Submittal Sheet

Functions
MAGNA3
4
21
Temperature sensor
To measure the temperature difference of the flow pipe
and the return pipe, you must use both the internal
sensor and an external sensor. If the pump is installed
in the flow pipe, the external sensor must be installed
in the return pipe and vice versa. Always install the
sensor as close as possible to the consumer (radiator,
heat exchanger, etc.). See fig. 24.
Fig. 24 Differential temperature
Constant flow
Note: Available for pumps with production code from
1838.
The pump maintains a constant flow in the system
independently of the head. See fig. 25.
Constant flow is suitable in applications such as air
handling units, hot-water systems and ground-source
heating systems.
Characteristics and key benefits
• It is not possible to use an external sensor, instead,
the pump uses its internal sensor.
• In multipump systems constant flow is only available
in alternating and backup operation, not cascade
operation.
Fig. 25 Constant flow rate
Constant curve
A constant curve is suitable for systems, where both a
constant flow rate and a constant head are required,
i.e.:
• Heat surfaces
• cooling surfaces
• heating systems with 3-way valves
• air condition system with 3-way-valve
• chiller pumps
Characteristics and key benefits
• If an external controller is installed, the pump is able
to change from one constant curve to another,
depending on the value of the external signal.
• Depending on your preferences, the pump can be
controlled according to either a maximum or
minimum curve.
Technical specifications
Fig. 26 Constant-curve duty
The pump can be set to operate according to a
constant curve, like an uncontrolled pump. See fig. 26.
TM05 8236 2113
TM05 7955 1713
t
H
Q
Q
set
TM05 2446 5111
H
Q