The Grundfos 35S20-8 CUE 100 package (93336417) brings together the main pumping and control components for a constant-pressure well water system. It pairs a 8-stage stainless steel SP pump end from the 35 GPM family with a 2 HP, 4-inch three-phase submersible motor and the CUE 100 20 variable-frequency drive.
The drive adjusts pump speed using pressure feedback to help maintain the selected water pressure as demand changes. The catalog lists this package for 230 V single-phase supply to the drive, with three-phase output to the motor. Consider this flow family for irrigation, agricultural water supply or building water service where the required flow and total dynamic head match the selected pump curve.
This 35 GPM pump end has 8 stages and makes a nominal 168 ft of head at rated flow at full speed. Grundfos does not publish an easy-selection chart for the 35 GPM range, so size this package from the SP pump curve on the Data Sheet tab against your pumping water level, the pressure you want and your piping losses. Because the CUE 100 varies pump speed to hold a constant pressure, the working duty point sits below the nominal head most of the time.
| Component | Description | Part No. |
|---|---|---|
| Pump end | Grundfos 35S20-8 SP 35 GPM, 8-stage, AISI 304 stainless steel | 98924022 |
| Motor | 2 HP, 4 in three-phase submersible | 96465630 |
| Drive | CUE 100 20 variable-frequency constant-pressure drive | 92939786 |
| Pressure transducer | Included with drive | – |
Order the complete package by its eight-digit order number in the Specifications section below. The component numbers are here so any one item can be identified or replaced later. A pressure tank, drop pipe, field cable and site fittings are additional.
| Specification | Value |
|---|---|
| Complete package order number | 93336417 |
| Pump model | 35S20-8 |
| Nominal flow family | 35 GPM |
| Pump stages | 8 |
| Motor power | 2 HP |
| Nominal head at rated flow | 168 ft |
| Minimum well size | 4 in |
| Discharge size | 1-1/2 in NPT |
| Drive supply | 230 V, single phase (1 Ph in) |
| Motor operation | Three phase (3 Ph out from the drive) |
| Drive enclosure | NEMA 4X / IP66, outdoor |
| Pressure transducer | Included with drive |
| Pump-end material | AISI 304 (EN 1.4301) stainless steel |
| Shipping weight | 73 lb (complete package) |
| Approvals | Pump end NSF/ANSI 61 MH26400 and NSF/ANSI 372. MS4000C motor IAPMO File 6591 |
The CUE 100 is set up at the drive keypad, or over Bluetooth with the free UnyConnect app on an iOS or Android phone. UnyConnect reads status and live operating data, sets the pressure setpoint and control parameters, and shows diagnostic alarms. Remote monitoring away from the wellhead requires the appropriate integration.
UnyConnect is a free app for the CUE 100 drive. Bluetooth must be enabled on the CUE 100 before pairing.
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