Grundfos MAGNA3 D Installation And Operating Instructions Manual page 22

Differential temperature
• This control mode ensures a constant differential temperature drop
across heating and cooling systems.
• The pump will maintain a constant differential temperature between
the pump and the external sensor.
Constant curve
• The pump can be set to operate according to a constant curve, like
an uncontrolled pump.
• Set the desired speed in % of the maximum speed in the range
from minimum to 100 %.
Multipump modes
• Alternating operation:
Only one pump is operating at a time.
• Backup operation:
One pump is operating continuously. In the event of a fault, the
backup pump starts automatically.
• Cascade operation:
The pump performance is automatically adapted to the
consumption by switching pumps on and off.
22
Δt
H
Q
H
Q
For further
information, see
section
8.3.7 Differential
temperature.
For further
information, see
section
8.3.8 Constant curve.
For further
information, see
section 8.5 Multipump
modes.