Operating Modes; Control Modes - Grundfos MAGNA3 Manual

MAGNA3

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,
versions, page 38.
terminal-connected
H
Min.
Fig. 14 Maximum and minimum curves

Control modes

Factory setting
The pumps have been factory-set to AUTO
without automatic night setback, which is suitable for
most installations.
The setpoint has been factory-set. See
pump, page 25.
settings on the
Max.
Q
ADAPT
Readings and
AUTO
ADAPT
We recommend the AUTO
ADAPT
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
H
A
1
H
auto_min
A
3
Fig. 15 AUTO control
ADAPT
A : Original duty point
1
A : Lower registered head on the max. curve
2
A : New duty point after AUTO
3
H : Original setpoint
set1
H : New setpoint after AUTO
set2
H : See page 25
fac
H : A fixed value of 1.5 m
auto_min
The AUTO control mode is a form of
ADAPT
proportional-pressure control where the control curves
have a fixed origin, H
auto_min
When you have enabled AUTO
start with the factory setting, H
corresponding to approximately 55 % of its maximum
head, and then adjust its performance to A
15.
When the pump registers a lower head on the
maximum curve, A , the AUTO
2
automatically selects a correspondingly lower control
valve
curve, H . If the s in the system close, the
set2
pump adjusts its performance to A
Note: Manual setting of the setpoint is not possible.
control mode for most
H
set1
H
set2
A
2
Q
control
ADAPT
control
ADAPT
.
, the pump will
ADAPT
= H ,
fac set1
. See fig.
1
function
ADAPT
. See fig. 15.
3
4
17