Brochure

Functions
MAGNA3
8
30
If the pump is installed in the return pipe of the system,
the internal temperature sensor can be used. In this
case, the pump must be installed as close as possible
to the consumer (radiator, heat exchanger, etc.).
Fig. 35 Pump with internal sensor
Constant curve
The pump can be set to operate according to a
constant curve, like an uncontrolled pump. See fig. 36.
The desired speed can be set in % of maximum speed
in the range from 25 to 100 %.
Fig. 36 Constant curve duty
Note: If the pump speed is set in the range between
minimum and maximum, the power and pressure are
limited when the pump is running on the max. curve.
This means that the maximum performance can be
achieved at a speed lower than 100 %. See fig. 37.
Fig. 37 Power and pressure limitations influencing the
max. curve
The pump can also be set to operate according to the
max. or min. curve, like an uncontrolled pump:
• 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 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.
These two operating modes can be selected via the
digital inputs.
Additional features for control
modes
The MAGNA3 offers additional features for the control
modes to meet specific demands.
FLOW
LIMIT
Fig. 38 FLOW
LIMIT
The setting range for the FLOW
LIMIT
is 0 to 90 % of the
Q
max
of the pump.
Note: Do not set the FLOW
LIMIT
lower than the
dimensioned duty point.
The FLOW
LIMIT
function offers the possibility of limiting
the maximum flow delivered by the pump.
The FLOW
LIMIT
function can be enabled when the
pump is in one of the following control modes:
• proportional pressure
• constant pressure
• constant temperature
• constant curve.
In the flow range between 0 and Q
max
, the pump will
run according to the selected control mode.
TM05 2616 0312TM05 2446 5111TM05 4266 2212
t
F
t
R
H
Q
H
Q
Min.
30%
50%
70%
90%
Limited max. curve
Speed setting from 0 to 100 %
TM05 2445 1312
H
Q
Q
max
Q
limit
90 %
Setting range