Grundfos MAGNA3 Installation And Operating Instructions Manual page 35

System application
In heating systems with a fixed system characteristic, for example domestic hot-water systems, the control of the
pump according to a constant return-pipe temperature may be relevant.
FLOW can be used with advantage to control the maximum circulation flow.
LIMIT
In a heating system where a constant temperature drop across the system is desired, constant differential
temperature can be used.
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.
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.
In systems with pumps operating in parallel.
The multi-pump function enables the control of single-head pumps connected in parallel (two pumps) and
twin-head pumps without the use of external controllers. The pumps in a multi-pump system communicate with
each other via the wireless GENIair connection.
Select this control
mode
Constant
temperature
H
Q
Differential
temperature
H
ΔT
Q
Constant curve
H
Q
"Assist" menu
"Multi-pump setup"
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