Grundfos CRN 1S-3 — material number 99915666 — is a 3-stage Grundfos CRN vertical multistage centrifugal pump with a 1/3 HP, 3-phase, 208-230/460 V NEMA TEFC motor and a HQQE shaft seal.
This 3-stage configuration produces a moderate 105 ft of head at the BEP (4 GPM, ~45 psi) and is the most common choice for low-rise commercial boosting and short pipe runs where modest pressure is needed.
Specifications
| Model | CRN 1S-3 |
| Stages | 3 |
| Flow at BEP | 4 GPM |
| Head at BEP | 105 ft (~45 psi) |
| Shutoff head (approx.) | 126 ft |
| Motor | 1/3 HP, 3-phase, 208-230/460 V, NEMA TEFC on 56C frame |
| Shaft seal | HQQE (SiC/Carbon EPDM) |
| Materials | All AISI 316L stainless steel wetted parts |
| Material number (P/N) | 99915666 |
| Shipping weight | 57 lbs |
| Frequency | 60 Hz |
| Brand | Grundfos |
| Country of origin | Denmark / USA (varies by date code) |
Dimensions
| Approximate dimensions (vertical pump) | |
|---|---|
| Overall height (pump + motor) | 31.3 in |
| Pump body height (3 stages) | 19.3 in |
| Base height (stage 0) | 14.5 in |
| Added height per stage | 1.6 in |
| Motor frame | See spec table above |
| Mounting | Vertical foot-mounted |
| Motor orientation | Vertical with NEMA motor stool above pump head |
Note: Dimensions are approximate and based on the Grundfos CRN 1S data booklet. Exact dimensions vary slightly by motor frame and base style. For certified installation drawings of this specific material number, request a quote and we'll provide the official Grundfos dimensional drawing.
Pipe Connections
The Grundfos CRN 1S series is available with multiple connection types to match your installation requirements. Connection sizes for this series:
| Connection options | |
|---|---|
| Victaulic / PJE coupling | 1-1/4 inch PJE coupling (Victaulic-type) |
| ANSI flange size | 1-1/4 inch |
| ANSI flange class | 300 lb |
| Inlet / outlet orientation | Suction and discharge on the same horizontal centerline (in-line) |
Companion connections (gaskets, bolts, ANSI flanges or Victaulic couplings) are ordered separately. Contact ForeverPure for the matched connection kit part numbers for your specific configuration.
Available Configurations / Material Numbers
The CRN 1S-3 ships in several phase, voltage, and seal combinations. Material numbers for the most common variants:
| Phase / Voltage | Seal | Motor HP | Weight | Material Number |
|---|---|---|---|---|
| 1-phase, 115/230 | HQQE | 1/3 HP | 64 lbs | 99915588 |
| 3-phase, 208-230/460 | HQQE | 1/3 HP | 57 lbs | 99915666 |
| 1-phase, 115/230 | HQQV | 1/3 HP | 64 lbs | 99915607 |
| 3-phase, 208-230/460 | HQQV | 1/3 HP | 57 lbs | 99915686 |
| 1-phase, 115/230 | HQQE | 1/3 HP | 50 lbs | 99915546 |
| 3-phase, 208-230/460 | HQQE | 1/3 HP | 48 lbs | 99915626 |
| 1-phase, 115/230 | HQQV | 1/3 HP | 50 lbs | 99915567 |
| 3-phase, 208-230/460 | HQQV | 1/3 HP | 48 lbs | 99915646 |
Typical Applications
- Seawater reverse osmosis (SWRO) high-pressure feed
- Brackish water RO and booster
- Ultrapure water (UPW) for semiconductor fabs
- Pharmaceutical purified water (USP) loops
- Chloride-bearing chemical transfer
- Food-grade hot CIP
Datasheet & Documentation
- Grundfos CR/CRI/CRN North America Data Booklet (PDF)
- CR/CRI/CRN/CRT Installation & Operating Instructions (PDF)
- CR Service Manual (PDF)
Frequently Asked Questions
- What is the maximum head/flow of the Grundfos CRN 1S-3?
- The CRN 1S-3 produces approximately 105 ft of head at 4 GPM (best efficiency point), with a shutoff head of about 126 ft. That corresponds to roughly 45 psi at the BEP.
- What is the Grundfos CRN 1S-3 material number / part number?
- The primary material number for this configuration (3-phase 208-230/460, HQQE seal) is 99915666. Other voltage and seal options are listed in the variants table on this page.
- Which motor does the Grundfos CRN 1S-3 use?
- This SKU ships with a 1/3 HP, 3-phase, 208-230/460 V NEMA TEFC motor on a 56C frame. Other motor configurations and IE3/IE5 upgrades are available on request.
- Can the Grundfos CRN 1S-3 be paired with a variable frequency drive (VFD)?
- Yes. Order the matching E-Pump variant with integrated MLE permanent-magnet motor, or pair this fixed-speed pump with a Grundfos CUE external VFD.
- What is the typical lead time for the Grundfos CRN 1S-3?
- Many configurations of the CRN 1S series ship from stock through Grundfos USA. Contact ForeverPure Place for the current lead time on this specific material number (99915666).
Related Products
- Browse all Grundfos CRN 1S stage configurations
- All CR, CRI, CRN vertical multistage pumps
- Complete Grundfos catalog
