The CU331SP is a constant pressure, variable frequency drive based on a proven product platform. CU331SP is a strong supplement to the Grundfos SmartFlo constant pressure program. This new product is designed to easily adapt to any combination of 2HP, 3HP or 5HP Grundfos SP pump systems using a 3-phase motor. This wall mounted system maintains a constant pressure within the maximum pump performance in spite of varying water consumption. The CU331SP is programmed with parameter settings optimized for submersible pump applications. An easy to follow Start-Up Guide walks the installer through a few screens and completes the set-up.
For 4″ or larger wells: 2, 3 or 5HP pumps
Domestic and light commercial water supply
Features & Benefits
Easy setup – simply run the Start-up Wizard and choose pressure setpoint,
The system determines the direction of rotation and sets the dry-run function according to the pump,
System design approach – the CU331SP works with any combination of matched pump and motor,
CU331SP works with 2, 3 or 5Hp submersible pumps to fulfill your constant pressure requirements,
Matched pump & motor – 2HP pump on 2HP motor, 3HP pump on 3HP motor, 5HP pump on 5HP motor,
Built-in protection features – Soft start, dry run, overload, over/under voltage, sensor alarm, alarm relay and run relay,
Wide voltage range – input: single phase 208 – 240VAC output: 3-phase 208-240VAC,
Indoor or outdoor enclosure options: IP55/Type 12 or IP66/Type 4X.
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Refer to Product Datasheets for Additional Technical Information