Brochure

Functions
MAGNA3
8
24
Selection of control mode
System application Select this control mode
Recommended for most heating systems, especially in systems with relatively large
pressure losses in the distribution pipes. See description under proportional
pressure.
In replacement situations where the proportional pressure duty point is unknown.
The duty point has to be within the AUTO
ADAPT
operating range. During operation,
the pump automatically makes the necessary adjustment to the actual system
characteristic.
This setting ensures minimum energy consumption and noise level from valves,
which reduces operating costs and increases comfort.
AUTO
ADAPT
The FLOW
ADAPT
control mode is a combination of AUTO
ADAPT
and FLOW
LIMIT
.
This control mode is suitable for systems where a maximum flow limit, FLOW
LIMIT
, is
desired. The pump continuously monitors and adjusts the flow, thus ensuring that the
selected FLOW
LIMIT
is not exceeded.
Main pumps in boiler applications where a steady flow through the boiler is required.
No extra energy is used for pumping too much liquid into the system.
In systems with mixing loops, the control mode can be used to control the flow in
each loop.
Benefits:
• The dimensioned flow for each zone (required heat energy) is determined by the
flow from the pump. This value can be set precisely in the FLOW
ADAPT
control
mode without the use of pump throttling valves.
• When the flow is set lower than the balancing valve setting, the pump will ramp
down instead of losing energy by pumping against a balancing valve.
• Cooling surfaces in air-conditioning systems can operate at high pressure and low
flow.
• Note: The pump cannot reduce the flow on the suction side, but is able to control
that the flow on the discharge side is at least the same as on the suction side. This
is due to the fact that the pump has no built-in valve.
FLOW
ADAPT
In systems with relatively large pressure losses in the distribution pipes and in
air-conditioning and cooling systems.
• Two-pipe heating systems with thermostatic valves and
– very long distribution pipes
– strongly throttled pipe balancing valves
– differential pressure regulators
– large pressure losses in those parts of the system through which the total
quantity of water flows (for example boiler, heat exchanger and distribution pipe
up to the first branching).
• Primary circuit pumps in systems with large pressure losses in the primary circuit.
• Air-conditioning systems with
– heat exchangers (fan coils)
– cooling ceilings
– cooling surfaces.
Proportional pressure
In systems with relatively small pressure losses in the distribution pipes.
• Two-pipe heating systems with thermostatic valves and
– dimensioned for natural circulation
– small pressure losses in those parts of the system through which the total
quantity of water flows (for example boiler, heat exchanger and distribution pipe
up to the first branching) or
– modified to a high differential temperature between flow pipe and return pipe
(for example district heating).
• Underfloor heating systems with thermostatic valves.
• One-pipe heating systems with thermostatic valves or pipe balancing valves.
• Primary circuit pumps in systems with small pressure losses in the primary circuit.
Constant pressure
H
Q
H
Q
Q
max
90 %
H
auto_min
H
fac
Q
fac
H
Q
H
set
H
set
2
H
Q