Button Locking; Alarm Functions; Service Alarm - Grundfos CU 301 Installation And Operating Instructions Manual

Indication of pressure setting
The system pressure set is indicated by a yellow
indicator light, which is permanently on.
Setting range: 40-100 psi.
Arrow-up button
When this button is pressed, the system pressure
setting is increased in steps of 10 psi.
Arrow-down button
When this button is pressed, the system pressure
setting is decreased in steps of 10 psi.

2.4 Button locking

The buttons on the CU 301 can be locked/unlocked
by pressing the two arrow buttons simultaneously for
5 seconds or via the R100 remote control.
Note: When the arrow buttons are used for locking,
take care not to inadvertently change the pressure
setting.
Use the following procedure:
1. Set the pressure one step up.
2. Press the arrow-down button as the first one
when pressing the two buttons.
PSI
100
90
80
70
60
50
40
Fig. 11 Button lock indication
When the buttons are locked, the indicator light is
permanently on, see fig. 11.
For further information, see section 5.3.8 Buttons on
the CU 301.
10

3. Alarm functions

The CU 301 continuously receives operating data
from the pump. The alarm functions indicated on the
CU 301 front are described in the following sections.

3.1 Service alarm

If one or more factory-set alarm values are
exceeded, the indicator light for service alarm is per-
manently on, see fig. 12.
Fig. 12 Service alarm indicator
Possible alarms:
• Sensor defective
• Overload
• Overtemperature
• Speed reduction
• Voltage alarm
• No contact to pump.
The possible alarms and how to identify them and
make the relevant corrections are described in sec-
tion 7.1 Service.
PSI
100
90
80
70
60
50
40