Brochure

Product range
MAGNA3
3
12
FLOW
ADAPT
The typical pump selection is based on required flow
and calculated pressure losses. Pumps are often
oversized.
To adjust for "oversized" pumps, valves are typically
used to increase the resistance and thus reduce the
flow. The FLOW
ADAPT
function reduces the need for a
pump throttling valve.
Note: This function cannot eliminate the need for
balancing valves in heating systems.
Fig. 9 Reduced need for a pump throttling valve
The FLOW
ADAPT
control mode combines a control
mode and a function:
• The pump is running AUTO
ADAPT
.
• The flow will never exceed a selected FLOW
LIMIT
value, which reduces the need for a pump throttling
valve connected in series with the pump.
Fig. 10 FLOW
ADAPT
control
When FLOW
ADAPT
is selected, the pump will run
AUTO
ADAPT
and ensure that the flow never exceeds
the entered FLOW
LIMIT
value.
The setting range for the FLOW
LIMIT
is 25 to 90 % of
the Q
max
of the pump.
The factory setting of the FLOW
LIMIT
is the flow where
the AUTO
ADAPT
factory setting meets the max. curve.
See fig. 10.
Note: Do not set the FLOW
LIMIT
lower than the
dimensioned duty point.
Proportional pressure
This control mode is used in systems with relatively
large pressure losses in the distribution pipes. The
head of the pump will increase proportionally to the
flow in the system to compensate for the large
pressure losses in the distribution pipes. The setpoint
can be set with an accuracy of 0.1 metre.
The head against a closed valve is half the setpoint
H
set
.
Fig. 11 Proportional-pressure control
Constant pressure
We recommend this control mode in systems with
relatively small pressure losses.
The pump head is kept constant, independent of the
flow in the system.
Fig. 12 Constant-pressure control
TM05 2685 1212TM05 3334 1312
H
Q
Q
max
90 %
H
auto_min
H
fac
Q
fac
Setting range
TM05 2448 1212TM05 2449 0312
H
Q
H
set
H
set
2
H
Q