Functions
MAGNA3
4
17
Operating modes
Normal
The pump runs according to the selected control
mode.
Note: You can select the control mode and setpoint
even if the pump is not running in Normal mode.
Stop
The pump stops.
Min.
You can use the minimum curve mode in periods
where a minimum flow rate is required.
This operating mode is for instance suitable for manual
night setback if automatic night setback is not desired.
Max.
You can use the maximum curve mode in periods
where a maximum flow rate is required.
This operating mode is for instance suitable for
hot-water priority.
You can select the normal, stop, min. and max.
operating modes directly by use of the built-in digital
inputs. See Connection to power supply,
terminal-connected versions, page 38.
Fig. 14 Maximum and minimum curves
Control modes
Factory setting
The pumps have been factory-set to AUTO
ADAPT
without automatic night setback, which is suitable for
most installations.
The setpoint has been factory-set. See Readings and
settings on the pump, page 25.
AUTO
ADAPT
We recommend the AUTO
ADAPT
control mode for most
heating systems, especially in systems with relatively
large pressure losses in the distribution pipes, and in
replacement situations where the
proportional-pressure duty point is unknown.
This control mode has been developed specifically for
heating systems and we do not recommend it for
air-conditioning and cooling systems.
Characteristics and key benefits
• Automatically adjusts the pump to actual system
characteristics.
• Ensures minimum energy consumption and a low
noise level.
• Reduced operating costs and increased comfort .
Technical specifications
Fig. 15 AUTO
ADAPT
control
The AUTO
ADAPT
control mode is a form of
proportional-pressure control where the control curves
have a fixed origin, H
auto_min
.
When you have enabled AUTO
ADAPT
, the pump will
start with the factory setting, H
fac
= H
set1
,
corresponding to approximately 55 % of its maximum
head, and then adjust its performance to A
1
. See fig.
15.
When the pump registers a lower head on the
maximum curve, A
2
, the AUTO
ADAPT
function
automatically selects a correspondingly lower control
curve, H
set2
. If the valves in the system close, the
pump adjusts its performance to A
3
. See fig. 15.
Note: Manual setting of the setpoint is not possible.
TM05 2446 5111
TM05 2452 1312
A
1
: Original duty point
A
2
: Lower registered head on the max. curve
A
3
: New duty point after AUTO
ADAPT
control
H
set1
: Original setpoint
H
set2
: New setpoint after AUTO
ADAPT
control
H
fac
: See page 25
H
auto_min
: A fixed value of 1.5 m
H
Q
H
auto_min
A
1
A
3
A
2
H
set1
H
set2
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