Operating Functions; On/Off Button; Indication Of Pump Operation; Pressure Setting - Grundfos CU 301 Installer Manual

2. Operating functions

2.1 On/off button

Fig. 8 shows the on/off button of the CU 301.
Fig. 8
bar
5.0
4.5
4.0
3.5
3.0
2.5
2.0
The green and red indicator lights in the on/off button
indicate pump operating condition as follows:
Indication
Green indicator light
permanently on.
Green indicator light
off.
Red indicator light
permanently on.
Red indicator light
flashing.
* If the on/off button has been used to stop the
pump, this button must also be used for restarting.
Any alarm indication can be reset by pressing the
on/off button.
If the on/off button is pressed for more than 5 sec-
onds, the pump is started, irrespective of any active
fault/alarm indications and sensor signals.
When the on/off button is released, the pump will
stop, if the alarm still exists.
Zielona dioda
Green indi-
cator light
Red indicator
light
Czerwona dioda
Description
The system is operational.
The system is not opera-
tional.
Pump has been stopped by
means of the on/off button.*
The CU 301 is communicat-
ing with the R100.

2.2 Indication of pump operation

On the graphical illustration on the CU 301 front, the
riser pipe shows running light when the pump is
operating. When the pump is not operating, none of
the indicator lights are on, see fig. 9.
Fig. 9
bar
5.0
4.5
4.0
3.5
3.0
2.5
2.0
The indication of pump operation can be changed by
means of the R100.
Possible settings:
• "Running light" during pump operation (factory
setting).
• "Constant light" during pump operation.

2.3 Pressure setting

The two arrow buttons on the CU 301 front are used
for the pressure setting, see fig. 10.
Fig. 10
bar
5.0
4.5
4.0
3.5
3.0
2.5
2.0
bar
5.0
4.5
4.0
3.5
3.0
2.5
2.0
7