GRUNDFOS · VARIABLE-SPEED VERTICAL MULTISTAGE PUMP
CRE 1 — 1 1/4 in ANSI, 3600 rpm
Variable-speed vertical multistage centrifugal pump in cast iron and stainless steel with a Grundfos MLE motor and built-in frequency converter. 9 models from CRE 1-4 to CRE 1-27, 1/2 to 3 HP, 1 1/4 in ANSI ports, 3600 rpm version, with or without a factory pressure sensor.
116-799 ft (50-346 PSI) Max Head · 12.4-12.8 GPM Max
1/2-3 HP
200-240V 1Ph (1/2 to 2 HP) · 200-240V 3Ph · 440-480V 3Ph
1 1/4 in ANSI Ports
In-Line Suction and Discharge
Grundfos MLE Motor, Built-In Drive
Up to 3600 rpm
363 PSI Max Operating Pressure
NSF/ANSI 61
63-113 lb Weight
Overview
The CRE 1 is the CR 1 pump end on a Grundfos MLE motor with the frequency converter built in, so the pump varies its own speed to hold a setpoint instead of running flat out against a throttled valve. The pump head and base are cast iron; all other wetted parts are stainless steel (EN 1.4301, AISI 304). This listing is the 3600 rpm version with 1 1/4 in ANSI connections; Grundfos sells the 3600 rpm and 4000 rpm versions as separate part numbers with different curves, so each is listed on its own. The Grundfos nominal duty is 9.38 to 9.69 GPM by model at full speed; size it from the performance table below.
- 9 models, CRE 1-4 to CRE 1-27, 1/2 to 3 HP
- Supply: 200-240V 1Ph (1/2 to 2 HP), 200-240V 3Ph, 440-480V 3Ph
- Every model with or without a pressure sensor; sensor range 0-145 psi, 0-232 psi, 0-362 psi, 0-580 psi by model
- 1 1/4 in ANSI flanges
- MLE motor: IE5 efficiency class, IP55, speed range 360 rpm to rated speed, graphical control panel; HQQE (EPDM) cartridge shaft seal
What Ships and What It Needs to Run
Included: the CRE 1 pump end and its Grundfos MLE motor with built-in frequency converter, factory-assembled as one complete pump. With-sensor versions come with a pressure sensor in the range shown for the model.
ANSI companion flanges required, ordered separately. Grundfos supplies the companion connection as a separate flange set: two flanges, two gaskets, nuts and bolts, sized 1 1/4 in.
Without-sensor versions: for constant-pressure control, add a sensor or an external control signal.
Suction and discharge piping, valves, power supply and disconnect: sized to your system and ordered separately.
Genuine Grundfos equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.
Warranty: 24 months from date of installation, but not more than 30 months from date of manufacture (Grundfos limited warranty). Grundfos repairs or replaces its own product; costs of removal, installation and transportation are not covered, and products sold but not manufactured by Grundfos carry their own manufacturer’s warranty.
Specifications
| Specification |
Value |
| Nominal flow at full speed |
9.38 to 9.69 GPM by model (Grundfos nominal duty) |
| Shut-off head range at full speed |
116 to 799 ft (50 to 346 PSI) |
| Motor power range |
1/2 to 3 HP |
| Supply |
200-240V 1Ph (1/2 to 2 HP); 200-240V 3Ph; 440-480V 3Ph |
| Motor |
Grundfos MLE, permanent-magnet, built-in frequency converter, IE5, IP55 |
| Speed |
360 rpm to 3600 rpm (3600 rpm version) |
| NEMA frames |
56C, 182TC |
| Frequency |
60 Hz supply |
| Pressure sensor |
With-sensor versions: 0-145 psi, 0-232 psi, 0-362 psi, 0-580 psi by model; without-sensor versions have none |
| Suction and discharge ports |
1 1/4 in ANSI, in-line |
| Connections |
1 1/4 in ANSI flanges, 250 lb |
| Maximum operating pressure |
363 PSI |
| Shaft seal |
HQQE (EPDM), the Grundfos standard on these pumps |
| Liquid temperature |
−4 °F to 248 °F |
| Maximum ambient temperature |
122 °F |
| Pump orientation |
Vertical |
| Approvals |
NSF/ANSI 61 drinking water (Grundfos product data) |
Models & Performance — Will It Do What You Need?
