Operating Functions; Operating Buttons And Indicator Lights - Grundfos CU 321 Notice D'installation Et D'entretien

2.3.6 Relay connection
Note: The cable jacket for the relay must cover the
first row of control card terminals. Maximum cable
diameter: 0-0.160 in (4 mm). See fig. 19.
Fig. 19 Relay connection terminals

3. Operating functions

3.1 Operating buttons and indicator lights

Install
Alarm
Off/
Reset
Fig. 20 Front view of the CU 321 control unit
CU321
Change/
Enter
Warning On
On
Operating buttons
Button Function
On
Enables the pump
Stops the pump and
Off/
Reset
resets warnings and alarms
Increases pump performance
Decreases pump performance
Install
Installation menu
Change/
Changes or enters data
Enter
Indicator lights
LED Function
Alarm (red) Indicates an alarm
Indicates that a warning level
Warning (yellow)
has been reached
Indicates that the mains supply
On (green)
has been switched on
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