Grundfos MAGNA3 Installation And Operating Instructions Manual page 24

13.3.1 AUTO
ADAPT
The AUTO control mode continuously adapts the pump
ADAPT
performance according to the actual system characteristic.
Note
Note
Manual setting of the setpoint is not possible.
H
H
fac
A
1
H
auto_min
A
Fig. 21 AUTO
ADAPT
When the AUTO control mode has been enabled, the pump
ADAPT
will start with the factory setting, H
approx. 55 % of its maximum head, and then adjust its
performance to A . See fig. 21.
1
When the pump registers a lower head on the max. curve, A
AUTO function will automatically select a correspondingly
ADAPT
lower control curve, H . If the valves in the system close, the
set2
pump will adjust its performance to A
A : Original duty point.
1
A : Lower registered head on the max. curve.
2
A : New duty point after AUTO
3
H : Original setpoint setting.
set1
H : New setpoint after AUTO
set2
H : MAGNA3 xx-60: 11.4 ft (3.5 m)
fac.
MAGNA3 xx-80: 14.7 ft (4.5 m)
MAGNA3 xx-100: 18 ft (5.5 m)
MAGNA3 xx-120: 21.3 ft (6.5 m)
MAGNA3 xx-150: 26.2 ft (8.0 m)
MAGNA3 xx-180: 31.1 ft (9.5 m).
H : A fixed value of 4.9 ft (1.5 m).
auto_min
The AUTO control mode is a form of proportional-pressure
ADAPT
control where the control curves have a fixed origin, H
The AUTO control mode has been developed specifically
ADAPT
for heating systems and is not recommended for air-conditioning
and cooling systems.
To reset AUTO , see section 13.9.8
ADAPT
settings
.
24
H
set1
H
set2
A
3
2
Q
= H , corresponding to
fac set1
, the
2
.
3
control.
ADAPT
control.
ADAPT
.
auto_min
Return to factory
13.3.2 FLOW
ADAPT
When FLOW is selected, the pump will run AUTO
ADAPT
ensure that the flow never exceeds the entered FLOW
The setting range for the FLOW
the pump.
The factory setting of the FLOW
AUTO factory setting meets the max. curve. See fig. 22.
ADAPT
H
Setting range
H
fac
H
auto_min
Fig. 22 FLOW
ADAPT
13.3.3 Proportional pressure
The pump head is reduced at decreasing water demand and
increased at rising water demand. See fig. 23.
The setpoint can be set within the range from 1 meter (3.28 ft) to
approx. 1 meter (3.28 ft) below the maximum head, depending on
pump type.
H
H
set
H
set
2
Fig. 23 Proportional pressure
and
ADAPT
value.
LIMIT
is 25 to 90 % of the Q of
max
LIMIT
is the flow where the
LIMIT
90 % Q
max
Q
Q
fac
Q