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Product range
MAGNA3
3
11
Operating modes
Fig. 7 Max. or min. curves
Normal: The pump runs according to the selected
control mode.
Note: The control mode and setpoint can be selected
even if the pump is not running in "Normal" mode.
Stop: The pump stops.
Min.: The min. curve mode can be used in periods in
which a minimum flow is required.
This operating mode is for instance suitable for manual
night setback if Automatic Night Setback is not
desired.
Max.: The max. curve mode can be used in periods in
which a maximum flow is required.
This operating mode is for instance suitable for
hot-water priority.
The operating modes can be selected directly by use
of the built-in digital inputs. See section Digital inputs,
page 28.
Control modes
Factory setting
The pumps have been factory-set to AUTO
ADAPT
without Automatic Night Setback.
The setpoint has been factory-set to half of the
maximum pump head.
The factory setting is suitable for most installations.
AUTO
ADAPT
Recommended for most heating systems.
During operation, the pump automatically makes the
necessary adjustment to the actual system
characteristic.
This setting ensures minimum energy consumption
and noise level from valves, which reduces operating
costs and increases comfort.
Fig. 8 AUTO
ADAPT
control
Note: Manual setting of the setpoint is not possible.
When the AUTO
ADAPT
control mode has been
enabled, the pump will start with the factory setting,
H
fac
= H
set1
, corresponding to approx. 55 % of its
maximum head, and then adjust its performance to A
1
.
See fig. 8.
When the pump registers a lower head on the max.
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
.
The AUTO
ADAPT
control mode is a form of
proportional-pressure control where the control curves
have a fixed origin, H
auto_min
.
The AUTO
ADAPT
control mode has been developed
specifically for heating systems and is not
recommended for air-conditioning and cooling
systems.
TM05 2446 5111
H
Q
Max.
Min.
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 setting.
H
set2
: New setpoint after AUTO
ADAPT
control.
H
fac
: See section Setting values for control
modes (Single-head operation), page 15.
H
auto_min
: A fixed value of 1.5 m.
H
Q
H
auto_min
H
fac
A
1
A
3
A
2
H
set1
H
set2