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

2. Operating functions

2.1 On/Off button

PSI
100
90
80
70
60
50
40
On/Off button
Fig. 8
The green and red indicator lights in the On/Off but-
ton indicate pump operating condition as follows:
Indication Description
Green indicator light
The system is operational.
permanently on
Green indicator light The system is not opera-
off tional.
Red indicator light Pump has been stopped by
permanently on means of the On/Off button.*
Red indicator light The CU 301 is communicat-
flashing ing with the R100.
* 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.
IMPORTANT
Setting this button to the OFF position DOES
NOT remove power from the pump. Before ser-
vicing the pump, remove power at the service
breaker.

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.
Green indi-
cator light
Red indica-
tor light
The indication of pump operation can be changed by
means of the R100.
Possible settings:
• "Running light" during pump operation
• "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.
PSI
100
90
80
70
60
50
40
Indication of pump operation
Fig. 9
(factory setting).
PSI
100
90
80
70
60
50
40
Fig. 10 Pressure setting and indication
PSI
100
90
80
70
60
50
40
9