26.
The head is kept constant, irrespective of the heat demand.
The duty point of the pump will move out or in on the intermediate constant-pressure curve,
depending on the heat demand in the system. See fig. 26.
The head 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. 26.
The head is kept constant, irrespective of the heat demand.
The pump runs on a constant curve which means that it runs at a constant speed.
At speed III, the pump is set to run on the maximum curve under all operating conditions.
See fig. 26.
You obtain quick venting of the pump by setting the pump to speed III for a short period.
The pump runs on a constant curve which means that it runs at a constant speed.
At speed II, the pump is set to run on the intermediate curve under all operating conditions.
See fig. 26.
The pump runs on a constant curve which means that it runs at a constant speed.
At speed I, the pump is set to run on the minimum curve under all operating conditions. See
fig. 26.
PP3
CP3
PP2
CP2
PP1
CP1
III
II
Q
15