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CONTENTS
Page
1. Constant-pressure control 3
1.1 Description 3
1.2 Function 3
1.3 System sizing 5
1.4 Positioning the pressure sensor 6
1.5 Precharge pressure setting 6
1.6 Pressure relief valve 6
2. Operating functions 7
2.1 On/off button 7
2.2 Indication of pump operation 7
2.3 Pressure setting 7
2.4 Button locking 8
3. Alarm functions 8
3.1 Service alarm 8
3.2 Dry-running protection 9
4. Position of LEDs and fuse 10
5. CU 301 with R100 11
5.1 Menu OPERATION 14
5.1.1 Pressure setting 14
5.1.2 Operating mode 14
5.1.3 Alarm 14
5.2 Menu STATUS 15
5.2.1 Operating mode 15
5.2.2 Actual pressure 15
5.2.3 Speed 15
5.2.4 Temperature 15
5.2.5 Power input and power consumption 15
5.2.6 Operating hours and number of starts 16
5.3 Menu INSTALLATION 16
5.3.1 Sensor 16
5.3.2 Choice of sensor 16
5.3.3 Maximum pressure setting 16
5.3.4 Automatic restart 17
5.3.5 Dry-running stop 17
5.3.6 Maximum speed 17
5.3.7 Buttons on CU 301 17
5.3.8 Indication of pump operation 18
5.3.9 Number 18
6. Fault finding 19
6.1 Service 19
7. Technical data 23
7.1 Electrical connection 24
7.1.1 Mains supply 25
7.1.2 Pump supply 25
7.1.3 Pressure sensor 25
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