The Grundfos CU 321 is a constant pressure control system designed for use with 4″ larger Grundfos SP pumps and motors. This wall mounted system maintains a constant pressure within the maximum pump performance in spite of varying water consumption.
For 4″ or larger wells:
Domestic and light commercial water supply
Features & Benefits
Complete solution from one manufacturer
Easy setup: Simply select pump model and choose pressure setpoint
Four pump choices: Offered in most popular sizes, both 3 and 5 hp: 15, 25, 40 and 75 gpm
Matched pump and motor: 3 hp pump on 3 hp motor and 5 hp pump on 5 hp motor
Respects original operating designs; operates pump and motor within its designed rpm and hp ratings
Built-in protection features: soft-start, dry run, overload, over/under voltage, sensor alarm
Wide voltage range: 3 hp unit; single phase 208-240 VAC (+/- %) – 5 hp input; single or 3-phase 208-240 VAC (+/- %)
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Refer to Product Datasheets for Additional Technical Information