Find the pressure you need at your flow and pick the first model that reaches it at full speed; the drive then slows the pump to hold your setpoint. Pressure at flow in PSI, one row per model and motor.
CRE 1-4 to CRE 1-27 · 12 curves
| Model (HP) |
0 GPM (Shut-off) |
2.4 GPM |
6 GPM |
9 GPM |
12 GPM |
| CRE 1-4 (1/2 HP) |
50 |
48 |
45 |
38 |
27 |
| CRE 1-6 (3/4 HP) |
75 |
73 |
67 |
57 |
40 |
| CRE 1-9 (1 HP, 1Ph) |
113 |
109 |
101 |
85 |
59 |
| CRE 1-9 (1 HP, 3Ph) |
115 |
112 |
105 |
89 |
63 |
| CRE 1-10 (1 1/2 HP) |
128 |
126 |
118 |
101 |
73 |
| CRE 1-13 (1 1/2 HP, 1Ph) |
164 |
159 |
146 |
123 |
85 |
| CRE 1-13 (1 1/2 HP, 3Ph) |
166 |
163 |
152 |
130 |
92 |
| CRE 1-15 (2 HP) |
193 |
189 |
177 |
151 |
108 |
| CRE 1-17 (2 HP, 1Ph) |
217 |
208 |
192 |
162 |
112 |
| CRE 1-17 (2 HP, 3Ph) |
218 |
214 |
199 |
170 |
121 |
| CRE 1-23 (3 HP) |
296 |
290 |
271 |
232 |
165 |
| CRE 1-27 (3 HP) |
346 |
339 |
315 |
269 |
186 |
Pressure the pump develops at full speed (3600 rpm version) at each flow, in PSI, rounded down (feet = PSI × 2.31). Shut-off is Grundfos’s published maximum head. Flow columns are read from the 100% speed curve on the Grundfos 60 Hz chart for each model and motor (water at 68 °F), digitized and rounded down, at 20%, 50% and 75% of 12 GPM, the last regular flow every curve in this listing reaches; the curves end at 12.4 to 12.8 GPM. At reduced speed the pump runs on a lower curve; full Grundfos charts with the reduced-speed curves are in the product images. Grundfos’s published duty point sits above its own curve by more than 3% of shut-off on CRE 1-17 (2 HP, 1Ph) (by up to 28 ft at the rated flow), where the motor’s power limit cuts the curve; the table follows the curve.
Before You Buy — The Limits That Decide the Fit
| Check |
What decides the fit |
| Duty point |
The model’s full-speed pressure at your flow must cover the system’s total head; shut-off is the most it can make, at zero flow. |
| Working pressure |
Inlet pressure plus the pressure the pump adds must stay within the maximum operating pressure: 363 PSI. |
| Sensor |
For constant-pressure control order the with-sensor version, and pick a sensor range above your setpoint; without-sensor versions need a sensor or external control signal for that. |
| Power |
Supply at the voltage and phase shown in the selected option; the drive is inside the motor, so no separate VFD is needed. |
| Connections |
ANSI companion flanges (1 1/4 in) ordered separately. |
| Liquid temperature |
−4 °F to 248 °F, HQQE (EPDM) shaft seal. |
Applications
Constant-pressure water supply and boosting, HVAC heating and cooling circulation, industrial water supply and transfer, process liquids, wash and clean, water treatment and irrigation (Grundfos CR range applications).
Materials of Construction
| Component |
Material |
| Pump head and base |
Cast iron, ASTM A48-35B |
| Other wetted parts |
Stainless steel EN 1.4301 (AISI 304) |
| Impellers |
Stainless steel |
| Bearings |
Silicon carbide |
| Shaft seal |
HQQE cartridge seal, silicon carbide faces, EPDM rubber |
