Grundfos CU 321 User Manual

15
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
Fig. 20 Front view of the CU 321 control unit
Operating buttons
Indicator lights
TM03 2626 4605
TM03 2619 4605
Install
Enter
Alarm Warning On
Change/
Off/
Reset
On
CU321
Button Function
Enables the pump
Stops the pump and
resets warnings and alarms
Increases pump performance
Decreases pump performance
Installation menu
Changes or enters data
LED Function
Alarm (red) Indicates an alarm
Warning (yellow)
Indicates that a warning level
has been reached
On (green)
Indicates that the mains supply
has been switched on
On
Off/
Reset
Install
Enter
Change/

Grundfos CU 321 Specifications

General

Brand	Grundfos
Model	CU 321
Category	Control Unit
Language	English