Operating Modes; Control Modes - Grundfos MAGNA3 D Installation And Operating Instructions Manual

8.2 Operating modes

Normal
The pump runs according to the selected control mode.
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 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.
You can use the maximum curve mode in periods in which a
maximum flow is required. This operating mode is for instance
suitable for hot-water priority.
H
Min.
Fig. 22 Maximum and minimum curves

8.3 Control modes

8.3.1 Factory setting
The pumps have been factory-set to AUTO
automatic night setback, which is suitable for most installations.
The setpoint has been factory-set. See section 8.6 Setting values
for control modes.
Max.
Q
without
ADAPT
8.3.2 AUTO
ADAPT
We recommend the AUTO
ADAPT
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
H
A
1
H
auto_min
A
3
Fig. 23 AUTO control
ADAPT
A : Original duty point.
1
A : Lower registered head on the maximum curve.
2
A : New duty point after AUTO
3
H : Original setpoint setting.
set1
H : New setpoint after AUTO
set2
H : See page 29.
fac
H : A fixed value of 1.5 m.
auto_min
The AUTO control mode is a form of proportional-pressure
ADAPT
control where the control curves have a fixed origin, H
When you have enabled AUTO
ADAPT
factory setting, H = H , corresponding to approx. 55 % of its
fac set1
maximum head, and then adjust its performance to A
23.
When the pump registers a lower head on the maximum curve,
A , the AUTO function automatically selects a
2
ADAPT
correspondingly lower control curve, H
system close, the pump adjusts its performance to A
23.
Manual setting of the setpoint is not possible.
control mode for most heating
H
set1
H
set2
A
2
Q
control.
ADAPT
control.
ADAPT
.
auto_min
, the pump will start with the
. See fig.
1
. If the valves in the
set2
. See fig.
3
23